McQuay IM818 Manual

IM 818 Page 1
MCK Ceiling Cassette Ductless Split Type Air Conditioner
Installation and Maintenance Manual IM818
Group: Unitary
Part Number: IM818
Date: March 2005
© 2005 McQuay International
Indoor Unit Wireless Remote
Control (Standard)
Outdoor Unit Wired Wall
Control (Optional)

Page 2 IM 818
Table of Contents
Model Numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Cooling Only . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Cooling/Heat Pump . . . . . . . . . . . . . . . . . . . . . . . . . . 2
General Information . . . . . . . . . . . . . . . . . . . . . . . . . 3
Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Unit Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Indoor Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Outdoor Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Installation Guidelines . . . . . . . . . . . . . . . . . . . . . . . 5
Installation Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Installation of Outdoor Unit . . . . . . . . . . . . . . . . . . . . . 5
Installation of the Indoor Unit. . . . . . . . . . . . . . . . . . . . 5
Drain Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Drain Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Condensate Pump. . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Water Level Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Front Panel Installation . . . . . . . . . . . . . . . . . . . . . . . . 6
Air Intake Grille Installation . . . . . . . . . . . . . . . . . . . . . 7
Refrigerant Tubing . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Tubing Length & Elevation . . . . . . . . . . . . . . . . . . . . . 8
Tubing Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Tubing Connection To Units . . . . . . . . . . . . . . . . . . . . 8
Electrical Connections . . . . . . . . . . . . . . . . . . . . . . . 9
Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Evacuating and Charging. . . . . . . . . . . . . . . . . . . . 17
Evacuating the tubing and the indoor unit. . . . . . . . . 17
Additional charge . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Charge operation . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Remote Controller Operation Guide . . . . . . . . . . . 18
Wired Wall Control (Optional) . . . . . . . . . . . . . . . . 19
Special Features . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Dry mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Heat mode (heat pump only) . . . . . . . . . . . . . . . . . . 20
Overheating protection (heat pump only) . . . . . . . . . 20
Frost prevention . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Fan speed and rated cooling capacity . . . . . . . . . . . 20
Operating Conditions . . . . . . . . . . . . . . . . . . . . . . 20
Cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Overall Checking . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Unit Indicator Lights . . . . . . . . . . . . . . . . . . . . . . . . 21
IR signal receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Wireless Remote Control . . . . . . . . . . . . . . . . . . . . . 21
Mode and Diagnostic Chart . . . . . . . . . . . . . . . . . . . 21
Startup After Extended Shutdown . . . . . . . . . . . . 22
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Service and Maintenance . . . . . . . . . . . . . . . . . . . 23
Model Numbers
Cooling Only
Cooling/Heat Pump
Indoor Unit Outdoor Unit Nominal Cooling - BTUH
MCK20A MLC20B 21,000
MCK25A MLC25B 25,000
MCK30A MLC30C 30,000
MCK40A MLC40C 40,000
MCK50A MLC50C 50,000
Indoor Unit Outdoor Unit Nominal Cooling - BTUH Nominal Heating - BTUH
MCK20AR MLC20BR 20,000 20,000
MCK25AR MLC25BR 25,000 25,000
MCK30AR MLC30CR 30,000 31,000
MCK40AR MLC40CR 40,000 41,000
MCK50AR MLC50CR 48,000 50,000

IM 818 Page 3
General Information
This manual provides the installation procedures so
your air conditioner unit operates properly and pro-
vides 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 fol-
lowing safety precautions carefully.
.
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 cause property damage, equipment damage, severe
personal injury or death. This equipment must be
installed by experienced, trained personnel only.
• Do not allow flammable fumes near unit or areas shar-
ing ventilation.
• Installation and maintenance must be performed by
qualified persons who are familiar with local code and
regulation, 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, sever 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
injury or death.
CAUTION
Use copper conductors only. Unit terminals are not
designed to accept other types of conductors. Failure to
do so can cause damage to the equipment.
CAUTION
• Do not 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 around the
unit, it can cause a fire.
• Connect drainage piping properly. If drainage piping is
not connected properly, water leakage can cause prop-
erty damage.
• Do not overcharge the unit. This unit is factory pre-
charged. 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 follows:
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 result in the
carrie’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 for
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.

