McQuay PDAE, PDHE Maintenance Manual
®
Installation & Maintenance Data IM 950-1
PDAE/PDHE 16" x 44" Replacement Unit
Comfort Conditioner
Group: PTAC
Part Number: 669548801
Date: February 2009
Note: Installation and maintenance are to be performed only by qualied personnel who are familiar with local codes and regula-
tions and are experienced with this type of equipment. Caution: Sharp edges and coil surfaces are potential injury hazards.
©2009 McQuay International
Table of Contents
Safety Information .......................................................3
Inspection .....................................................................3
Nomenclature ...............................................................4
Dimensional Data .......................................................5
all Opening Requirements ..................................6
W
Installation Considerations ....................................7
Preparing the Unit for Installation ...........................8
Installation of: ...........................................................8
Louver Frame ........................................................8
Cabinet/W
Optional Condensate Drain Kit .............................9
Room Cabinet/Wall Sleeve .............................10-11
Heating/Cooling Chassis .....................................12
Heat Fan Lock Out Control .................................12
Equipment Start-up ..............................................13
Start-up Report–Audit .........................................14
ols ..............................................................15-26
Contr
Standard Digital
Modes of Operation ........................................17-21
Premium (Programmable) Digital
ouchpad Control Operating Instructions ......22-24
T
Remote
all Sleeve Extension .............................8
Touchpad Control ................15-17
Wall Mounted Thermostats ...............25-27
Wiring Diagrams .................................................27-31
Remote
Premium (Programmable)
Digital Control Board ..........................................
Standard (Non-programmable)
Digital Control Board ..........................................
Digital Control Board
Digital Control Board
Scheduled Maintenance ........................................32-33
Faults and Protection Codes for
PTAC/PTHP Control Board .......................................34
Solid State Digital Controls-LUI Interface
Display Codes ............................................................34
Troubleshooting Chart ..........................................35-36
Approximate Shipping Weights .................................37
Thermostat With Secondary Units .........27
28
29
With Standby Power ........30
Without Standby Power ...31
Now that you have made an investment in modern, efcient McQuay® equipment, its care and operation should
be a high priority. For training information on all McQuay HVAC products, please visit us at www.mcquay.com and
click on Training or phone 540-248-0711 and ask for the Training Department.
IM 950-1 / Page 2 of 38
Safety Information
Follow all safety codes. Wear safety glasses and
work gloves. Use a quenching cloth for brazing
operations. Have a re extinguisher available. Follow
all warnings and cautions in these instructions and
attached to the unit. Consult applicable local building
codes and National Electrical Codes (NEC) for special
requirements.
Recognize safety information. When you see a
safety symbol on the unit or in these instructions, be
alert to the potential for personal injury. Understand
the meanings of the words DANGER, WARNING,
and CAUTION. DANGER identies the most serious
hazards that will result in death or severe personal
injury; WARNING means the hazards can result in
death or severe personal injury; CAUTION identies
unsafe practices that can result in personal injury or
product and property damage.
Improper installation, adjustment, service,
maintenance, or use can cause explosion, re,
electrical shock, or other conditions which may result
in personal injury or property damage. This product
must be installed only by personnel with the training,
experience, skills, and applicable licensing that makes
him/her “a qualied professional HVACR installer.”
WARNING
The installer must determine and follow all applicable
codes and regulations. This equipment presents hazards
of electricity, rotating parts, sharp edges, heat and weight.
Failure to read and follow these instructions can result in
property damage, severe personal injury or death. This
equipment must be installed by experienced, trained
personnel only.
DANGER
Hazardous Voltage!
Disconnect all electric power including remote
disconnects before servicing. Failure to
disconnect power before servicing can cause
severe personal injury or death.
CAUTION
Use copper conductors only. Unit terminals are not
designed to accept other types of conductors.
Failure to do so can damage equipment.
Inspection
When the equipment is received all items should
be carefully checked against the bill of lading to be
sure all crates and cartons have been received. All
units should be carefully inspected for damage when
received. If any damage is noticed, the carrier should
make the proper notation on the delivery receipt
acknowledging the damage. The carrier should also
ll out a carrier Inspection Report. The McQuay Inc.
Trafc Department should then be contacted. The unit
nameplate should be checked to make sure the voltage
agrees with the power supply available.
