Johnson Controls DSH048C Installation, Operation & Maintenance Instructions Manual

DSH048C
Johnson Controls
Brand
Johnson Controls
Model
DSH048C
Category
Split-system air conditioners
Type
Installation, Operation & Maintenance Instructions Manual

This manual is also suitable for

MODEL DSH024C–060C AND 096B–120B
HORIZONTAL R-410A
STYLE B/C
Issue Date:
August 30, 2018
AIR-COOLED SELF-CONTAINED UNITS
INSTALLATION, OPERATION, MAINTENANCE
Supersedes: 145.32-IOM4 (1216) Form 145.32-IOM4 (818)
FORM 145.32-IOM4 (818)
2
IMPORTANT!
READ BEFORE PROCEEDING!
GENERAL SAFETY GUIDLINES
This equipment is a relatively complicated apparatus.
During installation, operation, maintenance or service,
individuals may be exposed to certain components or
conditions including, but not limited to: refrigerants
, oils,
materials under pressure, rotating components, and
both high and low voltage. Each of these items has the
potential, if misused or handled improperly, to cause
bodily injury or death. It is the obligation and respon-
sibilty of operating/service personnel to identify and
recognize these inherent hazards, protect themselves,
and proceed safely in completing their tasks. Failure to
comply with any of these requirements could result in
serious damage to the equipment and the property in
which it is situated, as well as sever personal injury or
death to themselves and people at the site.
This document is intended for use by owner-authorized
operating/service personnel. It is expected that this
individual possesses independent training that will en-
able them to perform their assigned tasks properly and
safely. It is essential that, prior to performing any task
on this equipment, this individual shall have read and
understood this document and any referenced materials.
This individual shall also be familiar with and comply with
all applicable governmental standards and regulations
pertaining to the task in question.
SAFETY SYMBOLS
The following symbols are used in this document to alert the reader to areas of potential hazard.
DANGER indicates an imminently haz-
ardous situation which, if not avoided,
will result in death or serious injury.
WARNING indicates a potentially haz-
ardous situation which, if not avoided,
could result in death or serious injury.
CAUTION identifies a hazard which could
lead to damage to the machine, damage
to other equipment and/or environmental
pollution. Usually and instruction will be
given, together with a brief explanation.
NOTE is used to highlight additional in-
formation which may be helpful to you.
All wiring must be in accordance with published specifications and must be performed ONLY by
qualified service personnel. The manufacturer will not be responsible for damages/problems
resulting from improper connections to the controls or application of improper control signals.
Failure to follow this will void the manufacturer’s warranty and cause serious damage to prop-
erty or injury to persons.
WARNING: This product can expose you to chemicals including formaldehyde, which is known
to the state of California to cause cancer. For more information, go to www.P65Warnings.ca.gov.
FORM 145.32-IOM4 (818)
CHANGEABILITY OF THIS DOCUMENT
In complying with Johnson Controls policy for continu-
ous product improvement, the information contained in
this document is subject to change without notice. While
Johnson Controls makes no commitment to up-date or
provide current information automatically to the manual
owner, that information, if applicable, can be obtained
by contacting the nearest Johnson Controls service
office.
It is the responsibility of operating/service personnel as
to the applicability of these documents to the equipment
in question. If there is any question in the mind of
operating/service personnel as to the applicability of
these documents, then, prior to working on the
equipment, they should verify with the owner whether
the equipment has been modified and if current
literature is available.
