McQuay PNSE2 Installation Manual

ENR & ENH Type 45
Replacement Chassis

Installation & Maintenance Data

IM 435-3

Group: PTAC
Part No.: 106018611
Date: May 1999

EXISTING
LOUVER

CHASSIS SIDE SEAL
(LEFT-HAND)

CHASSIS
TOP SEAL

CONDENSER COIL
BAFFLE SEAL

➤

➤

➤

CHASSIS

➤

➤

➤

➤

WALL SLEEVE
BOTTOM SEAL

CHASSIS SIDE SEAL
(RIGHT-HAND)

➤

➤

EXISTING
WALL SLEEVE

WALL SLEEVE
CHASSIS
SUPPORT
CHANNEL

©1999 AAF–McQuay Incorporated

IM 435-3 / Page 1 (Rev. 5/99)

Table of Contents

Recommended Spare Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Wall Sleeve Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Chassis Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Installing The Condenser Coil Baffle Seal . . . . . . . . . . . . . . . . . .

Additional Alteration With Heat Pump . . . . . . . . . . . . . . . . . . . .

Chassis Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Equipment Start-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Electrical Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Scheduled Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2

Troubleshooting Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2

Approximate Ship Weights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3

Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3
3
4
4
4
5
5

ENR (Electric Heat) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

ENH (Heat Pump) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

ENH (Heat Pump with Supplemental Hydronic Heat) . . . . .

ENR/ENH (Hydronic Heat) . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Nomenclature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Catalog Number Code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6,7

8-11

Installation

The installation of this equipment shall be in accordance with the regulations of authorities having jurisdiction and all
applicable codes. It is the responsibility of the installer to determine and follo w the applicable codes. Sheet metal parts, self­tapping screws, clips and such items inherently have sharp edges, and it is necessary that the installer exercise caution.
This equipment is to be installed only by an experienced installation company which employs trained personnel.

Inspection

When the equipment is delivered all items should be checked
carefully against the bill of lading to be sure all crates and car­tons have been received. All units should be carefully inspected
when received. If any damage is noticed, the carrier should make
proper notification on the delivery receipt acknowledging the dam­age. The carrier should also complete a carrier inspection report
and forward it to AAF–McQuay Incorporated.

The unit nameplate should be checked to be sure the voltage
agrees with the power supply available.
The ENR/ENH-45 is a replacement chassis for Singer and Ameri­can Standard T ype 45 units. It is designed to be installed into the
existing Type 45 wall sleeve using the retrofit kit provided with the
new chassis. Installation of this retrofit kit is described herein.
Do not install the chassis until the retrofit kit has been properly
installed on the chassis and in the wall sleeve.

The ENR/ENH-45 retrofit kit is packaged in a separate carton
and shipped in addition to the chassis. Careful inspection should

be made of the retrofit kit package to insure all components have
been included. The retrofit kit should include the following pieces:

No. of

Parts

Pieces

1. Wall sleeve bottom seal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2. Wall sleeve chassis support channel . . . . . . . . . . . . . . . . . . .

3. Chassis side seal (RH & LH 1 each) . . . . . . . . . . . . . . . . . . .

4. Chassis top seal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5. Condenser coil baffle seal . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6. Sheet metal screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

7. Tinnerman clips . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

If any of these pieces are missing from the retrofit kit package
notify AAF–McQuay Incorporated, Service Parts Dept., 13600
Industrial Park Blvd., Plymouth, MN 55440.

5

7

8

9
10
11
12
12

1

2

2

3

3
10

2

Figure 1. Exploded View of Retrofit Kit

WALL SLEEVE CHASSIS

SUPPORT CHANNELS

CONDENSER COIL

BAFFLE SEAL

CHASSIS SIDE SEAL

(LEFT-HAND)

CHASSIS TOP SEAL

REQUIRED FASTENERS

WALL SLEEVE
BOTTOM SEAL

CONDENSER COIL
BAFFLE SEAL

CHASSIS SIDE SEAL
(RIGHT-HAND)

CHASSIS TOP SEAL

CHASSIS TOP SEAL

IM 435-3 / Page 2 (Rev 5/99)

Wall Sleeve Preparation

CAUTION: Disconnect all power to the unit before continuing.

1. Remove existing chassis from wall sleeve and discard.

2. Clean existing wall sleeve to remove any residual dirt and
debris. If any rust exists, remove it with a wire brush or steel
wool then coat the spot(s) with rust inhibiting paint.

3. Inspect the condition of the wall sleeve and repair as required.
Be sure all wall sleeve gaskets are intact and repair as needed.

4. Locate the retrofit kit package and take out the wall sleeve
bottom seal and two chassis support channels.

5. Place the square edge of the chassis support channels into
the weephole slots of the existing wall sleeve. The slotted ends
of the chassis supports will extend toward the roomside of
the wall sleeve.

6. Place a heavy bead of RTV silicone sealant (or equivalent) to
the leading edge of the wall sleeve bottom seal. The leading
edge, is that edge that will be closest to the outdoor side of
the wall sleeve.

7. Place the wall sleeve bottom seal into the wall sleeve so that
the leading edge engages the slots of the chassis support
channels. Position the leading edge of the bottom seal ap­proximately 10

7

/8 inches from the rear of the wall sleeve. Be

sure the black rubber gasket of the wall sleeve bottom
seal is facing upward. Press down firmly on the chassis

bottom seal to insure a positive seal.

Chassis Preparation

1. Remove the chassis from the carton and place it on the floor
near the wall sleeve.

2. Remove the remaining retrofit kit parts from the package and
place them near their final installation position, as shown on
the front cover.

3. Locate the two side seals and mount them on the sides of the
chassis so that the gasket faces the outdoor side. This
requires that the existing screws be removed and reinstalled
through the side seals. Note also that the gasket of these side
seals extends beyond one end of each seal. This gasket
extension must be positioned towards the top.

