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920-075-07(10-03)
III. ChassisOperation
9) Remote Thermostat Control
Thechassisrequiresasimplesinglestageheat-coolwallthermostat.
Each chassis comes with aterminal strip located inthe electrical
control box. All internalchassis wiring (low& highvoltage) isfactory
ready for 230 Volt operation. For 208 Volt operation a singlewire
MUSTBE CHANGED ONTHE TRANSFORMER. Referto Figure
7 on page 9.
10) LowAmbientProtection
Eachchassis isequippedwithLowAmbient Protectionintheform of
a suction linethermostat. This thermostat will prevent compressor
operation at low suction line temperatures. Each chassis isalso
equipped with a factory installed bellows that will drain water from
the base pan to prevent the fan slinger from freezing during winter
weather.
11) HeatingDefrost (Heat PumpModels Only)
All Heat Pumps have a passive heating defrost system. Defrost
occursas needed and automaticallyswitchestoelectricheatduring
defrost.When theoutdoorambienttemperaturedropsbelowa 45°F
factory setting, the chassis automaticallyswitches to electric heat.
As outdoor ambient temperatures rise above 45°F, the chassis
returns to the heat pump mode. The changeover temperature
is user adjustable from approximately 32°F - 55°E The defrost
thermostat may also be used to lock out the compressor in an
emergency heat situation.
12) FreshAir Door
The Fresh Air Door isan "intake" system. The fresh air door is
opened via a slide on the front of the chassis located just above
the indoorcoil. Move the slide left to open and right to close the
fresh air door.The system iscapable of up to 60 CFM of fresh air
@ ~.3" H20 internalstatic pressure.
13) CondensateDisposalSystem
The internaldrain connections are 3/4" FPTfittings on the right,left
and outdoorside oftheunit.See Figure10on page 12.The chassis
is designed with a condensate drain systemthat has 3 parts. The
three parts work asfollows:
Part 1: The system's first stage increasesenergy efficiency
utilizing a factory installed fan that slings the cold
condensate ontothe hotoutdoor coil.
Part2: When high outdoor humidity preventsthe slinger from
disposing ofall the condensate, the excess condensate
overflows into the internaldrain connection.
Part3:
If Parts 1 & 2 failfor any reason, excess condensate
overflows from a spillway directly intothe wall plenum
to the outside ofthe building. IF THIS OCCURS, THIS
ISYOUR WARNING THAT THE CHASSIS OR DRAIN
NEEDS SERVICING.
Followall codes when working with the condensate drain
system. A secondary drain pan may be placed beneath the
chassis to preventcondensated spillage due to improper
installation or unit malfunction.
IV.Service& Warranty
14) Servicing/Chassis QuickChangeouts
The chassis isdesigned for quick disconnect and change out. For
minor electrical service, the control boxcover lifts straight up after
the screws & disconnect headare removed. For major electrical,
refrigeration and fan service the chassis must be removed from
utility closet.
ToRemovethe Chassisfrom the Closet:
A Switch the wail thermostat off.
B Pullthe powerdisconnect located inthe front of the chassis.
C Turnoff all powerto the unit at the main breaker or
disconnect.
D Disconnectthe thermostat wiring.
E Disconnectthe electrical connection.
F Disconnectthe ductwork.
G Disconnectthe drain connection.
H Slide the chassis out of thewall plenum.
I Lift the chassis out of the utility closet.
15) Warranty
All service work must be done by a qualified servicer. See
Warranty on the next page, and consult your dealer or contractor
for details.
Electricalshock and moving parts hazardcan cause injury
or death. Pull out the disconnect head found on thefront
ofthe chassis before servicing.
13
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