Honeywell Design and Application Technical Reference Manual page 119

2
MA TEMP
SENSOR
20K NTC
MA
MA
S-BUS
S-BUS
IAQ (2-10V)
CO2
SENSOR IAQ COM
2-10 VDC
IAQ 24V
(OPTIONAL)
ACT (2-10V)
ACT COM
ACT 24V
MS7503 OR MS7505
3
1
Fig. 9. Economizer with Sylk Bus sensors for enthalpy configuration with a Honeywell
W7220 ECONOMIZER CONTROLLER MODULE
OUTSIDE AIR
TEMP/HUMIDITY (ENTHALPY)
SYLKBUS SENSOR
RETURN AIR
TEMP/HUMIDITY (ENTHALPY)
SYLKBUS SENSOR
MS7503 or MS7505 Direct Coupled Actuator.
Section 11 - W7220 JADE™ Economizer Module
24 VAC
1 IN THIS CONFIGURATION, AN OPTIONAL DISCHARGE AIR TEMP/HUMIDITY
(ENTHALPY) SYLKBUS SENSOR CAN BE ADDED FOR ADVANCED CONTROL AS
SHOWN IN THE LOWER LEFT OF THIS FIGURE.
2 DO NOT USE THE C7250 20K NTC SENSOR
CONFIGURATION.
3 WHEN USING A HEAT PUMP THERMOSTAT, THERMOSTAT TERMINALS MAY DIFFER:
W1 MAY BE LABELED O OR B AND W2 MAY BE LABELED W.
4 WHEN USING A HEAT PUMP WITH DEFROST FEEDBACK, ADD AN ISOLATION
RELAY BETWEEN O AND C.
113
ROOF TOP UNIT
O/B Y1 W1
OCC Y2
4
1K1
AUX2-I
OCC
E-GND
AUX1-0
Y2I
Y2O
Y1I
Y1O
1K1
C R
R(+)
C(-)
3
THERMOSTAT
WITH THE OA TERMINAL IN THIS
Honeywell Economizers 63-8594-02
G
W2
M32566C