4. Locate the three chassis top seal pieces and assemble them
for installation using the screws provided. If the unit has electric

8. Drill a

1

/8" diameter hole in each end of the wall sleeve using

the holes of the wall sleeve bottom seal as a template.

CAUTION: Drilling holes elsewhere in the wall slee ve will
destroy the weather integrity and could interfere with
chassis installation.

9. Fasten the wall sleeve bottom seal to the wall sleeve using
the (2) #8 x

3

/8 sheet metal screws supplied.

10. Caulk the ends of the wall sleeve bottom seal with RTV
silicone sealant (or equivalent) to insure weather integrety.
The bottom seal must be completely water tight to prevent
condensate from entering the indoor space.

Figure 2. Installation of Wall Sleeve Bottom Seal

CHASSIS

SUPPORT

CHANNELS

MOUNTING

SCREW

SEAL ALONG

THIS EDGE

EXISTING
WALL
SLEEVE

RAISED
RUBBER
GASKET

WALL
SLEEVE
BOTTOM
SEAL

heat, all (3) parts will be used. If the unit has hydronic heat,
only the front and right side pieces will be used.

5. Align the top seal with the perimeter of the chassis discharge
plenum and drill

1

/8" diameter holes in the discharge plenum

flange using the top seal as a template.

6. Fasten the top seal to the discharge plenum flange. NOTE:

Pop rivets must be used to secure the sides of this top
seal to the plenum flange to prevent interference with the
existing seals of the wall sleeve. Screws may be used to

attach the front portion of the top seal as no interference will
occur. NOTE: For hydronic units, the left-hand piece of the
top seal is discarded.

Installing the Condenser Coil Baffle Seal

1. Assemble the three pieces so as to form a "U" shape as shown
in Figure 1. Fasten these pieces together using the screws
provided.

2. Position the assembled seal against the condenser coil so
that the tangs of the assembly engage between the coil and
the chassis drain pan. The gasket of the condenser coil baffle
seal should rest tightly against the end plates of the condenser
coil. The installed condenser coil baffle seal is shown in
Figure 3.

3. Using the two Tinnerman clips supplied, attach the condenser
coil baffle seal to the condenser coil end plates 3" to 4" from
the top of the coil.

Additional Alteration with Heat Pump Models

Heat pumps generate condensate during the heating season that
must be disposed of using a drain kit. The drain kit is furnished
from the factory with all heat pump chassis, for field installation.
The following modifications must be made to the retrofit kit and
existing wall sleeve when using heat pumps.

Figure 3. Condenser Coil Baffle Seal

RIGHT-HAND

SIDE SEAL

TINNERMAN

CLIP

CONDENSER
COIL BAFFLE

SEAL

TANG

1. Using a hacksaw, Sawsall, or tin snips, cut a 5/8" x 5/8" slot in
the left-hand side seal of the retrofit kit. This slot should be
located 1/2" from the bottom of the wall sleeve. Align this slot
with the flange of the wall sleeve and cut an identical second
slot in flange of the wall sleeve.

IM 435-3 / Page 3 (Rev. 5/99)

CHASSIS
TOP SEAL

CONDENSER
COIL

2. Insert the copper tube into the wall sleeve. Be certain that the
drain tube extends well into the wall sleeve and maintains a
downward pitch to assure proper drainage.

3. The drain kit is designed to allow condensate to run into the
wall sleeve where it can be carried away through a condensate
drain system. To drain the condensate directly to the outside,
extend the drain tube using a second

5

/8" flexible polymer

connection and a piece of copper tube cut to the proper length.

4. Caulk around the tube that protrudes through the wall sleeve
side seal.

5. When the chassis is slid into place, be sure the drain tubes
engage properly, as shown in Figure 4.

Chassis Installation

Before installing the chassis, make the following visual and
mechanical inspection:

1. Rotate the condenser fan and evaporator fans to be sure they
spin freely . If they do not, make the necessary adjustments or
remove any obstruction.

2. Check the evaporator coil fins and the condenser coil fins
for damage. If any damage is minor, straighten fins with
the proper fin comb. If the damage is extensive, notify the
carrier immediately .

3. Check all fasteners and tighten as required.

4. Do not remove or loosen hold-down bolts on compressor
as they are properly adjusted at the factory.

5. Remove the cardboard base from the chassis and discard.

6. When installing the size 15 chassis, be sure to remove the
shipping angles. Instructions for removal of these angles can
be found attached to the top of the chassis.

Once the chassis inspection has been completed, proceed as
follows:

1. Align the chassis with the existing wall sleeve making sure
nothing is obstructing the opening to the wall sleeve.

2. Slide the chassis into the sleeve until it seats against the side
seals of the wall sleeve. CAUTION: Do not push on the coil
surface, control box or scroll housings when inserting the
chassis into place.

3. For units with 115V, 208V and 230V power cords, insert the
cord set through the opening in the base of the wall sleeve at
the right hand side.

Equipment Startup

Initial startup of the lncremental® conditioners by experienced
personnel is usually the responsibility of the installing contractor.
This startup consists of inspecting and operating the equipment
for all functions at the time of initial installation, and making
necessary adjustments. It also includes demonstrating its proper
operation to the owner or his agent. Note that unless otherwise
specifically agreed to in writing, McQuay includes no field labor,
startup service or the like in the price of its equipment. After
the equipment leaves the factory, it may become damaged or
maladjusted during transportation or on the job. Sometimes wires
are disconnected accidentally, or fan motors move on their bases
due to rough handling, causing fans to strike. The correction of
such conditions is part of the startup.

Before starting equipment, make certain that:

1. Correct voltage has been supplied to the equipment.

2. The electric plug from the control box has been inserted into

the receptacle. (If applicable).

IM 435-3 / Page 4 (Rev 5/99)

Figure 4. Optional Condensate Drain Kit

5

/8" DRAIN TUBE

WALL SLEEVE

CHASSIS

5

/8" FLEXIBLE
POLYMER
CONNECTION

4. Set the manual damper to the "open" or "closed" position as
desired. For units equipped witn the automatic damper, place
the switch to the "auto" or "closed" position as desired. In the
"auto" position, the damper is open whenever the indoor fan
motor is running. The "auto/closed" switch is located at the
bottom left-hand corner of the chassis.