A complete unit consists of the following
components, ordered and shipped separately.
Heating/Cooling Chassis
1.
2. Front Panel.
2. Room Cabinet/Wall Sleeve.
3. Outdoor Louver.
4. Subbase – Optional for 208V and 230V units but
mandatory for all 265V.
5. Fixed heater with factory installed power cord.
6. Electrical receptacle – Required for 208V and
230V units but mandatory for all 265V and
Hydronic units.
7. Plug cord cover – Optional for 208V and 230V
units but mandatory for all 265V.
IMPORTANT
This product was carefully packed and thoroughly
inspected before leaving the factory. Responsibility
for its safe delivery was assumed by the carrier upon
acceptance of the shipment. Claims for loss or damage
sustained in transit must therefore be made upon the
carrier, as follows:
VISIBLE
Any external evidence of loss or damage must be noted
on the freight bill or carrier’s receipt, and signed by the
carrier’s agent. Failure to adequately describe such
external evidence of loss or damage may result in the
carrier’s refusal to honor a damage claim. The form
required to le such a claim will be supplied by the carrier.
CONCEALED
Concealed loss or damage means loss or damage which
does not become apparent until the product has been
unpacked. The contents may be damaged in transit due
to rough handling even though the carton may not show
external damages. When the damage is discovered upon
unpacking, make a written request for inspection by the
carrier’s agent within fteen (15) days of the delivery
date. File a claim with the carrier since such damage is
the carrier’s responsibility.
LOSS OR DAMAGE
LOSS OR DAMAGE
IM 950-1 / Page 3 of 38
McQuay Model PDAE/PDHE Product Nomenclature
Note: For Illustration purposes only. Not all options available with all models.
Please consult a McQuay Sales Representative for specic availability.
P DAE 1 009 E M R H A B D M A A E
Unit Type
P = PTAC
Product Identier
PDAE = A/C PMES/EA Replacement
PDHE = H/P PMRS/RS Replacement
Design Series
1 = A Design 1
2 = B Design 2
3 = C Design 3
4 = D Design 4
5 = E Design 5
Unit Size
007 = 7,000
009 = 9,000
012 = 12,000
015 = 15,000
017 = 17,000 (Cooling Only)
Voltage
A = 115-60-1
E = 208/230-60-1
J = 265/277-60-1
P = 208/230-60-1 w/stndy 115-60-1
Warranty
A = Standard
E = Extended
X =Special
SKU
A = Stock
B = Build to Order
Upgrade Packages
S = Seacoast
Y = None
Power Connection
L = Long Cord – 72" (Standard)
S - Short Cord – 18" (Optional)
18" Cord, Standard w/Hydronic
Subbase
Y = None
Brand Name
M = McQuay
Refrigerant
R = R22
Heating Type
E = Electric Heat
H = Hydronic (PDAE only)
Y = None (PDHP only)
Electric Heat
A = 2.5 Kw
B = 3.5 Kw
C = 5.0 Kw
Y = None
Hydronic Heat Type
S = Steam Top Mount (Normally Closed)
H = Hot Water Top Mount (Normally Open)
Y = None
Room Interface
Cabinet Type
D = 16" x 44" Replacement
Controls
Control Board Type
B = Basic Control
P = Premium Controls
(Req'd for Hydronic Heat)
User Interface Type
P = Programmable (Unit Mtd. Touchpad)
N = Non-Programmable
(Unit Mtd. Touchpad)
Y = None (Wall Stat with Blank-off Plate)
Damper Type
Damper Control
A = Automatic (Required for Hydronic Heat)
M = Manual
Y = None
IM 950-1 / Page 4 of 38
Dimensional Data
PDAE – Air Conditioner with Electric Heat / PTHE – Heat Pump with Electric Heat
Finished
Wall Line
1
10
/2" (267mm)
Minimum
Top View
7
44
/8" (1140mm)
1/2" (13mm)
163/8"
(416mm)
Louver thickness: 3/8" (10mm) stamped,
A =
1
1
/8" (29mm) extruded architectural
20" (508mm)
A
111/16"
(43mm)
1
/2" (1054mm)
41
Front View
3" (76mm)
or 4" (102mm)
1
6
/4"
(159mm)
Side View
1
/4" (108mm)
4
to 133/4" (349mm)
IM 950-1 / Page 5 of 38
Wall Opening Requirements
The rough opening should measure 165/8" high x
1
/8" wide. When using a louver frame, the opening
45
must measure 16
used for panel wall and thin wall applications to assure
positive anchoring to the wall (Figure 13). When a
elecrical subbase is used, the opening must start 3"
to 4" above the nished oor (including carpeting) to
match the height of the subbase selected. The subbase
is available in 3" or 4" heights and has adjustable
leveling legs that provide up to an additional 1" height.
