McQuay M5WM10F, M5LC15C, M5LC10C, M5WM15F, M5WM20F Installation And Maintenance Manual

M5WM Wall Mounted Split Type Air Conditioner (SEER 13)

Indoor Unit

Outdoor Unit

Installation and Maintenance Manual

IM-5WMF (SEER13)-0706-McQua

y

Group: Wall Mounted
Part Number: R08019028218
Date: July 2006

Wireless Remote
Control (Standard)

Wired Wall Control

(Optional)

Table of Contents

General Information……………………………………………….. 3

Safety Precautions………………………………………. 3

Unit Dimensions…………………………………………….……... 4

Indoor Units ……………………………………. ……....4

Outdoor Units …………………………….…….. ……....4

Installation Guidelines……………………………………………... 7

Installation Diagram……………………………………... 7
Installation of Outdoor Unit……………………………... 7

Condensed Water Disposal of Outdoor Unit……. ……....7

Outdoor Unit Clearances…………………………… 7

Installation of the Indoor Unit…………………………… 7

Indoor Unit Clearances …………………………….8

Piping ……………………....................................... 8

Mounting Plate Installation ……………….. ………8
Installing Unit on Mounting Plate ………….………9

Drain Hose Installation .................. .............. ………9

Refrigerant Tubing…………………………………………………. 10

Tubing Length & Elevation………………………………10
Tubing Preparation………………………………………. 10
Tubing Connection To Units …………..………. ………10

Electrical Connections …………………………..………... ………11

Cooling Unit ………………………...…………. ………11

Heat Pump Unit ………………………............... ………11

Wiring Diagrams ……………………………….................. ………12

Vacuuming and Charging………………………………………….. 18

Purging the Piping and the Indoor Unit…………………. 18

Additional Charge……………………………………….. 18

Charge Operation………………………………………... 18

Special Precaution When Dealing with R410A unit……. 19

Model Numbers

Cooling Only

Indoor Unit Outdoor Unit Nominal Cooling – BTUH

M5WM10F M5LC10C 9000
M5WM15F M5LC15C 12,000
M5WM20F M5LC20C 17,500
M5WM25F M5LC25C 23,000

Cooling/Heat Pump

Indoor Unit Outdoor Unit Nominal Cooling - BTUH Nominal Heating - BTUH

M5WM10FR M5LC10CR 9000 8800
M5WM15FR M5LC15CR 12,000 12,000
M5WM20FR M5LC20CR 17,500 18,000
M5WM25FR M5LC25CR 23,000 23,500

Page 2 IM-5WMF(SEER13)-0706

Unit Indicator Lights ……………………………................ 19

IR Signal Receiver ………………...…………… 19

Cooling Only Unit ……………………............... 19

Heat Pump Unit ………………………............... 20

Special Features …………………………………..….......... 21

Dry Mode ……………………………..…........... 21

Heat Mode (Heat Pump Only) ………..………... 21
Air Flow Control ………………………..……… 21
Hot Keep (for Heat Pump Only) ………..……… 21
Overheating Protection (Heat Pump Only) ……... 21
Frost Prevention ………………………………... 21
Fan Speed and Rated Cooling Capacity ……….. 21

Main Filters ……..………………………............ 21

Cooling ……………..………………………….. 21

Electrostatic Air Purifying Filter …………......... 21

Deodorizing Filter ………………………..…….. 21
Filter Replacement ……………………………... 21
Auto Random Re-start Function ……………….. 22

Low Ambient Kit ………………………………. 22
Minimum and Maximum Operating Temperature….. 22
Remote Controller Operation Guide ……………………… 23
Service and Maintenance …………………………………. 25

Maintenance Schedule …………………………. 25

Troubleshooting ………………………………... 25

General Information

IM-5WMF(SEER13)-0706 Page 3

This manual provides the installation
procedures so your air conditioner unit
operates properly and provides you the service
it was designed to provide.
Special adjustment may be necessary to suit
local requirements. Before using your air
conditioner, please read this instruction manual
carefully and keep it for future reference.

Safety Precautions

Before installing the air conditioner unit, please
read the following safety precautions carefully.

WARNING

• The installer must determine and follow all
applicable codes and regulations. This
equipment presents hazard of electricity, rotating
parts, sharp edges, heat and weight. Failure to
read and follow these instructions can result in
property, severe personal energy or death. This
equipment must be installed by experienced,
trained personnel only.

