Lennox LB-83114C, 61H42 User Manual

HEAT PUMP KITS AND ACCESSORIES

Litho U,S,A.

Dallas,Texas 9/93

502,673M

Supersedes 3/92

SOLID STATE DEFROST

REPLACEMENT BOARD

INSTALLATION INSTRUCTIONS FOR SOLID STATE DEFROST REPLACEMENT BOARD

LB-83114C (61H42) USED ON HP7-1, -2, HP8, CliP9 AND CliP10 SERIES UNITS

,/SHIPPINGANDPACKING _ : : :: : ]

Package 1 of 1 contains:

1- Control board on mounting bracket 1- Defrost thermostat

1- Outdoor fan/defrost relay

8- Wires with 3/16" terminals

1- Screw

2- Wire nuts

/tNSTA_TiON: :

1- Turn off power supply to unit. 2- Remove compressor access panel and control

box cover.

A- Defrost Thermostat

3- Disconnect coil thermistor from coil return bend

and air thermistor from fan section. Replace coil thermistor with provided defrost thermostat.

Secure to liquid line as close as possible to the outdoor coil.

NOTE-/t may be necessary to remove the front corner

panel for access to coil thermistor,

B-Defrost Board

4- Remove and retain screwfrom existing solid state

defrost board located in control box. Note existing wiring. See figure 1.

5- Install newcontrol board assembly using existing

screw and hole.

6- Drill new hole into control panel and secure with

screw provided in kit.

C-Outdoor Fan/Defrost Relay

7- Remove outdoor fan/defrost relay. Install

replacement outdoor fan/defrost relay.

1- Connect one end of long wire (provided) to "HLD"

terminal on the defrost board. Disconnect defrost

high pressure switch from between high pressure switch and loss of charge switch.

2-Splice remaining end of long wire to wire

between high pressure switch and toss of charge

switch where high pressure switch was originally connected.

3- Connect onewire from defrost relaycoitto "OUT"

terminal of defrost board.

4- Cut off terminal of remaining wire from defrost

relay coil and strip wire 5/8 inch. At a convenient location, splice wire to long wire from "HLD"

terminal using a wire nut.

5- Connect wire from defrost thermostat to one of

the "24V" terminals on defrost board.

IMPORTANT-Make sure defrost thermostat is securely fastened to the fiquid line.

6- Cut off terminal from remaining defrost

thermostat wire and strip wire 5/8 inch. Splice with one of the defrost pressure switch wires

using a wire nut.

7- Locate blue transformer wire and splice with

remaining defrost high pressure switch wire using a wire nut.

8- Connect the remaining existing wire to "COM"

terminal on defrost board.

9- Defrost time interval can be selected to defrost

every 30, 60 or 90 minutes. This is selected using the jumper on the defrost board.

10-Replace all panels and restore power to unit.

Page 1

TOP VIEW FRONT VIEW

REPLACEMENT

BOARD

REMOVE

EXISTING BOARD

Use existing hole to

install replacement board

®1

Drill new hole into

control box panel

FIGURE 1

DEFROST TIME

INTERVAL JUMPER

0 _o

RST

HLD

24V

OUT

COM

_ INTERNAL

JUMPER

_] HIGH

PRESSURE

SWITCH

LOSS OF

, CHARGE ._ SWITCH

DEFROST

BOARD

COMPRESSOR

CONTACTOR

TYPICAL WIRING

RST 0

HLD

24V * _)-

OUT (_

tOM9

EXISTING TRANSFORMER

COMMON YELLOW WIRE

DEFROST THERMOSTAT

OUTDOOR FAN AND

DEFROST RELAY

EXISTING TRANSFORMER

24V POWER BLUE WIRE

DEFROST HIGH

PRESSURE

SWITCH

*NO TE-- No external/umper tsrequtred for

24VAC terminals. The 2,4V terminals are jumpered lnternal/}z Either termina/ may be

connected to defrost thermostat•

Page 2

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