Caleffi ZVR104 Relay
The Caleffi ZVR104 is a professional-grade 4-zone valve relay designed for precise control of hydronic heating systems. Serving as a direct HPZC104 replacement, this multi-zone controller manages up to four zone valves and features priority zoning functionality, allowing a single zone to be designated for domestic hot water (DHW) production. Engineered with a multi-pin selectable priority option, the ZVR104 ensures that space heating loads are temporarily suspended to satisfy high-demand DHW calls. The unit includes a high-capacity 24V transformer capable of powering multiple 2-wire or 4-wire zone valves, including those with end switches. The enclosure provides organized wiring terminals for dry contact inputs, 120V pump outputs, and thermostat connections, streamlining installation for zoning system troubleshooting or full-scale mechanical room builds. This relay is compatible with most standard thermostat brands and is built to withstand the rigors of continuous boiler control wiring applications.
- Universal Compatibility: Works with 2, 3, or 4-wire zone valves and operates as a drop-in HPZC104 replacement.
- Selectable Priority: Configurable priority timing prevents simultaneous heating and DHW cycles to optimize system efficiency.
- LED Diagnostics: External indicator lights allow for rapid zone valve relay status checks and circuit troubleshooting without opening the panel.
- Expandable Design: Features easy-to-access terminals for master/slave expansion if more than four zones are required.
- High-Capacity Power: Includes a robust 40VA transformer to handle the continuous current draw of motorized valve actuators.
Common Technical Questions
How do I wire a 4-wire zone valve to the ZVR104?
Connect the two motor wires to the '24V' and 'COM' terminals and the two end switch wires to the corresponding 'ES' terminals for proper pump sequencing.
Can this relay control a primary system pump?
Yes, the ZVR104 includes dedicated dry contacts and 120V outputs to trigger the primary boiler pump or a secondary circulator upon zone call.
Is the ZVR104 compatible with power-stealing thermostats?
Yes, the internal circuitry is designed to handle the requirements of modern smart thermostats that require a constant C-terminal connection or draw power through the relay.
This item is not eligible for free shipping.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
Original: $179.57
-65%$179.57
$62.85Caleffi ZVR104 Relay
The Caleffi ZVR104 is a professional-grade 4-zone valve relay designed for precise control of hydronic heating systems. Serving as a direct HPZC104 replacement, this multi-zone controller manages up to four zone valves and features priority zoning functionality, allowing a single zone to be designated for domestic hot water (DHW) production. Engineered with a multi-pin selectable priority option, the ZVR104 ensures that space heating loads are temporarily suspended to satisfy high-demand DHW calls. The unit includes a high-capacity 24V transformer capable of powering multiple 2-wire or 4-wire zone valves, including those with end switches. The enclosure provides organized wiring terminals for dry contact inputs, 120V pump outputs, and thermostat connections, streamlining installation for zoning system troubleshooting or full-scale mechanical room builds. This relay is compatible with most standard thermostat brands and is built to withstand the rigors of continuous boiler control wiring applications.
- Universal Compatibility: Works with 2, 3, or 4-wire zone valves and operates as a drop-in HPZC104 replacement.
- Selectable Priority: Configurable priority timing prevents simultaneous heating and DHW cycles to optimize system efficiency.
- LED Diagnostics: External indicator lights allow for rapid zone valve relay status checks and circuit troubleshooting without opening the panel.
- Expandable Design: Features easy-to-access terminals for master/slave expansion if more than four zones are required.
- High-Capacity Power: Includes a robust 40VA transformer to handle the continuous current draw of motorized valve actuators.
Common Technical Questions
How do I wire a 4-wire zone valve to the ZVR104?
Connect the two motor wires to the '24V' and 'COM' terminals and the two end switch wires to the corresponding 'ES' terminals for proper pump sequencing.
Can this relay control a primary system pump?
Yes, the ZVR104 includes dedicated dry contacts and 120V outputs to trigger the primary boiler pump or a secondary circulator upon zone call.
Is the ZVR104 compatible with power-stealing thermostats?
Yes, the internal circuitry is designed to handle the requirements of modern smart thermostats that require a constant C-terminal connection or draw power through the relay.
This item is not eligible for free shipping.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
Product Information
Product Information
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Description
The Caleffi ZVR104 is a professional-grade 4-zone valve relay designed for precise control of hydronic heating systems. Serving as a direct HPZC104 replacement, this multi-zone controller manages up to four zone valves and features priority zoning functionality, allowing a single zone to be designated for domestic hot water (DHW) production. Engineered with a multi-pin selectable priority option, the ZVR104 ensures that space heating loads are temporarily suspended to satisfy high-demand DHW calls. The unit includes a high-capacity 24V transformer capable of powering multiple 2-wire or 4-wire zone valves, including those with end switches. The enclosure provides organized wiring terminals for dry contact inputs, 120V pump outputs, and thermostat connections, streamlining installation for zoning system troubleshooting or full-scale mechanical room builds. This relay is compatible with most standard thermostat brands and is built to withstand the rigors of continuous boiler control wiring applications.
- Universal Compatibility: Works with 2, 3, or 4-wire zone valves and operates as a drop-in HPZC104 replacement.
- Selectable Priority: Configurable priority timing prevents simultaneous heating and DHW cycles to optimize system efficiency.
- LED Diagnostics: External indicator lights allow for rapid zone valve relay status checks and circuit troubleshooting without opening the panel.
- Expandable Design: Features easy-to-access terminals for master/slave expansion if more than four zones are required.
- High-Capacity Power: Includes a robust 40VA transformer to handle the continuous current draw of motorized valve actuators.
Common Technical Questions
How do I wire a 4-wire zone valve to the ZVR104?
Connect the two motor wires to the '24V' and 'COM' terminals and the two end switch wires to the corresponding 'ES' terminals for proper pump sequencing.
Can this relay control a primary system pump?
Yes, the ZVR104 includes dedicated dry contacts and 120V outputs to trigger the primary boiler pump or a secondary circulator upon zone call.
Is the ZVR104 compatible with power-stealing thermostats?
Yes, the internal circuitry is designed to handle the requirements of modern smart thermostats that require a constant C-terminal connection or draw power through the relay.
This item is not eligible for free shipping.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
