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
have three line voltage fuses F10 provide overcurrent pro-
provide overcurrent protection to the two optional power
6-Compressor Contactor K1 and K2
All compressor contactors are three-pole-double-break
response to second stage cool demand.
7-Blower Contactor K3
-
ble-break 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.
8-Ultraviolet Germicidal Lamp (UVC) Transformer T49
which are equipped with a UVC. The auto voltage to
transformer has an output rating of 0.5 amps. T49 trans-
former supplies 230VAC power to the UVC lamp.
-
lished or system locks out. For a more detailed description
see the Gas Heat Components section.
9-Power Exhaust Relay K65 & K231 (PED units)
relays with a 24VAC coil. The relay are used in units
and when K231 closes B11 is energized.
10-Variable Frequency Drive A96 (optional)
Staged-Blower units are equipped with a VFD which alters
the supply power frequency and voltage to the blower mo-
tor. Blower speed is staged depending on the compressor
parameters in the A55 Unit Controller. The VFD is located
below the Unit Controller.
11-VFD Power To Motor Contactor K202 (optional)
Contactor is used in Staged-Blower units equipped with
a VFD bypass option. The three pole 40 amp contactor
with a 24VAC coil is energized by the A55 Unit Controller.
K202 allows power from the VFD to the B3 blower motor
in response to blower demand.
12-Inverter Start Forward Rotation Relay K203 (op-
tional)
Relay is used in optional Staged-Blower units and is a
three-pole double-throw relay with a 24VAC coil. K203 is
energized by the A55 Unit Controller and provides input to
13-Unit Controller A55
-
to the Unit Controller guide provided with the unit.
-
troller.
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