5. For hydronic units, plug in the valve wires. A cord and plug is
supplied to match its existing receptacle.

6. For heat pump chassis, connect the drain tube of the chassis
with the drain pipe installed in the wall sleeve as shown in
Figure 4.

7. Install the evaporator drain pan cover on the indoor side of
the drain pan. This is done by setting the cover in place and
firmly pressing in and down on the cover until it drops into
place covering the exposed portion of the indoor drain pan.

8. For units equipped with 115V, 208V or 230V power cords,
insert the plug into the receptacle. Excess cord should be
coiled neatly beneath the unit or in the subbase.

9. For 265V units, make electrical connections to the pigtails
located inside the control box. A
conduit connection is provided at the bottom of the control box.

10.Insert the existing filter or replace with a new filter.

11.Replace the front panel making sure the tangs at the bottom
of the front panel engage properly in the wall sleeve. Swing
the front panel upward and lift slightly to engage the front
panel tangs with the slots in the existing wall sleeve.

During startup (applies only to standard equipment):

1. Set manual ventilation damper to OPEN or CLOSED position
as required by owner. Set "auto-off" switch as required if unit
is equipped with electric fresh air damper.

2. Push HIGH button to preselect fan speed; push HEAT button.
Move thermostat to the extreme heating position (counter­clockwise). Push LOW button; fan should change to low speed.
If it's a heat pump, the compressor and outdoor fan should
start. If it has hydronic heat, the valve should open.

3. Push HIGH button to preselect fan speed; push COOL but­ton. Move thermostat to the extreme cooling position (clock­wise). Compressor and outdoor fan should cycle on and off
as the thermostat requires. Push LOW button; fan should
change to lower speed. Outdoor fan should be on whenever
compressor operates.

4. Push OFF button. Fan should stop, and neither heater nor
compressor should continue to operate.

7

/8" diameter knockout for

Electrical Service

All wiring should be done in accordance with all local and
National Electrical Code requirements. The conditioners are
supplied as follows:

Type 45 Replacement Electrical Heating Unit:

1. 208V or 230V models are supplied with an attachment cord
and plug which exit from beneath the conditioner on the
control side. The cord has a usable length of 60" from where
it exits the conditioner. The use of an extension cord is not
recommended. Refer to the chassis nameplate to determine

Scheduled Maintenance

Incremental conditioners are built to last. With proper care, the
unit should provide uninterrupted service for many years. Sched­uled maintenance of this equipment, as described below, is the
key to the equipment's longevity.

Air Filters– Air filters must be cleaned at regular intervals. Twice
annually may be adequate in some areas while twice monthly
may be required in others. Areas with high dirt and lint content or
heavy usage of units require more frequent filter maintenance
than those areas of relatively clean operating or low usage
conditions. Unit malfunction may occur if air filters are not kept
clean. Rinse filters with hot water and a mild detergent. Let dry
and oil lightly to enhance dust collecting ability.

Chassis– It is recommended that every year the chassis be
removed for a thorough checkup. This should be completed as
follows:

1. Unplug unit from power source.

2. Remove front panel.

3. Remove chassis from cabinet and move it to the
maintenance department. Replace with spare chassis or
weather plate.

circuit ampacity and overcurrent protection. Time delay fuses
are recommended to avoid nuisance tripping. The receptacle
is generally mounted beneath the conditioner, on or recessed
in the wall so that it is concealed by the conditioner overhang.
The space under the conditioner must be at least 3" high.

2. On 265V models, the chassis is supplied with no cord. A knock­out is furnished in the control box to allow for field supplied
permanent connection. Electrical connections are made to
pigtails inside the control box.

3. Hydronic models include valve wiring and a plug to match the
existing valve.

6. Thoroughly clean discharge grilles.

7. Cover motors and control module with watertight material and
wash evaporator coil, condenser coil and base pan using hot
water and a mild soap. Do not use a harsh detergent for it
may corrode the aluminum fins.

8. Clean condensate drain and clear weep holes.

9. Dry equipment thoroughly, especially electric parts and
insulation.

10.Clean any rust spots with steel wool and paint with rust
inhibiting paint.

11.Clean insulation or replace if necessary.

12.Check all fasteners and tighten as required.

13.Clean and inspect damper door and linkage.

14.After the first year, oil fan motors. For 8 hour/day operation,
add 8 to 10 drops to each bearing. For 24 hour/day operation,
add 16 to 20 drops to each bearing. Use a commercial grade
electric motor oil or SAE #10 non-detergent motor oil.

4. Check all seals and insulation and repair as required.

5. Check all wiring and controls for hazardous conditions.

Recommended Spare Parts

An inherent advantage of the Incremental system is that failure
of any one part affects only one Incremental conditioner and does
not interrupt the operation of the rest of the system. A further
advantage is that a failed part can be quickly and easily replaced,
thus minimizing the inoperative time of the equipment. This is so,
however, only if a replacement part is quickly available. In order
to replace a failed part quickly and keep all Incremental condi­tioners in good operating condition, AAF-McQuay Incorporated
recommends that at the time Incremental conditioners are pur­chased, owners arrange for a small stock of replacement parts.

Where an owner carries such a stock, immediate replace-
ment of a defective part is possible. The defective part can then
be returned to the factory or one of its authorized service sta­tions. So long as it is still in warranty, it is repaired or replaced
and returned to the owner without cost for shop labor and mate­rial. Thus, the stock of replacement parts is constantly replen­ished. To the right is listed the kind of parts which are recom­mended to be carried in stock, together with the quantity of parts
recommended per 100 Incremental conditioners installed.

15. T est run chassis before re-installing or returning to spare parts
stock.

Qty. Per

Part Name

Cooling Chassis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Compressor Overload Device . . . . . . . . . . . . . . . . . . . . . . . .

