41
Sequence of Operation
•
Master / Slave switch:
Master
•
Pump Exercise:
OFF
•
Priority:
ON
•
AUX During Priority Demand:
OFF
•
Sec Pump Status During Zone 1 Demand
Jumper:
OFF
•
System Pump Status During Zone 1 Demand
Jumper:
ON
•
A demand occurs from a thermostat on zones
2-6 closing R to W. The “T-STAT CALL” LED
illuminates for the corresponding zone.
•
ZVR control sends 24 VAC to the corresponding
zone MOTOR terminals to open the zone
valve.
•
When the zone valve end switch closes,
the “VALVE OPEN” LED illuminates for the
corresponding zone. ZVR control sends 120
VAC to SYSTEM PUMP output. The control
will close the XX contacts to signal the boiler
of a demand.
•
When the thermostat demand is satisfied R
to W will open and the “T-STAT CALL” and
“VALVE OPEN” LEDs will turn off. 24 VAC is
dropped to the corresponding zone MOTOR
terminals.
•
If no other zones are calling for heat the XX
contacts will open terminating the demand for
heat to the boiler. The 120 VAC is dropped to
the SYSTEM PUMP.
•
If a demand occurs from the DHW aquastat
(T-STAT 1), the “T-STAT CALL” LED illuminates
for zone 1.
•
ZVR control sends 24 VAC to ZONE 1 MOTOR
terminals.
•
When the ZONE 1 zone valve end switch
closes, the “VALVE OPEN” LED illuminates for
ZONE 1.
•
If any other zone was calling for heat (zones
2-6) when zone 1 is calling 24 VAC is dropped
to those zone’s MOTOR terminals. The
“T-STAT CALL” and “VALVE OPEN” LED will
also turn off.
•
The XX contacts close to signal a demand to
the boiler.
•
The SYSTEM PUMP output delivers 120 VAC.
•
Once the DHW aquastat (T-STAT 1) is satisfied
it will open R to W and 120 VAC to the SYSTEM
PUMP is dropped. The XX contacts open.
•
If a call for heat exists from zones 2-6 the
corresponding “T-STAT CALL” will illuminate
again and 24 VAC will be delivered to their
zone MOTOR terminals.
•
When the zone valve end switch closes,
the “VALVE OPEN” LED illuminates for the
corresponding zone. ZVR control sends
120 VAC to SYSTEM PUMP and SEC PUMP
outputs. The control will close the XX contacts
to signal the boiler of a demand.
•
When all the thermostat demands are satisfied
R to W will open and the “T-STAT CALL” and
“VALVE OPEN” LEDs will turn off. The XX
contacts will open terminating the demand for
heat to the boiler. The 120 VAC is dropped to
the SYSTEM PUMP and SEC PUMP.
DHW Time Out \ Freeze Prevention Feature
•
After one hour of a priority demand, the
control will drop power to the ZONE 1 MOTOR
terminals.
•
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.
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.
Pump terminals
SYSTEM PUMP
= Runs when any zone calls for
heat.
SEC PUMP
= Runs when any zone calls for heat.
ZONE 1 PUMP
= Runs when zone 1 thermostat
calls for heat and zone 1 end switch has closed.
A jumper is required between the ZONE 1 END
SWITCH terminals when using a pump for ZONE
1 instead of a zone valve.
STATUS DURING ZONE 1 DEMAND ON / OFF:
When status jumper is placed on ON pins, the
secondary and / or system pump will continue to
operate during Zone 1 demand. When jumper is
placed on OFF pins, the corresponding pump will
be OFF during Zone 1 demand.
Valve terminals
Motor = 24 VAC to power the zone valve motor
End Switch = Connects to end switch on zone
valve. Must be jumped if using a 2–wire zone valve.
WARNING:
NEVER CONNECT R & C DIRECTLY,
this will be a direct short on the 24 VAC supply
Summary of Contents for Z-one ZSR103
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