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4-C. A. I. Transformers T3, T13 (575V units)
auto voltage to 230VAC transformers are mounted in the
control box. The transformers have an output rating of
0.5A. T3 transformer supplies 230 VAC power to combus-
tion air blower motor (B6), while T13 transformer supplies
power to combustion air blower motor (B15) in all units.
T13 also provides 230VAC to optional Ultraviolet Germi-
cidal (UVC) Lamps.
5-Terminal Block TB13
TB13 terminal block distributes line voltage power to the
line voltage items in the unit.
6-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 pro-
tection to all condenser fans. Two line voltage fuses F6
provide overcurrent protection to the two optional power
exhaust fans. The fuses are rated at 30A in all 208/230V
units but 10A in the 208/230V 240U and 300U models.
7-Outdoor Fan Capacitors C1, C2, C18, C19, C20, C21
(not used in 180U, 240U, 300U)
C1, C2, & C18 used on all units
C20 & C21 used on 210, 240, 300 Units
/ 10 MFD capacitors used to assist in the start up of con-
denser fans B4, B5, B21, B22, B23 and B24 respectively.
8-Compressor Contactor K1, K2, K14, K146
K1, K2, K14 used o all units
K146 used on 180, 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
second stage cool demand. In 180U, 240U, 300U units,
K14 and K146 is energized by A178 in response to sec-
ond stage cool demand.
9-Outdoor Fan Relay K10, K68, K149, K150, K152,
K153
K10 & K68 used on all units
K152 & K153 used on 240, 300
Outdoor fan relays are DPDT relays with a 24VAC coil. In
156 units, K10 energizes fan 1 B4 and K68 energizes fan
2 B5 and fan 3 B21.
In 180H units, K10 energizes fan 1 B4, K68 energizes fan
B22. In 210, 240H and 300 units, K10 energizes fan 1 B4,
energizes fan 4 B22, K152 energizes fan 5 B23 and K153
energizes fan 6 B24.
In 180U, 240U, 300U units, K10 energizes fan 1 B4, K68
-
ergizes fan 4 B22, K152 energizes fan 5 B23 and K153
energizes fan 6 B24.
10-Blower Contactor K3
Blower contactor K3, used in all units, is a three-pole-dou-
blebreak contactor with a 24VAC coil used to energize
the indoor blower motor B3 in response to blower de-
mand. K3 is energized by Unit Controller (A55). Optional
Staged-Blower units which are not equipped with a by-
pass option will not have a K3.
11-Combustion Air Inducer Relay K13
Combustion air inducer relay K13, used in all units, is a
DPDT relay with a 24VAC coil. K13 is energized by the
from the thermostat. K13 remains energized throughout
the heating demand. When energized, K13 N.O. con-
tacts close to energize combustion air blower and begin
a heating sequence. Pressure switch S18, located in the
compressor compartment, closes as combustion air static
pressure falls to “prove” combustion air inducer operation.
When S18 closes, the ignition controls and gas valves are
energized to begin a heating sequence.
12-Combustion Air Inducer Relay K19
(second burner section)
demand.
second heat section combustion air blower and begin sec-
ond section heating sequence. Prove switch S45, located
in the compressor compartment, closes as combustion air
static pressure falls to “prove” combustion air blower oper-
ation. When S45 closes, the second section of the ignition
control and gas valve are energized to begin the second
section heating sequence.
13-Ultraviolet Germicidal Lamp (UVC)
Transformer T49
-
cept 208/230V and 575V which are equipped with a UVC.
The auto voltage to 230VAC transformer is installed in
the control box. The transformer has an output rating of
UVC lamp.
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