11
Sequence of Operation / Settings
•
A demand occurs from one of the thermostats
which sends power (from a separately sourced
transformer) to the corresponding zone valve.
•
When the zone valve opens the end switch
will close R to W on the ZSR101 control. The
“ZONE” LED illuminates.
•
The ZSR101 control will power relay #1 and
#2 closing C to NO.
•
The NO terminal of relay #1 will send out
120 VAC to your pump. Relay #2 provides
a dry contact closure to signal the boiler of a
demand.
•
NOTE
: Relay #1 can be used as a dry contact
as well by removing the factory installed
jumper between L and C.
•
When all the thermostat demands are satisfied
the zone valves will close and the end switch
will open R to W. The “ZONE” LED will turn
off.
•
The control will remove power from relays #1
and #2 opening C to NO. This will drop 120
VAC to your pump and terminate the demand
to your boiler.
WARNING:
NEVER CONNECT R & C DIRECTLY,
this will be a direct short on the 24 VAC supply
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
Summary of Contents for Z-one ZSR101 Series
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