• Improper installation can cause equipment
damage, service personnel injury or death.

• Do not allo w flammable fumes near unit or areas
sharing ventilation.

• Installation and maintenance must be performed
by qualified persons who are familiar with local
code and regulations, and experienced with this
type of appliance.

• All field wiring must be done in accordance with
industry standards and local codes.

• Inspect the unit nameplate to be certain the
voltage is the same as the voltage that will be
delivered to the unit. Improper electrical wiring
can cause property damage, severe personal
energy or death.

• The unit must be GROUNDED.

• Make sure wiring does not touch refrigerant

piping, compressor, or any moving parts of the
fan motors.

• Confirm that the power supply is switched OFF
before installing or servicing the unit.

WARNING

Hazardous Voltage!

Disconnect all electrical power including remote
disconnects before servicing. Failure to disconnect
power before servicing can cause severe personal

CAUTION

Use copper conductors only. Unit terminals are not
designed to accept other types of conductors. Failure
to do so may cause damage to the equipment.

CAUTION

•

Do no install in a laundry room. Humidity and laundry

chemicals can corrode unit components.

• Do not install the unit where leakage of flammable
gas may occur. If gas leaks and accumulates ar ound
the unit, it may cause a fire.

• Connect drainage piping properly. If drainage piping
is not connected properly, water leakage can cause
property damage.

• Do not overcharge the unit. This unit is factor y pre­charged. Overcharge will cause over-current or
damage to the compressor.

• Keep panel closed. Unsecured panels will cause the
unit to operate noisily.

NOTICE

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 follow:

VISIBLE LOSS OR DAMAGE

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 r esult i n
the carrier’s refusing to honor a damaged claim. The
form required to file such a claim will be supplied by the
carrier.

CONCEALED LOSS OR DAMAGE

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 fo r
inspection by the carrier’s agent within fifteen (15) days
of the delivery date. File a claim with the carrier since
such damage is the carrier’s responsibility.

Unit Dimensions

Model: M5WM10F, 10FR – Indoor Unit

Model: M5WM15F, 15FR, 20F, 20FR – Indoor Unit

Page 4 IM-5WMF(SEER13)-0706

Model: M5WM25F, 25FR – Indoor Unit

Model: M5LC10C, 10CR, 15C, 15CR – Outdoor Unit

IM-5WMF(SEER13)-0706 Page 5

Dimension

A B C D E F G H
10C/CR 33-5/8” 24-3/4” 12-7/8” 7/8” 2-5/8” 23-3/4” 5” 15-3/8”
15C/CR 33-5/8” 28-3/4” 12-7/8” 7/8” 2-5/8” 23-3/4” 5” 15-3/8”

Dimension

I J K L M

10C/CR

5/8” 14-1/4” 6-1/2” 3” 2-7/8”

15C/CR

5/8” 14-1/4” 6-1/2” 3” 2-7/8”

Model: M5LC20C, 20CR, 25C, 25CR – Outdoor Unit

Page 6 IM-5WMF(SEER13)-0706

Installation Guidelines

Installation Diagram

Condensate Disposal of Outdoor
Unit (Heat Pump Unit Only)

• There are 2 holes on the base of outdoor unit

for condensed water to flow out. Insert the
drain elbow to one of the holes.

• To install the drain elbow, first insert one

portion of the hook to the base (portion A), then
pull the drain elbow in the direction shown by
the arrow while inserting the other portion to
the base. After installation, check to ensure that
the drain elbow clings to base firmly.

• If the unit is installed where the condensate

may freeze in the base, remove plug at the
bottom of unit for better drainage

• See Figure 2.

Figure 2. Condensate Disposal of Outdoor Unit
(Heat Pump Unit Only)

Installation of the Indoor Unit

Indoor Unit Clearance

The indoor unit must be installed in a manner
to prevent mixing the discharged air with the
return air. Please follow the installation
clearances shown in Figure 3. Do not place the
indoor unit in direct sunlight. The location must
be suitable for piping and drainage, and be
away from doors or windows.

Figure 3. Indoor Unit Minimum Clearances

Installation of Outdoor Unit

Outdoor Unit Clearances

Install the outdoor unit in a manner to prevent mixing hot
discharged air with return air flow. Also the unit should be a
suitable distance from obstructions See Figure 1 for installation
clearances. Double the dimensions shown if surroundings are
more than 72” tall, or if there is an obstruction on top. Select the
coolest possible place where intake air temperature is not greater
than the outside air temperature (maximum 113ºF).

