21
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
satisfied 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.
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.
Summary of Contents for Z-one ZSR103
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