Control Network Newsletter

How to Select the Correct Heat Pump Thermostat

Many newer heat pump models feature advanced control logic which shifts operation of the reversing (O/B) valve from the thermostat to the compressor unit.

Heat pump units in this category are incompatible with traditional (O/B) heat pump thermostat models and require standard binary staged heat/cool thermostats similar to those used in conventional staged heating and DX cooling units.

It is important for purchasers to understand the control logic used in their heat pump units before purchasing and installing the controlling thermostat.

The following BASstat thermostats from Contemporary Controls support heat pump units with or without this updated control logic:

• BAST-321HP-B2 (wired) and BW2 (wireless) models: Support heat pump units that specify an O/B (orange/blue) wire terminal on the thermostat interface.
• BAST-221C/CH-B2 (wired) and BW2 (wireless): Support heat pump units that DO NOT specify an O/B (orange/blue) wire terminal on the thermostat interface. 221CH models include a built-in relative humidity (RH) sensor.

NOTE: Be sure to clarify this with the integrator/installer prior to product purchase.

The BAST-221C and BAST-321HP models provide versatile BACnet communication in two options:

• BACnet MS/TP in B2 models have MS/TP baud rates 9.6 kbps – 76.8 kbps (BTL Listed)
• BACnet/IP in BW2 models have 802.11 b/g/n 2.4 GHz Wi-Fi

Both models are BACnet compliant with a B-ASC device profile.

For more information, visit the BASstat Heat Pump Thermostats product page.

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