Figure 1. Outdoor Unit Minimum Clearances

IM-5WMF(SEER13)-0706 Page 7

Indoor Unit

Room
Cabinet

Remove side plate
when connecting the
piping and power
supply

Page 8 IM-5WMF(SEER13)-0706

Piping

The refrigerant piping can enter the indoor unit at several
different locations. Use the knock outs provided in the room
cabinet. See Figure 4.

Figure 4. Indoor Unit

Bend the pipes carefully to prevent kinks and r estrictions.
It’s best to use a tube bender. The condensation drain hose
can be taped to the pipes. See Figure 5.

Figure 5. Rear View of Indoor Unit

Mounting Plate Installation

The mounting plate ships attached to the back of the
indoor unit. To detach for mounting on wall, remove
plastic rivet from bottom (pry loose with a knife blade)
and unhook.

The wall must be strong enough to suppor t the weight
of the unit. If necessary, reinforce the wall. Drill holes in
plate to align with wall studs and attach with four (4)
screws.

If the refrigerant piping is going thru the wall behind the
indoor unit, provide a 2-1/2” hole that is slightly pitched
to the outside. See Figure 6. Hole must be located in
alignment with the arrows on the mounting plate . See

Figure 7.
Figure 6. Wall Opening for Piping

Figure 7. Mounting Plate/Wall Opening

IM-5WMF(SEER13)-0706 Page 9

Installing Unit on Mounting Plate

Hook the indoor unit onto the upper portion of th e mounting
plate (engage the two hooks at the rear top of the indoor
unit with the upper edge of the plate). Properly seat the
hooks and replace the plastic rivet at the bottom.

Figure 8. Installing Unit on Mounting Plate

Drain Hose Installation

The condensate drain hose (20” long) come factory
attached to the indoor unit. It is gravity flow. Avoid
situations that could restrict drainage. See Figure 9.

Figure 9. Drain Hose Installation

Page 10 IM-5WMF(SEER13)-0706

Refrigerant Tubing

Tubing Length & Elevation

Copper tubing to connect the indoor and outdoor units is
supplied by others or it can be ordered from the factory.
See Table 1 for requirements. Cover b oth tubes in dividually
with 3/8” wall foam insulation.

Table 1. Refrigeration Tubing Requirements

Model 10 15 20 25

Maximum length, ft., L

40 40 50 50

Max. elevation, ft., H

16 16 26 26

Max. number of bends

10 10 10 10

Liquid tube size – OD

¼” ¼” ¼” ¼”

Gas tube size - OD

3/8” ½” ½” 5/8”

Note: The refrigerant pre-charged in the outdoor unit is for tubing length up
to 25ft. See Table 5, page 18 for additional R410A refrigerant required on
longer runs.

Figure 10. Tubing Length and Elevation

Tubing Preparation

• Do not use contaminated or damaged copper tubing. Do
not remove plastic, rubber plugs and brass nuts from the
valves, fittings, tubings and coils until you are ready to
connect suction or liquid line into valves or fittings.

• If any brazing work is required, ensure that the nitrogen
gas is passed through coil and joints while the brazing
work is done. This will eliminate soot formation on the
inside wall of the copper tubing.

• Cut the copper tubing with a tube cutter. See Figure 11.

• Remove burrs from cut ends by holding tubing

downwards to prevent metal chips from entering the
tubing.

• Slide the flar e nuts, for both the indoor unit and outdoor
unit onto the copper tubing.

• Flare the tubing as shown in Figure 11, Figure 12 and
Table 2.

• The flare must be even and not cracked or scratched.

Figure 11. Cutting and Flaring Tube

Table 2: Tube Flaring Dimensions

Tube Diameter - OD X (in.)

Inch Imperial Rigid

¼ .051 .028

3/8 .063 .039

½ .075 .051

5/8 .087 .067

Tubing Connection To Units

•

Connect the copper tubing to both the indoor and
outdoor units. See Figure 12.

•

Torque each flare nut to specifications. See Table 3.

• Cover both tubes individually with 3/8” minimum wall
foam insulation.

Table: Flare Nut Torque Specifications

Tube Size (in.) Torque (ft./lb.)

¼ 13.3

3/8 31.0

½ 40.6

5/8 48.0

Figure 12. Flare Tubing Connections

H L

Outdoor Unit

IM-5WMF(SEER13)-0706 Page 11

Electrical Connections

• Wiring must be in accordance with all applicable
electrical codes.

