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Performance Specifications (Cont.)
3.01 CONTROLS
All standard models shall be equipped with electrome-
chanical controls to simplify the serviceability of the unit.
A. Standard Control
The chassis shall have a remote thermostat (RTS)
terminal block and removable plug to enable easy
interface with a modern remote wall thermostat.
B. Emergency Heat
Emergency Heat Switch (Heat Pump models only),
upon failure of the compressor, shall automatically
disable the compressor in heating mode and allow
the use of electric heat during heating cycles.
C. Thermostat
The chassis shall come from the factory ready for
wall thermostat installation.
D. Protection Circuits
Compressor shall have automatic reset, over tem-
perature and over current protection. The fan motor
shall have an inherent, automatic reset over tempera-
ture protection. The electric heater shall have two
over temperature protectors.
4.01 HEAT PUMP OPERATION
Heat pump units shall have the selected room tempera-
ture maintained by cycling either in the heat pump mode
or electric heat. A heat pump unit with electric heat is
switched from the heat pump mode to electric heat when
the unit is on and the outdoor coil temperature reaches
27 °F, or when the outdoor air temperature is 35 °F and
an initial call for heat is triggered. At this time, back-
up electric heat is the only source of heat, and will only
attempt to go back to normal compressor operation after
it has been satisfied.
A temperature-sensing device shall be used to moni-
tor the outdoor coil temperature to limit frost buildup.
Defrosting of the outdoor coil will be activated when
outdoor coil temperature drops below 27 °F or outdoor
air temperature drops to 35 °F or less.
For heat pump operation, a room thermostat with a
B (heating changeover) terminal is required. This will
mean that some “auto changeover” thermostats cannot
be used, as many of them either do not have a B termi-
nal, or energize the B terminal continuously when in the
“auto” position.
Condensation accumulated during reverse cycle heating
will NOT be evaporated against the indoor coil so as to
prevent contamination of the indoor air with pollutants
and odors. Condensation must be disposed of using an
external or internal drain system as shown on plans.
The indoor (EVAP.) fan will stop if the indoor coil tem-
perature falls below 78 °F. It will restart at its set speed
when indoor coil temperature rises back to 80 °F.