Compressor Running Capacitor . . . . . . . . . . . . . . . . . . . . . .

Conditioned Air Fan Motor . . . . . . . . . . . . . . . . . . . . . . . . . . .

Condenser Fan Motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Pushbutton Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Damper Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Thermostat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Knob for Thermostat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Control Relay (if used) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Damper Motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Electric Resistance Heater (each size) . . . . . . . . . . . . . . . .

Touch-up Paint (1 pt. spray can) . . . . . . . . . . . . . . . . . . . . . .

Oil for Fan Motors (gallons) . . . . . . . . . . . . . . . . . . . . . . . . . .

For the current spare parts list, and applicable prices, see your
representative or write McQuay Service, P.O. Box 1551, Minne­apolis, MN 55440.

IM 435-3 / Page 5 (Rev. 5/99)

100 Units

1
1
1
1
1
2
2
2
6
1
2
1
1
1

Troubleshooting Chart

These items should be checked by a qualified service technician only.

TROUBLE CAUSE CURE

1. Blowers won't operate
on Cool.

2. Blowers operate on
COOL, but compressor
does not start.

3. Blowers run on COOL
and compressor starts,
but stops after a short
interval.

4. Blowers run on COOL
and compressor starts
and runs, but compres­sor occasionally stops
(on overload device).

5. Compressor starts and
runs on COOL, but
blowers do not run.

6. Compressor starts and
runs on COOL, but fan
motor starts, then
stops.

7. Equipment gives
electrical shock.

8. Insufficient cooling
capacity.

a. No power.

b. Faulty pushbutton switch.
c. Loose connections at pushbutton switch.

a. Thermostat set too high.
b. Heat valve is open and heat is on.
c. Low voltage.
d. Faulty pushbutton switch.
e. Faulty connection at pushbutton switch.
f. Defective wiring to thermostat.
g. Loose connections at compressor terminals.
h. Wiring to compressor terminals defective.
i. Loose connections in compressor overload device.
j. Starting capacitor malfunctions (open circuited, short

circuited or loss of capacity).

k. Defective compressor motor (short circuited, open circuited,

grounded).

a. Operation of overload device due to overloaded

compressor motor.

a. Low voltage due to overloaded circuits within building or

throughout the local power system. Due to varying power
demands, this condition might exist only at certain times
during the day or on very hot days.

b. High voltage due to fluctuations in local power system;

usually occurs at low load periods of the day.

c. Partial short circuit in compressor motor. Under normal

loading, a compressor with a partial short circuit might
appear to be operating all right; increased condensing air
temperature might then cause a short.

a. Faulty pushbutton switch.
b. Open circuited blower motor.
c. Blower rubbing against its housing.
d. Bearings on blower motor seized.

e. Loose connection at pushbutton switch.
a. Operation of the internally connected overload device due

to a short circuit in blower motor.

b. Windings, rubbing of blower motor or lack of lubrication in

blower motor bearings.

a. Grounded electrical circuit within chassis and/or faulty

chassis ground.

a. Insufficient airflow through condenser due to:

1) Dirty condenser.

2) Obstructed louvers on outer cabinet or wall box.

3) Condenser blower/fan not running.

4) Condenser blower/fan not up to speed.

5) Condenser blower/fan slipping on motor shaft.

6) Recirculation of condenser air.

b. Insufficient airflow through evaporator due to:

1) Dirty evaporator.

2) Ice on evaporator coils.

3) Dirty air filter.

4) Obstructed discharge grilles.

5) Evaporator blower motor not running.

6) Evaporator blower motor not up to speed.

7) Evaporator blower slipping on motor shaft.
c. Heat load in room exceeds capacity of equipment.
d. Windows and doors in room are open.
e. Compressor not pumping, indicated by:

1) Low wattage.

2) Condenser not warm, evaporator only partially cool, or

not at all.

a. Check supply line fuses, circuit breakers, and be sure

the power is on. Blown fuses would indicate circuit over­loading, a short circuit, or a grounded condition in the circuit.
Voltage supply to the equipment should be checked. Refer

to the chassis nameplate for the minimum voltage.
b. Replace.
c. Tighten.

a. Adjust. Rotate control knob to “Cooler.”
b. Close heat valve.
c. Check as above.
d. Replace.
e. Tighten.
f. Replace.
g. Tighten.
h. Replace.
i. Tighten
j. Replace.

k. *Ship cooling chassis prepaid to nearest McQuay author-

ized warranty station.
a. Check voltage supply. Clean condenser inside and out.

Check at outside face of condenser for recirculation of

condenser air. Put air “splitters” in, if missing. Check

to make sure condenser blower/fan is operating properly.

Check compressor for short circuit. If defective, *ship cool-

ing chassis to nearest McQuay authorized warranty station.
a. Run separate electric line to equipment. Consult local

power company.

b. Consult local power company.
c. If confirmed, *ship cooling chassis prepaid to nearest

McQuay authorized warranty station.

a. Replace.
b. Replace.
c. Adjust blower motor or blower wheel position.
d. Lubricate motor with SAE #10 oil. (It may be necessary to

remove blower assembly to do this.)
e. Tighten.

a. Adjust blower/fan wheel on shaft or blower motor mounting.

Lubricate with SAE #10 oil (see above).
b. Adjust blower wheel or motor or replace wheel.

a. Eliminate ground in chassis and/or check chassis ground.

a.

1) Clean.

2) Remove obstructions.

3) Check same as in the case of malfunctioning condi­tioner air blower.

4) Check for correct voltage. Oil blower motor if necessary.

5) Adjust blower position and tighten setscrew.

6) Correct as in #3.

b.

1) Clean.

2) Turn equipment off to let ice melt.

3) Clean or replace.

4) Remove obstructions. In case of top discharge equip­ment, make sure books, magazines, etc., are kept off
the equipment.

5) Checkt as in #1.

