3
SCALE 1 :
1
Thermostat
Connect directly to R
terminal on backplate
IMPORTANT NOTE:
If a duct sensor is connected
to this thermostat, it
is suggested that the
fan be programmed for
continuous operation
(Setup Step #18, page
19
of the Owner’s Manual)
IEC relay board
24vac
24 volt
water
valves
Dry Contact
Duct Sensor
ACCDSEN
4-Pipe, Low Voltage Valves, Duct
Temperature Sensor & Dry Contact
RS
R
G
Y1
G3
W1
G2
C
H20
CK1
R
H
C
G3
G2
G
COM
R
C
WHITE
BLACK
C
H
C
L
Y2*
L2
L2
LO
W
ME
D
HI
GH
L1
CO
M
CO
M
LO
W
ME
D
CO
M
HI
GH
Wiring Diagram
* Y2 = 2
nd
Stage Cooling (Optional)