• Wires must not touch the refrigerant piping,
compressor or any moving part.

• All electrical field wiring must be clamped at both the
indoor unit and the outdoor unit. See Figure 14 for
typical clamp.

• See Table 4, figure 13 and Figure 15 for the number
of wires, wire gauge and fuse/circuit breaker size
required.

Table 4: Wire and Fuse/Breaker Requirements

10/15

Unit Size

Indoor Outdoor

20/25

Voltage-1Ph/60Hz

115V 208/230V 208/230V

Power supply wire size
Number of wires

14 ga.

2 + gnd.

14 ga.

2 + gnd.

12ga.

2 + gnd.

Connecting wire size
Number of wires – A/C
Number of wires - HP

14 ga.

2
4

14 ga.
3 + gnd.
5 + gnd.

Fuse/Breaker size

15 amp 15 amp 20 amp

* Not including the Outdoor Coil Sensor Cable.

Figure 13. Cooling Only Size 10 & 15

Indoor Unit Outdoor Unit
Terminal Block Connecting Wires Terminal Block

COMP

N2

N1

L

NEC requires an approved
electrical disconnect within sight
of the unit so that anyone
working on the unit can turn the
power off and see that its not
accidentally turned back on. This
will require two disconnects, one
by the outdoor unit and one by
the indoor unit.

COMP

N2
N1

L

Power
supply

208/230V

!

L2

L1

N
L1

Power
supply
115V

Figure 14. Terminal Block and wire Clamp

Figure 15. Heat Pump Unit Size 10 & 15

4WV

OF

Comp

N2
N1

L

4WV

OF

Comp

N2
N1

L

!

Power
supply

208/230V

L2

L1

N
L1

Power
supply
115V

Outdoor coil sensor, 2 conductor cable, (26 feet long)
shipped with the indoor unit. Extend with 22 ga. low voltage
wire if not long enough to reach outdoor unit.

Indoor Unit
Terminal Block

Outdoor Unit
Terminal Block

Connecting Wires

NEC requires an approved
electrical disconnect within
sight of the unit so that
anyone working on the unit
can turn the power off and
see that its not accidentally
turned back on. This will
require two disconnects, one
by the outdoor unit and one
by the indoor unit

WARNING

Improper installation can cause severe personal
injury or death. Wiring must be done by a qualified
electrician in compliance with local codes. Model
10F, 10FR, 15F and 15FR are using two separate
power supply. Indoor unit powered by
115V/1Ph/60Hz. Outdoor unit powered by 208­230V/1Ph/60Hz.

Page 12 IM-5WMF(SEER13)-0706

Indoor Unit Outdoor Unit
Terminal Block Connecting Wires Terminal Block

COMP

N2

N1

L

NEC requires an approved
electrical disconnect within sight
of the unit so that anyone
working on the unit can turn the
power off and see that its not
accidentally turned back on. This
will require two disconnects, one
by the outdoor unit and one by
the indoor unit.

COMP

L1
L2

L1
L2

!

Power
supply

208/230V

L2

L1

4WV

OF

Comp

N2
N1

L

!

Power
supply

208/230V

L2

L1

Outdoor coil sensor, 2 conductor cable, (26 feet long)
shipped with the indoor unit. Extend with 22 ga. low voltage
wire if not long enough to reach outdoor unit.

Indoor Unit
Terminal Block

Outdoor Unit
Terminal Block

Connecting Wires

NEC requires an approved
electrical disconnect within
sight of the unit so that
anyone working on the unit
can turn the power off and
see that its not accidentally
turned back on. This will
require two disconnects, one
by the outdoor unit and one
by the indoor unit

A

4WV

OF

COMP

L1
L2

L1
L2

Figure 17. Heat Pump Unit Size 20 & 25 Figure 16. Cooling Only Size 20 & 25

Wiring Diagrams

INDOOR UNIT
MODEL: M5WM 10F – 15F

OUTDOOR UNIT
MODEL: M5LC 10C – 15C

Page 13

IM-5WMF(SEER13)-0607

115V

208/230V

INDOOR UNIT

MODEL :M5WM 20F

OUTDOOR UNIT
MODEL: M5LC 20C – 25C

IM-5WMF(SEER13)-0706

Page 14

OUTDOOR UNIT
MODEL: M5LC 20C

INDOOR UNIT

MODEL: M5WM 25F

Page 15

IM-5WMF(SEER13)-0706

OUTDOOR UNIT:
MODEL: M5LC 25C

INDOOR UNIT

MODEL: M5WM 10FR – 15FR

OUTDOOR UNIT
MODEL:

