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Heat Pump Applications
If the support module is being used with a heat pump thermostat
with auxiliary heat, the thermostat can be configured to disable
the use of auxiliary heat during warm weather and to lock out
the compressor when the outdoor temperature is too cold. This
allows for the most efficient use of energy.
At warmer temperatures, a heat pump will operate much more
efficiently than the auxiliary heat. It can save energy to disable
auxiliary heat in some cases, for example, when returning from
a setback on a mild day. The temperature above which auxiliary
heat is disabled is the auxiliary lockout temperature or high
balance point. Refer to the thermostat user manual for a
detailed explanation.
Specifications
Power Supply: 18 to 30 V AC or DC (24 V Nominal)
Maximum Relative Humidity: 90% (non-condensing)
Max. Cable Length Between Module and TSTAT: lOOOft
The maximum cumulative distance between multiple
support modules and the thennostat is 1000 ft.
Max. Cable Length Between Module and Remote
Temperature Sensor: 300ft
T em~rature
Accuracy:
Comfort Range (60°F - 80°F): % 1°F
Control Range (40°F-100°F): %2°F
Operating Range (-40°F - 185°F): % 3°F
Maximum Display Range: -40°F - 18soF
Air-to-air heat pumps become less efficient as the outdoor
temperature drops. The temperature at which it becomes more
efficient to use auxiliary heat instead of the heat pump is the
balance point or low balance point Refer to thermostat user
manual for a more detailed explanation.
Configure the temperature sensor (TIm) that you are using to
sense outdoor temperature to the "Monitor" mode by setting the
dipswitch 3 to the "off' position and the support module address
to number 1. The high and low balance points are set at the
thermostat. Refer to the thermostat Installation Instructions for
more details.
Troubleshooting
Thermostat has no display: Check 24 V AC supply. Check
for incorrect wiring between the thermostat and support module.
Incorrect wiring can damage the thermostat and transformer or
blow a fuse in the equipment. If more than one support module
is used, make sure that each one has a unique address.
Thermostat displays very high temperature: Ensure that
dipswitch 6 is set properly. If dipswitch 6 is set to TIm and a
sensor has not been wired to the TIm terminal, no temperature
(Sensor I or Sensor 2) readings will be displayed. Also, if
dipswitch 6 is set to onboard and a sensor has been wired to the
TIm terminal, incorrect temperature readings will be
displayed. Check wires on remote sensors (flush mount or
outdoor/duct) to ensure that they are not touching. If they are,
separate them.
Thermostat displays very low temperature: Remote sensor
(flush mount or outdoor/duct) is not connected to sensor
properly. Check wiring.
Thermostat doesn't display remote temperature: Make sure
that the support module is set to address 1. Reset support
module after changing any dipswitches by turning off power for
15 seconds.