Warranty Registration Card must be filled out by the customer and mailed within thirty (30) days of installa-
tion in order to gain warranty coverage.
When receiving the Delta Performance appliance, any claims for damage or shortage in shipment must be
filed immediately against the transportation company by the consignee.
Leave all documentation received with appliance with owner for future reference.
WARNING
* I N S
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NOTICE
2005-44 Manual Modulating Delta
If the information in this manual is not followed exactly, a fire or explosion may
result causing property damage, personal injury or death.
FOR
YOUR SAFETY
• Do not store or use gasoline or other flammable vapors and liquids in the vicinity of
this or any other appliance.
• WHAT TO DO IF YOU SMELL GAS
- Do not try to light any appliance
- Do not touch any electrical switch; do not use any phone in your building.
- Immediately call your gas supplier from a neighbor’s phone. Follow the gas
supplier’s instructions.
- If you cannot reach your gas supplier, call the fire department.
Installation and service must be performed by a qualified installer, service agency or the
gas supplier.
Modulating Gas Fired
Combination Heaters
The
Modulating
Modulating
Date: 5/2/06
The MODULATING DELTA must be vented and supplied with combustion
and ventilation air as detailed in the MODULATING DELTA Vent
Supplement, which is included in the installation envelope. Once installation is
completed, inspect the vent and combustion air system thoroughly to ensure
systems are leak free, tight and comply with the instructions given in the
MODULATING DELTA Vent Supplement and are within all requirements of
applicable codes. Failure to comply with the installation requirements on the
venting and combustion air piping and ventilation will cause severe personal
injury or death.
DANGER
Table of Contents
i
PRODUCT AND SAFETY INFORMATION
Definitions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Product Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Operating Restrictions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Code Restrictions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
SECTION I - PRE-INSTALLATION ITEMS
Code Compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Determining Product Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Replacement of Existing Boiler/Water Heater . . . . . . . . . . . . . . . . . . . . . . . 5
Recommended Clearances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-6
Flooring and Foundation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Residential Garage Installations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Freeze Protection Feature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
SECTION II - APPLIANCE PREPARATION
Handling Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
SECTION III - DOMESTIC PIPING
General Piping Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Domestic Supply Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Thermal Expansion. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Water Hammer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Temperature / Pressure Relief Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-9
Thermostatic Mixing Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Mixing Valve Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Domestic Cold Water Supply Piping Assembly Installation . . . . . . . . . . . . 9
U-Tube Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-10
Domestic Drain Valve. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Multiple Appliances Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Storage Tank Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
TR/Smart Series Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Domestic Piping Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-13
Table of Contents
ii
SECTION IV - PRIMARY PIPING
General Piping Requirements
Pressure Relief Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Low Water Cut-off Device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Additional Limit Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14-15
Backflow Preventer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Primary System Piping Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Expansion Tank and Makeup Water . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Diaphragm (Bladder) Expansion Tank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Closed-Type (Standard) Expansion Tank . . . . . . . . . . . . . . . . . . . . . . . . . . . 15-16
Circulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Sizing Primary Piping. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
System Piping - Zone Circulators. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
System Piping - Zone Valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
System Piping - Radiant Heating with Mixing Valves. . . . . . . . . . . . . . . . . 16-17
System Piping - Multiple Appliances Installation . . . . . . . . . . . . . . . . . . . . 17
Primary Piping Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18-21
SECTION V - GAS PIPING
Gas Supply Piping Connection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Natural Gas
Pipe Sizing -Natural Gas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Natural Gas Supply Pressure Requirements. . . . . . . . . . . . . . . . . . . 23
Propane Gas
Pipe Sizing - Propane Gas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Propane Gas Supply Pressure Requirements . . . . . . . . . . . . . . . . . . 24
SECTION VI - INTERNAL WIRING
General Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
SECTION VII - EXTERNAL WIRING
Installation Compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Line Voltage Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Thermostat Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Outdoor Reset Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Additional 24V Limit Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
System Circulator - Zone Valve Applications . . . . . . . . . . . . . . . . . . . . . . . 28
External Control Wiring Diagrams. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28-31
iii
Table of Contents
SECTION VIII - START-UP PREPARATION
Check System and Domestic Water Chemistry
Water pH Level 6.0 to 8.0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Water Hardness Less Than 7 Grains. . . . . . . . . . . . . . . . . . . . . . . . . 32
