Honeywell Aquastat L8148E Specification

Honeywell
Brand
Honeywell
Model
Aquastat L8148E
Type
Specification

This manual is also suitable for

PRODUCT DATA
60- 2278- 9
® U.S. Registered Trademark
Copyright © 2001 Honeywell • All Rights Reserved
L8148A,E,J
Aquastat® Relays
APPLICATION
The L8148 Aquastat® Relays are immersion type hydronic
controllers that combine high limit protection with switching
relay control of burner and circulator motors.
FEATURES
• All models are used with a 24 Vac thermostat.
• Models include special terminals for adding remote,
low limit temperature control.
• L8148E,J have terminals for adding zone valve system
wiring.
• L8148E models are available with plug for connecting
Aquastat¨ Relay directly to D892/M892 Vent Dampers.
• All devices include transformer to provide power for
the low voltage control circuit. Different models
provide switching of line, low, or millivoltage burner
circuit.
• Case available for horizontal or vertical mounting.
• Combinations of two insulation and two insertion well
lengths are available.
Horizontal
Mounting
Vertical
Mounting
Contents
Application ........................................................................ 1
Features ........................................................................... 1
Specifications ................................................................... 2
Ordering Information ........................................................ 2
Installation ........................................................................ 4
Setting and Adjustments .................................................. 12
Operation .......................................................................... 12
Checkout .......................................................................... 12
L8148A,E,J AQUASTAT® RELAYS
60-2278—9 2
ORDERING INFORMATION
When purchasing replacement and modernization products from your TRADELINE® wholesaler or distributor, refer to the
TRADELINE® Catalog or price sheets for complete ordering number.
If you have additional questions, need further information, or would like to comment on our products or services, please write or
phone:
1. Your local Home and Building Control Sales Office (check white pages of your phone directory).
2. Home and Building Control Customer Relations
Honeywell, 1885 Douglas Drive North
Minneapolis, Minnesota 55422-4386
In Canada—Honeywell Limited/Honeywell Limitée, 35 Dynamic Drive, Scarborough, Ontario M1V 4Z9.
International Sales and Service Offices in all principal cities of the world. Manufacturing in Australia, Canada, Finland, France,
Germany, Japan, Mexico, Netherlands, Spain, Taiwan, United Kingdom, U.S.A.
SPECIFICATIONS
IMPORTANT
The specifications given in this publication do not
include normal manufacturing tolerances. Therefore,
this unit may not exactly match the listed
specifications. Also, this product is tested and
calibrated under closely controlled conditions, and
some minor differences in performance can be
expected if those conditions are changed.
TRADELINE® Models
TRADELINE® models are selected and packaged for ease of
handling, ease of stocking, and maximum replacement value.
TRADELINE® model specifications are the same as those of
standard models except as noted below.
TRADELINE® Models Available:
• L8148A Aquastat¨ Relay, without zone control terminals,
without well and spud. See Fig. 2.
• L8148E Aquastat¨ Relay with Molex® plug for use with
D892/M892 Vent Dampers; 180°F to 240°F (82°C to
116°C) scale range; without well and spud.
• L8148J Aquastat¨ Relay with zone control terminals;
without well and spud. See Fig. 3.
Scale Range: 140°F to 240°F (60°C to 116°C).
Additional Features:
• Heat-conductive compound for better bulb response in
oversized well. For more information on heat-conductive
compound, see Material Safety Data Sheet (MSDS), form
69-0955.
• Case can be vertically or horizontally mounted.
• High-limit dial stop is factory-set at end of high-limit scale;
can be adjusted.
• TRADELINE® pack with cross reference label and special
instructions.
Standard Models
Models: See Table 2.
Electrical Ratings:
Table 1. Circulator Control Circuit (Amperes).
Voltage and Frequency: 120 Vac, 60 Hz.
Burner Control Circuits:
Line Voltage: Ratings same as for circulator above.
Low Voltage: 0.8A maximum at 24 Vac.
Millivoltage: 0.25A at 1/4 to 12 Vdc.
Approvals:
Underwriters Laboratories Inc. Listed: File No. MP466, Guide
No. MBPR (models with well); Guide No. MBPR2 (models
without well).
Canadian Standards Association Certified: File No. LR1620,
Guide No. 400-E-O.
