York International ZQ Series Installation Manual page 55

Table 39: ETC board components
Location
D
E
F
G
H
I
J
K
L
M
N
O
Everyday Thermostat Control operation
Compressors are controlled by the Y1 through Y2
thermostat inputs.
Label
LPS1 Low Pressure Switch 1
HPS1 High Pressure Switch 1
LPS2 Low Pressure Switch 2
HPS2 High Pressure Switch 2
C1
C2
FAN 1
FAN 2
CN-FAN Condenser Fan Contactor
MV
H2
H1
VFD
C
FS1 Evaporator Freeze Stat
FS2 Evaporator Freeze Stat
PB1
LED
T1
T2
T3
2COMP Compressor Selection
1COMP Compressor Selection
ELEC
GAS
C
24V
LIMIT
Single Stage Cooling Configuration
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INSTALLATION MANUAL ZQ SERIES 3 - 5 ton 60 Hertz R-410A
Johnson Controls Ducted Systems
Description
If a unit is calling for compressor operation
and after the stabilization period expires,
LPS1 detects an open contact, the
compressor will stop and the anti-short
cycle delay will start.
If a unit is calling for compressor operation
and HPS1 detects an open contact, the unit
compressor will stop and the anti-short
cycle delay will start.
If a unit is calling for compressor operation
and after the stabilization period expires,
LPS2 detects an open contact, the
compressor will stop and the anti-short
cycle delay will start.(For units with 2-stages
of refrigeration)
If a unit is calling for compressor operation
and HPS2 detects an open contact, the unit
compressor will stop and the anti-short
cycle delay will start.(For units with 2-stages
of refrigeration)
1 Contactor Output to Compressor
2 Contactor Output to Compressor (2 stage units only)
Fan Contactor Output to Indoor Fan
No Connection
Output to Condenser Fan Contactor
Gas Valve Input (Gas units only)
H2 Output Stage 2 Gas/Electric Heat ContactorFor
H1 Output Stage 1 Gas/Electric Heat Contactor
VFD Output For use with Intellispeed OptionH1
For low evaporator temperature – Set for
26°F
For low evaporator temperature – Set
for 26°F (only used for dual compressor
operation)
Clears alarms and the stored alarms in
Push Button Reset
memory
LED Operation See the Fault Code table
Heat-Off-Delay 60 Seconds (Default)
Heat-Off-Delay 90 Seconds
Heat-Off-Delay 120 Seconds
2-Stage Compressor (default)
1-Stage Compressor
Electric Heat PowerSelection for Electric Heat (default)
Gas Heat PowerSelection for Electric Heat (default)
24VAC Power
24VAC Power
Shall be interlocked to the fan relay. (When
Limit switch
power is interrupted from this input, the fan
will be forced on by software)
When Y1 is energized the CN-FAN, FAN1,
and C1 outputs will energize, and the indoor
fan VFD will run at 67% speed. When Y2 is
energized, FAN2 output 2 will energize and
the VFD will run at 100% (but only if C1 is
"on").
Function and comments
55