Page 4 IM 818
Unit Dimensions
Indoor Unit
Model: MCK20, 25, 30, 40, 50 A/AR
Outdoor Unit
Model: MLC20 & 25B/BR, MLC30, 40 & 50C/CR
Note: See Figure 3
For More Detail
32 1/4”
32 1/4”
14 3/4”
13 3/4”
36 5/8”
36 5/8”
Front Panel
Frame
Frame and
Front Panel
Model MLC 20 & 25 B/BR 30, 40 & 50C/CR
A16" 19 1/4"
B33" 40 1/2"
C25 1/2" 33 1/2"
D2 1/4" 3 1/2"
E 13 1/4" 15 3/4"
F23 1/4" 29 3/8"
G4 7/8" 5 1/2"
H5/8" 3/4"
J3/4" 1"
K2" 2"
E
D
B
F
A
C
G
J
H
K
Electrical Access
Panel w/ 7/8” Knockout
Refrigerant
Piping Connections

IM 818 Page 5
Installation Guidelines
Installation Diagram
Installation of Outdoor Unit
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 instal-
lation clearances. Double the dimensions shown if surround-
ings are more than 72" tall, or if there is an obstruction on
top. Select the coolest possible place where intake air tem-
perature is not greater than the outside air temperature (maxi-
mum 113°F).
Figure 1. Outdoor Unit Minimum Clearances
Installation of the Indoor Unit
Electrical wiring and installation must conform to all national
and local codes.
Voltage supply fluctuation must not exceed 10% of rated
voltage.
Ensure that the location is convenient for wiring, piping and
drainage.
The indoor unit must be installed near the center of the room
with no obstacles in path of the discharge or return air. See
Figure 2 for minimum clearances.
The suspending structure must be stronge enough to avoid
amplifying noise and vibration.
The height above the finished ceiling must be 13 3/4" mini-
mum (See Figure 4).
Avoid excessive heat. Do not install close to steam or hot
water pipes.
Figure 2. Indoor Unit Minimum Clearances
Locate and install four (4) 3/8" threaded hanging rods per
dimensions shown in Figure 3. Each rod must be able to sup-
port 50 lbs. minumum.
The dimensions of the cardboard template match Figure 3.
Figure 3. Looking Up at Unit in Ceiling
Air Intake
Air Discharge Nozzle
Air Intake
OUTDOOR UNIT
INDOOR UNIT
Wireless IR
Remote Control
F
ront Panel
A
ir Filter
(
Behind the grille)
Air Discharge Louver (4)
3/4" OD Drain Connection
IR Receiver and
LED Indicator Lights
Air Intake Grille
Refrigerant Tubing
and Insulation
Frame
Line Voltage
Wiring
"L"
Optional Wired
Wall Control
12" 40"
12" 20"
Intake Air
Discharge Air
Service Access
Intake Air
Obstacle
Obstacle
Obstacle
Obstacle
Obstacle
40" Min.
120" Max.
20" Min.
Floor
Front Panel
24 1/2" (Hanging Rods)
35" (Ceiling Opening)
5 1/4"
31" (Hanging Rods)
35" (Ceiling Opening)
5 1/4"
5 1/4" 5 1/4"
24 1/2" (Hanging Rods)
31" (Hanging Rods)
32 1/4" (Unit Size)
32 1/4" (Unit Size)
2"
2"
2
"
2"

Page 6 IM 818
Hang the unit on the rods using washers and locknuts.
Adjust the unit height to 1" above the finished ceiling surface
and level in all directions (See Figure 4).
Figure 4. Unit Hanging
Drain Piping
Drain pipe must be pitched away from the unit for good
drainage (See Figure 5).
The outside diameter of the drain connection is 3/4". Use
flexable coupling with 3/4" ID (See Figure 6) .
Insulate drain pipe to prevent sweating.
Figure 5. Drain Piping
Drain Test
Connect the flexible coupling to the drain pipe.
Bend coupling upward and pour water in to check the piping
for leakage (See Figure 6).
When the test is completed, connect the flexible coupling to
the drain connection on the indoor unit.
Figure 6. Drain Test
Condensate Pump
The condensate pump will be on whenever compressor is on.
The pump will remain on for at least 5 minutes after the com-
pressor stops. Max head is 27" H2O.
Water Level Switch
This normally closed switch will open and turn off the com-
pressor if the condensate level gets to high.
If it closes within 5 minutes, the compressor will turn back
on. If the switch does not close for more than 5 minutes, the
system will warn user regarding the fault and the compressor
is not allowed to cut in. If the switch is confirmed opened
twice within 30 minutes, the compressor will stay off and
indicator lights will show fault (See Mode and Diagnostic
Chart, page 21).
Front Panel Installation
Open the air intake grille by pulling back the latches and
remove it together with the filter from the panel (See Figure
7).
Attach the front panel to the indoor unit with 4 screws. Make
sure the seals contact the indoor unit to prevent air leakage
(See Figure 9).
Figure 7. Front Panel Installation
1
0 1/2"8" 6 1/2"
1" Finished Ceiling Surface
1 1/2" Drain Line
Liquid Line
Gas Line 13 3/4"
Indoor Unit
Pipe Clamp
GOOD BAD
Pour Water In Here
F
lexible
C
oupling
Drain Pipe
OPEN
SCREW

