7
Sequence of Operation / Settings
•
A demand occurs and closes RW (TT)
•
Relay #1 and relay #2 both fire connecting the
common terminal to the NO terminal.
•
If the factory installed jumper has not been
removed, the NO terminal of relay #1 will
deliver the hot leg of 120 VAC. Relay #2 has
dry contacts.
•
The zone LED illuminates.
•
The demand is satisfied and opens RW (TT).
•
The relay contacts return to their normal
position (common to normally closed).
•
The zone LED turns off.
Description of terminals
= Ground
N
= Neutral (Common leg of 120 VAC)
L
= Line (live leg of 120 VAC)
C
= Common terminal
NO
= Normally Open terminal
NC
= Normally Closed terminal
Note: There is a factory installed jumper between the 120
VAC line (L) and the common terminal of relay #1 (C).
Thermostat terminals
R = 24 VAC
W = Heat call
C = Common of 24 VAC
WARNING:
NEVER CONNECT R & C DIRECTLY,
this will be a direct short on the 24 VAC supply
