Honeywell Electronic Aquastat L7148F Manual

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L7148F WITH QUICK CONNECTS
(SENSOR NOT INCLUDED)
L7148F WITH PLUG CONNECTIONS
(SENSOR NOT INCLUDED)

GENERAL

The L7148F Electronic Aquastat
type hydronic controller that provides high limit protection
and controls circulator, gas valve and optional vent damper
equipment. The complete L7148F system requires a sensor,
immersion well and transformer, all of which must be ordered
separately. See Table 1 for sensor specifications.
An external 120 Vac to 24 Vac transformer is required to
power the L7148F. For total external transformer VA
requirements, add the 10 VA requirement for the control,
gas valve load requirement (connections B1, B2), zone valve
connection requirement (see zone valve specifications), vent
damper requirement and VA requirement for any other
equipment. Total low voltage load must not exceed 4A.
® U.S. Registered Trademark
Copyright © 2001 Honeywell • All Rights Reserved
Electronic Aquastat
®
Controller is an immersion
®

FEATURES

• Available with quick connect or AMP
connections. T, TV and Z terminals are provided
in a terminal block with screw connections.
• Vent damper plug optional.
• Separate high limit control not required.
• Software defined minimum/maximum limit settings.
• External 120 Vac to 24 Vac transformer, ordered
separately, is field replaceable and upgradable.
• Patented limit rated 209659A,B,C Sensors are
separately replaceable.
• Communications port for future field added advanced
feature modules.
• Flush mounted to sheet metal rather than spud
mounted to sensing well.
• 3/16 in. (5 mm) B1 quick connect and AMP plug
connections meet ANSI miswiring requirements.
• UL353 Limit Controls approval for both U.S. and
Canada.
• Meets UL 1998 Software Safety Standards.
• Diagnostic LED to assist in system troubleshooting.
General .............................................................................
Features ...........................................................................
Specifications ...................................................................
Ordering Information ........................................................
Installation ........................................................................
Adjustment .......................................................................
Operation ..........................................................................
Checkout .......................................................................... 11
Troubleshooting ................................................................ 11
L7148F
Controller
PRODUCT DATA
®
plug
Contents
1
1
2
2
3
5
5
68-0189- 2

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  Summary of Contents for Honeywell Electronic Aquastat L7148F

  • Page 1: Table Of Contents

    Specifications ..............equipment. Total low voltage load must not exceed 4A. Ordering Information ............Installation ................ Adjustment ............... Operation ................Checkout ................11 Troubleshooting ..............11 ® U.S. Registered Trademark Copyright © 2001 Honeywell • All Rights Reserved 68-0189- 2...
  • Page 2: Specifications

    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.
  • Page 3: Installation

    CONTROLLER Immersion Well: Available separately. Contact your Transformer: Available separately with either quick connect distributor or Honeywell sales representative to order, or terminals or AMP plug connections. Contact your refer to Accessories for Immersion Wells, Compression distributor or Honeywell sales representative to order.
  • Page 4 An AMP plug connection is shown in Fig. 8. JAWS OF The L7148F and appropriately sized external transformer can CLAMP power up to three Honeywell V8043 Zone Valves. Additional valves, in groups of three or less, require an additional CLAMP transformer, or use Honeywell R8889 Zone Valve Panel.
  • Page 5: Adjustment

    CONTROLLER OPERATION A system containing an L7148F Electronic Aquastat does not require a separate high limit controller. The L7148F can replace a Honeywell L4080 High-Limit Controller and an DISCONNECT OPTIONAL VENT DAMPER PLUG R8225 Transformer. The L7148F does not provide a low limit SWITCH function.
  • Page 6 ® L7148F ELECTRONIC AQUASTAT CONTROLLER Table 2. Sequence of Operation Operation Thermostat Mode Burner Circulator Normal High Limit Normal High Limit Either Reset POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. GROUND MUST BE AN EARTH GROUND CONNECTION. DISCONNECT OPTIONAL VENT DAMPER PLUG...
  • Page 7 ® L7148F ELECTRONIC AQUASTAT CONTROLLER L7148F TO ADDITIONAL R845A T87F T87F T87F RELAYS FOR OTHER ZONES R845A RELAY ZONE 1 R845 RELAY R845 R845 PUMP PUMP PUMP DISCONNECT SWITCH OPTIONAL VENT DAMPER PLUG THTR L7148F VOLTAGE GAS VALVE LOW VOLTAGE (VR8300) GAS VALVE (VR8300)
  • Page 8 REFER TO APPLICATION SECTION. SENSOR MODULE R IS A CONVENIENCE TERMINAL FOR 24V HOT CONNECTION FOR USE WITH IGNITION CONTROLS. THERMOSTAT M11478B Fig. 8. Wiring L7148F with S8610 Intermittent Pilot Ignition Module with automatic vent damper plug and Honeywell D892/D896/M892/M896 Vent Damper. 68-0189—2...
  • Page 9 ® L7148F ELECTRONIC AQUASTAT CONTROLLER S8600 DISCONNECT CIRCULATOR SWITCH L7148F CABLE D892/D896/M892/M896 L1 C2 L2 FUSE HIGH LIMIT DIAL HIGH LIMIT CONTACTS 6-PRONG FEMALE MOLEX POLARIZED 4-PRONG DATA RECEPTACLE IN L7148F MALE MOLEX PLUG AND PORT AND 5-PRONG MALE 4-PRONG FEMALE MOLEX PLUG ON CABLE MATING PLUG ON CABLE S1 S2...
  • Page 10 ® L7148F ELECTRONIC AQUASTAT CONTROLLER L7148F T87F T87F T87F ZONE 1 ZONE 2 ZONE 3 R882C R882C R882C N.O. N.O. N.O. N.C. N.C. N.C. COM. COM. COM. VALVE OR N.O. N.O. N.O. IGNITION N.C. N.C. N.C. CONTROL COM. COM. COM. CIRCULATOR CIRCULATOR CIRCULATOR...
  • Page 11: Checkout

    ® L7148F ELECTRONIC AQUASTAT CONTROLLER DISCONNECT OPTIONAL VENT DAMPER PLUG SWITCH L7148F L1 C2 L2 SV9501/SV9502; SV9601/SV9602 PILOT BURNER GROUND 24 VOLT (THROUGH 24 VOLT PILOT TUBING) COMMON CIRCULATOR 24 VOLT HIGH LIMIT DIAL THERMOSTAT OR PRESSURE SWITCH OUTPUT POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
  • Page 12 Home and Building Control Home and Building Control Honeywell International Honeywell Europe S.A. Honeywell Latin American Region Honeywell Honeywell Limited-Honeywell Limitée Home and Building Control 3 Avenue du Bourget 1985 Douglas Drive North 35 Dynamic Drive Honeywell Building 1140 Brussels...