TEKMAR 402 - Control Description The House Control 402 is designed to operate as part of a complete hydronic heating system with tekmarNet®2 (tN2) thermostats. It can provide operation of two outdoor reset water temperatures in addition to Domestic Hot Water and Setpoint capabilities. It is easy to add more zones, add schedules or other convenient accessories through the use of the tekmarNet®4 (tN4) Expansion terminals.
Literature — D402, Q402, SB057
Packaged Weight — 1.37 lbs (0.62 kgs)
Enclosure — NEMA 1 rated, blue PC+ABS plastic
Dimensions — 5.5” H x 5.5” W x 2.25” D (140 x 140 x 57 mm)
Approvals — CSA C US, meets ICES & FCC regulations for EMI / RFI
Ambient Conditions — Indoor use only, 32 to 104°F (0 to 40°C).
— RH equal to or less than 90% Non-condensing
Power Supply — 24 V (ac) +/- 10% 60 Hz, 100 VA max, Class 2
Control Load — 2 VA
Zone Valve/Floating Action Load — 24 V (ac) 2 A, maximum combined current (zones 1 to 4): 89 VA (3.7 A)
Boiler Relay — 24 V (ac) 5 A
Boiler System Pump Relay — 115 V (ac) 5 A, 1/6 HP
Mix System Pump Relay — 115 V (ac) 5 A, 1/6 HP
DHW Pump Relay — 115 V (ac) 5 A, 1/6 HP
Variable Speed Pump Relay — 115 V (ac) 5 A, 2.0 A
Pump Power — 115 V (ac) 12 A max
Setpoint and DHW Calls — Short, 0 - 32 V (ac)
Boil/Mix Modulating Output — 0 - 10 V (dc), 3 kΩ minimum load impedance
Sensors — NTC thermistor, 10kΩ @ 77°F (25°C +/- 0.2°C) ß=3892
Included — Outdoor Sensor 070 and 2 of Universal Sensors 082
Warranty — Limited 3 Year