ANSI Miswiring: Models with 1/4 in. tab terminal meet ANSI
Appliance Miswiring Standard.
Immersion Well Dimensions:
Brass Spud for Boiler Fitting: 1/2 or 3/4 NPT.
Insulation Depth: 1-1/2 or 3 in. (38 or 76 mm).
NOTE: Not all models include wells. If well is not included
but is needed, refer to form 68-0040 to order.
Insertion Length: 3-3/8 in. (86 mm).
Maximum Pressure On Immersion Well:
255 psi (1758 kPa).
Maximum Bulb Temperature:
40°F higher than setpoint, or up to 265°F (23°C higher than
setpoint, or up to 129°C).
Material Safety Data Sheets (MSDS): For more information
on heat-conductive compound, see form 69-0955.
Maximum Ambient Temperature:
150°F (66°C) with 1.2A, 24V load.
77°F (25°C) with 1.4A, 24V load.
Type 120 Vac 240 Vac
Full Load 7.4 3.7
Locked Rotor 44.4 22.7
L8148A,E,J AQUASTAT® RELAYS
3 60-2278—9
Table 2. Standard L8148 Model Specifications.
a See Fig. 1 for case dimensions.
b Number of V8043 Zone Valves that can be powered from the L8148 without additional transformer(s). 1.2A load is the
maximum permissible when ambient temperature exceeds 77°F (25°C).
c Number of R8230C Relays that can be powered from the L8148. Additional relays in groups of four or fewer require an
additional transformer.
d Models available with plug for connecting L8148E directly to the D892/M892 Vent Dampers.
e Models available with plug (L8148E) and 50 VA transformer are for use with the Honeywell SV9500/SV9600 SmartValve®
System Control. No zone valves or relays can be powered from the L8148 when used with SV9500/SV9600 gas valves.
Maximum Ambient Temperature:
150°F (66°C) with 1.2A 24V load;
77°F (25°C) with 1.4A 24V load.
Thermostat Heat Anticipator Setting: 0.2A.
Standard Scale Range: 180°F to 240°F (82°C to 116°C).
Differential: Nonadjustable.
Finish: Gray enamel.
Optional Specifications:
Scale Range: 140°F to 240°F (60°C to 116°C).
High Limit Dial Stop.
Case Dimensions: See Fig. 1.
Accessories:
107408 Heat Conductive Compound (4 oz. can). For
more information, see form 69-0955, Heat Conductive
Compound.
124904 Well Adapter. For ordering information, see form
68-0040, Immersion Wells and Compression Fittings.
Fig. 1. L8148 dimensions in in. (mm).
Model
Number
Burner
Circuit
Voltage
Mounting
Casea
Special
Provision for
Adding Remote
Low Limit
High
Limit
Second
Limit
Circulator
Control
Maximum Number
of Zone Controls
Thermostat
Required
Manual/
Auto
SwitchValvesbRelaysc
L8148A Line Horizontal Yes Yes No Can be
added
remotely
— — 24V No
L8148Ed,e Low Vertical 2 4
L8148J Low or
millivolt
Vertical or
horizontal
Yes
3-1/8
(79)
1/8 (3)
6-1/8
(156)
3-3/8
(86)
2-1/8 (54)
(VERTICAL
MOUNT)
1-1/4 (32) (HORIZONTAL
MOUNT—BOTTOM)
KNOCKOUTS FOR
1/2 (13) CONDUIT
4-5/16 (110)
1-1/4 (32)
(VERTICAL
MOUNT)
3-1/16 (78)
(HORIZONTAL
MOUNT)
M8925
L8148A,E,J AQUASTAT® RELAYS
60-2278—9 4
Fig. 2. Internal view of L8148A Aquasta® Relay.
Fig. 3. Internal view of L8148E Aquastat® Relay.
INSTALLATION
When Installing this Product…
1. Read these instructions carefully. Failure to follow them
could damage the product or cause a hazardous
condition.
2. Check the ratings given in the instructions and on the
product to make sure the product is suitable for your
application.
3. Installer must be a trained, experienced service
technician.
4. After installation is complete, check out product
operation as provided in these instructions.
WARNING
Explosion Hazard.
Can cause severe injury, death or property
damage.
This product is intended for use only in systems with a
pressure relief valve.
