© 2011
D 406 - 12/11
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XFER (Transfer Pump)
A boiler is the backup heat source. Backup heat is transferred
from the boiler loop to the heat pump loop with the Transfer
pump. This is only selectable if a boiler water temperature has
been configured. Once enabled, the Transfer pump and Boiler
pump will operate with a 10°F (5.5°C) differential around the
tank target temperature while applying a 30 second minimum
on and off time. The boiler will cycle to maintain its target.
It is useful to pipe the boiler on the upstream side of the storage
tank to buffer any high water temperatures coming from the
boiler loop from going directly into the tank zones.
Note:
Boiler return protection is not available when selecting
this type of backup.
Expansion
Tank
Mod/Con
Boiler
Transfer
Pump
Water/Water
Heat Pump
To
System
Storage
Tank
Boiler
Sensor
HP Return
Sensor
Tank
Sensor
For Transfer Pump backup, see A406-2, A406-3 and A406-5.
AUX (Auxiliary)
An electric resistance element in the storage tank, or some
other auxiliary heat source is the backup. Once enabled,
the Backup relay will operate with a 10°F (5.5°C) differential
around the tank target temperature while applying a 30 second
minimum on and off time.
Expansion
Tank
To
System
Electric
Element
Backup
Tank
Sensor
HP Return
Sensor
For an electric water heater as backup, see A406-1.
Selecting Water Temperatures (Bus)
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There are three possible water temperatures that the House
Control 406 can operate and they are called:
Tank (T)
Mix (M)
Boil (B)
The Tank water temperature must always be used and is common
to all applications. The Mix and/or Boil water temperatures
can be added according to the system requirements. Use
the WATERTEMP setting in the Adjust Menu to configure the
proper water temperatures for the application. The following
table references application drawings with different water
temperatures selected.
•
•
•
Application
Water Temperatures
A406-1
Tank
A406-2
Tank & Mix & Boil
A406-3
A406-4
Tank & Boil
A406-5
Tank & Mix & Boil
Assign Zones 1-4
--------------------------------
--------------------------------
There are four tN2 zones on the House Control 406 that have a
24 V (ac) output to operate a zone valve. These zones are not
fixed to any water temperature, rather they can be assigned
to any one of the available water temperatures:
Use the ZONE 1-4 setting in the Adjust Menu to assign the on-board
tN2 zones to the TANK, MIX or BOIL water temperature.
NOTE:
TANK is not available if both mixing and boiler tem-
peratures have been configured.
Sequence of Operation
tekmarNet
®
System
Section A
tekmarNet
®
is a family of products that use communication to
operate the HVAC system in a comfortable and efficient manner.
The House Control is the central component in a tekmarNet
®
system and requires tekmarNet
®
2 (tN2) Thermostats to be
directly connected to the control.
The tekmarNet
®
4 (tN4) Expansion terminals can link the House
Control with other tekmarNet
®
components:
Wiring Centers 313, 314, 315, 316 - Add additional zones
tN2 and tN4 Thermostats - Add thermostats
tN4 Timer 033 - Adds 4 programmable schedules
tN4 User Switch 479 - Provides a system override for vaca-
tions and holidays
tN4 Setpoint Control 161 - Control hot tubs, pools and more
•
•
•
•
•
System Setup
Section B
Selecting a Backup
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-------------------------------
A backup heat source is required to satisfy the heating load
if the heat pump cannot maintain the tank target. If the heat
pump can no longer operate in heating mode or if it has run at
full output for the BKUP DLY time, the backup is called upon
for heating. The BACKUP setting in the Adjust Menu can be
configured in the following ways:
NONE
No backup heat source is available.