Chloride Concentration Less Than 80 mg/L . . . . . . . . . . . . . . . . . . 32
Chlorinated Water . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Flush Primary and Domestic System to Remove Sediment. . . . . . . . . . . . . 32
Check and Test Antifreeze . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32-33
Use of Antifreeze in the Primary System . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Filling the Inner (Domestic) Tank and System . . . . . . . . . . . . . . . . . . . . . . 33
Filling the Outer (Primary) Tank and System . . . . . . . . . . . . . . . . . . . . . . . 33-34
Check for Gas Leaks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Check Thermostat Circuit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
SECTION IX - START-UP PROCEDURES
Final Checks Before Start-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Appliance Start-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
If Appliance Does Not Start Correctly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Check the Appliance and System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35-36
Start-Up / Operating Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Set Domestic DHW Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Operation Verification - Domestic Hot Water . . . . . . . . . . . . . . . . . . . . . . . 38-39
Set Primary CH Target Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Operation Verification - Space Heating . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39-40
Control Display. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Standby Mode Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40-42
Setting the Control Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Accessing Control Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Error (Hard Lockout) Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Setting the Thermostatic Mixing Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
SECTION X - CHECK-OUT PROCEDURES
Check-out Procedures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
SECTION XI - INSTALLATION RECORD
Installation Record . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
iv
Table of Contents
SECTIONS XII - MAINTENANCE SCHEDULE
Service Technician - General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Owner Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
SECTION XIII - MAINTENANCE PROCEDURES
Maintenance Procedures
Reported Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Check Surrounding Area. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Inspect Burner Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Check System (Primary and Domestic) Piping . . . . . . . . . . . . . . . . 49
Check Combustion/Ventilation Air Openings . . . . . . . . . . . . . . . . . 50
Inspect Vent System and Combustion Air Piping . . . . . . . . . . . . . . 50
Check Primary System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Check Domestic System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Check Expansion Tank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Check Primary Relief Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Check Temperature / Pressure Relief Valve . . . . . . . . . . . . . . . . . . . 51
Inspection of Ignition Electrode . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Check All Gaskets. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Check Control Wiring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Check Parameter Limit Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Perform Start-Up and Checkout Procedure . . . . . . . . . . . . . . . . . . . 51
Check Burner Flame . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Check Flame Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Check Combustion Levels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Review with Owner . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Handling Previously Fired Combustion Chamber Insulation . . . . . 53
REPLACEMENT PARTS
Replacement Parts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54-55
PRODUCT SPECIFICATIONS
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56-57
Product & Safety Information
1
Indicates the presence of a hazardous
situation which, if ignored, will result in
death, serious injury or substantial
property damage.
Indicates a potentially hazardous situa-
tion which, if ignored, can result in
death, serious injury or substantial
property damage.
Indicates a potentially hazardous situa-
tion which, if ignored, may result in
minor injury or property damage.
Indicates special instructions on installa-
tion, operation or maintenance, which
are important to equipment but not
related to personal injury hazards.
Indicates recommendations made by
Triangle Tube for the installers which
will help to ensure optimum operation
and longevity of the equipment
BEST PRACTICES
NOTICE
CAUTION
WARNING
DANGER
The following terms are used throughout this manual to bring attention to the presence of
potential hazards or to important information concerning the product.
Triangle Tube reserves the right to modify the technical specifications and components of
its products without prior notice.
NOTICE
2
Product & Safety Information
Do not use this appliance if any part
has been under water. Immediately call
a qualified service technician to inspect
the appliance and to replace any part of
the control system which has been
under water.
WHAT TO DO IF YOU SMELL GAS
- Do not try to light any appliance
- Do not touch any electrical switch; do
not use any phone in your building.
- Immediately call your gas supplier
from a neighbor’s phone. Follow the
gas supplier’s instructions.
- If you cannot reach your gas suppli-
er, call the fire department.
Installation and service must be per-
formed by a qualified installer, service
agency or the gas supplier.
Should overheating occur or the gas
supply fails to shut off, turn OFF the
manual gas control valve external to
the appliance.
To prevent damage to inner tank,
installer must:
• Fill inner tank prior to outer tank
during start-up.
• Relieve primary system pressure
below 15 psig prior to draining
inner tank.
CAUTION
WARNING
DANGER
DANGER
Qualified Installer:
Prior to installing this product read all
instructions included in this manual.
Perform all installation steps required in this
manual in the proper order given. Failure to
adhere to the guidelines within this manual
can result in severe personal injury, death or
substantial property damage.
