Honeywell Aquastat L8148A Product Data Download Page 1

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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 ........................................................................

Features ...........................................................................

Specifications ...................................................................

Ordering Information ........................................................

Installation ........................................................................

Setting and Adjustments .................................................. 12

Operation .......................................................................... 12

Checkout .......................................................................... 12

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Summary of Contents for Aquastat L8148A

Page 1: ...or 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...

Page 2: ...92 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 ca...

Page 3: ... 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 ...

Page 4: ...andard 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...

Page 5: ...ls 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 again...

Page 6: ...ansformer 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 SENS...

Page 7: ...T 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 T T 1 2 3 4 5 6 T T 1 2 3 4 5 6 T T 1 2 3 4 5 6 G L2 L1 T T C1 C2 B2 B1 F F T T L1 HOT L2 PUMP PUMP PUMP T87F T87F T87F R845 RELAY R845 R845 C554 R8184G BURNER AND IGNITI...

Page 8: ... L2 L1 L1 G G Z Z W T 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 T TV 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 REQUIR...

Page 9: ...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 T...

Page 10: ...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 Z W 1K T TV B1 C1 B2 C2 VR8304 WIRING HARNESS D892 M892 B R 1K1 M2298D PV PV MV MV 24V GND 24V S8600 L1 HOT L2 1 1 2 3 4 5 L8148E 4 2 3 FUSE 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...

Page 11: ...LVE PP PP TH2 TH1 W R R R B B B 24V THERMOSTAT L8148J CIRCULATOR G G L1 L1 L2 B3 B2 B1 HIGH LIMIT TP TV T W Z C1 C2 TR TH THTR LOW VOLTAGE GAS VALVE eg VR8300 1K3 TP Z W T 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 A...

Page 12: ...at 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 bur...

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