M5LC 10CR – 15CR

IM-5WMF(SEER13)-0706

Page 16

INDOOR UNIT
MODEL: M5WM 20FR

IM-5WMF(SEER13)-0706 Page 17

OUTDOOR UNIT
MODEL: M5LC 20CR

INDOOR UNIT
MODEL: M5WM 25FR

IM-5WMF(SEER13)-0706

Page 18

OUTDOOR UNIT:
MODEL: M5LC 25CR

Vacuuming and Charging

Purging the Piping and the Indoor Unit

Except for the outdoor unit which is pre-charged with
refrigerant, the indoor unit and the refr igerant connection
pipes must be air-purged because the air containing
moisture that remains in the refrigerant cycle may cause
malfunction of the compressor.

• Remove the caps from the valve and the service port.

• Connect the center of the charging gauge to the

vacuum pump.

• Connect the charging gauge to the service port of the
3-way valve. (See Figure 18.)

• Start the vacuum pump. Evacuate for approximately 30
minutes. The evacuation time varies with different
vacuum pump capacity. Confirm that the charging
gauge needle has moved towards -760mmHg

(-29.9”Hg).

Caution:

• If the gauge needle does n ot move to -760mmHg, be
sure to check for gas leaks (using the refrigerant
detector) at flare type connection of the indoor and
outdoor unit and repair the leak before proceeding to
the next step.

• Close the valve of the charging gauge and stop the
vacuum pump.

• On the outdoor unit, open the suction valve (3 way) and
liquid valve (2 way) (in anti-clockwise direction) with
4mm key for hexagon sacked screw.

Figure18. 3-way Suction Valve on Outdoor Unit

Additional Charge

The refrigerant is pre-charged in the outdoor unit. If the
tubing length between the indoor and outdoor unit is no
more than 25ft. than an additional charge after
evacuation is not necessary. If the tubing length is more
than 25ft., use additional R410A as indicated in Table 5.

Table 5. Additional R410A ounces (when tubing length is

more than 25 feet

Model 26’ -33’ 34’ – 40’ 41’ – 50’

10F 1.2 2.0 ­15F 1.2 2.0 ­20F 1.2 2.0 3.5

25F 2.8 5.3 9.4
10FR 1.6 2.8 ­15FR 1.6 2.8 ­20FR 2.0 3.5 5.8
25FR 4.0 7.0 11.8

Charge Operation

This operation must be done by using a gas cylinder
and a precise weighing machine. The additional charge
is topped-up into the outdoor unit using the suction
valve via the service port. See Figure 20.

• Remove the service port cap.

• Connect the low pressure side of the charging gauge

to the suction service port center of the cylinder tank
and close the high pressure side of the gauge. Purge
the air from the service hose.

• Start the air conditioner unit.

• Open the gas cylinder and low pressure charging

valve.

• Whe n the required re frigerant quantity is pumpe d into
the unit, close the low pressure side and the gas
cylinder valve.

• Disconnect the service hose form service port.

Put

back the service port cap.

Figure 19. Vacuuming Schematic

Figure 20. Charging Schematic

Page 19

IM-5WMF(SEER13)-0706

Special Precautions When
Dealing With R410A Unit

R410A is a new HFC refrigerant which does not damage
the ozone layer. The working pressure of this new
refrigerant is 1.6 times higher than conventional
refrigerant (R22), thus proper installation/servicing is
essential.

• Never use refrigerant other than R410A in an air­conditioner which designed to operat e with R410A.

• POE oil is used as lubricant for R410A compressor,
which is different from the mineral oil used for R22
compressor. During installation or servicing, extra
precaution must be taken not to expose the R410A
system too long to moist air. Residual POE oil in the
piping and components can absorb moisture from the
air.

• To prevent mischarging, the diameter of the service
port on the flare valve is different from that of R22.

• Use tools and materials exclusively for refrigerant
R410A. Tools exclusively for R410A are manifold valve,
charging hose, pressure gauge, gas leak detector, flare
tools, torque wrench, vacuum pump and refrigerant
cylinder.