WARNING
Electrical Shock Hazard.
Can cause severe injury, death or equipment
damage.
1. Disconnect power supply before beginning
installation to prevent electrical shock or equipment
damage.
2. Never apply a jumper across (or short) terminals
B1, B2, or B3. This burns out the transformer.
Mounting (Standard Models)
Boilers have tappings to allow immersion well (which must be
ordered separately) to be mounted horizontally so boiler water
of average temperature can circulate freely around the well.
1. Turn off all power and drain the boiler.
2. If no tapping is provided, prepare one properly sized
and threaded, and locate near the top of the boiler.
3. Coat the well threads sparingly with pipe dope, install
the well in the boiler tapping, and tighten securely.
NOTE: Do not attempt to tighten by using the case as
a handle.
4. Refill the boiler and check for water leakage.
5. Increase sensitivity of the bulb by coating with a good
heat-conductive compound. When used, coat the bulb
completely.
6. Insert the bulb element into the well until it bottoms. If
necessary, slightly bend the tube inside the case to hold
the bulb against the bottom of the well.
NOTE: Some models have a tubing length adjustable to 3 in.
(76 mm). In these models, pull out extra tubing from
inside the case, if needed.
7. Center the loop of excess tubing in front of the
immersion well so it cannot touch any electrical parts.
M8926
VOLTAGE
BARRIER
TRANSFORMER
SWITCHING
RELAY
HIGH
LIMIT
DIAL
M8927
TRANSFORMER
SWITCHING
RELAY
HIGH
LIMIT
DIAL
GROUNDING SCREW
L8148A,E,J AQUASTAT® RELAYS
5 60-2278—9
8. Fit the case onto the well so the clamp on the case
slides over the flange on the well. Tighten the clamp
screw securely.
IMPORTANT
Best thermal response is obtained with a well that
snugly fits the sensing bulb. For wells used, the bulb
should be inserted until it rests against the bottom of
the well. Use a well of correct length and bend the
tubing, if necessary, to hold the bulb against the
bottom of well, but do not make a sharp bend in the
tubing.
If the well does not fit snugly on the bulb, use the heat-
conductive compound (furnished with TRADELINE® models)
as follows: Fold the plastic bag of compound lengthwise and
twist it gently. Then snip off the end of the bag and work the
open end of the bag all the way into the well. Slowly pull out
the bag while squeezing it firmly to distribute the compound
evenly in the well. Insert the bulb all the way to the bottom of
the well. Bend the tubing, if necessary, to hold the bulb
against the bottom of the well and to hold the outer end of the
bulb firmly in contact with the side of the well (Fig. 4). Wipe
excess compound off the outer end of the well.
Mounting (TRADELINE® Models)
If the old well is suitable, use it and an immersion well adapter
(see Accessories) for the installation; otherwise, refer to the
standard mounting procedure. (Well assemblies for the
TRADELINE® Aquastat® Relays must be ordered separately;
refer to form 68-0040, Wells and Fittings for Temperature
Controllers.) The adapter has a flange at the wide end that fits
into the well clamp and is slotted lengthwise to accommodate
both the capillary tube and the short length of tube extending
from the bulb (Fig. 4).
1. Turn off all power and remove the old control. Tag each
external leadwire using the cover insert from the old
control.
2. Loosen but do not remove the well clamp screw on the
side of the control case.
3. Pull out the capillary tube until it bottoms in the well.
Place the adapter around the capillary tube so it fits into
the slot. Center the loop of excess capillary tubing in
front of the immersion well so it cannot touch any
electrical parts.
NOTE: Some models have a tubing length adjustable to 3 in.
(76 mm). In these models, extra tubing inside the
case can be pulled out, if needed.
4. Make sure the wide end of the adapter fits into the hole
in the case. Position the immersion well clamp snugly
over the flange on the adapter and tighten the clamp
screw.
5. Insert the sensing bulb into the well as shown in
Fig. 4. (Distribute heat-conductive compound prior to
insertion.)
6. Securely tighten setscrew (if present on old well)
against adapter.
Wiring
IMPORTANT
Terminals on the L8148 Aquastat¨ Relay are
approved for use with only copper wire. The
terminals allow only wrap-around wiring.
1.Strip 7/16 in. of insulation
from the wire end.