Homeowner:
-This product should be maintained / ser-
viced and inspected annually by a qual-
ified Service Technician.
- This manual is intended for use by a
qualified Installer/Service Technician.
Please reference the appliance’s model
number and the serial number from the
rating label when inquiring about ser-
vice or troubleshooting.
Triangle Tube accepts no liability for any
damage resulting from incorrect instal-
lation or from the use of components or
fittings not specified by Triangle Tube.
NOTICE
NOTICEWARNING
Product & Safety Information
3
Bacteria can develop in the domestic
water system if certain minimum water
temperatures are not maintained.
Water temperature over 125ºF can cause
severe burns instantly or death from
scalds.
• Children, disabled and elderly are at
highest risk of being scalded.
- Never leave them unattended in or
near shower, bathtub or sink.
- Never allow small children to use a
hot water faucet or draw their own
bath.
• If any one using hot water in the building
fits the above description or codes
require specific water temperatures at hot
water faucet, we recommend:
a) ensure the factory equipped thermo-
static mixing valve is installed and
working properly.
b)to set the thermostatic mixing valve
for the lowest temperature which sat-
isfies your hot water need.
.
Protection must be taken against excessive
temperature and pressure!
TO PROTECT AGAINST EXCESSIVE
TEMPERATURE AND PRESSURE
• Check if the Temperature and
Pressure (T&P) relief valve is in the
location provided. (Domestic Water)
• Check if the 30 psi relief valve sup-
plied is in the location provided.
(Primary water)
• To avoid injury, install the relief
devices to comply with local code
requirements.
CAUTION
DANGER
WARNING
4
Product & Safety Information
OPERATING RESTRICTIONS
• Maximum working pressure for inner
(domestic water) tank is 150 psig.
• Maximum working pressure for outer
(primary water) tank is 45 psig.
• Inner tank has factory installed
Temperature & Pressure Relief Valve
with an AGA rating of 200,000 Btu/hr.
• Outer tank has a factory installed 30
psig relief valve rated at 535,000
Btu/hr
• Electrical rating:120 V, 60 Hz, less
than 12 amperes
• pH & chloride limits for the MODU-
LATING DELTA are:
- Chloride, less than 80 mg/l.
- pH, 6.0 - 8.0.
• 186º F Maximum operating tempera
-
ture - primary side.
• 120º F Maximum outlet temperature
from mixing valve - domestic side.
Any water conditioning system must be
installed and maintained in accordance
with manufacturer
’s specifications.
CODE RESTRICTIONS
Single wall heat exchanger in the MODU-
LATING DELTA complies with National
Standard Plumbing Code, provided that:
- Outer tank water (including additives)
is practically non-toxic, having toxici-
ty rating or Class of 1, as listed in
Clinical Toxicology of Commercial
Products,
- Outer tank pressure is limited to max-
imum 30 psig by approved relief
valve.
Single wall heat exchangers are permitted
under the Uniform Plumbing code - Paragraph
L3.2. if they satisfy all of the following
requirements.
1. The heat transfer medium is potable
water or contains only substances
which are recognized as safe by the
U.S. Food and Drug Administration.
2. The pressure of the heat transfer medium
is maintained less than the normal mini-
mum operating pressure of the potable
water system
3. The equipment is permanently labeled
to indicate that only additives recog-
nized as safe by the FDA shall be used
in the heat transfer medium.
Or, per Uniform Plumbing Code paragraph
L3.3 as follows:
Other heat exchanger designs may be permitted
where approved by the Administrative Authority.
NOTICE
Pre-Installation Items
5
SECTION I - Pre-Installation Items
Code Compliance
This product must be installed in accor-
dance to the following:
• All applicable local, state, national and
provincial codes, ordinances, regula-
tions and laws.
• The National Fuel Gas Code NFPA 54/
ANSI Z223.1 - Latest edition.
• National Electric Code ANSI/NFPA 70.
• For installations in Canada -“Installation
Code for Gas Burning Equipment” CSA
B149 and CSA C22.1, Canadian
Electrical Code.
Determining Product Location
Before locating the MODULATING DELTA
check for convenient locations to:
- Domestic water supply piping
- Heating system piping
- Venting
- Gas supply piping
- Electrical service
Ensure the area chosen for the installation of
the MODULA
TING DELTA is free of any
combustible materials, gasoline and other
flammable liquids.
