274
The Boiler Control 274 is designed to stage multiple boilers using Outdoor Temperature Reset. It can be used in applications ranging from a single zone of baseboard, multiple baseboard and fan coil zones, to dedicated domestic hot water heating in commercial buildings. This control regulates a single heating water temperature through Outdoor Temperature Reset and/or setpoint/DHW target control. It is capable of controlling (stage and rotate) up to 4 on/off boilers as well as the system pump. Replacement option: 294 Smart Boiler Control, Four tN4, Four Boiler, DHW, Setpoint, Web/Mobile App Notification.
- Outdoor temperature reset, warm weather shut down
- Control up to 4 on-off boilers, primary pump sequencing (optional)
- DHW pump operation, DHW priority (optional)
- Equal run time rotation, automatic boiler differential
- Exercising, powered system pump output
- Optional boiler pump(s) operation, quick setup for easy installation and programming of control
- User comfort adjustment to increase or decrease building space temperature
- Advanced settings to fine-tune building requirements
- Test sequence to ensure proper component operation
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 |
Control Type | Microprocessor control, this is not a safety (limit) control |
Demand | 20 to 260 V (ac) 2 VA |
Dimensions | 6 5/8 IN H x 7 9/16 IN W x 2 13/16 IN D (170 x 193 x 72 MM) |
Enclosure Material | Blue PVC plastic |
Enclosure NEMA Rating | NEMA 1 |
Hydronic - HVAC Control Type | Boiler Control |
Power Supply | 115 V (ac) plus / minus 10 percent, 60 Hz, 7 VA, 1150 VA max |
Relay | 230 V (ac) 5 A, 1/3 hp |
Sensor | NTC thermistor, 10 k ohms at 77 degrees F (25 degrees C plus / minus 0.2 degrees C) Beta=3892 |