IM 818 Page 7
Plug the 2 electrical cords from the front panel into the 2
matching connections inside the control box (See Figure 8).
Figure 8. Electrical Connection Front Panel to Control
Box
Figure 9. Prevent Discharge Air Leakage
Air Intake Grille Replacement
Reattach the air intake grille and filter to the front panel. The
grille can swing in 4 directions. Position the grille to maxi-
mize accessibility when open (See Figure 7).
F
rom
F
ront
P
anel
LED Connectors Control Box
Air Swing
Connectors
C o o l
A i r
C o o l
A i r
A i r L e a k
A i r L e a k
C e i l i n g B o a r d
C e i l i n g B o a r d
Panel
P a n e l
I n d o o r U n i t
B A D I N S T A L L A T I O N
G O O D I N S T A L L A T I O N
I n d o o r U n i t

Page 8 IM 818
Refrigerant Tubing
Tubing Length & Elevation
Copper tubing to connect the indoor and outdoor units is sup-
plied by others or it can be ordered from the factory. See
Table 1 for requirements.
Table 1: Refrigeration Tubing Requirements
Note: The refrigerant pre-charged in the outdoor unit is for tubing length "L" up
to 25 ft. See "Installation Diagram" page 5. See Table 6 on page 17 for addi-
tional R-22 refrigerant required on longer runs.
Tubing Preparation
• Do not use contaminated or damaged copper tubing. Do
not remove plastic, rubber plugs or 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 10).
• Remove burrs from cut ends by holding tubing down-
wards to prevent metal chips from entering the tubing.
• Slide flare nut on tubing.
• Flare the tubing as shown in Figure 10, Figure 11 and
Table 2.
• The flare must be even and not cracked or scratched.
Figure 10. Cutting and Flaring Tube
Table 2: Tube Flaring Dimensions
Tubing Connection To Units
• Connect the copper tubing to both the indoor and outdoor
units (See Figure 11).
• Torque each flare nut to specifications (See Table 3).
• Cover both tubes individually with 3/8" minimum wall
thickness foam insulation.
Table 3: Flare Nut Torque Specifications
Figure 11: Flare Tubing Connection
Model Indoor MCK20A MCK25A MCK30A MCK40A MCK50A
Model Outdoor MLC20B MLC25B MLC30C MLC40C MLC50C
Max. Length, "L"- Ft. 49’ 49’ 115’ 115’ 115’
Max. elevation-Ft. 26’ 26’ 49’ 49’ 49’
Max. no. of bends 10 10 10 10 10
Liq. tube size - OD 1/4" 3/8" 3/8" 3/8" 3/8"
Gas tube size - OD 5/8" 5/8" 5/8" 3/4" 3/4"
Cutrting Copper Tube
1/4 Tube
Copper Tube
Flaring Tool
See Table 2
X
Tube Diameter - OD X (in.)
Inch Imperial Rigid
1/4 .051 .028
3/8 .063 .039
5/8 .087 .067
Tube Size (in.) Torque (ft./lb.)
1/4 13.3
3/8 31.0
5/8 48.0
Flared Tube
Flare Nut
Unit Fitting

IM 818 Page 9
Electrical Connections
• Wiring must be in accordance with all applicable electri-
cal 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.
Note: Field install 10A fuse in blue wire of outdoor unit as
shown in wire diagrams for unit sizes 30, 40, and 50.
• See Table 4 and 5 for the number of wires, wire gage and
fuse/circuit breaker size required.
• NEC requires an approved electrical disconnect within
sight of the unit so that anyone working on the unit can
turn off the power and see that its not accidently turned
back on. This will require two disconnects, one by the
outdoor unit and one by the indoor unit.
Table 4: Wire, Fuse/Breaker Requirements - Cooling
Only
Table 5: Wire, Fuse/Breaker Requirements - Heat
Pump Only
* Not including the low voltage OD coil sensor cable.
WARNING
Improper installation can cause severe personal injury
or death. Wiring must be done by a qualified
technician in compliance with local codes.
Unit Size 20 25 30 40 50
Voltage - 60Hz. 1 Ph. 208/230
Power supply wire size 12 ga. 10 ga. 8 ga. 8 ga. 6 ga.
No. of 12 ga. wires
between units 2 + gnd. 2 + gnd 3 + gnd 3 + gnd 3 + gnd
Fuse/Breaker size 20 amp. 25 amp. 35 amp. 40 amp. 55 amp.
Unit Size 20 25 30 40 50
Voltage - 60Hz. 1 Ph. 208/230
Power supply wire size 12 ga. 10 ga. 8 ga. 8 ga. 6 ga.
No. of 12 ga. wires
between units* 5 + gnd. 5 + gnd 6 + gnd 6 + gnd 6 + gnd
Fuse/Breaker size 20 amp. 25 amp. 35 amp. 40 amp. 55 amp.

