Friedrich A-SERIES - Manual (Page 13)

13
920-075-08
III. Chassis Operation
9) Remote Thermostat Control
The chassis requires a simple single stage heat-cool wall thermostat.
Each chassis comes with a terminal strip located in the electrical
control box. All internal chassis wiring (low & high voltage) is factory
ready for 230 Volt operation. For 208 Volt operation a single wire
MUST BE CHANGED ON THE TRANS FORM ER. Refer to Figure
7 on page 9.
10) Low Ambient Protection
Each chassis is equipped with Low Ambient Protection in the form of
a suction line thermostat. This thermostat will prevent compressor
operation at low suction line temperatures. Each chassis is also
equipped with a factory in stalled bellows that will drain water from
the base pan to prevent the fan slinger from freezing during winter
weather.
11) Heating Defrost (Heat Pump Models Only)
All Heat Pumps have a passive heating defrost system. Defrost
occurs as needed and automatically switches to electric heat during
defrost. When the outdoor ambient temperature drops below a 45°F
factory setting, the chassis au to mat i cal ly switch es 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°F. The defrost thermostat
may also be used to lock out the compressor in an emergency
heat situation.
12) Fresh Air Door
The Fresh Air Door is an "intake" system. The fresh air door is
opened via a slide on the front of the chassis located just above
the indoor coil. Move the slide left to open and right to close the
fresh air door. The system is capable of up to 60 CFM of fresh air
@ ~.3" H20 internal static pressure.
13) Condensate Disposal System
The internal drain connections are 3/4" FPT fi ttings on the right, left
and outdoor side of the unit. See Figure 10 on page 12. The chassis
is designed with a condensate drain system that has 3 parts. The
three parts work as follows:
Part 1: The system’s fi rst stage increases energy effi ciency
utilizing a factory installed fan that slings the cold
condensate onto the hot outdoor coil.
Part 2: When high outdoor humidity prevents the slinger from
disposing of all the condensate, the excess condensate
overfl ows into the internal drain connection.
Part 3: If Parts 1 & 2 fail for any reason, excess condensate
overfl ows from a spillway directly into the wall plenum
to the outside of the building. IF THIS OCCURS, THIS
IS YOUR WARNING THAT THE CHAS SIS OR DRAIN
NEEDS SERVICING.
Follow all codes when working with the condensate drain
system. A secondary drain pan may be placed beneath the
chassis to prevent condensated spillage due to improper
installation or unit malfunction.
IV. Service & Warranty
14) Servicing / Chassis Quick Changeouts
The chassis is designed for quick disconnect and change out. For
minor electrical service, the control box cover lifts straight up after
the screws & disconnect head are removed. For major electrical,
refrigeration and fan service the chas sis must be removed from
utility closet.
To Remove the Chassis from the Closet:
A Switch the wall ther mo stat off.
B Pull the power disconnect located in the front of the chassis.
C Turn off all power to the unit at the main breaker or
disconnect.
D Disconnect the thermostat wiring.
E Disconnect the electrical connection.
F Disconnect the ductwork.
G Dis con nect the drain connection.
H Slide the chassis out of the wall ple num.
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.
Electrical shock and moving parts hazard can cause injury
or death. Pull out the disconnect head found on the front
of the chassis before servicing.