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Heating/Cooling Chassis
Installation
1. Check the chassis for damage. Spin the fan wheels
manually to confirm free rotation. Check the refrig-
erant tubing to determine that there are no kinks
and that it does not rub against other parts. Report
any shipping damage to the carrier immediately.
2. Check the interior of the installed room cabinet/
wall sleeve. Clean out any dirt or debris that may
have accumulated.
If Replacement chassis is being installed in an
existing RS/MQT cabinet/wall sleeve, the retain-
ing bracket, located in the center top and inside the
cabinet/wall sleeve, must be removed to allow the
chassis to be completely inserted into the cabinet/
wall sleeve. It is held in place with a 1/4" phillips
head screw.
Note: If this PDAE/PDHE chassis is replacing an EA/
MEA chassis that had originally been adapted into an
RS or MQT wall sleeve, you will need Replacement
Gasket Kit #106231301.
3. Slide the chassis into the room cabinet/wall sleeve
until firmly seated against the seal. Push the chas-
sis on the capacitor box cover and/or sheetmetal
flanges. Do not push on the coil surface, control
box cover, or fan scroll.
Note: If Hydronic is the heat source, the Heat Fan
Lock Out sensor must be installed. This control is
found coiled up between the evaporator coil and the
control box.
The factory supplied Heat Fan Lock Out (HFLO)
control is a field mounted aquastat that clips on the
hot water return piping or the steam condensate return
line. After installing the sensor on the return line make
sure the sensor connector is firmly seated on the pins
on the control board. When the unit is in the Heat
Mode, but when hot water or steam is not available,
it prevents the indoor fan from operating. The indoor
fan will only operate in the "Fan Only" and "Cool
Modes".
4. Plug the electrical cord into the receptacle. Excess
cord should be coiled neatly and stored in the con-
ditioner.
5. Replace the front panel as described in the section
"Front Panel Operation and Air Filter Access."
IM 950-1 / Page 12 of 38
CAUTION
Residential and institutional cleaning compounds can
cause permanent damage to the packaged terminal
unit. To avoid damage to unit controls and heat transfer
surfaces, do not spray cleaning compounds onto the
discharge grille, return air opening, or unit controls.
Normal cleaning can be accomplished by wiping the
unit surface with a damp cloth. When using cleaning
compounds on carpets, floors or walls, turn the unit off
to avoid drawing potentially damaging vapors into the
package terminal unit.
Front Panel Operation and Air Filter Access
1. Front Panel - Remove the two sheetmetal screws
adjacent to the release buttons in the top of the
black border, if so equipped.
2. Release the top of the panel from the room cabinet/
wall sleeve by depressing the two vertical but-
tons in the top of the black border, if so equipped,
and/or by removing screws (Figure 13).
Figure 13.
Room cabinet/
wall sleeve
Latching Button
Slot or sheetmetal
screws
Air Filter
Front Panel
Note: Subbase is optional in 208/230V unit, but
required on 265V. Louver frame is optional on all
units.
3. Tilt the panel out from the cabinet and allow the
top to rest against your legs. Both hands are now
free to release the filter on the front side of the coil.
4. To remove the panel, lift it up to disengage the
hinging tabs from the cabinet.
5. To install the front panel, insert the hinging tabs
into the slots in the bottom of cabinet. Push the
top of front panel closed exerting sufficient thumb
pressure on the top of the black border area to al-
low the installation of the sheetmetal screws.
6. Replace the two sheetmetal screws adjacent to the
latching buttons in the front panel (if so equipped)
or replace the two sheetmetal screws in the upper
left and right corners.
Optional
Louver Frame
Subbase
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