TABLE OF CONTENTS
Safety Symbols………………………………………………………… 2
Changeability of This Document…………………………………….. 3
Typical Installation Diagrams……..……………………………..…… 4
General Information..………………………………………………….. 7
Installation –
Pre-Installation Inspection of Equipment…………………………. 7
Rigging…………………………………………………………….... 7
Installation Site……………………………………………………… 7
Cabinet Configurations/Unit Mounting……………………………. 8
Separation of Units (Evaporator / Condenser)………………….. 8
Physical Data…..………………………………………………………. 11
Service Clearances and Corner Weights…………………………….15
Interconnecting Refrigerant Tubing…….....………………………….18
Outdoor Air Ductwork………………………………………………….18
Louver Sizing Guidelines…………………………………………..18
Electrical Wiring………………………………..……………………… 19
Typical Wiring Schematics………………………………...………20
Nameplate Electrical Data………………………………………... 23
Fan Performance Data……………………………………………….. 24
Motor and Drive Data……………………………………………… 27
Blower RPM Adjustment………………………………………….. 28
Low Ambient Operation / Damper Kit Installation…………………. 29
Start-Up and Operation………………………………………………. 30
Refrigerant Charges………………………………………………. 30
Pressure Switch Settings…………………………………………. 30
Microprocessor Controller……………………………………....…… 31
Operation……………………………….………………………….. 31
Safety Switches……….…………………………………………… 31
Safety Controls…………………...........………………………….. 31
Microprocessor Flash Codes…………………………………….. 33
Maintenance/Service………………………………………………… 34
Filters………………..……………………………………………… 34
Evaporator and Condenser Coils………………………............. 34
Refrigerant Circuits………………………………………………... 34
Blowers………………………………………………………………34
Drive Belts………………………………………………………….. 34
R-410A Service Procedures - Quick Reference Guide…………… 35
3
FORM 145.32-IOM4 (818)
4
FORM 145.32-IOM4 (818)
5
DSH024C-DSH060C – SINGLE COMPRESSOR UNIT – TYPICAL INSTALLATION DIAGRAM
FORM 145.32-IOM4 (818)
6
DSH096B/120B – DUAL COMPRESSOR UNIT – TYPICAL INSTALLATION DIAGRAM
FORM 145.32-IOM4 (818)
7
NOMENCLATURE TABLE
FORM 145.32-IOM4 (818)
8
GENERAL INFORMATION
Models 2 to 8 tons can be ordered as packaged,
factory-charged unitized packages or as factory split.
The 10 ton model comes factory-split. See ‘Cabinet
Configuration Options’ for more information.
Units can be turned on their side for short periods of
time, which allows passage through standard door
sizes. All unit components are securely mounted inside
the heavy gauge galvanized steel cabinet. All units are
lined with 1/2" thick - 2 lb density acoustical insulation
to ensure the quietest operation. All models are
provided with medium-efficiency 2" thick throwaway
filters rated MERV 7.
All units 2 to 5 tons utilize a single scroll compressor.
The 8 and 10 ton model is a dual scroll compressor unit
with two independent refrigerant circuits. All units come
standard with a microprocessor control board (refer to
‘Microprocessor’ section).
Units will operate reliably at outdoor ambient down to
50F. In applications requiring operation below this
temperature, a low ambient damper accessory is
available. The damper installs on the condenser air
intake, and allows operation to 0 F ambient.
ONLY QUALIFIED PERSONNEL SHOULD
PERFORM INSTALLATION AND SERVICE
OF THIS EQUIPMENT.
PRE-INSTALLATION INSPECTION OF EQUIPMENT
All units are factory tested to ensure safe operation and
quality assembly. Units are packaged and sealed on
shipping skids and shipped in first class condition. Torn
and broken packaging, scratched or dented panels
should be reported to carrier immediately. Internal
inspection of all units should be performed prior to
installation. Remove all access doors and check for
visual defects that can occur during transport. Any
problems found internally should be reported to carrier
and manufacturer immediately. Refrigerant circuit
should be checked to ensure no leaks have occurred
during shipment. Install gauge set to high and low
pressure ports to confirm pressure has been
maintained and no leaks have occurred during
shipment. Repair any damage prior to installation to
ensure safe operation.
RECORD ANY UNIT DAMAGE ON THE
BILL OF LADING AND REPORT TO
CARRIER AND FACTORY IMMEDIATELY.
SHIPPING AND HANDLING DAMAGES
ARE NOT WARRANTY ITEMS.
RIGGING
PRIOR TO MOUNTING UNIT, CHECK
INDIVIDUAL UNIT WEIGHTS (PAGE 10)
AND VERIFY LIFTING CAPACITY OF
LIFTING EQUIPMENT EXCEEDS WEIGHT
OF UNITS BY SAFE MARGINS. FAILURE
TO DO SO MAY RESULT IN UNIT
DAMAGE, PERSONAL INJURY OR EVEN
DEATH.
To ensure safe installation of the unit when ceiling
mount application is specified, estimate the
approximate center of gravity of the unit. The
configuration of internal components for each unit is
different and weight is unevenly distributed.