Failure to remove or maintain the area
free of combustible materials, gasoline
and other flammable liquids or vapors
can result in severe personal injury,
death or substantial property damage.
Ensure the MODULATING DELTA and its
controls are protected from dripping or spray-
ing water during normal operation or service.
The MODULATING DELTA should be
installed in a location so that any water
leaking from the tank or piping connections
or relief valves will not cause damage to
the area surrounding the appliance or any
lower floors in the structure.
- When such a location is unavoidable, a
suitable drain pan with adequate
drainage should be placed under the
appliance. The drain pan must not
restrict the flow of combustion air to
the appliance.
Replacement of Existing Boiler/Water
Heater
If the MODULATING DELTA is replacing an
existing boiler / hot water heater system, the
following items should be checked and correct-
ed prior to installation:
• Primary and domestic piping leaks and
corrosion.
• Improper location and sizing of the
expansion tank on the primary heating
loop.
• Improper sizing of the thermal expan-
sion tank (if used) on the domestic sup-
ply line.
• Vent condition and sizing.
Recommended Clearances
The MODULATING DELTA is approved for
zero clearance to combustibles, excluding the
vent hood and vent piping.
Vent hood and vent piping - 2 inches from
combustible materials unless otherwise stated
by the vent pipe manufacturer.
Primary and domestic hot water piping - 1 inch
from combustible material.
WARNING
Pre-Installation Items
To provide serviceability to the appli-
ance it is suggested that the following
clearances be maintained:
Top and vent hood area - 36 inches.
Front and burner area - 24 inches.
Rear and primary piping areas - 12
inches.
When installing the MODULATING
DELTA in a confined space, sufficient air
must be provided for proper combustion
and venting and to allow under normal
operating condition proper air flow
around the product to maintain ambient
temperatures within safe limits to com-
ply with the National Fuel Gas Code
NFPA 54 - latest edition.
Flooring and Foundation
The MODULATING DELTA is approved for
installation on combustible floors, but never on
carpeting.
Do not install the MODULATING
DEL
TA on carpeting even with a metal
or wood foundation base. Fire can result
causing severe personal injury, death or
substantial property damage.
Installer should provide a solid brick or con-
crete foundation pad, at least 2 inches above
the floor level if:
- There is a potential for the floor to
become flooded.
The height of the
foundation should be such to sufficient-
ly elevate the appliance.
- The floor is dirt, sand, gravel or other
loose material.
- The flooring is severely uneven or
sloped.
The minimum foundation size required is 24
inches x 23 inches.
Residential Garage Installations
When installing the MODULATING DELTA in
a residential garage the following special pre-
cautions per NFPA 54/ANSI Z223.1 must be
taken:
- Mount the appliance with a minimum
18 inches above the floor level of the
garage. Ensure the burner and ignition
devices / controls are no less than 18
inches above the floor level.
- Locate or protect the appliance in a
matter so it cannot be damaged by a
moving vehicle.
Freeze Protection Feature
The control has an freeze protection feature built
in. This feature monitors the supply temperature
and responds as follows when no call for heat is
present:
- 45ºF CH circulator is ON
- 37ºF CH circulator is ON and burner
operates at low fire.
- 50ºF Burner OFF and CH circulator
operates for approximately 10 minutes
The freeze protection feature is disabled
during a hard lockout. If the heating sys-
tem is left unattended in cold weather,
appropriate safeguards or alarms should
be installed to prevent property damage.
An optional control/interface is available
from Triangle Tube which will provide a
set of alarm contacts which will close
during a hard lockout.
WARNING
WARNING
WARNING
BEST PRACTICES
6
Appliance Preparation
7
SECTION II - Appliance Preparation
Handling Instructions
The MODULATING DELTA is generally easi-
er to handle and maneuver once removed from
the shipping carton and pallet.
To remove the shipping carton and pallet:
a. Remove the shipping straps and open
the top of the carton to remove the
wood shipment insert.
b. Lift the carton over the appliance to
remove. If ceiling height is limited, the
carton maybe cut open using care not to
damage the exterior jacket of the appli-
ance.
c. Remove the front burner hood to pre-
vent damage prior to lifting the appli-
ance from the shipping pallet.
When lifting or moving the appliance do
not use the burner or its components as a
means of a handle. Hand-truck the
appliance from the rear only.
d. Discard all packing materials.