Page 10 IM 818
Wiring Diagrams
RETURN AIR SENSOR
INDOOR COIL SENSOR
ROOM
ID
OD
WIRED
REMOTE
CONTROLLER
WIRELESS
REMOTE
CONTROLLER
CN4 CN6
JH RMODE
CN3
TRANSFORMER
WATERLEVELSWITCH
L
COMP.
N1
N2
LIVE
4WV
DDH
WTP
AS LOWMED
HIGH
RED
RED BLACK
AS
BLUE BLUE
BLACK
PURPLE
ORANGE
BROWN
FH
FM
FL
WHITE
RED
A.C. I.C.
MC
FAN MOTOR
GREEN/YELLOW GREEN/YELLOW
COMP. N/L2
NOTE: DISCONNECT CN6
IF CN4 IS USED
KEY:
---- - FIELD SUPPLY WIRING
AS - AIRSWING MOTOR
DP - DRAIN PUMP (CONDENSATE)
COMP.
WHITE
FAN
MOTOR BROWN
C
CM BLUE
DP
MODEL MCK 020/025A INDOOR UNIT- (COOLING ONLY)
MODEL MLC / M4L020/025B OUTDOOR UNIT
N
S
R
RED
TO OUTDOOR
DEFROST SENSOR
L/L1 N/L2
PURPLE
BLACK
BLACK
RED
G/Y
L1
L2}208/230V
60Hz
RED
BLUE BLUE
BLUE
GREEN/YELLOW
CAPACITOR
KEY:
---- - FIELD SUPPLY WIRING
CM - COMPRESSOR MOTOR WITH
INTERNAL OVERLOAD PROTECTOR
12 GA. WIRE

IM 818 Page 11
RETURN AIR SENSOR
INDOOR COIL SENSOR
ROOM
ID
OD
WIRED
WALL
CONTROLLER
WIRELESS
REMOTE
CONTROLLER
CN4 CN6
JH RMODE
CN3
TRANSFORMER
L
COMP.
N1
N2
LIVE
4WV
DDH
WTP
AS LOWMED
HIGH
PURPLE
RED
RED
RED BLACK
AS
BLUE BLUE
BLACK
PURPLE
ORANGE
BROWN
FH
FM
FL
WHITE
RED
A.C. I.C.
MC
FAN MOTOR
GREEN/YELLOW GREEN/YELLOW
COMP.L/L1 N/L2
NOTE: DISCONNECT CN6
IF CN4 IS USED
KEY:
---- - FIELD SUPPLY WIRING
AS - AIRSWING MOTOR
DP - DRAIN PUMP (CONDENSATE)
2
08-230V
1 PH
L2
L1
10A
REDRED
BLUE
REDRED
RED
R/L1S/L2 T/L3
U/T1V/T2 W/T3 A2
A1
BLACK
RED
BLUE
WHITE
COMP. LN
GREEN/YELLOW
RED
BLUE
WHITE RED G/Y
FAN
MOTOR
BROWN
BROWN
C
RS
COMPRESSOR CRANKCASE
HEATER
{
*NOTE: FIELD INSTALL 10A FUSE
IN BLUE WIRE AS SHOWN
DP
MODEL MCK 030A INDOOR UNIT- (COOLING ONLY)
MODEL MLC / M4L030C OUTDOOR UNIT
SRLN
BLUE
*10A
RED
G/Y
HIGH / LOW
PRESSURE SWITCH
RED RED
RED
BLUE BLUE
MAGNETIC
CONTACTOR
SR
RED
RED
RED
1
2
AC
TO OUTDOOR
DEFROST SENSOR
WATERLEVELSWITCH
12 GA. WIRE

