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Mode Switch
Mode A – Non-standby mode. The entire heating and chilled water load will be serviced by the
heat pump only.
Mode B – Fossil fuel furnace standby mode. Use mode B when a standby (backup) fossil fuel
forced air heat source is present. This is the proper mode if your system will be using a forced air
furnace as a backup to take advantage of utility interrupt (off-peak) programs. When the system is
in "standby" condition (which can happen because of utility company interrupt or if the outdoor
temperature falls below the SW OVER setting), all hydronic zones are non-functional.
Mode C – Auxiliary boiler standby mode. Use mode C when a gas or electric boiler is present as a
standby heat source. The boiler will utilize the buffer tank target temperature. This setting may be
used with utility interrupt (off-peak) programs.
Mode D – Dedicated to Electro Industries' NorAire
Switchover Temperature (SW OVER)
This switch is shipped from the factory with a square "GAS" label. This label should be removed ONLY if a
secondary furnace or boiler is present and active in the system and the Mode Switch is set to "B" or "C". The
installer should remove the label and adjust this switch only after reading this manual and understanding the
operation of the switch. Select the desired OT (Outdoor Temperature) where the heat pump is to be shut down
and the backup furnace is to be utilized. Even though this dial is only utilized when a gas furnace / boiler is in
the system, we recommend setting this dial to "0" position (disable) in modes 1 and 4. From the factory, this
switch is set to 0 (disable).
0 = Disable
1 = -15° F
2 = -10° F
3 = 0° F
Stat Override Timer (SOT)
The intent of the SOT Dial is to take care of very unusual heat/cool conditions or building matching situations,
the general sequence relating to OT temperature should take care of proper thermostat cycling without ever
reaching SOT timeout (end). Thus, it is recommended the SOT be a high number. The SOT is a "per call"
timer, and is reset as soon as the heat or cool call is satisfied.
0 = 30 minutes
1 = 90 minutes (default)
Buffer Tank Controller Dial Configurations
Below is a list of different configurations the Buffer Tank Controller system can be adapted to and the matching
appropriate Buffer Tank Controller settings. This section is in regards to possible heating source configuration,
interfacing and dial selection
Heat pump only
• Mode Dial: A
• SW Over Dial: 0
• SOT Dial: 0=30min 1=90min 2=180min 3=270min
Heat pump with fossil fuel furnace
• Mode Dial: B
• SW Over Dial: 0
• AUX EL: 0
• SOT Dial: 0=30min 1=90min 2=180min 3=270min
• Thermostat type: Conventional 1H/2C
02/22/2012
4 = 5° F
5 = 10° F
6 = 20° F
7 = 30° F
2 = 180 minutes
3 = 270 minutes
10
®
air source heat pump boiler system.
HI114
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