CALEFFI Z-one ZSR10 Series - Page 31

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Sequence of Operation / Settings
• Master / Slave switch: Master
• Priority Switch: OFF
• Remote Enable Switch: OFF
• Exercise Switch: OFF
• Post Purge Zone 1 Switch: OFF
• Status During Priority Jumper: OFF
• A demand occurs from any thermostat closing
RtoW.The“PUMPON”LEDilluminatesfor
the corresponding zone.
• ZSR control sends 120 VAC to corresponding
zone pump and the primary pump output.
The control will close the XX contacts to signal
the boiler of a demand.
• 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.
• ALTERNATE WIRING: The boiler pump can be
controlled by the boiler if it is equipped to do
so.
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 (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.
P riority 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.