When a zone has a demand from
a thermostat (T T / R W) the
control will send 24 VAC to the
corresponding zone valve. When
the zone valve end switch closes,
the system and secondary pump
will switch on and the (X X) dry
contact will close to signal the boiler of a heating demand. AUX dry contact will also close as a
signal to a variable speed self regulated pump or other controls. ZONE 1 can be used for priority
(either a priority pump or valve). When the priority dip switch is ON, a demand from T-STAT 1 will
activate 24VAC to VALVE 1 and the ZONE 1 pump relay, 120 VAC will switch on after the end switch
closes (requires a jumper in the end switch terminals if a valve is not used). The DHW (ZONE 1) dry
contact will also close.
Depending upon "Status During Zone 1 Demand" jumpers, the secondary and / or system pump
will either be ON or OFF.
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.
XX = Dry contact rated up to 120 VAC, 2 Amps, which is typically
connected to T T on boiler control, closes when any zone calls including
priority. ZONE 1 / ES (DHW) = Dry contact, rated up to 120 VAC, 2
Amps, close with any call to ZONE 1. When priority is enabled and ZONE
1 is calling, it is typically used to close 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. When there is a priority demand, then AUX will follow the selection of the AUX dip switch.
The ZVR series of controls is programmed by
positioning four dip switches for the following
operations.
Master / Slave: allows for unlimited expansion to
additional ZVR or ZSR relays boards.
Pump Exercise ON / OFF: When exercise mode is
ON, each circulator is switched on for 30 seconds
following 72 hours of inactivity.
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.
AUX ON / OFF: When AUX switch is ON, AUX dry contact is activated with a demand to any zone
including priority. When AUX is OFF, AUX dry contact is activated during any demand except priority.
L
ZONE #1
PUMP
N
L
SEC
PUMP
N
STATUS DURING
ZONE #1 DEMAND
L
SYSTEM
PUMP
N
0
/
0
'
'
0
/
0
'
'
MASTER
PUMP EXERCISE ON
PRIORITY ON
AUX ON
SLAVE
OFF
OFF
OFF
DURING PRIORITY DEMAND
Dip switch settings
ZONE 1
E / S
XX
AUX
Boiler Connections
T-STAT 2
C
R
W
TTCOM
T-STAT 3
C
R
W
T T COM
T-STAT 1
C
R
W
T T COM
T-STAT 4
C
R
W
T T COM
Thermostats
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