WIRING THE ZONE DAMPER
For Duct Supplemental Heat
Applications
K1 = RELAY DPDT
W
Y
R
C
R
C
K1
DAMPER
MOTOR
B
K1 A
M
C
R
O
TO FIVE
WIRE
LINK
SAIL OR PRESSURE
SWITCH
MAKE AND BREAK
ELECTRIC HEAT
CIRCUIT
NOTE: CONTACT "K1 A" IS ONLY REQUIRED FOR DUCT
HEATER APPLICATIONS TO FORCE DAMPER TO THE
OPEN POSITION
Rd
G
Y
W
THERMOSTAT
1 STAGE COOL 2 STAGE HEAT
R
Y
W
1
W
2
C
K1 B
TO
A/C UNIT
OR FURNACE
G
R
Time
Clock
Switch
R
G
SWITCHING CENTER
OR
SYSTEM CONTROLLER
W
R
C
C
Y
T-STAT
TYPICAL SETBACK/SETUP WIRING FOR ALL
SWITCHING CENTERS AND SYSTEM CONTROLLERS
For continuous fan operation in the occupied mode and intermittent
operation during unoccupied periods, leave the System Controller/
Switching Center fan switch in the “ON” position.
Time Clock Switch:
Closed – Occupied
Open – Unoccupied
Transformer/fuse sizing:
The 24V transformer
connected to TR1 and TR2 of the Switching
Center/System Controller powers the zone
dampers, zone thermostats and Switching
Center/System Controller. The power rating of
the transformer must be sufficient to power
the number of dampers used. Also, a properly
rated in line fuse must be used on the secondary
of the transformer. To determine the power
rating of the transformer and the amperage
rating of the fuse, use the table above.
Note:
If using both spring open and power open
dampers, size as if all dampers are spring open.
TRANSFORMER / FUSE SIZING
APPLICATION SCHEMATICS
NUMBER
LOW PRESSURE
MED. PRESSURE/HEAVY DUTY
OF
(SPRING OPEN) DAMPERS
(POWER OPEN) DAMPERS
DAMPERS
XFMR PWR
FUSE SIZE
XFMR PWR
FUSE SIZE
1
12 VA
1 AMP
6 VA
1 AMP
2
24 VA
2 AMP
12 VA
1 AMP
3
36 VA
2 AMP
18 VA
1 AMP
4
48 VA
3 AMP
24 VA
2 AMP
5
60 VA
3 AMP
30 VA
2 AMP
6
72 VA
4 AMP
36 VA
2 AMP
7
84 VA
5 AMP
42 VA
3 AMP
8
96 VA
5 AMP
48 VA
3 AMP
9
108 VA
6 AMP
54 VA
3 AMP
10
120 VA
6 AMP
60 VA
3 AMP
11
132 VA
7 AMP
66 VA
4 AMP
12
144 VA
7 AMP
72 VA
4 AMP
13
156 VA
8 AMP
78 VA
4 AMP
14
168 VA
9 AMP
84 VA
5 AMP
15
180 VA
9 AMP
90 VA
5 AMP
16
192 VA
10 AMP
96 VA
5 AMP
17
204 VA
10 AMP
102 VA
5 AMP
18
216 VA
11 AMP
108 VA
6 AMP
19
228 VA
11 AMP
114 VA
6 AMP
20
240 VA
12 AMP
120 VA
6 AMP
42
