Replacement Limit Controls
Form P-FAN&LIMIT, P/N 147678 R3, Page 7
SECTION 2C -
Functional
Replacement for
Discontinued Fan
Control, Relay Kit
P/N 63254
Instructions for Installing Time Delay Fan Relay
1) Turn off gas supply and electric.
2) Use the conduit nipple and locknut to attach the pre-wired 4x4 box to the
electrical outlet box on the unit.
3) Wire as illustrated below.
4) Turn on the electric and gas supply.
5) Refer to Operating Sequence below and verify proper operation.
NOTES: • Use type TEW-105°C or equivalent for replacement wiring on the unit.
• Use #18 gauge wire for control wiring on the unit.
• Use #14 gauge wire for line and motor wiring on the unit.
A fan relay kit (P/N 63254) may be used to replace the discontinued fan con-
trol on Models LUS/F, FM, and AFA units equipped with 24 volt controls.
This fan relay kit may also be used, if desired, on Models XA, XB, XL, XLB.
Components:
Qty P/N Description
2 42924 Red Wire Assembly, 18 ga x 6" with terminal
1 40750 Black Wire Assembly, 18 ga x 15" with terminal
1 40749 White Wire Assembly, 18 ga x 15" with terminal
1 52887 Time Delay Fan Relay, Thermodisc 12522
1 10159 Outlet Box 4"x4" x 2-1/8" DP
1 16221 Conduit Nipple, Kinray 2639
2 16222 1/2" Lockout T&B #141
1 3397 Rubber Grommet
1 1849 "U" Nut, Tinnerman #C7392-10Z
1 11813 #10x1/2" long Sheetmetal Screws
1 17320 4" x 4" Cover
2 16354 Wire Nut
Operating Sequence
1) Follow lighting instructions and establish pilot.
2) Turn on power energizing control transformer in series with limit control.
3) Thermostat calls for heat, energizing the gas valve and time delay fan
relay.
4) Fan control senses heat exchanger temperature,
energizing the fan motor.
5) When the thermostat is satised, the gas valve is de-energized, shutting off
the gas supply to the main burner.
6) When the unit has cooled, the fan control opens, shutting off the fan motor.