Page 14
I-UNIT COMPONENTS
WARNING
Electric shock hazard. Can cause injury
or death. Before attempting to perform
any service or maintenance, turn the
electrical power to unit OFF at disconnect
switch(es). Unit may have multiple power
supplies.
ELECTROSTATIC DISCHARGE (ESD)
Precautions and Procedures
CAUTION
î¨îîîîîîîîîîîîî îîîîîîîîîî îîîî îó°¨îîîî
electronic components. Take precautions
to neutralize electrostatic charge by
touching your hand and tools to metal
prior to handling the control.
î¤îîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîşîîîîîîîîîîîî
îîîîżîîîîîîîîîîîîîîîîîîîîîîŚîˇî˛îîîîˇîîîîŻîŞîˇîîîîîîîîîîîîîîîîî
îîîîîîîîîîîîîîżîîîîîîîîî¤îîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîî
îîîîîîîîîîîîîî¤îîîîŻîîîîŻîîîîîîîŻîîîîîîîîîîîîîîîîîîîîîîîîîîŻîîîîî
îîîîîîŻîîîîîîîîîîîîîîîîîŻîîîîîî
îîîî
A-Control Box Components
îŻîŞîˇîîîîîîîîîî
îîîîîîîîîîîîîîîîîîîîîîîîîîîîżîîîîîîîîîˇîîî
control box is located in the upper portion of the compres-
sor compartment.
1-Disconnect Switch S48 (Optional)
All units may be equipped with an optional disconnect
îîîîîîîîśîîîîî˛îîîîîîîîîîîîîîîîîżîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîî
î
îîîîîîîîîîîîî
îîîîîîîîîîîîîîîîîŚîĽîîîîîśîîîîîîîîŚîĽîîîîîîî
îîîîîîîîîîîîîîîîîîîîîîîîîîîî
îîîîîîîî
îîîîîîîîîîîîîîîîîîîî-
cian to disconnect power to the unit.
2-Control Transformer T43 (Re-Heat Units)
T43 is a single line voltage to 24VAC and ties into T1.
See unit diagram. T43 is mounted in the control box. The
transformer supplies power to control circuits (through
îˇîîîîˇîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîšî¤îîîîîîîîîîîîîîîîîîî
îî
îîîîîîîîîîîîîîîîîîî
îîîîîîîîîŚîĽîîîîîˇîîîîîîîîîîîîîźîîîîîîîîîî
îîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîżîîîîî
îîîîîîîîîîîîîîîŞîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîî
single primary voltage tap.
3-Control Transformer T1
All use a single line voltage to 24VAC transformer mount-
ed in the control box. Transformer supplies power to con-
trol circuits in the unit. The transformer is rated at 92VA
and is protected by a 6 amp circuit breaker (CB8). The
îîîîîîîî îîźîî îîîîîîîî îîîîîîîîîîîîî îîîî îîîîîîîî îîîîîîîî
îîîîîîîîîîîîîîîîîîżîîîîîîîîîîîîîîîîîîîîŞîîîîîîîîîîîîîîîîîî-
age transformers use a single primary voltage tap.
BLUE YELLOW
ORANGE
RED
BLACK
230 VOLTS
208 VOLTS
PRIMARY
SECONDARY
FIGURE 3
4-Outdoor Fan Relay K10, K68
î˛îîîîîîîîîîîîîîîîîîîŽîîîîîîîîŽîîîîîîîî§îłî§îˇîîîîîîîîîîîîîîî
îîîšî¤îŚîîîîîîîîŹîîîîîîîîîîîîîîîîîîîîîó°ŠîîîîîîîîîîîîîîîŽîîîîîîî
îŽîîîîîîîîîîîîîîîîîîîîîîîîîîîîĽîîîîîîîĽîî
5-Outdoor Fan Capacitors C1, C2
îŠîîîîîîîîîîîîîîîŚîîîîîîîŚîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîî
îîî îîî îîîîîîîîîî îîîîî îĽîî îîîî îĽîîî îŚîîîîîîîîî îîîîî îîîîîîî
with unit tonnage and voltage.
îŻîŞîˇîîîîîîîîîîîîîîîîîîîîîîîîîîîšîîîîî°îŠî§
îŻîŞîˇîîîîîîîîîîîîîîîîîîîîîîîîî°îŠî§
îŻîŞîˇîîîîîîîîîŞîîîîîîîîîîîîšîîîîîîî°îŠî§
îŻîŞîˇîîîîîîîîîźîîîîîîîîîîîîšîîîîî°îŠî§
6-C. A. I. Transformers T3 575V Units
î¤îîîîŻîŞîˇîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîˇîîîîˇîîîîîîîî
îîîîîîîîîîîîîîîšî¤îŚîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîî
î
îîîî îˇîîî îîîîîîîîîîîî îîîî îîî îîîîîîî îîîîîîî îîî îîîî¤îî îˇîî
îîîîîîîîîîîî îîîîîîîîî îîîî îšî¤îŚî îîîîîî îîî îîîî
îîîîîîî îîîî
blower motor (B6).
7-Compressor Contactor K1, K2
î¤îîî îîîîîîîîîîî îîîîîîîîîîî îîîî îîîîîîîîîîîî îîîî
îîîî
îîîîî
contactors with 24VAC coils. K1 and K2 (both energized
î
îîî¤îîîîîîîîîîîîîîîîîîîîîîîîîîĽîîîîîîîĽîî
8-Burner Controls A3
A3 controls gas heat section burner controls. Burner con-
trols are factory set and are not adjustable. The control
makes three attempts at ignition and then locks out the
system if ignition is not obtained after the third trial. Reset
after lockout requires only breaking and remaking thermo-
îîîîîîîîîîîîîîˇîîîîîîîîîîîîîîîîîîó°¨îîîîîîîîîîîîîîîîîîîîî
in the event of a gas or power failure. Upon restoration
îîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîî îîîîîîîîîîîî îîîîîîîîîîî-
îîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîî
îîîîîîîîîîîîîîîîî
îîîîîî îîîîî îŠîîî îî îîîîî îîîîîîîîî îîîîîîîîîîîî îîîî îîîî îŞîîî
îŤîîîîîŚîîîîîîîîîîîîîîîîîî
9-Power Exhaust Relay K65 (PED units)
îłîîîîî îîîîîîîî îîîîîî îŽîîî îîî îî îąîî˛îî î§îłî§îˇî îîîîîî îîîîî îî
îîîšî¤îŚî îîîîîî îŽîîî îîî îîîîî îîî îîîî îŻîŞîˇî îîîîîî îîîîîîîîî îîîîî
îîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîîŽîîîîîîîîîîîîîîîîî
îî
îîîîîîîîîîîîîîîîîîîîîîîîîîîîîîî¤îîîîîîîîîîîîîîîîîîîîîîîîîî
îîîîîîîî îîîîîî îîîî îîîîî îîîîîîîîî
îîî îîî îŚî˛îľî¨îîî îşîîîî
îŽîîîîîîîîîîîîîîîîîîîîîîîîîîîîĽîîîîîîîîîîîîîîîîîîîî
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