274
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Discontinued - Replaced By: 294
Part of the Multi-Staging Controls Series
Ordering Code: 274
UPC: 779655027401
Boiler Control, One tN4, Four Stage Boiler and DHW, Setpoint
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.
Features
- 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 |