2.Wrap the wire at least 3/4 of
the distance around the screw
as shown.
3.Using a standard, flat-headed
screwdriver, tighten the screw
until the wire is snugly in
contact with the screw and contact plate.
4. Tighten the screw an additional one-half turn.
NOTE: Do not use a push-type ratchet screwdriver.
Disconnect power supply before making wiring connections to
prevent electrical shock or equipment damage.
All wiring must comply with local electrical codes and
ordinances. Do not exceed limits in the Specifications section
when applying this control.
When wiring a switch equipped with 1/4 in. tab terminal
connector, use 18 to 22 gauge wire with AMP Inc. part no.
2-520129-2 fully insulated flag receptacle connector or
equivalent.
The L8148E,J can power up to two V8043 Zone Valves.
Additional valves, in groups of two or fewer, require an
additional transformer. Follow appropriate wiring diagrams,
see Fig. 5 through 14, when using zone valves or a low limit
controller.
NOTE: On systems requiring a vent damper, the vent
damper can be connected directly to some L8148E
Aquastat® Relay models (Fig. 12) or an S8610
Ignition Module (Fig. 11).
When the vent damper is plugged into the Aquastat¨ Relay, a
fuse in the Aquastat¨ Relay will blow when the thermostat first
closes. Once the fuse is blown, the Aquastat¨ Relay will not
operate unless the vent damper is connected.
When the vent damper is plugged into the Aquastat¨ Relay, a
fuse in the Aquastat¨ Relay will blow when the thermostat first
closes. Once the fuse is blown, the Aquastat¨ Relay will not
operate unless the vent damper is connected.
With the vent damper plugged into the S8610, a fuse in the
ignition module will blow when first powered. Once the fuse is
blown, the ignition module will not operate unless the vent
damper is connected.
M8843
L8148A,E,J AQUASTAT® RELAYS
60-2278—9 6
Fig. 4. Position of bulb in immersion well, and use of well adapter when required.
CAUTION
Equipment Damage Hazard.
Exceeding load limits can damage the equipment.
1. When L8148E or J is used to power zone valves,
low voltage 1.4A; 1.2A load is the maximum
permissible when ambient temperature exceeds
77°F (25°C). Use additional transformer(s) if load
exceeds ratings.
2. When L8148E (with 50 VA transformer) is used to
power SV9500/SV9600, a separate transformer
must be used to power zone valves.
CONTROLLER
CASE IMMERSION
WELL CLAMP
ADAPTER
IMMERSION
WELL SPUD
BOILER
OLD IMMERSION
WELL ASSEMBLY
BACK OF
CONTROLLER
CASE
IMMERSION
WELL CLAMP
SCREW
ADAPTER
SENSING
BULB
HEAT-CONDUCTIVE COMPOUND
SETSCREW
CAPILLARY
TUBE
(C)
IMMERSION
WELL CLAMP
IMMERSION
WELL CLAMP SCREW
SHORT TUBE
FITS IN CENTRAL
RECESS OF ADAPTER
BEND THE CAPILLARY TUBE TO HOLD THE SENSING BULB IN GOOD
THERMAL CONTACT WITH THE IMMERSION WELL AT POINTS (A) AND (B).
ASSURE THAT CAPILLARY TUBE FITS FREELY IN THE ADAPTER SO THE
TENSION OF THE CAPILLARY TUBE AT POINT (C) HOLDS THE SENSING
BULB IN GOOD THERMAL CONTACT WITH THE IMMERSION WELL AT POINT (D).
M8830
1
1
2
2(D)
(B)
(A)
L8148A,E,J AQUASTAT® RELAYS
7 60-2278—9
Fig. 5. External connections and internal schematic for L8148A.
Fig. 6. Wiring L8148A in oil-fired, forced hot water, no tankless, zoned, pump system.
C1 C2 B1 B2
R
W
B
GL1 L2 TT
3
B
R
L1
L2
G
TT3
C1
C2 B2 B1
JUMPER
1K 1K2
1K1 BR
L6006
LOW LIMIT
CONTROLLER
L1
HOT L2 24V
THERMOSTAT
L8148A
HIGH
LIMIT
TO LINE
VOLTAGE
OIL BURNER
RELAY OR
GAS VALVE
CIRCULATOR
POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOADPROTECTION AS REQUIRED.