Page 12 IM 818
RETURN AIR SENSOR
INDOOR COIL SENSOR
ROOM
ID
OD
WIRED
WALL
CONTROLLER
WIRELESS
REMOTE
CONTROLLER
CN4 CN6
JH RMODE
CN3
TRANSFORMER
L
COMP.
N1
N2
LIVE
4WV
DDH
WTP
AS LOWMED
HIGH
PURPLE
RED
RED
RED BLACK
AS
BLUE BLUE
BLACK
WHITE
BLUE
YELLOW
FH
FM
FL
WHITE
RED
A.C. I.C.
MC
FAN MOTOR
GREEN/YELLOW GREEN/YELLOW
COMP.L/L1 N/L2
NOTE: DISCONNECT CN6
IF CN4 IS USED
KEY:
---- - FIELD SUPPLY WIRING
AS - AIRSWING MOTOR
DP - DRAIN PUMP (CONDENSATE)
2
08-230V
1 PH
60Hz L2
L1
10A
RED
RED
REDRED RED
RED
RED
RED
RED RED
RED
1L1 3L2 5L3
2T1 4T2 6T3
1
2A2
A1
BLUE BLACK
BLUE BLUE
RED
BLACK
BLACK
BLUE
BLUEGREEN/YELLOW
PURPLE
PURPLE
WHITE
COMP. L/L1 N/L2
GREEN/YELLOW
RED
BLUE
WHITE RED
G/Y
FAN
MOTOR
BROWN
BROWN
C
RS
COMPRESSOR
BLUE
CRANKCASE
HEATER
LOW
PRESSURE
SWITCH
HIGH
PRESSURE
SWITCH
LOCK OUT
RELAY
{
2
*10A
*NOTE: FIELD INSTALL 10A FUSE
IN BLUE WIRE AS SHOWN
DP
MODEL MCK 40A/50A - (COOLING ONLY)
MODEL MLC 40C/50C
L/L1 N/L2
WATERLEVELSWITCH
12 GA. WIRE
BLACK

IM 818 Page 13
RETURN AIR SENSOR
INDOOR COIL SENSOR
ROOM
ID
OD
WIRED
WALL
CONTROLLER
WIRELESS
REMOTE
CONTROLLER
CN4 CN6
JH RMODE
CN3
TRANSFORMER
L
COMP.
N1
N2
LIVE
4WV
DDH
WTP
AS LOWMED
HIGH
RED
RED BLACK
AS
BLUE BLUE
BLACK
PURPLE
ORANGE
BROWN
FH
FM
FL
WHITE
RED
A.C. I.C.
MC
FAN MOTOR
GREEN/YELLOW GREEN/YELLOW
COMP. N/L2
NOTE: DISCONNECT CN6
IF CN4 IS USED
KEY:
---- - FIELD SUPPLY WIRING
AS - AIRSWING MOTOR
DP - DRAIN PUMP (CONDENSATE)
WHITE
FAN
MOTOR
CM
DP
M
ODEL MCK 020/025AR INDOOR UNIT- (HEAT PUMP)
MODEL MLC / M4L020/025BR OUTDOOR UNIT (HEAT PUMP)
L/L1 N/L2
PURPLE
BLACK
BLACK
RED
G/Y
GREEN/YELLOW
KEY:
---- - FIELD SUPPLY WIRING
CM -COMPRESSOR MOTOR
4V - 4 WAY VALVE
TH2 - OUTDOOR THERMISTOR
OF
4WV
BLUE
BROWN
COMP. N
OF4WV
BLUE
BLUE
BLACK
GREEN/YELLOW
RED
RED
WHITE
BLACK 4V
BLACK
BLACK
BROWN
BROWN
BLACK
BLUE
BLUE
CR
S
TH2
LOW VOLTAGE CABLE TO
OUTDOOR COIL SENSOR
L2
L1
12 GA. WIRE
WATERLEVELSWITCH

