CALEFFI Z-one ZSR10 Series - Page 29

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Sequence of Operation / Settings
• Master / Slave switch: Master
• Priority Switch: ON
• Remote Enable Switch: OFF
• Exercise Switch: OFF
• Post Purge Zone 1 Switch: OFF
• Status During Priority Jumper: OFF
• A demand occurs from a thermostat on zones
2-6 closing R to W.  The “PUMP ON” LED
illuminates for the corresponding zone.
• ZSR control sends 120 VAC to corresponding
zone pump. The control will close the X X
contacts to signal the boiler of a demand. The
PRIMARY PUMP output will also deliver 120
VAC even if no pump is wired to it.
• When the demand from the thermostat is
satisedRtoWwillopenandthe“PUMPON”
LED for the corresponding zone will turn off.
• 120 VAC is dropped to the corresponding
zone pump terminals.
• If no other zones are calling for heat, 120 VAC
is dropped to the PRIMARY PUMP and the XX
contacts will open terminating the demand for
heat to the boiler.
• If a demand occurs from the DHW aquastat
(T-STAT1),the“PUMPON”LEDilluminatesfor
zone 1.
• If any other zone was calling for heat (zones
2-6) when zone 1 is calling 120 VAC is dropped
to the pumps on zones 2-6.
• The X X and the ZONE 1 E/S contacts close
to signal a DHW demand to the boiler.
• The PRIORITY PUMP 1 output delivers 120
VAC.
• Once the DHW aquastat (T-STAT 1) is satisfied
it will open R to W and 120 VAC to PRIORITY
PUMP 1 is dropped. The ZONE 1 E/S contacts
open.
• If a call for heat exists from zones 2-6 the
corresponding“PUMPON”LEDwillilluminate
and 120 VAC will be delivered to those zone
pumps. The XX contacts will remain closed to
signal a heating demand to the boiler.
• When all the thermostat demands are satisfied
RtoWwill open and the “PUMPON”LEDs
will turn off. The X X contacts will open
terminating the demand for heat to the boiler.
The 120 VAC is dropped to all of the zone
pumps.
DHW Time Out \ Freeze Prevention Feature
• After one hour of a priority demand, the control
will open the ZONE 1 E/S contacts and drop
power to PRIORITY PUMP 1.
• If a call for heat exists from zones 2-6, the
control will satisfy those demands before
going back to the priority demand.
• After zones 2-6 have been satisfied, the
control will go back to the priority demand and
reset the one hour timer.
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.