REMOVE JUMPER WHEN ADDING L6006 LOW
LIMIT CONTROLLER.
CONTROL CASE MUST BE CONNECTED TO EARTH
GROUND. USE GROUNDING SCREW PROVIDED.
B1 IS 1/4 IN. TAB TERMINAL.
1
2
3
4
4
1
2
3
M2842A
L8148A
4
L8148A,E,J AQUASTAT® RELAYS
60-2278—9 8
Fig. 7. External connections and
internal schematic for L8148E.
Fig. 8. Wiring L8148E with multizone valves.
L1
(HOT)
L2
1
2
4
3
1
2
3
4
4
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
CONTROL CASE MUST BE CONNECTED TO EARTH
GROUND. USE GROUNDING SCREW PROVIDED.
REMOVE JUMPER WHEN ADDING L6006 LOW LIMIT
CONTROLLER TO SYSTEM.
B1 IS 1/4 IN. TAB TERMINAL.
LOW VOLTAGE
GAS VALVE
(eg, VR8300)
TR TH
THTR
24V
THERMOSTAT
L8148E
CIRCULATOR
HIGH
LIMIT
L6006
LOW LIMIT
CONTROLLER
JUMPER
1K2 1K1
1K
L8148E
L2
L2
L1
L1
G
G
Z
Z
WT
T
TV
TV
B1
B1
B2
B2
C1
C1
C2
C2
R
R
R
B
B
B
W
W
M1621B
L1
(HOT)
L1
(HOT)
L2
L2
1
1
2
4
3
TO LOW
VOLTAGE
BURNER
CIRCUIT
TR
TH
TH-TR
T87F
ZONE 3
T87F
ZONE 2
T87F
ZONE 1
L8148E
CIRCULATOR
HIGH
LIMIT
L2
L1 G
Z
TTV
B1 B2
C1 C2
R
B
W
END SWITCH
V8043F
3
TR
TH
TH-TR
END SWITCH
V8043F
3
TR
TH
TH-TR
END SWITCH
V8043F
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
CONTROL CASE MUST BE CONNECTED TO EARTH GROUND.
USE GROUNDING SCREW PROVIDED.
ADD JUMPER AS SHOWN.
L8148E POWERS TWO V8043 ZONE VALVES, OR ONLY ONE V8043
WHEN AMBIENT TEMPERATURE EXCEEDS 77°F (25°C). USE AN
ADDITIONAL TRANSFORMER FOR ADDITIONAL VALVES;
A MAXIMUM OF TWO VALVES CAN BE POWERED WITH ONE
TRANSFORMER.
B1 IS 1/4 IN. TAB TERMINAL.
1
2
3
4
5
5
M1622C
L8148A,E,J AQUASTAT® RELAYS
9 60-2278—9
Fig. 9. Wiring L8148E in a gas-fired, 24V, forced hot water, no tankless, zoned, pump system.
Fig. 10. Wiring L8148E in multizone system with R845 switched circulator.
TT
123456
TT
123456
TT
123456
GL2L1 T T
C1 C2 B2 B1
L1
(HOT)
L2
PUMP PUMP PUMP
T87F T87F T87F
R845 RELAY R845 R845
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
CONTROL CASE MUST BE CONNECTED TO EARTH GROUND.
USE GROUNDING SCREW PROVIDED.
B1 IS 1/4 IN. TAB TERMINAL.
1
2
3
3
L8148E
2
1
M1620A
LOW VOLTAGE
GAS VALVE
(eg, VR8300)
TR
TH
THTR
L1
(HOT)
L2
1
2
3
1
2
3
POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
CONTROL CASE MUST BE CONNECTED TO EARTH
GROUND. USE GROUNDING SCREW PROVIDED.
B1 IS 1/4 IN. TAB TERMINALS. M8888
TV
T
W
Z
B1
B2
C1
C2
L1
L2
G
24V
THERMOSTAT
CIRCULATOR
ZONE 1
L8148E
2
1
4
3
5
6
R845A RELAY ZONE 1
TO ADDITIONAL R845A
RELAYS FOR OTHER ZONES
LOW VOLTAGE
GAS VALVE
(VR8300)
TR
TH
THTR
L8148A,E,J AQUASTAT® RELAYS
60-2278—9 10
Fig. 11. Wiring L8148E with S8610A,F Intermittent Pilot Ignition Module with
automatic vent damper plug and Honeywell D892/M892 Vent Damper.