• As an R410A air conditioner incurs higher pressure
than R22 units, it is essential to choose the copper
pipes correctly. Never use copper pipes thinner than

0.8mm even though they are available in the market.

• If the refrigerant gas leakage occurs during
installation/servicing, be sure to ventilate fully. If the
refrigerant gas comes into contact with fire, a
poisonous gas may occur.

• When installing or removing an air conditioner, do not
allow air or moisture to remain in the refrigerant cycle.

Unit Indicator Lights

IR Signal Receiver

When an infrared remote control operating signal is
transmitted, the signal receiver on the indoor unit beeps to
confirm acceptance of the signal transmission.

Figure 21. Indicator Lights Location – Indoor Unit

Cooling Only Unit

Table 6 shows the LED indicator lights for the cooling only
unit under normal operation and fault conditions. The LED
indicator lights are located at the bottom right side of the
indoor unit. (See Figure 21 and Figure 22).

Figure 22. LED Indicator Lights for Cooling Only Unit

Table 6. LED Indicator Lights: Normal Operation and Fault

Conditions for Cooling Only Unit

Power

Sleep

Timer

Dry

Mode

or

Fault

Action

Timer -

Sleep -

Dry -

Once
every 2
sec.

Room air

sensor
contact
loose/short

Repair
or
replace

Twice
every 2
sec.

Indoor coil

sensor
contact
loose/short

Repair
or
replace

3 times
every 2
sec.

Sensor coil

problem,
compressor
overload
protection
trip or gas
leak.

Check
circuit
breaker,
check
for gas
leak

CAUTION

• R410A must be charged as liquid. Usually R410A

cylinder is equipped with a dip-pipe for liquid
withdrawal. If there is no dip-pipe, the cylinder
should be inverted so as to withdraw liquid R410A
from the valve.

• Do not top-up when servicing leak, as this will

reduce the unit performance. Vacuum the unit
thoroughly and then charge the unit with fresh
R410A according to the amount rec ommended in
the specification.

• Do not touch the compressor or refrigerant piping

when the chiller is running. If necessary wear
protective gloves.

ON / ON or OFF Blinking

Page 20

IM-5WMF(SEER13)-0706

Heat Pump Unit

Table 7 shows the LED indicator lights for the heat pump unit under normal operation and fault conditions. The LED
indicator lights are located at the bottom right side of
the indoor unit.

The heat pump units are equipped to maintain selected room temperature by switching automatically to either “cool” or
“heat” mode.

Figure 23. LED Indicator Lights: Normal Operation and

Fault Conditions for Heat Pump Unit

Table 7. LED Indicator Lights: Normal Operation and Fault Conditions for Heat Pump Unit

Cool

Dry

Fan

Heat

Sleep

Mode or Fault Action

/

Cooling -

Dry -

Fan -

/

Heat -

/

Auto mode in heating
operation. *

-

/

Auto mode in cooling
operation. *

-

Compressor cycling on

overload

Low outdoor air flow, defective
compressor or overload.

Indoor coil sensor loose
or defective

Attach or replace.

Outdoor coil sensor

loose or defective

Attach or replace.

Room air sensor loose

or defective

Attach or replace.

Unit Malfunctions If in AUTO or SLEEP mode, switch to

Heat, turn SLEEP off, unplug power
cord and plug back in.
If both lights blink with unit in Heat or
Cool and SLEEP off, the problem may
be coil sensor, compressor has tripped
or low refrigerant.

ON / ON or OFF Blinking

* Unit has 10 minutes delay before it will switch between modes.

IM-5WMF(SEER13)-0706

Page 21

Special Features

Dry Mode

• Select this mode when the standard Cool mode does
not provide sufficient dehumidification. The compressor
and indoor low fan will cycle together and will operate
for longer periods of time to provide the increa sed rate
of dehumidification. As a result, the room temperature
differential may increase slightly.

Heat Mode (Heat Pump Only)

• When the unit is switched on from cold start or
defrosting cycle, the indoor fan will start to operate only
after the indoor coil becomes warmer.

• When the set temperature is achieved, the indoor fan
will stop as the indoor coil starts to cool.

Air Flow Control

• For more effective air circulation, you can manually
adjust the air discharge grille to the left or right.

• During cool and dry mode operation, do not direct the
air discharge louver downwards as it may cause
condensate to drip. (See figure 24).