A 3" or 4" subbase is required for 265V models and
is optional for 208/230V models.
7
/8" x 453/8". Louver frames should be
Figure 3. Frame and Brick Construction
3
16
/8" x 447/8"
Cabinet/Wall Sleeve
5
16
/8" High
1
4
5
/8" Wide
Cabinet/Wall Sleeve
Rough Opening
Lintel
(by others)
Wall Construction Types
Figure 1. Panel Wall (Thin) Construction
Steel Studs
Concrete
Pillars
165/8" x 451/8"
Cabinet/Wall Sleeve
Rough Opening or
167/8" x 453/8" When using a
Louver Frame
(See page 9 for Installation)
Figure 2. Masonry Wall (Thick) Construction
Room Side
Floor
Lintels (by others)
Installation – Considerations
The PDAE/PDHE 16" x 44" Replacement Unit is
designed and built for through-the-wall installation
in either existing or new buildings. Each conditioner
consists of the following components identied in their
typical installation sequence:
Subbase – Optional on 208/230V, standard on 265V,
1.
shipped in its own carton.
. Louver Frame – Optional, shipped ve (5) per
2
carton.
Room Cabinet/Wall Sleeve with Front Panel and
3.
Filter – Shipped in palletized carton.
4. Outdoor Louver – Shipped in its own carton.
IMPORTANT
Air ow required for PTAC units must not be restricted
by exterior plants or walls. Plants or shrubs must not
be planted in close proximity to the outside grille of the
PTAC unit. Vegetation planted too close to grilles will
cause discharge air to be recirculated, thereby increasing
electrical consumption. Warranty will be voided if it is
determined that the compressor life is shortened from
overheating due to close proximity of outside obstructions.
Wall Sleeve Extension
(See page 9 for
Installation)
IM 950-1 / Page 6 of 38
Splitters
3
/8" x 447/8"
16
Cabinet/Wall Sleeve
Note: Discharge air restrictions include, but are not
limited to:
• Vegetation
• Concrete walls or barriers
• Overhangs that do not allow discharge air to rise
• Installation of bug screen of any kind
Heating/Cooling Chassis – Shipped in palletized
5.
carton.
General Information
Electric Service – All wiring should be done in accor-
dance with local and national electrical codes. Electric
service for the replacement unit is via a receptacle type
outlet furnished with 265V units. 208/230V units are
equipped with a plug and cord set to plug into a receptacle which is supplied by others and eld installed.
The use of an extension cord to increase the length
of the plug/cord set furnished as a part of the unit is not
recommended.
3. Conditioner with Subbase – Required with 265V
units, optional with 208/230V units. The subbase
includes an electrical compartment in the right front
corner providing brackets for mounting a receptacle
directly beneath the base pan knockout. There is no
need for a junction box when this method is used
(see Figure 6). Since 265V units require a subbase,
the electrical cord is only long enough to reach a
receptacle in the subbase.
In all cases, excess cord should be rolled up an stored
in the conditioner.
Suggested Outlet Locations
1. Floor Mounted Conditioners – 208/230V units
only. Mount an outlet in the wall to the right or left
of the conditioner (see Figure 4). The chassis’ cord
has a 72 inch usable length from where it exits from
the lower right of the front panel.
Fig. 4. Floor-mounted Conditioner
Wall Mounted Conditioner – 208/230V units
2.
only. A receptacle is generally mounted beneath
the conditioner on, or recessed in, the wall so it is
concealed by the conditioner overhang (see Figure
5). The chassis’ cord has a 18 inch usable length
from where it exits from the lower right of the front
panel.
