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1- The A55 Unit Controller energizes the thermostat components with 24VAC via J/P297-1.
2- The A55 Unit Controller proves the optional N.O. filter switch S27 (indicates dirty filter when closed) and optional
N.O. air flow switch S52 (indicates no air [i.e. broken belt] system shuts down).
3- The A55 Unit Controller receives data from the supply and return smoke detectors A171 and A172, blower motor
overload relay S42, discharge sensor RT6 and return air sensor RT16.
4- The A55 Unit Controller receives data from the electronic thermostat A2 (Y1, Y2, W1, W2, G, OCP)
and the CO
2
sensor A63 (if economizer is used). A55 energizes the appropriate components.
ACCESSORIES
REV. 3
F/A
1
3
P298-8 (DO-1) IS SERVICE RELAY OUTPUT (24VAC)
IF USED CONNECT TO AN INDICATOR LIGHT
FOR MOTORS WITH S42 EXTERNAL OVERLOAD LESS
INVERTER, SEE INVERTER WITH BY PASS FOR S42 HOOK UP
REMOTE LOCATION OF RT6
DESCRIPTION
KEY COMPONENT
A2
SENSOR, ELECTRONIC THERMOSTAT
A24
CONTROL, OUTDOOR AIR CFM FLOW
A34 DIFFERENTIAL PRESSURE TRANSDUCER
A55
A63
SENSOR, CO2 (IAQ) OPTIONAL
A91
SENSOR, HUMIDITY
A171
SENSOR ONE, SMOKE, RETURN AIR
A172
SENSOR TWO, SMOKE, SUPPLY AIR
A173
MODULE, CONTROL SMOKE DETECTION
J99
JACK, RT16 RETURN AIR SENSOR
J100
JACK, RT6 SUPPLY AIR SENSOR
J250
JACK, SMOKE DETECTOR ONE
J251
JACK, SMOKE DETECTOR ONE
J252
JACK, SMOKE DETECTOR TWO
J253
JACK, SMOKE DETECTOR TWO
J255
JACK, MODULE, CONTROL SMOKE
DETECTION
J261
JACK, SUPPLY SMOKE DETECTOR JUMPER
J262
JACK, ECONOMIZER
J264
JACK, BLOWER DECK
J297
JACK, THERMOSTAT * DDC INTERFACE
J298
JACK, IAQ INTERFACE
J299
JACK, SAFETY INTERFACE
K27, *1 RELAY, TRANSFER
K55,*1 RELAY, BLOWER
K222,
*1
RELAY, COMPRESSOR LOCKOUT
P99
PLUG, RT16 RETURN AIR SENSOR
P100
PLUG, RT6 SUPPLY AIR SENSOR
P250
PLUG, SMOKE DETECTOR ONE
P251
PLUG, SMOKE DETECTOR ONE
P252
PLUG, SMOKE DETECTOR TWO
P253
PLUG, SMOKE DETECTOR TWO
P255
PLUG, MODULE, CONTROL SMOKE
DETECTION
P262
PLUG, ECONOMIZER
P264
PLUG, BLOWER DECK
P297
PLUG, THERMOSTAT * DDC INTERFACE
P298
PLUG, IAQ INTERFACE
P299
PLUG, SAFETY INTERFACE
P304
PLUG, SYS BUS
RT6
SENSOR, SUPPLY AIR TEMP
RT16
SENSOR, RETURN AIR TEMP
S27
SWITCH, FILTER
S52
SWITCH, AIRFLOW
S42
SWITCH, OVERLOAD RELAY BLOWER MOTOR
S86
SWITCH, DEHUMIDISTAT
S149
SWITCH, OVERFLOW ONE
S179
SWITCH, OVERFLOW TWO
T8
TRANSFORMER, 120 V GENERATOR POWERED
CONTROL BOARD, MAIN
K27
A
B
A2
Y1
Y2
Y3
K27*1
1
7
TO PROVIDE THREE
COMPRESSOR STAGES.
REQUIRES 3 HEAT, 3
COOL THERMOSTAT
AND K27 RELAY.
K55
B
A
K55*1
7
5
2
S86
J264A
1
2
J262B
5
6
RT6
RT6
RT16
3
A172
J253
A173
P255
P255
J250 J252
P250 P252
P253
J255
1 6 34
J255
2
S42
1
J262C
10
11
12
P297
P298
J298A
1
2
B
3
4
C
5
6
7
P299
D
8
9
10
J299A
1
2
3
B
4
5
C
6
7
10
J100
1
4
P100
J99
1
4
P99
D
8
9
J297A
1
2
B
3
4
5
6
7
8
C
9
10
A91
VO
VIN
GND
J299A
1
2
J297A
7
6
2
R
OCP
C
G
W1
W2
Y1
Y2
24 V COMMON
24 V POWER
4
4
S52
S27
J264C
6
7
8
USE S86 DEHUMIDISTAT AND K55 FOR OPTIONAL
SUPERMARKET REHEAT SCHEME, PRODIGY PARAMETERS NEED
TO BE MODIFIED UNDER THE SETTINGS MENU OR VIA UC
SOFTWARE FOR SIMULTANEOUS HEATING AND COOLING.
2
THERMOSTAT HOOKUP FOR PROGRAMMABLE CONFIGURATION
OF THE BOARD (A55).
5
5
6
W1
W2
P262
P262P264C
R
C
AI*1
HUM
TMP
DO*1
C
DO*2
DI*1
R
C
DI*2
R
DI*3
R
DI*4
C
A55
P304
PRODIGY SETTINGS MUST BE MODIFIED WHEN K222, S42,
S52, S149 OR S179 ARE INSTALLED
A171
J251
P251
J261
1
2
3
4
7
CONNECT A172 SENSOR TO J261 ON SUPPLY AIR SMOKE
DETECTOR ONLY
7
R
OCP
C
G
W1
W2
Y1
Y2
TO R
TO G
TO Y1
TO PROVIDE SUPERMARKET REHEAT SCHEME
USE S86 DEHUMIDISTAT AND K55.
ALL OTHER THERMOSTAT
SIGNALS REMAIN CONNECTED
AS SHOWN ON THE RIGHT.
TO M3 THERMOSTAT INPUTS
2
2
DI1
R
M3
K222*1
T8
120VAC
K222
A
B
TO PROVIDE COMPRESSOR
SHUT OFF, 120 VAC
PROVIDED BY GENERATOR
S149
6
S179
8
8
S179, OVERFLOW SWITCH USED ON LGH/LCH 420-600 UNITS
ONLY
1
+ EXC
GND
+SIG
A34
2
3
J298A
B
1
2
3
J298A
B
1
2
3
A24
9
9
A63
J298A
1
2
B
3
4
9
9 A63, A34 & A24 ARE MUTUALLY EXCLUSIVE
1
2
3
J298A
B
1
2
3
A24
9
6
J26
3
P26
2
1
10
FACTORY INSTALLED OPTION FOR LGH/LCH 242-600 UNITS
ONLY
10
P26
PLUG, AIR FLOW CONTROL
J26
JACK, AIR FLOW CONTROL
S135
OVERLOAD, BLOWER MOTOR SUPPLY
S135
ELECTRONIC OR ELECTROMECHANICAL THERMOSTAT
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