Tekmar tekmarNet 2 House Control 406 Installation & Operation Manual page 15

Mechanical
Description: The House Control 406 operates a 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 a modulating condensing boiler to supply an
outdoor reset water temperature to 4 boiler zones connected to the Boil expansion terminals with a Wiring Center 313. The
boiler supplies backup heat to the tank loop using the transfer pump P7.
To allow the heat pump to operate for some amount of time before the transfer pump starts adding heat to the storage tank,
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. Placing the Transfer Pump P7 on the upstream side of the storage tank allows for hot water temperatures from the
boiler loop to be buffered by the storage tank to prevent sending hot water out to the tank temperature zones.
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
P3 Boiler System Pump
P4 Tank System Pump
P6 DHW Pump
P7 Transfer Pump
S1 Outdoor Sensor
S2 HP Return Sensor
S3 Boiler Sensor
S4 Tank Sensor
S5 DHW Sensor
tekmarNet ® 2 Thermostats
Backup:
Mod-Con
Boiler
P6
S3
313
DHW
S5
Z5
Setpoint
P3
Water-to Water
Heat Pump
Geo Field
Application Settings
WATER TEMP
ZONES 1-4
BACKUP
BOIL TYPE
HP LOOP
HP TYPE
DHW MODE
406
S1
Z6 Z7 Z8
P7
S2 P2
Expansion
Tank
15 of 48
A406-3
T+B (tank + boiler)
TANK
XFER (transfer pump)
0-10
INT
1STG
2
®
tekmarNet 2 Thermostats
Z1 Z2 Z3
P4 S4
© 2011 D 406 - 12/11
Z4