DETERMINE THE ACTUAL CENTER OF
GRAVITY OF THE UNIT BY PERFORM-
ING A TEST LIFT. LIFTING AN UNBAL-
ANCED UNIT CAN CAUSE PERSONAL
INJURY OR EVEN DEATH.
INSTALLATION SITE
LOCK ALL ELECTRICAL POWER SUP-
PLY SWITCHES IN THE OFF POSITION
BEFORE INSTALLING THE UNIT. FAIL-
URE TO DISCONNECT POWER SUPPLY
MAY RESULT IN ELECTRICAL SHOCK OR
EVEN DEATH.
Location - To ensure unit operates at maximum
efficiencies, choose a dry indoor area where the
temperature is controlled between 50F and 115F.
Consideration of surrounding areas should be taken
when choosing a location to install the unit. Common
vibration and sound levels associated with commercial
equipment may be objectionable to people or
equipment.
FAILURE TO ALLOW ADEQUATE SPACE
BETWEEN UNITS MAY RESULT IN POOR
UNIT PERFORMANCE AND POSSIBLE
UNIT FAILURE.
Install thermostats, air supplies and returns so that each
unit will operate only on individual unit control. To
assure fast drainage of condensate run-off, unit can be
slightly pitched in the same direction as drain pan outlet.
FORM 145.32-IOM4 (818)
9
CABINET CONFIGURATION OPTIONS
Horizontal unit consists of an evaporator and condenser
module. It is recommended to order the units in the
appropriate configuration minimize installation costs
and delays on site. Units 2 to 8 tons can be ordered
from the factory as either packaged or split. The 10 ton
unit only comes factory split. The following cabinet
configurations are possible (see ‘Nomenclature Table’
for other available options):
P – (2 to 8 ton models only) Unit comes assembled as
a packaged unit and factory-charged with R-410A.
Ideal for installations where unit will be installed as a
packaged system – no separation is required while
moving equipment into position or during installation.
S – Unit is factory-split and factory-charged with R-
410A. Unit comes with refrigerant shut-off/coupling
valves that hold charge in both condenser and
evaporator sections. Ideal for installations where unit
will be installed as a packaged system and separation
of evaporator and condenser is required during
installation to move equipment through tight spaces
(hallways, elevators, etc.). Both evaporator and
condenser sections contain R-410A refrigerant.
N – Unit is factory-split with a Nitrogen holding charge
only. No refrigerant shut-off/coupling valves are
included. For installations where unit will be installed
as a split system. Separate condenser and evaporator
sections facilitate moving equipment into position.
UNIT MOUNTING
Flanges for all duct connections, corner securing
brackets, and refrigerant tubing couplings (‘S’ cabinet
configurations only) are shipped in the condensing
section of the unit for field installation. Duct flanges for
evaporator return are incorporated into the filter rack.
Remove shipping securing straps and brackets from
refrigerant piping and couplings before assembling and
piping the units, see pictures below (8 & 10 ton model
shown).
Units may be either hung, or floor mounted. If unit is to
be hung, use all mounting points indicated – regardless
if unit is installed as a package or split system (refer to
typical installation diagram on Page 4-5). Use of
minimum ½ in. dia. hanger rods is strongly
recommended. Ensure the attachment point of the rods
to the building structure is sufficient to support the unit
weight. In order to ensure efficient condensate
drainage, the unit may be pitched towards the
evaporator end of the unit.
A minimum of 4-in. clearance is required under the unit
to allow for trapping of the evaporator condensate drain.
See ‘Typical Service Clearances’ section for more unit
clearance information.
DSH Operating Weight (Lbs)
Unit
Operating
Weight
(Condenser
Only)
Shipping Weight
(Condenser Only)
DSH024C
675 (390)
715 (430)
DSH036C
680 (400)
720 (440)
DSH048C
955 (568)
1015 (608)
DSH060C
995 (593)
1065 (633)
DSH096B
1470 (815)
1560 (855)
DSH120B
1800 (1020)
1870 (1060)
SEPARATION OF UNITS
All models can be ordered with refrigerant shut-off
valves/couplings to allow the evaporator and condenser
sections to be shipped factory-split for assembly on site
without the necessity of reclaiming the entire unit
refrigerant charge. The 2 to 5 ton models are available
with shut-off valves. The 8 and 10 ton models are
available with self-sealing brass refrigerant couplings. A
Field Split Coupling Kit is available for field split
applications of the 8 and 10 ton models ordered with
couplings.