6) Check for correct voltage. Oil motor is necessary.

7) Adjust blower wheel position and tighten setscrew.

c. Refer to original load calculations; recalculate heat load.
d. Close them.
e. *Ship prepaid to nearest McQuay authorized warranty

station.

*If equipment is in warranty.

IM 435-3 / Page 6 (Rev 5/99)

Troubleshooting Chart (cont'd)

These items should be checked by a qualified service technician only.

TROUBLE CAUSE CURE

8. Insufficient cooling
capacity (continued).

9. Too much cooling.

10. “Sweating”

11. Blowers won't oper­ate on HEAT.

12. **Equipment is noisy.

13. Insufficient or no heat.

f. Restricted capillary tube or strainer, indicated by:

1) Frost on capillary or strainer.

2) Low wattage.

3) Condenser not warm.

4) Evaporator partially frosted, only partially cool, or not
at all.

a. Thermostat set too low.
b. Defective thermostat.

a. Condensate drain from evaporator to condenser plugged.
b. Insulating seals on equipment damaged.
c. Evaporator blower motor not up to speed.
d. Evaporator blower incorrectly positioned.

a. No power.
b. Faulty pushbutton switch.
c. Loose connections at pushbutton switch.
d. Thermostat set too low.

a. Blower rubbing against enclosure.
b. Blower motor bearings are dry.

c. Refrigerant absorbed in compressor oil after extended

shutdown.
d. Equipment improperly installed.
e. Loose electrical components.
f. Copper tubing vibrating.
g. Harmonics.

h. Loose sheet metal parts.
a. No steam or hot water being applied.

b. No power.

c. Faulty pushbutton switch.
d. Loose connection at pushbutton switch.
e. Thermostat set too high.
f. Thermostat faulty.
g. No power output on transformer secondary.
h. Inoperative valve.

1) Steam valve N/C.

2) Hot water valve N/C.

i. Outdoor temperature less than 40°F on heat pump.

f. *Ship prepaid to nearest McQuay warranty station.

a. Adjust.
b. Replace.

a. Remove obstructions to water flow.
b. Adjust or replace.
c. Check for correct voltage. Oil motor if necessary.
d. Adjust.

a. See #1.
b. Replace.
c. Tighten.
d. Adjust. Rotate control knob to “Warmer.”

a. Adjust fan position on motor shaft to reposition fan motor

bracket assembly.
b. Lubricate with SAE #10 oil or replace motor.
c. Noise will disappear after equipment runs awhile.

d. Make necessary adjustments to components.
e. Fasten securely.
f. Adjust by bending or applying tape.
g. Occasionally equipment will have noisy operation for no

apparent reason. Inspection has revealed no loose compo-

nents that might be the source of the noise. Due to the action

of the compressor, it is possible to have internal noise

develop if the refrigerant tubing has become bent even

slightly. To distinguish this condition from the simple rattle

producing vibration caused by loose screws, nuts and other

components, grasp the refrigerant tubing at various points

throughout the system until a point is found where the noise

is eliminated or reduced. Bend the copper tubing very gently

until the noise disappears.
h. Tighten.

a. Contact building management.
b. Check power supply line fuses, circuit breakers. Blown

fuses would indicate circuit overloading, a short circuit, or a

grounded condition in the circuit.
c. Replace.
d. Replace wire or tighten.
e. Adjust rotate knob to “Warm.”
f. Replace.
g. Replace.
h.

1) Temporarily lock valve open; replace.

2) Replace.

i. Review why supp. electric heat is NOT operating.

Notes:

† This guide was prepared with standard equipment in mind. If equipment is special, it may not be entirely applicable.
* If equipment is still in warranty.
**Note: Before trying to correct the noise, determine its cause: conditioned air blower, compressor or condenser blower. Operate the conditioned air blowers only. If

this doesn't cause the noise, operate on cooling. Then disconnect one compressor lead. If the noise stops, the compressor is the source. If not, it is caused
by the condenser blower.

Approximate Shipping Weights

ENR/ENH Size

07–150 Lbs.
09–150 Lbs.
12–150 Lbs.
15–160 Lbs.

Retrofit Kit–10 Lbs.

IM 435-3 / Page 7 (Rev. 5/99)

TION

F.

O

LEGEND

OL COMPRESSOR OVERLOAD

PB SWITCH–PUSHBUTTON

TH1 THERMOSTA T–ROOM AIR

OH SWITCH–OVERHEAT

SYMBOL DESIGNATION

LEGEND

C1/3 CAPACITOR

SYMBOL DESIGNATION

Standard Manual Changeover Control

N

277VAC

L1

Wiring Diagram – ENR Type 45 Replacement (Electric Heat)

L1 L2

208 & 240VAC

TH9 THERMOSTAT–LOW AMBIENT LOCKOUT (OPT.)

HTR1/2 HEATER–ELECTRIC

M1 MOTOR–ROOM AIR

M2 COMPRESSOR

M3 MOTOR–OUTDOOR AIR FAN

3

4

N

L1

RECP.

L1

(BY OTHERS)

SEQUENCE OF OPERA

TING WITH "HEA T" BUTTON DESPRESSED, ELEMENTS CYCLE TOMAINTAIN
HEA

L2

4

3

C1

HI

LO

PB

THERMOSTA T SETTING.

COOLING WITH "COOL" BUTTON DEPRESSED, COMPRESSOR AND CONDENSER FAN

3

WHT

BRN BRN

M1

SEE

TABLE

SEE NOTE 1

LO

HI

A

4

2

OFF

FANS RUN CONTINUOUSL Y AT SELECTED SPEED.

CYCLE TO MAINT AIN THERMOSTAT SETTING.

AN SPEED WITH FAN SWITCH ON CONTROL PANEL SET AT "HI" OR "LO", ROOM

ROOM F

HTR2

A

HEAT

1

TH1

2

2

L1

.)

