The Universal Reset Control 374 is designed to operate all of the mechanical equipment in a residential hydronic heating system. It can be used in applications ranging from a single zone of baseboard with an on/off boiler to multiple fan coils, low temperature staple up zones, low temperature in-slab radiant zones, domestic hot water, and 2 on/off boilers. It regulates up to three space heating water temperatures through Outdoor Temperature Reset. It is capable of controlling up to 2 on/off boilers, up to 2 mixing devices (either variable speed pumps or floating action mixing valves), and Domestic Hot Water or setpoint loads.
Features
- DHW pump or valve operation, DHW priority (optional)
- 3 Outdoor temperature reset controlled water temperatures, control up to 2 on/off boilers
- Equal run time rotation, 2 X variable speed pump outputs or 2 X floating action mixing outputs
- Quick setup for easy installation, user comfort adjustment to increase or decrease building space temperature
- Boiler load reset, automatic boiler differential
- Outdoor temperature reset, warm weather shut down
- CSA C US certified (approved to applicable UL standards)
- Advanced settings to fine-tune building requirements, test sequence to ensure proper operation
- Powered boiler system and mixing system pump outputs, exercising
| Specifications | |
|---|---|
| Agency Approvals | CSA C US, meets Class B: ICES & FCC Part 15 |
| Ambient Conditions | Indoor use only, 32 to 122 degrees F (0 to 50 degrees C), RH less than or equal to 90 percent Non-condensing, Altitude less than 6560 ft. (2000 m), Installation Category II, Pollution Degree 2 |
| Control Type | Microprocessor control, this is not a safety (limit) control |
| Demand | 20 to 260 V (ac) 2 VA |
| Dimensions | 6-5/8" H x 7-9/16" W x 2-13/16" D (170 x 193 x 72 mm) |
| Enclosure Material | Blue PVC plastic |
| Enclosure NEMA Rating | NEMA 1 |
| Hydronic - HVAC Control Type | Universal Reset Control |
| Power Supply | 115 V (ac) plus / minus 10 percent, 50/60 Hz, 1750 VA |
| Relay | 230 V (ac) 5 A, 1/3 hp, pilot duty 240 VA |
| Sensor | NTC thermistor, 10 k ohms at 77 degrees F (25 degrees C plus / minus 0.2 degrees C) Beta=3892 |
| Variable Pump | 230 V (ac) 2.4A 1/6 hp, fuse T2.5 A 250 V |
| Zone Valve Load | 89 VA, 24 V (ac), 3.7 A for zones 1 to 4 |