Page 14 IM 818
RETURN AIR SENSOR
INDOOR COIL SENSOR
ROOM
ID
OD
WIRED
WALL
CONTROLLER
WIRELESS
REMOTE
CONTROLLER
CN4 CN6
JH RMODE
CN3
TRANSFORMER
L
COMP.
N1
N2
LIVE
4WV
DDH
WTP
AS LOWMED
HIGH
PURPLE
RED
RED
RED BLACK
AS
BLUE BLUE
PURPLE
ORANGE
BROWN
FH
FM
FL
WHITE
RED
A.C. I.C.
MC
FAN MOTOR
GREEN/YELLOW
NOTE: DISCONNECT CN6
IF CN4 IS USED
KEY:
---- - FIELD SUPPLY WIRING
AS - AIRSWING MOTOR
DP - DRAIN PUMP (CONDENSATE)
2
08-230V
1 PH
60Hz L2
L1
10A
REDRED
RED RED
21 L2 L3
22 T2 T3 A2
A1
BLUE
WHITE
COMP. LN
RED
BLUE
C
RS
COMPRESSOR
{
*NOTE: FIELD INSTALL 10A FUSE
IN BLUE WIRE AS SHOWN
DP
MODEL MCK 030AR INDOOR UNIT- (HEAT PUMP)
MODEL MLC / M4LC030CR OUTDOOR UNIT (HEAT PUMP)
A4WV
LN
BLUE *10A
RED
G/Y
HIGH
PRESSURE
SWITCH
RED
RED
TO OUTDOOR
DEFROST SENSOR
OF
GREEN/YELLOW
COMP. N/L2
L/L1 N/L2
BLACK
OF4WV
G/Y
A
BLUE
BLACK
BROWN
BLACK
L1
T1
13
14
BLUE
WHITE
WHITE
CRANKCASE
HEATER
GREEN/YELLOW
WHITE
BLUE
BLUE
BROWN BROWN
FAN
MOTOR
WHITE
BLACK
BLUE BLACK
RED
O/D COIL SENSOR
4WV
BLACK BLACK
LOW VOLTAGE CABLE TO
OUTDOOR COIL SENSOR
WATERLEVELSWITCH
12 GA. WIRE

IM 818 Page 15
RETURN AIR SENSOR
INDOOR COIL SENSOR
ROOM
ID
OD
WIRED
WALL
CONTROLLER
WIRELESS
REMOTE
CONTROLLER
CN4 CN6
JH RMODE
CN3
TRANSFORMER
L
COMP.
N1
N2
LIVE
4WV
DDH
WTP
AS LOWMED
HIGH
PURPLE
RED
RED
RED BLACK
AS
BLUE BLUE
WHITE
BLUE
YELLOW
FH
FM
FL
WHITE
RED
A.C. I.C.
MC
FAN MOTOR
GREEN/YELLOW
NOTE: DISCONNECT CN6
IF CN4 IS USED
KEY:
---- - FIELD SUPPLY WIRING
AS - AIR SWING MOTOR
DP - DRAIN PUMP (CONDENSATE)
2
08-230V
1 PH
60Hz L2
10A
RED
1L1 5L3 1
2T1 6T3 2A2
A1
BLUE
COMP. LN
RED
BLUE
C
RS
COMPRESSOR
{
*NOTE: FIELD INSTALL 10A FUSE
IN BLUE WIRE AS SHOWN
DP
MODEL MCK 040AR/50AR INDOOR UNIT (HEAT PUMP)
MODEL MLC040CR/50CR
A4WV
LN
BLUE *10A
RED
G/Y
HIGH
PRESSURE
SWITCH
RED
RED
TO OUTDOOR
DEFROST SENSOR
OF
GREEN/YELLOW
COMP. L1 L2
OF4WV
A
BLUE
BLACK
BROWN
BLACK
3L2
4T2
BLUE
WHITE
WHITE
CRANKCASE
HEATER
GREEN/YELLOW
WHITE
BLUE
BLUE
BROWN BROWN
FAN
MOTOR
WHITE
BLACK
BLUE BLACK
RED
O/D COIL SENSOR
4WV
BLACK BLACK
LOW VOLTAGE CABLE TO
OUTDOOR COIL SENSOR
WATERLEVELSWITCH
12 GA. WIRE
LN
L1 L2
L1
RED
WHITE
RED
RED

Page 16 IM 818
CM
FM
C
S
R
CAPACITOR
CAPACITOR
WHITE
RED
BLUE
BLUE
BLUE
COMP N
GREEN/YELLOW
KEY
CM - COMPRESSOR MOTOR
FM - OUTDOOR FAN MOTOR
FSCM - FAN SPEED CONTROL MODULE
12 GA. WIRE BY OTHERS
YELLOW
ORANGE
1 2 3 4 5
FSCM
OUTDOOR COIL SENSOR
(TO INDOOR UNIT)
MODEL : MLC 20B - 25B OUTDOOR UNIT - COOLING ONLY -
O
PTIONAL LOW AMBIENT KIT
OL
M
ODEL : MLC20BR - 25BR OUTDOOR UNIT - HEAT PUMP -
O
PTIONAL LOW AMBIENT KIT
FM CM
4 3 2 1
FSCM
COMP. N
OF4V
(TO INDOOR UNIT)
RED
BLACK
TH2
BLACK
4V
BLACK BLACK
ORANGE
BLACK
YELLOW
BROWN
BROWN
BROWN
BLUE
BLACK
WHITE
BLUE
BLUE
WHITE
BLACK
GREEN/YEL
RED
BLUE
C
S
R
KEY
FM - FAN MOTOR
CM - COMPRESSOR MOTOR
4V - 4 WAY VALVE
TH2 - OUTDOOR THERMISTOR
FSCM - FAN SPEED CONTROL MODULE
E
E
WHITE
BLUE
RED
BROWN
BLUE
BLUE
12 GA. WIRE BY OTHERS
BLUE

