McQuay MWMXG Series User manual

INVERTER WALL MOUNTED SPLIT TYPE
AIR CONDITIONER (G Series)
INSTALLATION MANUAL
Group: INVERTER
Part Number: A08014078756
Date: FEBRUARY 2005
IM-WMXG-0205-McQuay
© 2005 McQuay International

i
All dimensions are in mm / (in)
Indoor Unit (MWMXG Series)
OUTLINE AND DIMENSIONS
INSTALLATION
PLATE
Dimension A B C D E F G H I J K L M N O
10 / 15G / GR 899 260 198 590 246 185 124 8 56 50 419 495 50 128 132
(35,4) (10,2) (7,8) (23,2) (9,7) (7,3) (4,9) (0,3) (2,2) (2,0) (16,5) (19,5) (2,0) (5,1) (5,2)
A
B
FRONT VIEW
TOP VIEW C
SIDE VIEW
DF G
EH
O
N
I
I
JK
L
M

ii
Indoor Unit (MWMXG Series)
All dimensions are in mm / (in)
Dimension
20 / 25G / GR
I
48
(1,9)
H
8
(0,3)
G
51
(2,0)
F
99
(3,9)
E
294
(11,6)
D
912
(35,9)
C
220
(8,6)
B
310
(12,2)
A
1060
(41,7)
O
160
(6,3)
N
138
(5,4)
M
160
(6,3)
L
403
(15,9)
K
354
(13,9)
J
43
(1,7)
FRONT VIEW
TOP VIEW
SIDE VIEW
INSTALLATION
PLATE
A
B
C
A
B
DF
G
MH
I
I
O
N
M
K
L
J
CENTER LINE

iii
Outdoor Unit (MLCX Series)
All dimensions are in mm / (in)
Dimension A B C D E F G H I J K L M N O
10 / 15C / CR 700 521 250 485 175 36 95 93 86 68 441 130 111 15 18
(27,5) (20,5) (9,8) (19,1) (6,8) (1,4) (3,7) (3,6) (3,3) (2,6) (17,3) (5,1) (4,3) (0,5) (0,7)
3
(0,1)
B
EF
NCN
KLL
M
30
(1,2)
A
D
19
(0,7)
C
GH
IJ
O
80
(3,1) 65
(2,6)

iv
Dimension A B C D E F G H I J K L M N O
20 / 25C / CR 855 730 328 513 182 44 93 149 101 113 603 126 164 17 47
(33,7) (28,7) (12,9) (20,2) (7,2) (1,7) (3,7) (5,9) (4,0) (4,4) (23,7) (5,0) (6,4) (0,7) (1,9)
Dimension P Q R S T
20 / 25C / CR 32 3 23 73 75
(1,3) (0,1) (0,9) (2,9) (3,0)
NOTICE
This product is subjected to Waste of Electrical and Electronic Equipment Regulations (WEE
E
Regulations). The waste product shall be separately collected by specific collection and treatment centre
.
P
lease refer to local authorithy for these centres. This is only applicable to European Union countries
.
Ce produit est soumis
à
la r
à
é
r
r
é
chets
d
es
é
é
lectriques e
t
é
lectroniques (r
é
r
r
é
chet doi
t
ê
tre collect
é
t
t
s
é
par
é
r
r
m
ent par un centre de collect
e
et de traitement s
p
é
cifique. Veuillez vous r
é
r
r
f
é
f
f
é
s locales pour conna
î
a
a
tre ces centres. Ceci
îî
é
enne
.
Questo prodotto
è
soggetto alle disposizioni RAEE (Rifiuti di apparecchiature elettriche ed elettroniche)
.
à
ritirato da un centro incaricato del ritiro e smaltimento. Per conoscere il
à
n
ome del centro pertinente, contattare le autori
t
à
locali. Questa disposizione
à
è
valida solamente i paes
i
d
el
l
’
U.
E
.
é
ctrico y Electr
ó
n
ico en materia d
e
ñ
ñ
ado ser
á
í
fico
íí
de colecc
i
ó
í
ó
n
Europea
.
Dieses Produkt unterliegt den Bestimmungen zur Entsorgung von elektrischen und elektronische
n
G
er
ä
ä
ä
tes
ää
getrennt vom Hausm
ü
m
ll bei Ihrer
ö
r
tlichen
M
ü
ö
ä
ndiges Abfall-Amt. Dieser
ää
Hinweis gilt nur f
ü
f
f
rL
ä
nder der Europ
ää
ä
ischen Union
.
п
р
авилам
и
п
о
у
тилизаци
и
отхо
д
о
в
(WEEE Re
g
ulations).
и
.
,
.
Э
т
и
п
р
авил
а
Ев
р
опейског
о
.
B
A
Q
R
ST
DO
KLL
CN
P
M
N
FE
C
GH
IJ
All dimensions are in mm / (in)