Fig. 12. Wiring L8148E with internal plug directly to D892/M892 Vent Damper in hydronic intermittent pilot system.
3
1
2
3
4
5
4
5
2
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
REMOVE PLUG ONLY IF USING VENT DAMPER. WITH PLUG REMOVED AND VENT DAMPER CONNECTED, FUSE BLOWS
WHEN THERMOSTAT FIRST CLOSES. THEN MODULE OPERATES ONLY WHEN VENT DAMPER IS CONNECTED.
CAREFULLY FOLLOW WIRING; MISWIRING COULD RESULT IN CONSTANT ON.
CONTROL CASE MUST BE CONNECTED TO EARTH GROUND. USE GROUNDING SCREW PROVIDED.
B1 IS 1/4 IN. TAB TERMINAL.
S8610
MV MV/PV PV GND
(BURNER) 24V
GND 24V TH-W SPARK
VENT
DAMPER
PLUG
THERMOSTAT
L8148E (STANDARD MODELS)
G
L1
1K2 HIGH LIMIT
L2
ZW1K T
TV B1 C1
B2 C2
VR8304
WIRING
HARNESS
D892/M892
BR1K1
M2298D
PV
PV
MV
MV
24V GND
24V
S8600
L1
(HOT) L2
1
1
2
3
4
5
L8148E
4
2
3FUSE
5
1
2
3
5
6-PRONG FEMALE MOLEX
RECEPTACLE IN L8148E
AND 5-PRONG MALE
MOLEX PLUG ON CABLE
1K1
B1 B2 L1
C1 C2
L2 CIRCULATOR
POLARIZED 4-PRONG
MALE MOLEX PLUG AND
4-PRONG FEMALE
MATING PLUG ON CABLE
1
2
3
4
24 VAC
THERMOSTAT
D892/M892 4 197516A
CABLE
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
REMOVE PLUG-IN THAT JUMPERS PINS 2 AND 3 WHEN USING VENT
DAMPER.
AFTER VENT DAMPER IS PLUGGED INTO L8148E, FUSE BLOWS
WHEN THERMOSTAT FIRST CLOSES. AFTER FUSE BLOWS, L8148E
OPERATES ONLY WHEN VENT DAMPER IS CONNECTED.
SEE VENT DAMPER PRODUCT SPECIFICATIONS FOR INTERNAL
SCHEMATICS.
B1 IS 1/4 IN. TAB TERMINAL. M1624C
1K2
HIGH LIMIT
CONTROLLER
R
B
TV WT
1K
Z
L8148A,E,J AQUASTAT® RELAYS
11 60-2278—9
Fig. 13. Internal schematic and external connections for wiring L8148J for either low voltage or millivoltage gas valves.
Fig. 14. Multizone system with R882C switched circulator.
L1
(HOT)
L2
1
14
5
5
1
2
3
4
5
2
3
POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
REMOVE Z-W JUMPER IF SERIES 60 LOW LIMIT IS USED.
WIRE LOW LIMIT CONTROLLER OR ZONE VALVES AS
SHOWN. USE WITH 24V (B1-B3) CIRCUIT ONLY.
FOR 24V BURNER, WIRE B1-B3 AND USE JUMPER Z-W
AND TP-Z. FOR POWERPILE® (MILLIVOLTAGE) GAS
VALVES, REMOVE JUMPER TP-Z AND WIRE BURNER
B1-B2. JUMPER Z-W REMAINS IN POSITION.
CONTROL CASE MUST BE CONNECTED TO EARTH
GROUND. USE GROUNDING SCREW PROVIDED.
B1 IS 1/4 IN. TAB TERMINAL.
