Honeywell M8405 - Manual (Page 22)

SOLID STATE ECONOMIZER SYSTEM
63-2484—2 22
Fig. 29. W7212 used with M7215 Damper Motor and T7300 Thermostat.
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
ENSURE THAT TRANSFORMER IS SIZED TO HANDLE THE EXTRA LOAD OF THE ECONOMIZER AND ACTUATOR. USE THE SAME
TRANSFORMER FOR T7300 AND ECONOMIZER.
FACTORY INSTALLED 620 OHM, 1 WATT, 5% RESISTOR SHOULD NOT BE REMOVED. DIFFERENTIAL ENTHALPY NOT RECOMMENDED FOR USE
WITH SINGLE-STAGE COOLING SYSTEMS OR SINGLE-STAGE COOLING THERMOSTATS.
T7300 TERMINALS A1 AND A2 ARE CONNECTED WHEN THERMOSTAT IS IN THE OCCUPIED MODE.
EF AND EF1 ARE DRY CONTACTS IN THE LOGIC MODULE.
M20716D
S
1
2
3
2
+
4
5
5
C7400
OUTDOOR
AIR
ENTHALPY
SENSOR
L1
(HOT)
L2
FAN
HEAT 1
HEAT 2
COOL 1
HVAC EQUIPMENT
TERMINAL STRIP
T7300/Q7300
THERMOSTAT
1
C
G
W1
A2
A1
Y1
Y2
R
W2
RC
RH
G
X
W1
Y1
Y2
W2
A1
A2
COOL 2
N1
P1
T1
SR
SO
AQ
EF1
EXHAUST
FAN
L1
(HOT)
L2
4
EF
3
5
2 1
TR
MINIMUM POSITION
ADJUSTMENT
P
T
AQ1
SO+
SR+
TR1
24 Vac
COM 24 VAC COM
24
Vac
HOT
2-10 VDC CONTROL – +
3
620 OHM
RESISTOR
C7150B MIXED
AIR OR C7046A
DISCHARGE
AIR SENSOR
+
– 0/2-10 VDC
INDOOR AIR
SENSOR
N
4
24 VAC HOT
SIGNAL INPUT
W7212
M7215