Self-Sealing Refrigerant Couplings
The male coupling is fastened to the condenser wall via
a mounting bracket. The 8 ton unit when ordered as a
single packaged unit can be field split. To separate the
couplings, you must use a back up wrench on the
female coupling to avoid stressing the refrigerant piping
(see picture below showing a packaged unit with
couplings).
FORM 145.32-IOM4 (818)
10
Once the couplings are unscrewed the female coupling
can be pulled away and allowed to rest in the opening.
No loss of refrigerant will occur due to the spring-seal
mechanism in the couplings.
The evaporator and condenser sections may be
separated by performing the following procedures.
These procedures are for the 2 to 8 ton capacities only.
On the 8 ton model unscrew all four couplings (pictured
above) with the aid of a back-up wrench to separate the
unit:
1) (2 – 5 ton models) Close all refrigerant isolation
valves, on both suction and liquid and hot gas
bypass (if applicable) line. Valves are not a
back-seating design. Caps are wrench tight.
Remove caps and turn stem clockwise to seat
in the closed position.
2) (2 to 5 ton models) Use the valve access ports
to reclaim the refrigerant trapped in the lines
between the pairs of shut-off valves.
Use a TUBING CUTTER ONLY - do not use
hacksaws to cut refrigerant tubing
otherwise serious damage can occur to
refrigeration system!
3) (2 – 5 ton models) Cut the refrigerant line
sections between the pairs of shut-off valves. It
is recommended to make this out where
accessibility is greatest - in the condensing
section of the unit. This will allow best access
for reconnection, or attachment of an extended
line set in the case of a split system.
4) Remove the interconnecting wiring between
the evaporator and condenser electrical panel.
Disconnect the wire terminations in the
condenser electrical panel, and pull the excess
wire into the evaporator panel.
5) Remove the threaded wire bushing connecting
the two electrical panels
6) Remove the unit top-joining strip; Take care to
remove only those screws which attach the
joining strip to the evaporator and condenser
cabinets.
7) Remove the two side cross-member angles.
8) Carefully pull the evaporator section away from
the condenser section. Take care not to
damage the short lengths of refrigerant tubing
extending into the condenser section.
The separated evaporator and condenser modules may
now be individually moved to the desired location for re-
assembly, or separately located for split applications.
Splitting units with couplings will require a mating
coupling kit. See table below. For split installations, the
cross member angles will need to be field cut for each
section length and re-attached.
FIELD SPLIT COUPLING KITS
Model No.
Part No.
DSH096B*M*P / DSH096B*M*S
DSH096B-SPLIT-KIT
DSH096B*M*P / DSH096B*M*S
DSH096B-SPLIT-HGBP
w/ Hot Gas Bypass
DSH120B*M*S
DSH120B-SPLIT-KIT
DSH120B*M*S w/ Hot Gas Bypass
DSH120B-SPLIT-HGBP
The couplings must be protected for any
foreign material, dust or debris if they are
left uncapped for any extended period of
time.
When brazing couplings ensure the following is
adhered to:
1) When applying paste flux to copper tube, avoid
applying excessive amounts to avoid flux
running inside coupling where it can cause
corrosion and damage.
2) The coupling should be immersed in cold water
bath, ensuring the diaphragm (threaded) is fully
immersed
3) Double tipped torches are recommended to
reduce brazing time. After brazing quench the
couplings to reduce the temperature.
When assembling the couplings ensure the following:
FORM 145.32-IOM4 (818)
11
1) R-410A refrigerant oil is applied to entire
diaphragm surface, o-ring, and threaded male
coupling end.
2) Coupling halves must be held in proper
alignment with each other prior to starting the
threads of the female coupling nut onto the
male half. Thread by hand the first 3 rotations
of the union nut. If nut does not start by hand,
adjust position of the line set or if necessary
position of unit module.
3) Using a back-up wrench tighten the female
union nut until a definite increase in resistance
is felt. At this point most of threads will have
been covered by the nut. Ensure that the
female and male bodies during any portion of
the wrench installation do not rotate.
4) Make note of the location of the female nut to
the bulkhead. Using a marker or scribe to mark
a line lengthwise. Then finally tighten an
additional one wrench flat or 60
o
. This final
tightening is necessary to ensure a proper leak
proof seal between the couplings.
