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PI-PR-520949 0212 (Pump and Boiler Relay)
Product
Instructions
1 of 3
The Viega LLC Pump and Boiler Relay provides power to
circulators and can enable a boiler as well. Control may be
provided from a Viega Zone Control or Thermostat.
Features
• External Indicator Lights
• Universal Replaceability
• Snap-in PC Board
• Simple Wiring
• Sealed Relays
• Fuse Protected Outputs
• 100% Factory Tested
• Contractor Friendly PC Board Layout
• Universal Zone Control and Thermostat Compatibility
• UL Approved
Specifications
Transformer Voltage:120 VAC input
Input Voltage: 120/60/1 VAC
Maximum Combined Load: 12 Amps
Relay Connections: 1/3 hp ( 6FLA, 36 LRA )@ 120 vac
Thermostat Connection: 24 VAC Class 2 Output
Installation
Wiring connections must be made in accordance with all
applicable electrical codes. Use copper wire only. Failure to
follow this instruction can result in personal injury or death and/
or property damage. 12-18 gauge wire recommended for all 120
VAC connections with 9 in. lbs. max torque, 14-22 gauge wire for
thermostat connections with 9 in. lbs. max torque. 120VAC wiring
must have a minimum temperature rating of 75°C.
Jumper placement:
The jumper is factory installed between terminals H and 3 to
switch power on terminals 4 n/o and 4 n/c.
Operation
There are four common ways to connect the Pump and Boiler
Relay:
Wiring Diagram #1 Viega Digital Thermostat
(stock code 18050):
From the thermostat connect the R, W and C terminals to the
corresponding R, W and C terminals on the zone control. When
the thermostat calls for heat, the relay in the zone control is
energized and power is supplied to the circulator.
(R=R, W=W, C=C)
Wiring Diagram #2 Viega analog style thermostat
(stock code 18029, 18031):
From the thermostat connect the L terminal to the R terminal on
the zone control, connect the to the W terminal on the zone
control, and connect the N to the C terminal on the zone control.
When the thermostat calls for heat, the relay in the zone control
is energized and power is supplied to the circulator.
(L=R, =W, N=C)
Wiring Diagram #3 Zone Control:
Connect pump relay contacts of Zone Control to “T T” terminals
on the relay. When the Zone Control calls for heat, the relay is
energized and power is provided to the circulator (and/or dry
contact to the boiler).
Wiring Diagram #4 With 2-Wire Thermostat:
Connect a 2-wire thermostat to the “T T” terminals on the
relay. When the thermostat calls for heat, the relay is energized
and power is provided to the circulator (and/or dry contact to
the boiler).
Dimensions
Width 4-7/8"
Height 5-5/8"
Depth 2-3/8"
Troubleshooting
The external indicator lights show full functionality of the Pump
and Boiler Relay. The green light should always be on, indicating
that power is connected. If the green light is out check the
power connections at terminals N and H.
The red light shows a call for heat, indicating that power is
being supplied to the circulator (and/or a boiler enable signal is
provided).
If the Zone Control or thermostat is calling for heat but the red
light is out, check the thermostat wiring. If the red light is on but
the circulator is not running, check the circulator connection to
the relay.
Pump and Boiler Relay
