Service manual

SECTION 10: WIRING
23 of 59
10.4 Low Voltage Thermostat with Multiple Heaters (Models UHA[T][X][S]150 - 250)
NL
Gnd.
NL
Gnd.
L
N
Gnd.
120V-60 Hz
NOTE: If both the heat and fan only operations are to be used, two relays will be required per group of heaters.
supply circuit
Low Voltage Thermostat
RC
W
G
Y
1
2
3
4
5
6
COIL COIL
Black
Black
White Red
Transformer Relay
FRONT VIEW BACK VIEW
NL
Gnd.
Heater 3 Heater 4
Heater 1 Heater 2
NL
Gnd.
Purple
Red/Yellow
Model Relay Type Relay Part Number Max. Number of Heaters
UHA[T][X][S]150 - 250 DPST 90436300 4