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IMPORTANT: The default setting on the W7220 controller is
for a "Fan Type" with 2 speed, which is correct for 2 or 3 speed
units (48/50LC 14-26). If your unit is 1 (single) speed, the
setting under SYSTEM SETUP > FAN TYPE must be changed
to 1 speed.
MA TEMP
SENSOR
20K NTC
1
MAT
MAT
OAT TEMP
OAT
SENSOR
OAT
20K NTC
CO2
IAQ (2-10V)
SENSOR
IAQ COM
2-10 VDC
IAQ 24V
(OPTIONAL)
ACT (2-10V)
ACT COM
ACT 24V
1
2
MS3103J
3
S-BUS
OR MS3105J
S-BUS
4
5
NOTE THAT THE 20K NTC SENSOR CAN BE MOUNTED IN THE OAT TERMINALS ONLY IN THIS
1
2
WHEN USING A HEAT PUMP THERMOSTAT, THERMOSTAT TERMINALS MAY DIFFER: W1 MAY BE LABELED O OR B AND W2 MAY BE LABELED W.
3
WHEN USING A HEAT PUMP WITH DEFROST FEEDBACK, ADD AN ISOLATION RELAY BETWEEN O AND C.
WIRING W7220 FOR EXHAUST AND FAULT ALARM
W7220 ECONOMIZER CONTROLLER MODULE
Fig. 32 — Wiring W7220 Controller for Exhaust and Fault Alarm
The W7220 controller provides the following:
•
2-line LCD interface screen for setup, configuration and
troubleshooting
•
On-board fault detection and diagnostics
•
Sensor failure loss of communications identification
•
Automatic sensor detection
•
Capabilities for use with multiple-speed indoor fan
systems
See Fig. 32 for wiring the W7220 controller for exhaust and fault
alarm.
ROOF TOP UNIT
Y1
O/B
OCC
Y2
3
1K1
AUX2-I
OCC
E-GND
EXH1
AUX1-0
Y2I
Y2O
Y1I
Y1O
C R
1K1
R(+)
24 VAC
C(-)
2
THERMOSTAT
CONFIGURATION.
14
W1
G
W2
EXHAUST
24VAC
24VAC
C
ANNUNCIATION –
LIGHT OR OTHER
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