WARNING
8
Domestic Piping
SECTION III - Domestic Piping
General Piping Requirements
• All plumbing must meet or exceed all
local, state and national plumbing codes.
• Use pipe dope or tape suitable for
potable water.
• Use isolation valves to isolate system
components.
• Install unions for easy removal of the
MODULATING DELTA from the sys-
tem piping.
Domestic Supply Pressure
For applications in which the domestic sup-
ply pressure exceeds
70 psig it is recom-
mended to install a pressure reducing valve
on the cold water supply.
Maintaining the cold water supply at or
below
70 psig will prevent normal thermal
expansion from repeatedly forcing the T&P
relief valve open.
Thermal Expansion
If the cold water supply to the domestic
inner tank contains a backflow preventer,
check valve and / or a pressure reducing
valve, the installer must install a domestic
thermal expansion tank on the cold water
supply. (See Fig. 2 page 11)
Installing a thermal expansion tank will
prevent normal thermal expansion from
repeatedly forcing the T&P relief valve
open.
When installing a thermal expansion tank
ensure the charge pressure of the tank is
equal to the cold water supply pressure at
the point of installation. Consult the ther-
mal expansion tank manufacturer’s instruc-
tions for further information on installation
and sizing.
The Temperature / Pressure relief valve
is not intended for constant duty, such as
relief of pressure due to normal thermal
expansion.
Water Hammer
Water hammer is the effect of sudden pres-
sure changes occurring in the domestic pip-
ing. These pressure changes are typically
the result of “fast acting” positive shut-off
valves closing. These types of valves can
be typically found on dishwashers and
clothes washers.
The effects of water hammering can cause
damage to system components and tank
welds on the appliance.
Installation of hammer arresters is recom-
mended at these types of appliances, which
incorporate “fast-acting” positive shut-off
valves. Consult the manufacturer of water
hammer arresters for recommendation on
sizing and installation requirements.
Temperature / Pressure Relief Valve
The MODULATING DELTA has a factory
installed Temperature / Pressure Relief
valve.
The installer must install discharge piping onto
the T&P relief valve. The discharge piping
must be:
• Made of material serviceable for tem-
peratures of 250ºF or greater.
• Directed so that any hot water dis-
charge flows away from all persons.
• Directed to a suitable place of drainage.
• Installed as to allow complete draining
of the T&P relief valve and the dis-
charge piping.
• Terminated with a plain end, not with
threads.
CAUTION
9
Domestic Piping
Failure to properly direct the discharge
piping of the T&P relief valve may result
in flooding of the area adjacent to the
appliance and/or lower floors in the
structure causing substantial property
damage.
The installer must not install the T&P
relief valve discharge piping in a manner
that is:
• Excessively long: Using more than 2
elbows and/or 15 feet of discharge pip-
ing can reduce the discharge capacity.
• Terminated directly into a drain: The
discharge piping must terminate within
6 inches of the drain. Check with local
plumbing codes for termination guide-
lines.
• The discharge piping is plugged, reduced
in size or restricted in any manner.
• The discharge piping is subject to
freezing.
DO NOT install any valves between the
T&P relief valve and the discharge pip-
ing. DO NOT plug the T&P relief valve
or the discharge piping. Improper place-
ment and piping of the T&P relief valve
can cause severe personal injury, death
or substantial property damage.
Thermostatic Mixing Valve
The MODULATING DELTA contains a facto-
ry equipped thermostatic mixing valve with
built-in check valve. The operating range of the
thermostatic mixing is 90ºF to 120ºF.
For applications with a domestic recirculation
loop, the recirculation pump should be con-
trolled by an aquastat. The maximum recom-
mended setting of the aquastat is 10ºF lower
than the thermostatic mixing valve setting.
For proper operation of the thermostatic
mixing valve and to prevent potential
scalding hazards, the recirculation loop
should be controlled by an aquastat. DO
NOT use continuous recirculation or
timers.
Mixing Valve Installation
1. Remove the jacket top panel by pushing up
on the corners.
2. Remove the mixing valve from the carton
located inside the front control cover.
3. Apply pipe dope to the male threads locat-
ed on the “H” (hot) side of the mixing valve
and the internal threads of the domestic hot
water supply tee.
4. Thread the “H” side of the mixing valve in
to the domestic hot water supply tee, align
valve and tighten using two wrenches to
avoid pipe damage.