(OPT
T
A

THERMOST

TH-9 PREVENTS OPERATION OF COOLING WHEN OUTDOOR

AMBIENT DROPS BELOW 40

LOCKOUT

AMBIENT

LOW

11

HTR1

10

OH

9

9

8

8

7

3

BRN

TH9

SEE NOTE 2

BRN

5

COOL

2

NOTES:

7

6

1. CAP ALL UNUSED LEADS.

2. TH9 & BRN CONNECTING LEAD REPLACE WIRE NO.7

3. MAKE ELECTRICAL INSTALLATION IN ACCORDANCE

C3

BRN BRN

M3

208V RED

SEE NOTE 1

WITH JOB WIRING DIAGRAM COMPLYING WITH

NATIONAL & LOCAL ELECTRICAL CODES.

12

C2

WHT

13
R

M2

C

230/277V BLK

OL

6

CONFIDENTIAL PROPERTY OF

AAF–MCQUAY INCORPORATED

LEGEND WIRING DIAGRAM SG-45

PLUG IN COMP TIE POINT UNIT MOUNTED THERMOSTAT

SPLICE OPTIONAL WIRING MANUAL CHANGEOVER

TAP CONN. WIRED BY OTHERS ELEC. HEAT 208/277V

TERM CONN. FACTORY WIRED PART

CAPPED WIRE GROUND NO. YE-1171A

14

S

RED

LOW

277 VOLT

BLK

HIGH

RED

LOW

240 VOLT

ORG

HIGH

BLU

LOW

208 VOLT

BLK

HIGH

IM 435-3 / Page 8 (Rev 5/99)

UNIT

TABLE A

SIZE

ALL

LEGEND

OL COMPRESSOR OVERLOAD

PB SWITCH–PUSHBUTTON

RV REVERSING VAL VE

SYMBOL DESIGNATION

TDR1 RELA Y–TIME DELA Y

TH1 THERMOSTA T–ROOM AIR

TH9 THERMOSTA T–LOW AMBIENT LOCKOUT

F) ELECTRIC ELEMENT CYCLES

O

F) TO MAINTAIN THERMOSTAT

O

TION

SEQUENCE OF OPERA

REVERSE CYCLE

F.

O

T
A

FAN CYCLES (OUTDOOR AMBIENT ABOVE 40

CIRCUIT BREAKER (OPT.)

LEGEND

EE ELECTRIC ELEMENT

M1 MOTOR–ROOM AIR

M2 COMPRESSOR

M3 MOTOR–OUTDOOR AIR FAN

SYMBOL DESIGNATION

C1/3 CAPACITOR

N

OH OVERHEAT SWITCH

4

3

L2

4

3

N

Standard Manual Changeover Control

L1

RECP.

(BY OTHERS)

L2

PLUG

L1

L1

PB

2

OFF

L1

Wiring Diagram – ENH Type 45 Replacement

(Heat Pump with Supplemental Electric Heat)

277VAC

L1

L2

208,240VAC

L1

HEATING WITH "HEAT" BUTTON DEPRESSED, COMPRESSOR AND OUTDOOR AIR

2

WHT

C1

BRN

BRN

M1

A

SEE

TABLE

SEE NOTE 1

HI

LO

HI

LO

A

4

3

2

COOL

5

1

RUN CONTINUOUSLY AT SELECTED SPEED.

REQUIREMENTS, (OUTDOOR AMBIENT BELOW 40

TO MAINT AIN THERMOST AT REQUIREMENTS.

AND OUTDOOR AIR F AN CYCLE T O SATISFY THERMOSTAT REQUIREMENTS.

AN SPEED WITH FAN SWITCH ON CONTROL PANEL SET AT "HI" OR "LOW", ROOM FANS

COOLING WITH "COOL" BUTTON DEPRESSED, REVERSING V ALVE ENERGIZED, COMPRESSOR

ROOM F

42

RV

43

1

3

8

HEAT

BRNBRN

2

98

46

WHT

C3

M2

M3

BLK

230&277V

208V RED

SEE NOTE 1

15

TH9

TDR1

3

2

H

45

1

H

47

16

THERMOST

(TH9) PREVENTS OPERATION OF COMPRESSOR WHEN OUTDOOR

AMBIENT DROPS BELOW 40

LOCKOUT

AMBIENT
LOW

12

C2

14

13

S

R

C

EE

OL

6

3

TDR1

1

6

7

9

11

10

OH

9

DIAGRAM, COMPLYING WITH NATIONAL AND LOCAL CODES.

1. CAP ALL UNUSED LEADS.

2. MAKE ALL CONNECTIONS IN ACCORDANCE WITH JOB WIRING

NOTES:

RED

LOW

277 VOLT

BLK

HIGH

RED

LOW

240 VOLT

ORG

HIGH

BLU

LOW

208 VOLT

BLK

HIGH

ALL

SIZE

UNIT

TABLE A

IM 435-3 / Page 9 (Rev. 5/99)

CONFIDENTIAL PROPERTY OF

AAF–MCQUAY INCORPORATED

LEGEND WIRING DIAGRAM SG-45

PLUG IN COMP TIE POINT UNIT MOUNTED

SPLICE OPTIONAL WIRING THERMOSTAT– NO SETBACK

TAP CONN. WIRED BY OTHERS ELEC. HEAT 208/277 VOL T

TERM CONN. FACTORY WIRED PART

CAPPED WIRE GROUND NO. YE-1173

LEGEND

RV REVERSING V ALVE

SW2 SWITCH–VENT MOTOR

LEGEND

Standard Manual Changeover Control

Wiring Diagram – ENH Type 45 Replacement

(Heat Pump with Supplemental Hydronic Heat)

IM 435-3 / Page 10 (Rev 5/99)

TDR1 RELA Y–TIME DELA Y

SYMBOL DESIGNATION

C1/3 CAPACITOR

M1 MOTOR–ROOM AIR

M2 COMPRESSOR

SYMBOL DESIGNATION

N

277VAC

L1

208,240VAC

TH1 THERMOSTA T–ROOM AIR

TH9 THERMOSTA T–LOW AMBIENT LOCKOUT

V1 VALVE–MOT ORIZED (N.C.) (BY OTHERS)

X1 TRANSFORMER 24V CLASS 2

M3 MOTOR–OUTDOOR AIR FAN

M4 MOTOR–VENT

OL COMPRESSOR OVERLOAD

PB SWITCH–PUSHBUTTON

3

4

N

L1

L1 L2

RECP.