IM 818 Page 17
Evacuating and Charging
Evacuating the tubing and the indoor unit
The outdoor unit is pre-charged with refrigerant R-22. The
indoor unit and the refrigerant connection tubing must be
evacuated as follows:
1. Remove the 3 caps from the valves on the outdoor unit.
2. Connect the center of the charging gauge to the vacuum
pump.
3. Connect the charging gauge to the service port of the
3-way valve (See Figure 13).
4. Start the pump and evacuate to -760 mm Hg (-29.9" Hg).
5. Close the valve of the changing gauge and stop the vac-
uum pump.
6. On the outdoor unit, open both valves using a 4 mm
Allen wrench. (See Figure 12.)
Figure 12. 3-way Suction Valve on Outdoor Unit
Figure 13 Evacuation Schematic
Additional charge
The refrigerant is pre-charged in the outdoor unit. If the tub-
ing length ("L") between the indoor and outdoor unit is no
more than 25 ft., additional charge after evacuation is not
necessary. If the tubing length ("L") is more than 25 ft., use
additional R-22 as indicated in Table 6. (See Installation Dia-
gram on page 5).
Table 6: Additional R-22 ounces per ft. (when tubing
length "L" is more than 25 feet - see Installation
Diagram on page 5)
Charge operation
This operation must be done by weighing the R-22 being
added thru the service port on the 3 way suction valve. (See
Table 6 and Figure 14.)
1. Remove the service port cap.
2. 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 (See Figure 14).
3. Start the air conditioner unit.
4. Open the gas cylinder and low pressure charging valve.
5. When the required refrigerant quantity is pumped into
the unit, close the low pressure side and the gas cylinder
valve.
6. Disconnect the service hose from service port. Put back
the service port cap.
Figure 14. Charging Schematic
Hex Socket
for 4 mm
A
llen wrench Flare Nut
Refrigerant
Tubing
Service
Port Outdoor Unit
3-wa
y
Valve
Indoor Unit
Liquid side
Outdoor Unit
Close
Discharge Valve
Suction Valve
Close
Gas side
Vacuum
Pump
High
Press
.
Low
Press.
Model Oz. Per Ft. Max. Length "L"-Ft.
20A .16 49’
25A .40 49’
30A .53 115’
40A .55 115’
50A .55 115’
20AR .16 49’
25AR .50 49’
30AR .53 115’
40AR .55 115’
50AR .55 115’
Indoor Unit
O
utdoor Unit
Liquid side
Gas side
High
Press
.
Low
Press
.
Discharge Valve
Suction Valve

Page 18 IM 818
Remote Controller Operation Guide
Transmission source
• The source where the signal is
transmitted.
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 con-
ditioner will turn on at 7.30 sharp.
• Press the CLR button to cancel the
on timer setting.
Fan Speed Selection
• Press the button until the desired
fan option displays (auto, low,
med. or high). "Auto" automatically
selects high fan until room temper-
ature is within 2oF of setting, then
switches to low speed. Fan runs
continuous in Cool and cycles in
Heat.
Signal Transmission Indication
• Blinks to confirm the last setting
was sent to the unit.
On/Off Button
• Press once to start the air
conditioner.
• Press again to stop the air
conditioner.
Operation mode
• Press the MODE button to select
the type of operating mode.
• For cooling only unit, the available
modes are : COOL, DRY & FAN.
• For heat pump unit, the available
modes are: AUTO, COOL, DRY,
FAN & HEAT.
Temperature Setting
• Set the desired room temperature
by pressing the buttons to increase
or decrease the set temperature.
• The temperature setting range is
from 60°F to 86°F.
• Press both buttons simultaneously
to toggle the temperature setting
between °C and °F.
Automatic Air Swing
• Press the SWING button to
activate the automatic air swing
function.
• To distribute the air to a specific
direction, press the SWING
button and wait until the air
conditioner baffle swings to the
desired direction. Press the
button again to hold it.
Sleep mode setting
• Press the button to activate sleep
mode. This function is available
under COOL, HEAT & AUTO mode.
• In COOL mode, the set temperature
will increase 1.0°F after 30 minutes,
2°F after 1 hour and a total of 4°F
after 2 hours.
• In HEAT mode, the set temperature
will decrease 2°F after 30 minutes,
4°F after 1 hour and a total of 5°F
after 2 hours.
OFF Timer Setting
• Press the SET button will activate
the off timer function.
• Set the desired off time by pressing
the SET button continuously.
• Press the CLR button to cancel the
off timer setting.
Clock Time Setting
• Press button + or - to
increase or decrease the
clock time.
Symbol Identification
Cool Dry Fan Heat Sleep Power Timer Auto Fan Speed
low
me
d
hig
h
A
uto