Domestic Cold Water Supply Piping
Assembly Installation
1. Locate the domestic cold water supply pip-
ing assembly at the top of the appliance.
2. Apply pipe dope to the male threads of the
domestic cold water supply piping assembly
and the internal threads of the cold water
supply tee.
3. Thread the domestic cold water supply pip-
ing assembly in to the domestic cold water
supply tee, align the branch with the
domestic system piping and tighten using
two wrenches to avoid pipe damage.
U-Tube Assembly
The MODULATING DELTA is supplied
with a U-Tube Assembly that directs cold
water to the thermostatic mixing valve.
To install the U-Tube Assembly the
installer must:
DANGER
WARNING
CAUTION
10
Domestic Piping
1. Disconnect the cold inlet adapter/union
from the thermostatic mixing valve.
2. Use needle-nose pliers to remove the
plastic check valve assembly from the
adapter.
3. Solder the U-Tube Assembly onto the
adapter. See Fig. 1.
4. Once the adapter has sufficiently
cooled, re-insert the check valve assem-
bly making sure of orientation and
reconnect onto the mixing valve.
5. Solder the remaining end of the U-tube
to the adapter on the cold inlet piping
If the installation requires domestic hot
water for a commercial dishwasher, the
installer may insert a tee connection
between the appliance and the mixing
valve to provide high temperature domestic
hot water. The installer must reference
local plumbing codes to ensure if this type
of application is permissible.
The thermostatic mixing valve MUST be
installed and utilized on the MODU-
LATING DELTA. Removal of the ther-
mostatic mixing valve will result in
severe personal injury or death.
The manual valve on the U-Tube assem-
bly must remain in the full open position
for proper operation of the thermostatic
mixing valve.
Domestic Drain Valve
- The installer must install a drain valve
and drain leg as shown in Fig. 2 page 11.
- The drain valve should be positioned
close to the floor to aid in the siphon
action required to drain the inner tank.
Multiple Appliances Installation
For applications using multiple appliances the
domestic piping should be piped using a bal-
anced manifold arrangement.
The installer should remove the thermostatic
mixing valve from the appliances and install a
single thermostatic mixing valve at the outlet
of the hot water manifold. The thermostatic
mixing valve should be sized according to the
required flow rate and pressure drop. Refer to
the thermostat mixing valve manufacturer
specification and installation instructions for
more details. Reference Fig. 4, page 12 for pip-
ing diagram.
Storage Tank Application
For applications requiring large volumes of
domestic hot water in a relative short period,
the installer may include a storage type tank
(see Fig. 5 page 13) in the domestic piping.
The installer must:
1. Relocate the thermostatic mixing valve
from the MODULATING DELTA to
the outlet of the storage tank.
2. Provide recirculation from the storage
tank back to the MODULATING
DELTA using a bronze type circulator.
Recommended flow rate is 5 to 10 gpm
maximum.
Recirculation from the storage tank can
be accomplished through the drain
connection if a 3rd tapping is unavail-
able on the storage tank. The recircula-
tion circulator must be controlled by an
aquastat.
NOTE
CAUTION
DANGER
C
o
l
d
H
o
t
U-Tube Assembly
Adapter
Check Valve
Mixed
Fig. 1: Mixing Valve Assembly
11
Domestic Piping
Optional
12" Heat trap
8
1
To dishwasher if
permitted by codes
3
Cold water
inlet
4
3
3
6
9
U-Tube assembly
Fig. 2: MODULATING DELTA
Without Recirculation
Note: All shut off valves shown in
this figure must be shut when siphon
draining the MODULATING
DELTA
Domestic Piping Diagrams
1. Mixing valve with check valve
3. Shut off valve
4. Backflow preventer or pressure reducing valve*
6. Thermal expansion tank*
8. Domestic drain valve
9. Vacuum breaker*
* Optional devices may be required by local codes or installation requirements
SMART Series Application
For applications requiring large volumes of
domestic hot water over an extended period,
the installer may include a Triangle Tube
SMART Indirect Water Heater in conjunction
with the MODULATING DELTA. (See Fig. 6
page 13)
The domestic system recirculation, if used, is
directed to the SMART Series Tank. The circu-
lator should be controlled by an aquastat.
The primary piping to the SMART Series tank
must comply with the piping methods detailed
in SECTION IV - Primary Piping or with other
recognized piping methods.
Additional information regarding domestic and
primary piping can be found in the SMART
Installation Manual.