Hot Keep (For Heat Pump Only)

• With the Hot Keep switch OFF, the indoor fan will stop
when coil temperature drops to 86ºF. With the switch
ON, the fan will not stop unless coil temperature drops
below 65ºF. With the switch in INTERNAL, and the unit
is not heating, the fan is on for 30 seconds and off for 2
min. (See Figure 24).

• In cool mode, fan runs continuous at selected speed.

• The switch is located on front of the indoor unit, above

the ON/OFF switch (See Figure 24).

Figure 24

Overheating Protection (Heat Pump Only)

• If the indoor coil temperature exceeds 145ºF because
of high ambient conditions, dirty air filter, etc., the
compressor will turn off.

Frost Prevention

• If the indoor coil starts to frost in cooling mode, the
compressor will stop.

• If the outdoor coil becomes frosted, heating will stop for
a few minutes while the unit goes into defrost.

Fan Speed and Rated Cooling Capacity

• The rated cooling capacity is provided at the maximum
fan speed.

• The cooling capacity is slightly lower when the unit is
operating at MEDIUM and LOW fan speed.

Main Filters – Permanent and Washable

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 relative ly
clean operating or low usage conditions. Unit malfunction
will occur if air filters are not kept clean. Vacuum the
filters from the dirty side or wash with hot water and a
mild detergent. Allow the filters to dry thoroughly before
replacing them. See Figure 25.

Electrostatic Air Purifying Filter

Pre-charged electrostatic polypropylene filter removes
microscopic dust, smoke and small invisible particles to
keep the room air clean.

Deodorizing Filter

Activated carbon filter removes unwanted smells and
odors in the air and keeps the room air fresh.

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IM-5WMF(SEER13)-0706

Figure 25. Installing Filters

Filter Replacement

Replace the electrostatic air purifying and deodorizing
filters every 6 months or sooner if th ey turn brown.

Replacement filters can be purchased from your sales
representative or distributor.

Use the new filter immediately once it has been
removed from the package.

Auto Random Re-start Function

If there is a power loss to the building, the units will
randomly restart when the power is restored. Control
will restart at the last setting regardless of how long the
power was off.

Low Ambient Kit

With this option, the unit can cool down to 32ºF outdoor
temperature. (Standard units only cool down to 66ºF). To
install, wire the Fan Speed Control Module (FSCM) in the
outdoor unit per wiring diagram supplied with the kit. Attach
the Outdoor Coil Sensor to the return bend as shown in
Figure 26. Wrap sensor and return bend with insulating
tape to promote accurate sensing of the refrigerant
temperature. Refer also to the instructions supplied with the
kit.

Figure 26 Low Ambient Location

Minimum and Maximu m Operating
Temperature

Cooling

Temperature Ts ºF Th ºF

Minimum Indoor 67 57
Maximum Indoor 80 67
Minimum Outdoor *66 57
Maximum Outdoor 115 75

Heating (Heat Pump Only)

Temperature Ts ºF Th ºF

Minimum Indoor 50 ­Maximum Indoor 80 ­Minimum Outdoor 16 16
Maximum Outdoor 75 65

Ts = Dry Bulb Temperature, Th = Wet Bulb Temperature

* 32ºF with optional Low Ambient Kit

WARNING

!

Disconnect the main power supply before opening
the return air grille.
DO NOT restore power until the grille is closed.

IM-5WMF(SEER13)-0706

Page 23

Remote Controller Operation Guide

1) Transmission Source

• The source where the sign al is transm itted.

2) Signal Transmission Indication

• Blinks to confirm the last setting has been transmitted to
the unit.

3) “ON/OFF” Button

• Press once to start the unit.

• Press again to stop the unit.

4) Temperature Setting

• To set the desired room temperature, press the + or –
button to increase or decrease the set temperature.

• The temperature setting range is from 60ºF to 86ºF
(Optional setting 68ºF to 86ºF).

• Press both bu ttons simultaneously to toggle + and – from
ºC to ºF setting.

5) Operation Mode

• Press the MODE button to select the type of operating
mode.

• For cooling only unit, the available modes are: COOL,
DRY and FAN.

• For heat pump unit, the available modes are: AUTO,
COOL, DRY, FAN and HEAT.

6) Fan Speed Selection

• Press the

button continuously to toggle the fan speed
in the following order:
Low Med High Auto

• Stop pressing when the desired fan speed appears on
the display screen.

7) Turbo Function

• Press

for fast cooling or heating operation.

• The temperature will be increased internally if it is in HEAT mode, decreased if in COOL and DRY mode.