L6006
LOW LIMIT
CONTROLLER
POWERPILE® MILLIVOLTAGE
GAS VALVE
PP
PP
TH2
TH1
W
R
R
R
B
B
B
24V
THERMOSTAT
L8148J
CIRCULATOR
G
G
L1
L1
L2B3B2B1
HIGH
LIMIT
TP
TV T
W
Z
C1 C2
TR TH
THTR
LOW VOLTAGE
GAS VALVE
(eg, VR8300)
1K3
TP
ZWT
TV
1K2
AUTO
MANUAL
SWITCH
1K1
C1
C2
B3 B2 B1
L2
L8148J
M1793B
TV
T
W
W
Z
B1
B2
C1
C2
L1
L2
G
L8148
CIRCULATOR
ZONE 1 CIRCULATOR
ZONE 2 CIRCULATOR
ZONE 3
L1
(HOT)
L2
1
2
3
4
5
6
1
2
3 4
5
4
6
POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
CONTROL CASE MUST BE CONNECTED TO EARTH
GROUND. USE GROUNDING SCREW PROVIDED.
AS MANY AS THREE R882C RELAYS CAN BE
POWERED BY THE L8148E OR J. ADDITIONAL
GROUPS, WITH A MAXIMUM OF THREE RELAYS PER
GROUP, REQUIRE AN ADDITIONAL TRANSFORMER.
R882C IS PROVIDED WITH NEC CLASS 1 ENCLOSURE.
L8148E SHOWN. L8148J IS IDENTICAL EXCEPT WITH
ADDITION OF TP AND BE TERMINALS.
B1 IS 1/4 IN. TAB TERMINAL.
M1623B
TO
BURNER
CIRCUIT
N.O.
N.C.
COM.
N.O.
N.C.
COM.
R882C
BW
N.O.
N.C.
COM.
N.O.
N.C.
COM.
R882C
BW
N.O.
N.C.
COM.
N.O.
N.C.
COM.
R882C
B
T87F
ZONE 1 T87F
ZONE 2 T87F
ZONE 3
60-2278—9 G.R. Rev. 12-01 www.honeywell.com
Automation and Control Solutions Automation and Control Solutions
Honeywell Honeywell Limited-Honeywell Limitée
1985 Douglas Drive North 35 Dynamic Drive
Golden Valley, MN 55422 Scarborough, Ontario
M1V 4Z9
Printed in U.S.A. on recycled
paper containing at least 10%
post-consumer paper fibers.
L8148A,E,J AQUASTAT® RELAYS
SETTING AND ADJUSTMENTS
Setting
High Limit Switch
Heating systems differ and the correct temperature setting for
one system may not be the correct setting for another. Follow
the boiler manufacturer recommendations for proper setting.
With cover off, turn the dial until the desired setting is directly
below the indicator. Models with optional dial stop can be
adjusted using a small screwdriver as shown in Fig. 15.
Fig. 15. Adjusting models with optional dial stop.
OPERATION
WARNING
Explosion Hazard.
Can cause severe injury, death or property
damage.
This product is intended for use only in systems with a
pressure relief valve.
The switching relay is controlled by the low voltage room
thermostat. On a call for heat, the relay contacts make to
complete the line voltage circulator circuit and also the burner
circuit when the boiler water temperature is below the high
limit. The high limit switch shuts off the burner if boiler water
temperature exceeds the high limit setting.
The AUTO-MANUAL switch (only L8148J millivolt models)
operates the burner during electrical power failure. With the
switch at MANUAL, the burner operates continuously until
high limit is reached or the switch is reset to AUTO. The
circulator, requiring line voltage, is inoperative. When power is
restored, reset the switch to AUTO to resume automatic
operation.
CAUTION
Equipment Damage Hazard.
Can cause equipment damage and operational
failure.
Never apply a jumper across (or short) terminals B1,
B2, or B3. This burns out the transformer.
CHECKOUT
Put the system in operation and observe through at least one
complete cycle to be sure all equipment functions as
described in the Operation section.
INSERT CORNER OF SMALL
SCREWDRIVER IN THIS
NOTCH AND PRY STOP
UPWARD FROM DIAL FACE
WHILE HOLDING STOP AWAY
FROM DIAL FACE WITH
SCREWDRIVER, TURN
DIAL UNTIL DESIRED HIGH
LIMIT SETTING IS ALIGNED
WITH POINTER
RELEASE SCREWDRIVER;
MAKE SURE HIGH-LIMIT
STOP RESTS FLAT
AGAINST DIAL FACE
POINTER
HIGH LIMIT
STOP
DIAL FACE
M8889
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Honeywell Aquastat L8148E Specification

Honeywell
Brand
Honeywell
Model
Aquastat L8148E
Type
Specification
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