L2

L2

(BY OTHERS)

L1

L1

F) MOTORIZEDC V ALVE

O

F) TO MAINTAIN THERMOSTAT

TION

O

SEQUENCE OF OPERA

CYCLES (OUTDOOR AMBIENT ABOVE 40

CYCLES TO MAINT AIN THERMOST AT REQUIREMENTS.

HEATING WITH "HEAT" BUTTON DEPRESSED, COMPRESSOR AND OUTDOOR AIR FAN

4

L1

PB

REQUIREMENTS, (OUTDOOR AMBIENT BELOW 40

3

OFF

COOLING WITH "COOL" BUTTON DEPRESSED, REVERSING V AL VE ENERGIZED,

2

31

C1

ORG

BRN

M4

ORG

SEE NOTE 1

HI

LO

SW2

32

2

COOL

COMPRESSOR AND CONDENSER FAN CYCLE TO SATISFY THERMOSTAT

REQUIREMENTS.

WHT

BRN

M1

SEE

TABLE

LO

HI

A

4

2

5

WITH VENT SWITCH IN "AUTO" POSITION, VENT DAMPER OPENS

FANS RUN CONTINUOUSL Y AT SELECTED SPEED.

DAMPERS

AN SPEED WITH FAN SWITCH ON CONTROL PANEL SET AT "HI" OR "LO", ROOM

ORIZED VENT

ROOM F

MOT

42

BRN

C3

BRN

RV

A

43

SEE NOTE 1

TH1

1
3

3

HEAT

TH9

15

2

8

8

9

F.

O

.)

(OPT
T
A

THERMOST

WHEN "COOL" OR "HEAT" BUTT ON IS DEPRESSED WITH VENT

WHT

M3

208V RED

SWITCH IN "CLOSED" POSITION, VENT DAMPER REMAINS CLOSED.

VENT SWITCH IS CONCEALED BEHIND FRONT PANEL.

(TH-9) PREVENTS OPERATION OF COMPRESSOR WHEN OUTDOOR

AMBIENT DROPS BELOW 40

LOCKOUT

NOTES:

AMBIENT

LOW

46

12

19

C2

28

YEL

14

13

S

R

X1

C

M2

TDR1

OL

H

H

& 277V BLK

45

TDR1

47

1

3

2

16

6

7

6

3

1

208V(RED),

V1

24V

27

BLU

277V(BRN)

240V(ORG),

WIRING DIAGRAM, COMPLYING WITH NATIONAL AND LOCAL

CODES.

1. CAP ALL UNUSED LEADS.

2. MAKE ALL CONNECTIONS IN ACCORDANCE WITH JOB

RED

LOW

277 VOLT

BLK

HIGH

RED

LOW

240 VOLT

ORG

HIGH

BLU

LOW

208 VOLT

BLK

HIGH

ALL

SIZE

UNIT

TABLE A

REVERSE CYCLE

CONFIDENTIAL PROPERTY OF

AAF–MCQUAY INCORPORATED

LEGEND WIRING DIAGRAM SG-45

PLUG IN COMP TIE POINT UNIT MOUNTED

SPLICE OPTIONAL WIRING THERMOSTAT– NO SETBACK

TAP CONN. WIRED BY OTHERS WET HEAT 208/277 VOL T

TERM CONN. FACTORY WIRED PART

CAPPED WIRE GROUND NO. YE-1172

Standard Manual Changeover Control

Wiring Diagram – ENR Type 45 Replacement (Hydronic)

LEGEND

SYMBOL DESIGNATION

120 & 277 VAC

C1/3 CAPACITOR

M1 MOTOR–ROOM AIR

M2 COMPRESSOR

4

N

N

L1

L1

L2

M3 MOTOR–OUTDOOR AIR FAN

M4 MOTOR–VENT

OL COMPRESSOR OVERLOAD

PB SWITCH–PUSHBUTTON

SW2 SWITCH–VENT MOTOR

TH1 THERMOSTA T–ROOM AIR

TH9 THERMOSTA T–LOW AMBIENT LOCKOUT(OPT .)

V1 VALVE–MOT ORIZED (N.C.) (BY OTHERS)

X1 TRANSFORMER–CLASS 2

3

L2

4

3

C1

TION

SEQUENCE OF OPERA

TING WITH "HEA T" BUTTON DEPRESSED, MOT ORIZED V ALVE CYCLES TO SATISFY
HEA

3

BRN

WHT

BRN

M1

A

SEE

TABLE

SEE NOTE 1

HI

LO

SW2

LO

HI

A

THERMOSTA T REQUIREMENTS.

CYCLE TO SA TISFY THERMOSTAT REQUIREMENTS.

AN SPEED WITH FAN SWITCH ON CONTROL PANEL SET AT "HI" OR "LO", ROOM

COOLING WITH "COOL" BUTTON DEPRESSED, COMPRESSOR AND CONDENSER FAN

ROOM F

12

C2

31

M2

M4

ORG ORG

32

OL

120 V.

14

13

S

R

C

6

6

7

WITH VENT SWITCH IN "AUTO" POSITION, VENT DAMPER OPENS

WHEN "COOL" OR "HEAT" BUTT ON IS DEPRESSED WITH VENT

FANS RUN CONTINUOUSL Y AT SELECTED SPEED.

BLK

208/277V

SEE NOTE 1

SWITCH IN "CLOSED" POSITION, VENT DAMPER REMAINS CLOSED.

VENT SWITCH IS CONCEALED BEHIND FRONT PANEL.