Fig. 6. Conditioner with Subbase
Figure 7. Cabinet/Sleeve Base Pan - Top View
447⁄8"
(1140mm)
Knockout
20"
(508mm)
81⁄4"
(210mm)
2
(70mm)
1
4
⁄8" (105mm)
11⁄2"
(38mm)
3
⁄4"
Fig. 5. Wall-mounted Conditioner
Note: Remove knockout from base pan if subbase is
used.
IM 950-1 / Page 7 of 38
Preparing Unit for Installation
Note: rst install the louver frame following steps 1
and 2 as described in "Louver Frame Installation."
Remove the outer carton and inspect the conditioner
for damage. Report any damage found to the carrier.
Note: Save the outer carton for reuse to cover the
installed conditioner until ready for use.
Louver Frame Installation
When a louver frame is used, it must be installed
prior to, or at the same time, as the room cabinet/wall
sleeve, and it must be level and square (see Figure 8).
Cabinet/Wall Sleeve Extension for Thick Wall
Construction Types
The standard wall sleeve will accommodate a
maximum wall thickness of 10.25." For thicker walls,
wall sleeve extensions are required and are available
from your local representative. When it is supplied by
the representative, it is treated for maximum corrosion
resistance and matched to exact size of the standard
wall/sleeve. Be sure to provide air splitters to prevent
recirculation of condenser air. Air splitters should be
placed in the wall sleeve as shown in gure 9. It is
important that spacing of the air splitters match exactly
those dimensions shown in gure 9.
Figure 9. Wall Sleeve Extension
Apply caulking compound on the surfaces of the
1.
louver frame’s four anges which will come in
contact with the wall. Add caulking as required for
weather tight seal.
2.
Insert the sleeve of the louver frame into the wall
opening from the exterior of the building and apply
rm pressure so that the caulked frame anges are
snug against the exterior of the building. Secure
the louver frame to the wall if desired.
Secure the louver frame to the wall through the
3.
sides and top. Never secure the frame through the
bottom as it may cause leaks.
If the louver frame is to be installed in a panel wall,
it should be installed at the same time as the room cabinet/wall sleeve.
Figure 8.
Nut &
washer
5 places
Cabinet
Sleeve
Caulk
sides
Subbase
Louver
Frame
Louver
Drill holes &
secure top
& sides
Leveling
bolt
Secure to
Subbase
Receptacle
1
⁄16"
1
Flange
4
Note: Subbase is optional on 208/230V units, but
required on 265V.
Louver frame is optional on all units.
IM 950-1 / Page 8 of 38
24"
as required
16"
117/8"
44.50"
Air Splitters
24"
5
/8"
7
Wall Sleeve Extension
Room Side
Cabinet/Wall Sleeve Extension Installation
Wall sleeve extensions are shipped in a separate
carton and tagged to match the proper unit. Be sure to
check tagging of the extension against that of the unit.
Install the wall sleeve extension as follows:
Position the extension with standard wall
1.
sleeve so proper alignment with drain and
mounting holes is achieved.
2. Place a bead of caulk around the perimeter of the
wall sleeve and another bead around the mating
side of the wall sleeve extension so that the joint
is watertight. Do not permit caulking to block the
weep holes. Be sure to use a resilient caulking
such as silicone.
3. Assemble the wall sleeve extension to the wall
sleeve. Clean out weep holes to assure proper
drainage.
4. Attach indoor drain kit (if used) according to the
instructions on page 9. Outdoor drain kits must
be installed to the wall sleeve extension.
5. Continue wall sleeve installation according to
instructions on page 10-11.
Condensate Drain Kit Installation
External Drain Kit
Indoor Drain Kit
3. Drill two (2) 5/32" pilot holes for the mounting
screws. These holes can be located using the drain
kit as a pattern.
4. Assemble the drain kit as shown in Figure 10 and
securely fasten it to the wall sleeve with the
o
screws provided. Use either the 90
elbow or 6"
straight tting as required.
5. Install the cabinet/wall sleeve as described on
pages 10-11.
Alternate 6" Long, 1/2" O.D.
Straight Copper Tube
Figure 10 illustrates the installation of the indoor
drain kit. The indoor drain kit must be installed before
placing the cabinet/wall sleeve into the opening.
Assembly of the external drain kit should be completed
after the cabinet/wall sleeve has been installed.