• Fan speed will be increased if it is not at maximum speed.

• The temperature and fan speed will resume to user setting if

is pressed again or after 20 minutes.

• Available under HEAT, COOL and DRY modes only .

8) ON Timer Setting

• Press the SET button will activate the on timer function.

• Set the desired on time by pressing the SET button continuously. If the timer is set to 7.30am, the air

conditioner will turn on at 7.30am sharp.

• Press the CLR button to cancel the on timer setting.

9) OFF Timer Setting

• Press the SET button w ill activate the off timer function.

• Set the desired of time by pressing the SET button continuously.

• Press the CLR button to cancel the off timer setting.

10) Automatic Air Swing (optional)

• Press the SWING button to activate the auto matic air swing function.

• To distribute the air to a specific direction, press the SWING button and wait until the louver move to the

desired direction and press the button once again.

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IM-5WMF(SEER13)-0706

11) Sleep Mode Setting

• Press the SLEEP button will activate the sleep mode function.

• This is an energy saving option. When the unit is operating under cooling mode, the set temperature is increased

by 0.5ºC after the first half an hour, another 0.5ºC after the second half an hour and 1ºC after the following 1 hour.
This function will prevent excessive cooling during summer season.

• When the unit is operating under heating mode, the set temperature is decreased by 1ºC after the first half an
hour, another 1ºC after the second half an hour and 1ºC after the following 1 hour. This function will prevent night
sweat during summer season.

• This function is available under COOL, HEAT and AUTO mode.

Figure 27 Sleep Mode Setting

12) Clock Time Setting

• Press + button to increase the clock time.

• Press – button to decrease the clock time.

13) Personalize Setting

• Press and hold for 3 seconds, then will blink. Press again to cycle between and .

P1 P1 P2

• Set the desired setting, then leave the handset for 4 seconds without pressing any key and it will save the setting
into the program.

• Press once to activate the P1 setting, press again to cycle between P1 and P2.

• Press any key to deactivate the personalize setting.

14) Ionizer Setting (optional)

• Press will activate the ionizer function.

• Press again to deactivate the function.

Symbol Identification

IM-5WMF(SEER13)-0706

Page 25

Service and Maintenance

Maintenance Schedule

Item Maintenance Procedures Frequency
Indoor Air
Filters

Lift the return air grille and
remove the filters (See
Figure 23). Clean the filters
by using a vacuum cleaner
or wash in lukewarm water
and soap. Rinse and dry
before reinstalling.

As required to
prevent restriction
of air flow.

Indoor
Cabinet

Remove any dust on the
grille or panel by wiping it
with a soft cloth soaked in
lukewarm water (below
40ºC / 104ºF) and a mild
detergent.

As required to
maintain
appearance.

Outdoor
Unit

Clean the louvers and coil.
Be careful not to bend or
flatten the aluminium fins.
DO NOT use cleaning
fluids that might corrode
the coil.

As required to
prevent restriction
of air flow.

Troubleshooting

If any malfunction of the unit is noted, immediately switch
off the power supply.

Check the following chart for possible causes/treatments.
If the trouble persists, please call your local

dealer/serviceman.

Trouble Possible Cause/Treatment

The compressor
does not operate.

Protection against frequent
starting. Wait for 3 to 4 minutes
for the compressor to start

operating.
Fans and
compressor do not
operate.

Power failure.

Check fuse or circuit breaker.

Power supply disconnect off.

Delay timer may be set

incorrectly. Adjust timer setting

by using remote controller.
Air flow too low or
insufficient
cooling/heating
capacity.

Dirty air filters.

Open doors or window.

Adjust thermostat setting.
Discharge air flow
has bad odor.

Smoke, perfume, etc. may

have collected on the indoor

coil.

Clean coil.
Condensation on the
return air grille of the
indoor unit.

Use dry mode. High humidity in

conditioned space.

Set temperature too low.

Increase temperature setting

and operate unit at high fan

speed.
Condensate leaking
into room.

Condensate drain plugged.
Hissing sound from

the unit during
operation.

Refrigerant fluid flowing into the

evaporator coil. Operate for a

while to see if sound goes

away.

CAUTION

Disconnect the electrical power supply before
performing any service, maintenance or
troubleshooting.

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IM-5WMF(SEER13)-0706

This document contains the most current product information as of this printing. The manufacturer reserves the right to
revise any of the specification and design contain herein at any time without prior notification.