Page 19
FIGURE 3
M4 (A55)
A178 T1 T18 A96 K203K202 K3 F10 K1 K191 K2 K14 K146 K65
K231
K9
T59
(G volt
T5
(G volt)
VSC Inverter
ELECTRIC HEAT SECTION
ELECTRIC HEAT SECTION
4-Terminal Block TB13
TB13 terminal block distributes line voltage power to the
line voltage items in the unit.
5-Outdoor Fan Motor Fuse Block & Fuses F10
Power Exhaust Fan Motor Fuse Block and
Fuses F6.
STD SCCR 240V, 300V and higher rated SCCR units have
three line voltage fuses F10 provide overcurrent protec
tion to all condenser fans. Two line voltage fuses F6 pro
vide overcurrent protection to the two optional power ex
haust fans. The fuses are rated at 30A in all 208/230V
units but 10A in the 208/230V 240U and 300U models.
6-Compressor Contactor K1, K2, K14, K146
K1, K2, K14: All units
K146: 210, 240, 300
All compressor contactors are three‐pole‐double‐break
contactors with 24VAC coils. K1 and K2 (energized by A55)
energizes compressors B1 and B2 in response to first stage
cool demand. In 180 units K14 (energized by A178) ener
gizes B13 in response to second stage cool demand. In
210, 240 and 300 units K14 and K146 (energized by A178)
energize compressors B13 and B20 in response to second
stage cool demand.
7-Blower Contactor K3
Blower contactor K3, used in all units, is a three‐pole‐double‐
break contactor with a 24VAC coil used to energize the indoor
blower motor B3 in response to blower demand. K3 is ener
gized by Unit Controller (A55). Optional Staged-Blower units
which are not equipped with a bypass option will not have a K3.
8-Ultraviolet Germicidal Lamp (UVC) Trans
former T49
UVC transformer T49 is used by units of all voltages except
208/230V and 575V which are equipped with a UVC. The
auto voltage to 230VAC transformer is installed in the con
trol box. The transformer has an output rating of 0.5 amps.
T49 transformer supplies 230VAC power to the UVC lamp.
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