DAMPER

ORIZED VENT
MOT

C3

YEL

BLK

WHT

X1

BRN

BRN

M3

208V RED

24V

BLK

BLU

120,230 & 277V

F.

O

.)

(OPT
T
A

THERMOST

TH-9 PREVENTS OPERATION OF COOLING WHEN OUTDOOR

AMBIENT DROPS BELOW 40

COMPLYING WITH NATIONAL AND LOCAL CODES.

1. CAP ALL UNUSED LEADS.

2. TH9 & BRN CONNECTING LEAD REPLACE WIRE NO.7

LOCKOUT

AMBIENT

LOW

28

V1

27

3. MAKE ALL CONNECTIONS IN ACCORDANCE WITH JOB WIRING DIAGRAM,

NOTES:

RED

LOW

277 VOLT

ORG

HIGH

CONFIDENTIAL PROPERTY OF

AAF–MCQUAY INCORPORATED

LEGEND WIRING DIAGRAM SG-45

PLUG IN COMP TIE POINT UNIT MOUNTED THERMOSTAT

SPLICE OPTIONAL WIRING MANUAL CHANGEOVER

TAP CONN. WIRED BY OTHERS WET HEAT 120,208,240 OR 277 VOLT

TERM CONN. FACTORY WIRED PART

CAPPED WIRE GROUND NO. YE-117OB

208 & 240 VAC

L1

RECP.

(BY OTHERS)

PLUG

L1

4

BRN

208V(RED)

277V(BRN)

8

9

HEAT

8

240V(ORG)

7

SEE NOTE 2

TH9

BRN

1

TH1

2

3

2

5

L1

L1

PB

OFF

COOL

2

2

240 VOLT

120 or 277 VOLT

UNIT

TABLE A

BLU

LOW

BLK

HIGH

RED

LOW

BLK

HIGH

ALL

SIZE

IM 435-3 / Page 11 (Rev. 5/99)

Model Nomenclature

EN R 007 A 03 32

Type 45 Replacement Chassis

Unit Type

R = Air Conditioner
H = Heat Pump

Unit Size

007 = Nominal 7,000 BTUH
009 = Nominal 9,000 BTUH
012 = Nominal 12,000 BTUH
015 = Nominal 15,000 BTUH

Unit Vintage

Installation, Service and Warranty Policy

One-Year Warranty of Entire Conditioner

AAF–McQuay Incorporated, hereinafter referred to as the
“Company,” warrants to the original owner that each entire
Incremental Comfort Conditioner is free from defects in material
and workmanship. Any part or portion thereof which becomes
defective under normal use during the period of this warranty will
be repaired or replaced provided the Company’s examination shall
prove to its satisfaction that the part was or became defective
under normal use. This warranty contemplates that first year
maintenance labor was arranged for with the installer or
otherwise at the time the conditioner was purchased or installed.
The Company’s examination shall prove to its satisfaction that
the part was or became defective under normal use. This
warranty contemplates that first year maintenance labor was
arranged for with the installer or otherwise at the time the
conditioner was purchased or installed. The Company’s
obligations under this warranty are limited to: (a) repairing the
defective part or (b) furnishing a replacement part provided the
defective part is returned to the factory, transportation charges
prepaid. No reimbursement will be made for expenses incurred
in making field adjustments or replacements unless specifically
authorized in writing by the Company.

This warranty constitutes the buyer’s sole remedy. It is
given in lieu of all other warranties. There is no implied
warranty of merchantability or fitness for a particular pur­pose. In no event and under no circumstance shall the
Company be liable for incidental or consequential damages,
whether the theory be breach of this or any other warranty,
negligence, or strict tort.

No person (including any agent, salesman, dealer or
distributor) has authority to expand the Company’s obligation
beyond the terms of this express warranty, or to state that the
performance of the product is other than that published by the
Company .

Auxiliary Heat

YY = None
HH = Hydronic
18 = 1.8 KW
24 = 2.4 KW
32 = 3.2 KW
43 = 4.3 KW
48 = 4.8 KW

Voltage

11 = 120/60/1
03 = 208/60/1
39 = 240/60/1
40 = 277/60/1

One-Year Refrigeration Circuit Warranty

Hermetically sealed motor-compressor assemblies and all
components of refrigeration circuits not readily separable
therefrom are warranted to the original owner for one (1) year.
Refrigerating circuits consist of the motor-compressor assembly,
evaporator coil, condenser coil and interconnecting tubing.
Repairs under this warranty will be made at the Company’s
expense provided that the refrigeration circuit is delivered,
without shipping damage, transportation prepaid to the factory
or to a factory designated repair station, at the Company’s
option. This one-year warranty does not include any other parts
of the equipment such as filters, capacitors, protective devices,
or wiring. The Company is not obligated under this warranty for
field labor such as service for inspection, removing, packing
and/or re-installing the refrigeration circuit, nor for return
transportation charges.

General Conditions

The above warranties are void if the Company’s equipment has
been damaged, misused, subjected to abnormal use or service
or its serial number has been altered, defaced or removed, or
payment for the equipment is in default. The Company is not
responsible for service to correct conditions due to misapplication,
improper installation, inadequate wiring, incorrect voltage
conditions or unauthorized opening of the refrigeration circuit,
nor for consequential damages. In case the Company’s equipment
is installed in conjunction with cabinets, grilles, louvers, controls
or other parts manufactured by others, these warranties shall
apply only to the Company’s manufactured portion of the
equipment. The conditions of the warranty plan are effective for
eighteen (18) months from date of factory shipment. The
Company reserves the right to make a handling and inspection
charge in the case of parts or equipment improperly returned as
defective and/or as being in warranty.

AAF–McQuay Incorporated
4900 Technology Park Boulevard, Auburn, New York 13021-9030 USA [phone]

Printed on recycled paper containing at least 10% post-consumer recycled material.

IM 368-6 / Page 12 (Rev. 5/99)