25
Sequence of Operation / Settings
•
Master / Slave switch:
Master
•
Priority Switch:
OFF
•
Remote Enable Switch:
ON
•
Exercise Switch:
ON
•
Post Purge Zone 1 Switch:
OFF
•
Status During Priority Jumper:
OFF
•
A demand occurs from any thermostat closing
R to W.
•
ZSR control closes XX contacts to signal the
boiler of a demand. Boiler receives demand
and fires. Boiler control sends 120 VAC to
boiler pump output.
•
ZSR control receives 120 VAC at REMOTE
ENABLE terminals from boiler pump output.
The “PUMP ON” LED illuminates for the
corresponding zone. ZSR control sends 120
VAC to corresponding zone pumps and the
primary pump output.
•
NOTE
: Boilers equipped with a warm weather
shutdown feature will not power the boiler
pump output if outdoor temperature is above
the warm weather shutdown setpoint. In this
case the ZSR control will not receive 120 VAC
at the REMOTE ENABLE terminals. Without
power (24 – 120 VAC) at the REMOTE ENABLE
terminals the ZSR control will not send 120
VAC to any pumps wired to the ZSR control.
•
NOTE:
The REMOTE ENABLE terminals are
only using the power applied to them as a
signal to allow the pumps wired to the ZSR
control to operate. The power applied to
the REMOTE ENABLE terminals is not used
to power any of the pumps wired to the ZSR
control.
Description of terminals
= Ground
N
= Neutral (Common leg of 120 VAC)
L
= Line (Hot leg of 120 VAC)
Thermostat terminals
R = 24 VAC
W = Heat call
C = Common of 24 VAC
Boiler terminals
XX
= Dry contact rated up to 120 VAC, 2 Amps,
which is typically connected to TT on boiler control,
closes when any zone calls including priority.
ZONE 1 E/S
= Dry contact rated up to 120 VAC, 2
Amps, will close with any call to ZONE 1. Zone 1
can be enabled as a priority zone, typically used for
heating domestic hot water. The ZONE 1 E/S can
be used to close a DHW contact on boiler controls
equipped with these features.
AUX
= Dry contact,
rated up to 120 VAC, 2 Amps, close when any zone
calls and can be used
as signal to a variable speed
self regulated pump or other controls.
Dip switch description
Master / Slave:
allows for unlimited expansion to
additional ZVR or ZSR relays. Only one Master.
Priority ON / OFF:
When priority switch is ON, upon
demand to TSTAT 1, ZONE 1 will operate as priority and
all other zones are temporarily switched off (with 1 hour
time-out). When priority is OFF, any zones that were
active when ZONE 1 was switched on will remain on.
Remote Enable ON / OFF:
When remote enable
mode is ON, the board will hold off all zones waiting
for an external 24 - 120 VAC voltage from the boiler.
Exercise ON / OFF:
When exercise mode is ON,
each circulator is switched on for 30 seconds
following 72 hours of inactivity.
Post Purge Zone #1 ON / OFF:
When post purge is
ON, Zone 1 pump continues operating for 2 minutes
after the priority zone is switched OFF.
WARNING:
NEVER CONNECT R & C DIRECTLY,
this will be a direct short on the 24 VAC supply
•
When the demand from the last thermostat
calling is satisfied (thermostat opens R to W),
the XX contacts are opened and the “PUMP
ON” LED turns off. The 120 VAC to the zone
pump and primary pump outputs are dropped.
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