Indoor Drain Kit Installation
1. Locate the drain so that it will be on the room side
of the wall when the wall sleeve is installed.
2. Drill a 1/2" diameter hole in the base of the wall
sleeve for the drain.
Figure 10. Indoor Drain Kit
Room Side
Note: When using the external drain kit, the sleeve
must be ush or beyond the outside nished wall (do
not recess).
External Drain Kit Installation
1. Assemble the drain kit as shown in Figure 11.
2. Choose the side of the cabinet/wall sleeve to which
the drain kit is to be installed.
3. There are drain holes and pilot holes provided in
the wall sleeve from factory. Place the drain kit
against the chosen drain hole and fasten securely
with screws provided. Use either the 90
6" straight tting as required.
4. Cover the unused drain hole with the block off
plate and gasket supplied with the drain kit.
Indoor Drain Detail
Contractor To Drill Three (3) Holes To Accept
Drain Kit
Gasket
o
elbow or
Neoprene Sponge Gasket
Steel Mounting Plate
Cover
Plate
Neoprene
Sponge
Gasket
Screws
Cabinet Bottom
Tube
1/2"
(13mm) O.D.
IM 950-1 / Page 9 of 38
Figure 11. External Drain Kit - installed after the cabinet/wall sleeve has been installed.
Neoprene Sponge Gasket
Block off plate and gasket
Alternate 6" Long,
1/2" O.D. Straight Copper Tube
Steel Mounting Plate
Room Cabinet/Wall Sleeve
Room Side
Note: Use of 6" straight drain
tube will require modication of
architectural louver.
1/2" (13mm) O.D. Drain Tube
Neoprene Sponge Gasket
Installation
Considerations
The cabinet/wall sleeve is a standard size 163/8"
7
high, 44
are factory welded into the sleeve to facilitate easy
installation and removal of the chassis.
chassis and the louver to the wall sleeve.
Panel and Thin Wall Applications
The PDAE/PDHE conditioner can be successfully
installed in various ways. However, this instruction is
based on the use of both a subbase and a louver frame.
Install the subbase as described in the section "In-
1.
Install the louver frame as described in the section
2.
Position the room cabinet/wall sleeve in the louver
3.
Level the subbase with leveling bolts provided.
4.
IM 950-1 / Page 10 of 38
/8" wide and 203/4" deep. Slide channels
All necessary fasteners are supplied to assemble the
stallation of Subbase. Also refer to IM 937 shipped
with the subbase.
“Louver Frame Installation.”
frame opening and on the subbase. The rear face
of the cabinet should be recessed from the outside
edge of the louver frame by the depth of the louver
to be installed (see Figure 12).
Attach the subbase to the room cabinet/wall sleeve
per instructions provided with the subbase.
After the room cabinet/wall sleeve is leveled side
5.
to side and pitched 1/4 bubble to the outside,
secure the louver frame to the wall with screws
driven through the sides and top of the room cabinet/wall sleeve outward through the louver frame.
Never secure the frame through the bottom as it
may cause leaks.
Caulk the outdoor joint between the room cabi-
6.
net/wall sleeve and the louver frame: top, bottom,
and both sides. Do not permit caulking to block the
weep holes.
Install the outdoor louver. Holding the louver with
7.
a wire loop or other similar means, push the louver
out through the rear opening in the room cabinet/
wall sleeve and pull the louver back to the rear
face so that the louver studs pass through the holes
in the room cabinet/wall sleeve ange. Attach the
louver with the washers and nuts provided, and
securely tighten the louver in place.
Cut the shipping carton as necessary to cover the
8.
installed room cabinet/wall sleeve until ready to
use.
Masonry and Thick Wall Applications
1. Preparation of the wall opening — In new construction, the room cabinet/wall sleeve can be built into
the building wall as it progresses, or openings can
be left for later installation.
lintel by others must be used to support any brick
A
or masonry work above the conditioner.
Set the room cabinet/wall sleeve in soft mortar and
2.
position it in the wall opening. The rear face of the
conditioner should be recessed from the outside
edge of the wall opening by the depth of the louver
to be installed. When using the anged stamped
louver, the rear ange of the room cabinet/wall
sleeve will be ush with outside edge of the wall
opening. The center of gravity of the conditioner is
1
⁄2" from the rear face. For wall-mounted condi-
9
tioners, the center of gravity must be within the
load bearing portion of the wall; otherwise, sup-
port is required.
