TEKMAR 400 - Control Description The House Control 400 is designed to operate as part of a complete hydronic heating system with tekmarNet®2 (tN2) Thermostats. It can provide operation of one outdoor reset water temperature in addition to Domestic Hot Water and Setpoint capabilities. It has four built in zones that can operate up to four zone valves. It is easy to add more zones, add schedules or other convenient accessories through the use of the tekmarNet®4 (tN4) expansion terminals.
Literature — D400, Q400
Packaged Weight — 1.37 lbs (0.62 kgs)
Enclosure — O-Enclosure, blue PC+ABS UL94-5VA 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 90% Non-condensing.
Power Supply — 24 V (ac) +/- 10% 60 Hz, 100 VA max, Class 2
Control Load — 2 VA
Zone Valve 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
DHW Pump Relay — 115 V (ac) 5 A, 1/6 HP
Pump Power — 115 V (ac) 12 A max
Setpoint and DHW Calls — Short, 0 - 32 V (ac)
Boiler Modulating Output — 0 - 10 V (dc), 3 kΩ minimum load impedance