FORM 145.32-IOM4 (818)
12
DSH024C & DSH036C DIMENSIONAL DATA
EVAPORATOR OPENINGS
CONDENSER OPENINGS
EVAPORATOR
SECTION
CONDENSER
SECTION
RETURN
AIR
CONDENSER
INTAKE
CONDENSER
DISCHARGE
SUPPLY
AIR
16.00
13.25
25.63
23.13
23.75
26.00
38.00 C.C.29.00 C.C.
58.50 C.C.
61.00
OPTIONAL RETURN AIR
(FIELD CONVERTIBLE)
OPTIONAL CONDENSER INTAKE
(FIELD CONVERTIBLE)
3/4" NPT DRAIN
CONNECTION
2-3 TON HORIZONTAL A/C UNIT
DIMENSIONAL DATA
EVAPORATOR SECTION
ELECTRICAL BOX ACCESS
EVAPORATOR
FAN ACCESS
CONDENSER
FAN ACCESS
LOW VOLTAGE CONNECTION
23.75
7.18
7.00
56.00
71.88 C.C.
78.19
2.70
2.75
FRONT
BACK
FRONT
ELECTRICAL POWER CONNECTION
CONDENSER SECTION
ELECTRICAL BOX ACCESS
COMPRESSOR
ACCESS
EVAPORATOR
ACCESS
2.38
1.00
NOTE: DIMENSION TOLERANCE IS 1/16"
27.50
4.75
17.50
7.75
14.00
6.57
FORM 145.32-IOM4 (818)
13
DSH048C & DSH060C DIMENSIONAL DATA
NOTE: DIMENSION TOLERANCE IS 1/16"
4-5 TON HORIZONTAL A/C UNIT
DIMENSIONAL DATA
SUPPLY
AIR
RETURN
AIR
OPTIONAL RETURN AIR
(FIELD CONVERTIBLE)
OPTIONAL CONDENSER INTAKE
(FIELD CONVERTIBLE)
CONDENSER
INTAKE
CONDENSER
DISCHARGE
CONDENSER
SECTION
EVAPORATOR
SECTION
35.62 C.C.
40.00 C.C.
80.50 C.C.
66.50 C.C.
69.10
86.19
ELECTRICAL POWER CONNECTION
CONDENSER SECTION
ELECTRICAL BOX ACCESS
EVAPORATOR SECTION
ELECTRICAL BOX ACCESS
LOW VOLTAGE CONNECTION
CONDENSER OPENINGS
EVAPORATOR OPENINGS
FRONT
FRONT
17.50
18.50
15.00
16.00
10.12
9.73
8.13
8.75
CONDENSER
FAN ACCESS
EVAPORATOR
FAN ACCESS
28.00
26.75
29.38
23.13
COMPRESSOR
ACCESS
EVAPORATOR
ACCESS
4.75
BACK
4.25
3.00
1.00
2.38
64.00
3/4" NPT DRAIN
CONNECTION
27.50
30.50
FORM 145.32-IOM4 (818)
14
DSH096B DIMENSIONAL DATA
FORM 145.32-IOM4 (818)
