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© 2011
D 406 - 12/11
Mechanical
A406-1
Applications
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.
Expansion
Tank
Electric
Element
Backup
Freeze
Protection
Device
Electric
Water
Heater
S1
S4
S2
tekmarNet
®
2 Thermostats
P4
P2
Z1
Z2
Z3
Z4
Coaxial
Heat Exchanger
Cold In
Two Stage
Air to Water
Heat Pump
Preheat
Storage Tank
P6
S5
DHW Out
WATER TEMP
T (tank)
BACKUP
AUX (auxiliary)
HP LOOP
INT (intermittent)
HP TYPE
2STG (2-stage)
DHW MODE
5 (DHW preheat)
Application Settings
P2
HP Loop Pump
P4
Tank System Pump
P6
DHW Pump
S1
Outdoor Sensor
S2
HP Return Sensor
S4
Tank Sensor
S5
DHW Sensor
Legend
406
