Tekmar tekmarNet 2 House Control 406 Installation & Operation Manual page 17

Mechanical
Description: The House Control 406 operates a two stage water source heat pump in heating or cooling mode to supply an
outdoor reset water temperature to 4 on board tank temperature zones. The 406 also operates an on/off boiler to supply an
outdoor reset water temperature to 4 boiler zones connected to the Boil expansion terminals with a Wiring Center 314. The
boiler supplies backup heat to the tank loop using the variable speed pump P1.
To allow the heat pump to operate for some amount of time before the variable speed pump starts adding heat to the tank loop,
use the backup delay setting in the adjust menu. This ensures the heat pump is being used to its full potential before backup is
allowed. A non-condensing boiler may be used since P1 provides boiler return protection, preventing flue gas condensation.
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
P1 Variable Speed Pump
P2 HP Loop Pump
P3 Boiler System Pump
P4 Tank System Pump
P6 DHW Pump
S1 Outdoor Sensor
S2 HP Return Sensor
S3 Boiler Sensor
S4 Tank Sensor
S5 DHW Sensor
tekmarNet ® 2 Thermostats
Backup:
On/Off
P6
Boiler
S3
Geo Field
314
DHW
S5
Z5 Z6 Z7 Z8
Two Stage
Water to Water
Heat Pump
S2 P2
Application Settings
WATER TEMP
ZONES 1-4
BACKUP
BOIL TYPE
HP LOOP
HP TYPE
DHW MODE
406
S1
P3 P1
P4
Expansion
Tank
17 of 48
A406-4
T+B (tank + boiler)
TANK
VAR (variable speed pump)
1STG (1 stage)
INT
2STG
2
tekmarNet ® 2 Thermostats
Z1 Z2 Z3 Z4
S4
© 2011 D 406 - 12/11