Mixing Reset Module - One tN4, Mixing Zoom

Mixing Reset Module - One tN4, Mixing


Brand: Tekmar

421 has been discontinued.
Direct Replacement:
SKU: 422
Brand: Tekmar



Application: Mixing
Type: Reset
Width (Inches): 5-3/8"
Height: 3-5/8"
User Interface: Push Button
Depth (Inches): 9/16"
Ambient Conditions: Indoor Only: 32°-122°F RH equal to or less than 80% to 88F;50% from 104-122F Altitude<2000m
Power Supply: From Interconnected Zone Manager
Relays: 115 V (ac) 5 A-1/4 hp- pilot duty 240 VA
Max Temp (F): 266°F
Temperature Range (F): -76°-266°F
Min Temp (F): -76°F
Output: 24 V (ac) 8 VA Max
Sensors: NTC Thermistor
10 k ohm @ 77°F
Includes: 070 Sensor
(2) 071 Sensors
Weight (lbs): 1.75 lbs

Description for Tekmar 421

Control Description The Mixing Reset Module 421 provides outdoor reset to a hydronic heating system in order to maximize comfort and efficiency. The 421 can operate a single on / off boiler and a single mix water temperature. To operate two mixing devices, a Mixing Expansion Module must be connected to the 421. The 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 1.75 lb. (794 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 122¼F (0 to 50¼C).
RH equal to or less than 80% to 88¼F (31¼C), down to 50% from 104 to 122¼F (40 to 50¼C)
Altitude <2000 m, Installation Category II, Pollution Category 2
Power Supply Provided by interconnected Zone Manager
System 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 7.5 A Maximum (System and Variable Speed Pump)
Floating Action Output 24 V (ac) 8 VA Maximum
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 @ 77¼F (25¼C ¼0.2¼C) +=3892
Included Outdoor Sensor 070 and 2 of Universal Sensor 071

Mixing Reset Module - One tN4, Mixing

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