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Page 20 USSC
WIRING DIAGRAM
NOTE: RHEOSTAT IS ADJUSTABLE. IN CASE OF LOW VOLTAGE
TURN COUNTERCLOCKWISE UNTIL BLOWER WILL RUN, BUT
NOT STALL, WHEN POWER IS RETURNED TO UNIT.
RHEOSTAT
PT# 80090
ROOM
THERMOSTAT
YG
W
CR
1
4
COIL
3
6
COIL
2
5
BLUE
BLACK
RELAY
BOTTOM
BLUE
BLACK
RED
ORANGE
(3)
PT# 80390
(LOCATED ON LEFT
OF BOX)
BLACK
(2)
PT# 80388
(LOCATED ON RIGHT
SIDE, TOP)
(1)
PT# 80389
BROWN
(LOCATED ON RIGHT
SIDE, BOTTOM)
ORANGE
BLUE
BLACK
PURPLE
BLACK
PURPLE
BLACK WHITE
WHITE
BLACK
BLUE
BLACK
BLUE
WHITE
ORANGE
PURPLE
GREEN
BLACK
120 VAC
60 Hz
15 AMPS
NOTE: WIRES FROM
DISTRIBUTION FAN
RUN DIRECTLY INTO
THE 4 x 4 JUNCTION
BOX.
DISTRIBUTION
FAN
PT# C60456
DRAFT FAN
PT# 80392
Rotate here
with flat-blade
screwdriver
THERMAL DISC
FAN ADJUSTMENT
DRAFT FAN
(3) HI LIMIT PT# 80390
DE-ENERGIZES WHEN UNIT
REACHES TEMPERATURES OF
APPROX. 170 DEGREES
THERMAL DISC
DISTRIBUTION FAN
(1) HI-SPEED PT# 80389
ENERGIZES WHEN UNIT IS
FIRED AGGRESSIVELY ONLY.
(2) LOW SPEED PT# 80388
ADJUSTABLE IN APPROX.
5 DEGREE STEPS. A LOW
SETTING TURNS BLOWER ON
SOONER.
NOTE:
CAP OFF “RED”
WIRE WITH A
WIRE NUT.