15
DSH120B DIMENSIONAL DATA
FRONT VIEW
BACK VIEW
RIGHT VIEW
LEFT VIEW
CONDENSER
DISCHARGE
CONDENSER
INTAKE
RETURN
AIR
SUPPLY
AIR
10 TON HORIZONTAL A/C UNIT
DIMENSIONAL DATA
EVAPORATOR
SECTION
CONDENSER
SECTION
60.88
55.00 C.C. 65.00 C.C.
86.50
60.88
4.70
70.88
11.31
84.00
1
1.25
CONDENSER SECTION
ELECTRICAL BOX ACCESS
EVAPORATOR SECTION
ELECTRICAL BOX ACCESS
EVAPORATOR
BLOWER DRIVE
ACCESS PANEL
FILTER ACCESS
(BOTH SIDES)
CONDENSER
BLOWER DRIVE
ACCESS PANEL
COMPRESSOR
ACCESS PANEL
CONDENSER DISCHARGE
61.00
29.35
33.25
4.94
2.5
38.10
30.10
1.58
1.25
2.20
11.26
41.79
3/4" NPT DRAIN
CONNECTION
EVAPORATOR DISCHARGE
2.94
TOP VIEW
TX VALVE & FILTER DRIER
ACCESS PANEL
1.08
20.52
21.27
70.88
18.44
POWER
CONNECTION
EVAPORATOR INTAKE
CONDENSER INTAKE
48.20
SERVICE
HOSE ACCESS
SIGHT GLASS
VIEW ACCESS
89.10
FORM 145.32-IOM4 (818)
16
TYPICAL SERVICE CLEARANCES
2-5 TON HORIZONTAL A/C UNIT
SERVICE CLEARANCES
SUPPLY
AIR
RETURN
AIR
CONDENSER
INTAKE
CONDENSER
DISCHARGE
CONDENSER
SECTION
EVAPORATOR
SECTION
FRONT
CONDENSER
FAN ACCESS
EVAPORATOR
FAN ACCESS
36 IN. MINIMUM CLEARANCE
36 IN. MINIMUM CLEARANCE
4 IN. MINIMUM CLEARANCE
(FOR DRAIN TRAP)
FORM 145.32-IOM4 (818)
17
8 & 10 TON HORIZONTAL A/C UNIT
SERVICE CLEARANCES (8 TON PACKAGED UNIT SHOWN)
CONDENSER
INTAKE
RETURN
AIR
SUPPLY
AIR
8 TON HORIZONTAL A/C UNIT
SERVICE CLEARANCES
EVAPORATOR
SECTION
CONDENSER
SECTION
EVAPORATOR
SECTION
CONDENSER
SECTION
TOP VIEW
4 IN. MINIMUM CLEARANCE
(FOR DRAIN TRAP)
36 IN. MINIMUM
CLEARANCE
36 IN. MINIMUM
CLEARANCE
36 IN. MINIMUM
CLEARANCE
BACK VIEW
FORM 145.32-IOM4 (818)
18
UNIT CORNER WEIGHTS
FORM 145.32-IOM4 (818)
19
INTERCONNECTING REFRIGERANT TUBING
After the evaporator and condenser sections have
been mounted, the interconnecting refrigerant tubing
can be fabricated. For cooling systems where the
indoor and outdoor sections are installed at the same
elevation, refrigerant line sizes can be usually matched
with the factory supplied fittings, shown in the
accompanying table below. There are exceptions for
total line lengths exceeding 75 feet where pressure
drop limitations are exceeded. For further information
refer to JCI Application Data Sheet 247077-UAD-H-
0209: “General Piping Recommendations and
Refrigerant Line Length for Split-System Air
Conditioners and Heat Pumps”.
The following guidelines apply to field fabricated piping:
Use hard drawn refrigeration type copper tubing
where no appreciable amount of bending around
pipes or obstructions is necessary. If soft copper
must be used, care should be taken to avoid sharp
bends which may cause a restriction. Route
refrigerant tubing for minimum linear length, and
minimum number of bends and fittings. Use of long
radius elbows for all 90-degree bends is
recommended.
Braze all copper to copper joints with Silfos-5 or
equivalent brazing material. DO NOT USE SOFT
SOLDER.
During brazing operations, flow an inert gas such
as nitrogen through the system to prevent internal
scaling and contamination.
Traps are not required if the piping is properly sized as
they will only increase the pressure drop across the
system, further reducing capacity.
Once the brazing operation of refrigeration lines is
completed, the field-brazed connections must be
checked for leaks. Pressurize the system to a minimum
of 200 psig. Use soap bubbles or alternate methods of
leak-checking all field brazed joints. After completion of
the leak check, evacuate the interconnecting lines to
hold a 350-micron vacuum. If gauge pressure rises
above 500 microns in one minute, then evacuation is
incomplete or the system has a leak.
RECOMMENDED REFRIGERANT LINE SIZES
Model #
LESS THAN 75 LINEAR FEET
LIQUID LINE
SUCTION LINE
DSH024C
3/8
3/4
DSH036C
3/8
3/4
DSH048C
1/2
7/8
DSH060C
1/2
7/8
DSH096B
2 X 1/2
2 X 7/8
DSH120B
2 X 1/2
2 X 7/8
DUCTWORK
When installing ductwork, adhere to local Codes and
sensible practice. Minimize duct runs and avoid abrupt
changes in direction where possible. Allow ample
access space for servicing of the coils and changing of
filters. Perform regular maintenance on ducts to
increase unit life, maintain efficient operation, and
reduce accumulation of explosive dust. Refer to blower
performance charts, and engineer duct runs and
accessory pressure drop so as not to exceed maximum
external static values.
