tekmar Universal Reset Module 422

Universal Reset Module 422

Control Description The Universal Reset Module 422 provides outdoor reset to a hydronic heating system in order to maximize comfort and efficiency. The 422 can operate a single on / off boiler or a single modulating boiler. The 422 can override the outdoor reset water temperature to provide Domestic Hot Water or Setpoint operations. The 422 can operate two outdoor reset water temperatures, either one boiler water temperature and a single mix water temperature, or two mix water temperatures. To operate two mixing devices, a Mixing Expansion Module must be connected to the 422. The single mix output can operate a floating action mixing valve or a variable speed injection pump.

Control	—	Microprocessor PID control; This is not a safety (limit) control
Packaged Weight	—	1.9 lb. (1638 g)
Dimensions	—	3-5/8" H x 5-3/8" W x 9/16" D (92 x 137 x 14 mm)
Approvals	—	CSA C US, CSA/UL 61010-1, meets Class B: ICES and FCC Part 15
Ambient Conditions	—	Indoor use only, 32 to 122°F (0 to 50°C).
	—	RH equal to or less than 80% to 88°F (31°C), down to 50% from 104 to 122°F (40 to 50°C)
	—	Altitude <2000 m, Installation Category II, Pollution Category 2
Power Supply	—	Provided by interconnected Zone Manager
DHW Pump Relay	—	115 V (ac) 5 A 1/4 hp, pilot duty 240 VA
Primary Pump Relay	—	115 V (ac) 5 A 1/4 hp, pilot duty 240 VA
Mixing P1 Pump Relay	—	115 V (ac) 5 A 1/4 hp, pilot duty 240 VA
Variable Speed Pump	—	115 V (ac) 2.5 A 1/6 HP, fuse T2.5 A 250 V
Combined Load	—	10 A Maximum (for DHW, Primary, Mixing and Variable Speed Pump)
Floating Action Output	—	24 V (ac) 8 VA Maximum
Modulation Output	—	0-10 V Minimum 2500 Ω
Boiler Relay	—	115 V (ac) 5 A 1/4 hp, pilot duty 240 VA
Demands	—	20-260 V (ac) / 0.1 VA @ 24 V
Sensors	—	NTC thermistor, 10 kΩ @ 77°F (25°C ±0.2°C) ß=3892
*Included*	—	Outdoor Sensor 070 and 2 of Universal Sensor 071

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Control

Packaged Weight

Dimensions

Approvals

Ambient Conditions

Power Supply

DHW Pump Relay

Primary Pump Relay

Mixing P1 Pump Relay

Variable Speed Pump

Combined Load

Floating Action Output

Modulation Output

Boiler Relay

Demands

Sensors

Included