374 | Universal Reset Control - Two Mixing, Two Stage Boiler, DHW & Setpoint | Tekmar

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Overview

Details for 374

Universal Reset Control - Two Mixing, Two Stage Boiler, DHW & Setpoint

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

Item Number	374
Brand	Tekmar
Category	Heating Controls
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