Louver sizing guidelines
One of the key issues in obtaining optimum
performance from indoor air-conditioners is the proper
selection of the condenser intake and discharge
louvers. Unlike outdoor air cooled units, which intake
and discharge their cooling virtually unrestricted, indoor
units must overcome the resistance of grilles or louvers
at the outside wall - plus the restriction of any
interconnecting ductwork.
Our indoor air cooled air-conditioners are designed to
accommodate the external static pressure loss
associated with properly sized louvers of the "storm
proof” type. This type of louver typically has a free area
approximately 40-45% of the actual louver size. To
determine the free area required for any given unit,
adhere to the following guidelines:
- Size condenser air intakes for 500-750 feet/minute
nominal velocity (Maximum recommended 800
feet/minute)
- Size condenser air discharge for 1,200-1,500 feet
/minute nominal velocity (Maximum recommended
1,700 feet/minute)
FORM 145.32-IOM4 (818)
20
The use of louvers with higher velocities than above
may be employed, at the discretion of the
engineer/installer, provided that the total air pressure
drop does not exceed the capability of the condenser
fan and motor. The use of low restriction louvers with
shallow blade angles can allow higher face velocities
without excessive static pressure loss.
Exceeding the static pressure capability of the
condenser fan will result in insufficient condenser air
volume. This will cause a loss in system capacity, and
may cause compressor shut-down during high ambient
periods. (Installation of an oversize condenser
motor/drive, where applicable, may be considered in
such cases.)
(As a general rule, these velocities will require an intake
louver sized approximately 1.25 to 1.5 times the
dimensions of the duct connection on the unit, and a
discharge louver sized approximately 1.5 to 2 times the
duct connection dimensions.)
Use only louver sections that provide different
deflection angles for air discharge and air intake, to
ensure the unit does not short circuit. Protect the unit
from weather conditions (rain, snow) entering through
the condenser air intake. All outdoor air ducts should
pitch away from the unit, toward the outside wall.
Connect all ducts to unit with canvas section duct
connectors or choose another suitable noise and
vibration absorbing device.
The Manufacturer will not accept any
liability resulting from incorrect instal-
lation of this equipment. Follow instal-
lation instructions carefully.
ELECTRICAL WIRING
Follow local electrical codes when making electrical
connections. Units are completely factory wired for
normal supply voltages (i.e. 208-230, 460,
575V/3Ph/60Hz) Confirm unit specifications by
checking unit data plate. The factory wiring terminates
in two boxes, one in each section of the unit. The
electrical control boxes are located behind outer
access panels. Each electrical compartment has its
own control cover.
Provide individual power disconnects for each unit, or
each section in the case of split applications. Install a
secure ground to both evaporator and condenser. If
canvas flexible joints are used on ductwork, install a
ground wire to the ductwork as well. Unit requires
installer to provide a 24volt thermostat with appropriate
heating and cooling stages as needed. The condenser
section electrical cover is installed with wiring diagrams
on the inner access door, which must be opened to
read the diagrams
DISCONNECT AND LOCK OUT POWER
WHEN SERVICING UNIT. UNIT MAY
START AUTOMATICALLY IF POWER IS
NOT DISCONNECTED. FAILURE TO DO
SO MAY RESULT IN PERSONAL IN-JURY
OR DEATH DUE TO ELECTRICAL
SHOCK.
PACKAGED UNIT
If unit is to be installed as a packaged unit, the
thermostat (low voltage) wiring and power wiring will be
brought through the evaporator section. Check the unit
nameplate for minimum circuit ampacity and fuse
sizing.
SPLIT SYSTEM
If the unit is a split system application (condenser
section remote from evaporator section), refer to the
wiring diagram below.
IMPORTANT: All wiring must comply with
applicable local and national codes
(NEC). Type and location of disconnect
switches must comply with all applicable
codes.
For low voltage thermostat wiring, 18 Ga. wires may be
used for up to 50 feet lengths. Low voltage runs up to
125 feet require 16 Ga. wires.
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Johnson Controls DSH048C Installation, Operation & Maintenance Instructions Manual

DSH048C
Johnson Controls
Brand
Johnson Controls
Model
DSH048C
Category
Split-system air conditioners
Type
Installation, Operation & Maintenance Instructions Manual
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