Description
The Boiler Control 275 is designed to stage up to four condensing or non-condensing, modulating or on-off boilers using P.I.D. staging to accurately maintain temperature. Water temperature is controlled by Outdoor Temperature Reset for space heating applications or a fixed setpoint for Domestic Hot Water (DHW) tank heating or industrial process heating applications. The control will also accept an analog 0-10 V (dc) signal from an Energy Management System (EMS) to control the water temperature. Boiler Equal Run Time Rotation, pump exercising and stand-by system pump operation increase boiler plant reliability. The control is tekmarNet® communication compatible allowing for internet connectivity using an optional Gateway 483.
Features
- Warm weather shut down, automatic boiler differential
- Control up to 4 modulating or on/off boilers, primary pump sequencing
- Outdoor temperature reset, programmable schedules
- tekmarNet 4 compatible, condensing & non-condensing boiler groups
SPecs
| 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, 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 |
| Modulating Output | 0 - 10 V (dc), Minimum 2500 ohms |
| 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 |