12
Domestic Piping
7
8
1
1
0
T
o dishwasher if
permitted by codes
2
3
U-Tube
assembly
O
ptional Recirculation Line
3
O
ptional
12" Heat trap
Cold water
inlet
4
3
3
6
9
Fig. 3: MODULATING DEL
TA
With Recirculation
1.
Mixing valve with check valve
2. Flow check valve
3. Shut off valve
4.
Backflow preventer or pressure reducing valve*
6. Thermal expansion tank*
7.
Circulator (controlled by aquastat)
8. Domestic drain valve
9. Vacuum breaker*
10. Recirculation
Aquastat
Note: All shut off valves
shown in this figure must be
closed when siphon draining
the MODULATING DELTA
* Optional devices may be required by local codes or installation requirements
Optional
12" Heat trap
8
1
To dishwasher if
permitted by codes
3*
Cold water
inlet
4
3
3
6
9
U
assembly
7
2
3
Optional Recirculation Line
10
Fig. 4:
Multiple MODULA
TING DEL
T
AS Installation
W
ith Recir
culation
13
Domestic Piping
11
Optional
12" Heat trap
Optional recirculation line
8
11
1
10
8
3
Cold water
inlet
4
3
3
3
6
9
2
7
2
7A
To dishwasher if
permitted by codes
Optional
12" Heat trap
8
1
3
Cold water
inlet
4
3
3
3
6
9
2
7
10
To dishwasher if
permitted by codes
Optional recirculation line
Fig. 6:
MODULA
TING DEL
T
A
with SMAR
T
Indir
ect
Water Heater
Fig. 5 : MODULATING DELTA with Storage Tank
1. Mixing valve with check valve
2. Flow check valve
3. Shut off valve
4. Backflow preventer or pressure reducing valve*
6. Thermal expansion tank*
7/7A. Circulator (controlled by aquastat)
8. Domestic drain valve
9. Vacuum breaker*
10. Recirculation aquastat
11. Tank aquastat
* Optional devices may be required by local codes or installation requirements
14
Primary Piping
SECTION IV - Primary Piping
General Piping Requirements
- All plumbing must meet or exceed all local,
state and national plumbing codes.
- Support all piping using hangers. DO NOT
support piping by the appliance or its com-
ponents.
- Use isolation valves to isolate system com-
ponents.
- Install unions for easy removal of the MOD-
ULATING DELTA from the system piping.
Pressure Relief Valve
1. The MODULATING DELTA is supplied
with a 30 psi pressure relief valve.
2. To avoid potential water damage to the sur-
rounding area or potential scalding hazard
due to the operation of the relief valve, the
discharge piping:
- Must be connected to the discharge out-
let of the relief valve and directed to a
safe place of disposal.
- Length should be as short and direct as
possible. The size of the discharge line
should not be reduced; maintain the
same size as the outlet of the relief valve.
- Should be directed downward towards
the floor at all times. The piping should
terminate at least 6 inches above any
drain connection to allow clear visibili-
ty of the discharge.
- Should terminate with a plain end, not
with a threaded end. The material of
the piping should have a serviceable
temperature rating of 250ºF or greater.
- Should not be subject to conditions
where freezing could occur.
- Should not contain any shut-off valves
or obstructions. No shut-off valve
should be piped between the appliance
and the relief valve.
Failure to comply with the guidelines on
installing the pressure relief valve and
discharge piping can result in personal
injury, death or substantial property
damage.
Low Water Cutoff Device
- The MODULATING DELTA is
equipped with a factory installed pres-
sure switch style Low Water Cut Off
device.
- The minimum operating system pres-
sure allowable with this device is 10
psig.
- Check local codes which require a low
water cutoff device for compliance of
this device.
Additional Limit Control
If a LWCO device is required by certain local
jurisdictions, the following guidelines must be
followed:
- The LWCO device must be designed
for water installations, electrode probe-
type is recommended.
- The LWCO device must be installed in
a tee connection on the supply or return
piping above the appliance.
- Wiring of the LWCO device to the
MODULATING DELTA is done direct-
ly onto the 24V terminal strip, refer-
ence Fig. 13 page 26 for available ter-
minals for an external limit (manual or
auto reset).
If an additional high temperature limit is
required by local code requirements the limit
should be installed as follows:
- Install the limit in the appliance supply
piping between the appliance and any
isolation valve.
WARNING
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