Specification

ManualsBrandsHoneywell ManualsHeating, Ventilation, and Air ConditioningSingle Aquastat for Slant Fin LD30P Boilers

Table Of Contents

PRODUCT DATA

60- 2278- 9

® U.S. Registered Trademark

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

Summary of content (12 pages)

PAGE 1
L8148A,E,J Aquastat® Relays PRODUCT DATA APPLICATION Horizontal Mounting 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.
PAGE 2
L8148A,E,J AQUASTAT® RELAYS 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.
PAGE 3
L8148A,E,J AQUASTAT® RELAYS Table 2. Standard L8148 Model Specifications. Model Number L8148A L8148E L8148J d,e Special Burner Provision for Circuit Mounting Adding Remote Voltage Casea Low Limit Line Horizontal Yes Low Vertical Low or millivolt Vertical or horizontal Maximum Number of Zone Controls High Second Circulator Limit Limit Control Valvesb Yes No Can be added remotely Manual/ Thermostat Auto Switch Relaysc Required — — 2 4 24V No Yes a See Fig. 1 for case dimensions.
PAGE 4
L8148A,E,J AQUASTAT® RELAYS INSTALLATION When Installing this Product… 1. VOLTAGE BARRIER 2. HIGH LIMIT DIAL TRANSFORMER 3. 4. Read these instructions carefully. Failure to follow them could damage the product or cause a hazardous condition. Check the ratings given in the instructions and on the product to make sure the product is suitable for your application. Installer must be a trained, experienced service technician.
PAGE 5
L8148A,E,J AQUASTAT® RELAYS 8. Wiring 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.
PAGE 6
L8148A,E,J AQUASTAT® RELAYS CONTROLLER CASE IMMERSION WELL CLAMP BACK OF CONTROLLER CASE BOILER IMMERSION WELL CLAMP 1 IMMERSION WELL SPUD ADAPTER ADAPTER OLD IMMERSION WELL ASSEMBLY IMMERSION WELL CLAMP SCREW SENSING BULB (A) (D) (C) (B) 2 HEAT-CONDUCTIVE COMPOUND 1 CAPILLARY TUBE 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).
PAGE 7
L8148A,E,J AQUASTAT® RELAYS L1 L2 HOT 1 24V THERMOSTAT 3 G L2 L1 T T L8148A 2 R 3 W B HIGH LIMIT B L6006 LOW LIMIT CONTROLLER R 4 C2 C1 B2 B1 TO LINE VOLTAGE OIL BURNER RELAY OR GAS VALVE CIRCULATOR G B L1 JUMPER T T R 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOADPROTECTION AS REQUIRED. 1K1 3 1K 2 REMOVE JUMPER WHEN ADDING L6006 LOW LIMIT CONTROLLER. 1K2 3 CONTROL CASE MUST BE CONNECTED TO EARTH GROUND. USE GROUNDING SCREW PROVIDED. C1 L2 4 C2 L8148A 4 B1 IS 1/4 IN.
PAGE 8
L8148A,E,J AQUASTAT® RELAYS 24V THERMOSTAT T87F ZONE 1 T87F ZONE 2 T87F ZONE 3 L8148E V8043F TV W T Z 3 B HIGH LIMIT W R B L6006 LOW LIMIT CONTROLLER V8043F END SWITCH END SWITCH TH-TR TH-TR TH R TH-TR TH TR TR 3 TH 3 TR 3 C1 C2 4 B1 V8043F END SWITCH B2 G L1 L2 4 L8148E TV CIRCULATOR TR TH THTR G T 2 L1 L2 (HOT) 1 Z B 1 LOW VOLTAGE GAS VALVE (eg, VR8300) W HIGH LIMIT R C1 C2 5 L1 1K2 B B1 1K1 R B2 L1 L2 T W 1K TV TO LOW VOLTAGE BURNER CIRCUIT 4 B
PAGE 9
L8148A,E,J AQUASTAT® RELAYS T87F T87F T87F R845 RELAY T 1 T T 2 L1 (HOT) 1 R845 3 4 5 1 6 PUMP R845 T 2 T 4 3 PUMP 5 6 1 T 2 3 4 5 6 PUMP L2 L8148E G 2 L2 L1 T T TR 3 C1 C2 B2 THTR TH B1 LOW VOLTAGE GAS VALVE (eg, VR8300) 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. 2 CONTROL CASE MUST BE CONNECTED TO EARTH GROUND. USE GROUNDING SCREW PROVIDED. 3 B1 IS 1/4 IN. TAB TERMINAL. M1620A Fig. 9.
PAGE 10
L8148A,E,J AQUASTAT® RELAYS S8610 VENT GND 24V DAMPER MV MV/PV PV (BURNER) GND 24V TH-W PLUG THERMOSTAT L8148E (STANDARD MODELS) 4 SPARK G L1 HIGH LIMIT 1K2 1 Z 1K1 T W 2 PV R B PV MV WIRING HARNESS MV 5 1K TV B1 C1 B2 C2 VR8304 D892/M892 L2 3 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. 2 REMOVE PLUG ONLY IF USING VENT DAMPER. WITH PLUG REMOVED AND VENT DAMPER CONNECTED, FUSE BLOWS WHEN THERMOSTAT FIRST CLOSES.
PAGE 11
L8148A,E,J AQUASTAT® RELAYS 24V THERMOSTAT W R TV L6006 B LOW LIMIT CONTROLLER TP 3 PP T Z 2 B MILLIVOLTAGE POWERPILE® GAS VALVE PP W HIGH LIMIT R C1 C2 TH2 B1 B2 TH1 B3 G L2 L1 5 1 CIRCULATOR TH TR LOW VOLTAGE GAS VALVE (eg, VR8300) G L8148J 4 L1 L2 (HOT) THTR 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. 2 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.
PAGE 12
L8148A,E,J AQUASTAT® RELAYS SETTING AND ADJUSTMENTS OPERATION Setting WARNING 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.