Level the room cabinet/wall sleeve side to side and
3.
pitch down 1/4 bubble to outside. Securely fasten the room cabinet/wall sleeve in the wall from
inside the cabinet through the sides and/or top on
the outdoor side of the weather seal. Make sure
the cabinet is not distorted. Never secure through
the bottom of the cabinet. For installations using
a subbase, level the room cabinet/wall sleeve with
leveling bolts provided with the subbase. Attach
the subbase to the room cabinet/wall sleeve per
instructions provided with the subbase.
After the room cabinet/wall sleeve is installed and
4.
leveled side to side and pitched down 1/4 bubble
to the outside, secure it and the louver frame to the
wall with screws driven through the sides and top
of the room cabinet/wall sleeve outward through
the louver frame. Never secure the frame through
the bottom, as it may cause leaks. A
hole has been added to each side of the wall sleeve
as a provision for securing the sleeve in the wall
opening. Each hole is located 2" down from the
top and 2" in from the rear of the sleeve. (See Figures 12 and 13.)
These holes or other non-perforated locations in
the sides and/or top of the sleeve may be used to
fasten the sleeve to the wall from the inside. Never
secure the room cabinet/wall sleeve to the wall
through the bottom.
Caulk the outdoor joint between the room cabinet/
5.
wall sleeve and the wall opening (or louver frame):
top, bottom and both sides. Do not permit caulking
to block the weep holes.
5
⁄32" diameter
Figure 12.
Room cabinet/
wall sleeve
Finished Floor
Finished Wall
Subbase
2"
5
⁄32" Dia.
(typical of 2)
(86mm)
Louver Depth
Louver
Frame
Outside wall
2"
Figure 14.
Finished Wall
Finished Floor
Optional
Subbase
Lintel by
others
5
⁄32" Dia.
(typical of 2)
Louver
Depth
Mortar Base
Outside wall
Note: Subbase is optional on 208/230V units, but
standard on 265V.
Louver frame is optional on all units.
Install the outdoor louver. Holding the louver
6.
with a wire loop, or other similar means, push the
louver out through the rear opening in the room
cabinet/wall sleeve and pull the louver back to
the rear face so that the louver studs pass through
the holes in the room cabinet/wall sleeve ange.
Attach the louver with the washers and nuts, and
securely tighten the louver in place.
Cut the shipping carton as necessary to cover the
7.
installed room cabinet/wall sleeve until ready for
use.
3
3
⁄8"
IM 950-1 / Page 11 of 38
Heating/Cooling Chassis
CAUTION
Installation
1. Check the chassis for damage. Spin the fan wheels
manually to conrm free rotation. Check the refrigerant 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.
Check the interior of the installed room cabinet/
2.
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 retaining 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.
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, oors 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.
Release the top of the panel from the room cabinet/
2.
wall sleeve by depressing the two vertical buttons in the top of the black border
and/or by removing screws (Figure 13).
Figure 13.
Latching Button
Slot or sheetmetal
screws
Room cabinet/
wall sleeve
, if so equipped,
Optional
Louver Frame
Slide the chassis into the room cabinet/wall sleeve
3.
until rmly seated against the seal. Push the chassis on the capacitor box cover and/or sheetmetal
anges. 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 eld 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 rmly 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”.
Plug the electrical cord into the receptacle. Excess
4.
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.”
Air Filter
Front Panel
Subbase
Note: Subbase is optional in 208/230V unit, but
required on 265V. Louver frame is optional on all
units.
Tilt the panel out from the cabinet and allow the
3.
top to rest against your legs. Both hands are now
free to release the lter on the front side of the coil.
To remove the panel, lift it up to disengage the
4.
hinging tabs from the cabinet.
To install the front panel, insert the hinging tabs
5.
into the slots in the bottom of cabinet. Push the
top of front panel closed exerting sufcient thumb
pressure on the top of the black border area to allow the installation of the sheetmetal screws.
Replace the two sheetmetal screws adjacent to the
6.
latching buttons in the front panel (if so equipped)
or replace the two sheetmetal screws in the upper
left and right corners.
IM 950-1 / Page 12 of 38
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