Applications - Tekmar tekmarNet 2 House Control 406 Installation & Operation Manual

Applications

Mechanical
Description: The House Control 406 operates a two stage air source heat pump in heating or cooling mode to supply an
outdoor reset water temperature to 4 on board tank temperature zones. Additional zones can be added using the Tank tN4 and
C Expansion terminals. Domestic Hot Water pre-heat is achieved by maintaining the DHW sensor S5 in the preheat storage
tank at an adjustable temperature, 90°F (32°C) default, using the DHW pump P6. The heat pump will target a water temperature
20°F (11°C) higher than the preheat tank target at the return sensor S2, and is limited by the HP RETURN MAX setting in the
Adjust Menu. An electric element in the system storage tank is switched on through an isolation relay with the backup relay on
the 406 to provide backup heat to maintain the Tank Sensor S4 at its target temperature.
Tank zones can have fan-coils, air handling units, chilled beams, or chilled panels as their terminal units depending on the type
of tekmarNet ® thermostat selected.
Legend
P2 HP Loop Pump
P4 Tank System Pump
P6 DHW Pump
S1 Outdoor Sensor
S2 HP Return Sensor
S4 Tank Sensor
S5 DHW Sensor
Two Stage
Air to Water
Heat Pump
S1
Preheat
Storage Tank
Cold In
Coaxial
Heat Exchanger
P6
S2
Freeze
Protection
Device
Application Settings
WATER TEMP
BACKUP
HP LOOP
HP TYPE
DHW MODE
406
S5
P2
Expansion
11 of 48
T (tank)
AUX (auxiliary)
INT (intermittent)
2STG (2-stage)
5 (DHW preheat)
tekmarNet ® 2 Thermostats
DHW Out
Z1 Z2
P4 S4
Tank
© 2011
A406-1
Z3 Z4
D 406 - 12/11