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Heat Pump Operation ― Zoneline 3800
The Zoneline heat pumps are designed to help
insure a comfortable room. When HEAT is selected,
the unit will determine if the room air is warm
enough to satisfy the thermostat setting. If the
temperature at the unit sensor is below the desired
temperature, the electric resistance heater will be
utilized to warm the room to the point where the
thermostat is satisfi ed. This feature is designed to
allow the temperature of an unoccupied room to
be maintained at an energy-saving level without
inconveniencing the room occupant. Once the
thermostat has been satisfi ed, the resistance
heater will turn off and the heat pump will operate
as shown in the Heat Source Logic chart until the
thermostat calls for heat again. The unit will operate
in this manner if connected to a Central Desk
Control which is enabled (CDC switch open).
Heat Source Logic Chart
*If the temperature boost switch (dip switch #8) is in the “ON” position
the supplemental heater will be used with heat pump operation.
Supplemental heater: 1.0 KW @ 230 V; 0.8 KW @ 208V; 1.0 KW @ 265V.
The “Temperature Boost” option utilizes the
supplemental heater simultaneously with heat
pump operation when the outdoor temperature is
below 46°F regardless of the indoor air temperature.
The chart above indicates the heat source of the
heat pump under various indoor and outdoor
conditions. The unit is designed to provide heat
pump savings without sacrifi cing room comfort.
The quick heat recovery feature is not affected by
the heat source logic shown in the chart above.
The full heat output of the resistance heater is
dependent upon circuit amperage and the power
connection kit used.
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Heat Pump Defrost
Note:
Zoneline heat pumps utilize a reverse-cycle
demand defrost system to extend heat pump
operation and increase savings from extended
operation.
The microprocessor determines the need for
defrosting based on continuous compressor
running time, outdoor air temperature, outdoor
coil temperature and the rate of temperature
change of the outdoor coil. When defrosting is
required, the unit de-energises the reversing valve
coil, directing the hot gas into the outdoor coil
to melt the frost build-up. Before and after the
reverse-cycle defrosting, the unit shuts off the
compressor to allow the refrigerant pressures to
equalize throughout the system. This eliminates the
possibility of a loud reversing noise. During these
periods of pressure equalization, the full resistance
heat capacity of the unit is activated to help insure
room comfort conditions during the defrost cycle.
The unit remains in the defrost cycle for a minimum
of two minutes up to a maximum of nine minutes.
The defrost cycle terminates when the outdoor coil
reaches a temperature of 68°F or the maximum
time has been reached.
Heat Pump Condensate
Note:
Units with ICR may not be installed in
seacoast or corrosive environment applications.
The Zoneline 3800 Series heat pumps may be
ordered with a factory installed Internal Condensate
Removal (ICR) system to minimize the amount of
condensate water draining from the unit during
heat pump operation. The ICR system has proven
to be an effective means of minimizing the amount
of heat pump condensate dripping from the
unit. However, if the requirements of a particular
installation will allow no dripping of condensate
water from the wall case, the installation of an
internal or external drain system is recommended.
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