IM 818 Page 19
Netware 2 - Wired Wall Control (Optional)
Features:
1. Modes - Cool, Heat, Auto, Dry, Fan and Off.
2. Temperature Range: 60° F to 86° F. (Press both arrows
simultaneously to convert from °C to °F or °F to °C).
3. Timer - Seven day clock capable of a different On/Off
time for each day of the week. Note: Hold button is used
to temporarily override timer.
4. Shows time of day.
5. Electronic lockout to prevent tampering.
6. Fan Speeds - Low, medium, high and auto.
7. Sleep - Sets temperature back for sleeping.
8. Swing - Swings or positions air baffle for better air dis-
tribution.
9. Display normally shows room temperature. (Momen-
tarily shows set point when a change is made.)
10. Heat symbol ( ) blinks while outdoor coil defrosts
(heat pump only).
11. Error codes blink on display:
E1 - Room sensor loose or defective.
E2 - Indoor coil sensor loose or defective.
E3 - Outdoor coil sensor loose or defective.
E4 - Compressor cycling on overload.
E5 - Low refrigerant charge.
For more detail, see manual that ships with the Wall Control.
SLEEP FAN MODE
SET TEMP
SWING ON TIMER OFF TIMER
HOLD DAY HOUR MINUTE
CLOCK
ON/OFF
°F
°C
COOL
TEMP.
HEAT
TEMP.
ROOM
TEMP.
MON TUE WED THU FRI SAT SUN


ON
OFF
AM
PM
TIME ACTIVATE SET TIMER SET CLOCK
SET CLOCK DRY AUTO COOL HEAT FAN
AUTO SLEEP
SWING
Ã

Page 20 IM 818
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 timeto provide the increased rate of
dehumidification. As a result, the room temperature dif-
ferential 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
coil warms up.
• When the set temperature is achieved, the indoor fan will
operate until the coil cools down.
Overheating protection (heat pump only)
• In case the coil overheats (145°F), the compressor will
cut out.
Frost prevention
• If the indoor coil starts to frost, an LED light will blink to
indicate that the unit is in defrost.
Fan speed and rated cooling capacity
• The rated cooling capacity is provided at high indoor fan
speed.
• The cooling capacity is slightly lower when the unit is
operating at MEDIUM and LOW fan speed.
Operating Conditions
Cooling
* 32°F on size 20 and 25, 23°F on size 30, 40 and 50 with optional Low Ambient
Kit.
Heating (heat pump only)
Ts = Dry Bulb Temperature, Th = Wet Bulb Temperature
Overall Checking
Ensure that:
1. The unit has been mounted properly.
2. Refrigerant tubing connections have been checked for
leaks.
3. Proper wiring and circuit breakers have been installed.
Drainage check:
Check condensate drain for leaks and proper flow. See Drain
Test, page 6.
Test run:
Check the following items:
• Are all electrical plugs firmly inserted into there recept-
cales?
• Is there any abnormal sound from the unit?
• Is there any abnormal vibration on the unit itself or piping?
Confirm that:
1. Condenser fan is running, with warm/cold air blowing off
the outdoor unit. (Cooling only/Heat Pump)
2. Evaporator blower is running and discharge cool/warm air.
(Cooling only/Heat Pump)
Note: The control incorporates a 3 minute randum start
delay in the circuit. Thus, it requires about 3 minutes
before the outdoor unit will start.
Temperature Ts (dry bulb) °F Th (wet bulb) °F
Minimum Indoor 61 52
Maximum Indoor 90 73
Minimum Outdoor 66* 24
Maximum Outdoor 114 75
Temperature Ts °F Th °F
Minimum Indoor 61 —
Maximum Indoor 86 —
Minimum Outdoor 16 21
Maximum Outdoor 75 64