1-1
English
This manual provides the procedures of installation to ensure a safe and good standard of operation for the air
conditioner unit.
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.
INSTALLATION MANUAL
INVERTER WALL MOUNTED SPLIT TYPE AIR CONDITIONER
COOLING ONLY
R22
WMX20G/MWMX020G
SLV20B/MLCV020B
R410A
5WMX10G/M5WMX010G
5SLX10C/M5LCX010C
5WMX15G/M5WMX015G
5SLX15C/M5LCX015C
5WMX20G/M5WMX020G
5SLX20C/M5LCX020C
5WMX25G/M5WMX025G
5SLX25C/M5LCX025C
Part No.: A08014078756
HEAT PUMP
R410A
5WMX10GR / M5WMX010GR
5SLX10CR / M5LCX010CR
5WMX15GR / M5WMX015GR
5SLX15CR / M5LCX015CR
5WMX20GR / M5WMX020GR
5SLX20CR / M5LCX020CR
5WMX25GR / M5WMX025GR
5SLX25CR / M5LCX025CR
IM-WMXG-0205 (1)-McQuay

1-2
CONTENTS
Before installing the air conditioner unit, please read the following safety precautions carefully.
SAFETY PRECAUTIONS
- Outline And Dimensions page i-iv
- Safety Precautions page 2
- Installation Diagram page 3
- Installation Of The Outdoor Unit page 3
- Installation Of The Indoor Unit page 4
- Refrigerant Piping page 5
- Electrical Wiring Connection page 6
- Special Precautions When Dealing
with R410A Unit page 6
- Vacuuming and Charging page 7
- Indicator Lights page 8
- Air Conditioner Unit Operation page 9
- Operating Range page 9
- Electrostatic Filter page 10
- Auto Random Re-Start Function page 10
- Service And Maintenance page 11
- Troubleshooting page 12
!Caution
Please take note of the following important points when installing.
• Do not install the unit where leakage of flammable gas may occur.
If gas leaks and accumulates around the unit, it may cause fire ignition.
• Ensure that the drainage piping is connected properly.
If the drainage piping is not connected properly, it may cause water leakage.
• Do not overcharge the unit.
This unit is factory pre-charged. Overcharge will cause over-current or damage to the compressor.
• Ensure that the units panel is closed after service or installation.
Unsecured panels will cause the unit to operate noisily.
• Sharp edges and coil surfaces are potential locations which may cause injury hazards. Avoid from
being in contact with these places.
!Warning
• Installation and maintenance should 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 installed in accordance with the national wiring regulation.
• Ensure that the rated voltage of the unit corresponds to that of the name plate before commencing wiring work
according to the wiring diagram.
• The unit must be GROUNDED to prevent possible hazards due to insulation failure.
• All electrical wiring must not touch the refrigerant piping, compressor or any moving parts of the fan motors.
• Confirm that the unit has been switched OFF before installing or servicing the unit.

1-3
English
INSTALLATION DIAGRAM
Indoor Unit
Refrigerant Piping
Air Discharge
Nozzle
Air Intake
Drain Hose
Signal Receiver
Indicator
Lights
Air Intake
Grille
Back Housing
ON/OFF Switch
Front Frame
Air Filter
Outdoor Unit
Dimension A B C D
Minimum Distance, 300 1000 300 500
mm (in) (11.8) (39.4) (11.8) (19.7)
INSTALLATION OF THE OUTDOOR UNIT
The outdoor unit must be installed in such a way, so as to
prevent short circuit of the hot discharged air or obstruc-
tion to the smooth air flow. Please follow the installation
clearances shown in the figure. Select the coolest possible
place where intake air temperature is not greater than the
outside air temperature (maximum 45°C).
Installation clearances
Note: If there is any obstacle higher than 2m, or if there is
any obstruction at the upper part of the unit, please allow
more space than the figure indicated in the above table.
Condensed Water 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 in a snowy and chilly area, con-
densed water may freeze in the base. In such case,
please remove plug at the bottom of unit to smooth the
drainage.
Obstacle
Return Air
Service Access
Obstacle
Obstacle
Return Air
Discharge Air
Obstacle
Please remove side
plate when connect-
ing the piping and
connecting cord
PUSH & PULL UP
BASE
A
DRAIN
ELBOW DRAIN
ELBOW
PLUG
AB
CD

1-4
INSTALLATION OF THE INDOOR UNIT
The indoor unit must be installed in such a way so as to
prevent short circuit of the cool discharged air with the hot
return air. Please follow the installation clearance shown in
the figure. Do not place the indoor unit where there could
be direct sunlight shining on it. Also, this location must be
suitable for piping and drainage, and be away from doors
or windows.
Routing Of Piping
Remove the screw holding the front panel.
Maintenance &
Servicing Space
Air Flow
Direction
Higher Than
Eye Level
The refrigerant piping can be routed to the unit in a
number of ways (left or right from the back of the unit), by
using the cut-out holes on the casing of the unit (see figure).
Bend the pipes carefully to the required position in order to
align it with the holes. For the right hand and rear side out,
hold the bottom of the piping and then position it to the
required direction (see figure). The condensation drain hose
can be taped to the pipes.
Correct
1
23
4
5
Piping Routing
Right & Rear Side Routing
Drain hose
Fix with vinyl tape
Unit piping
50.0 mm 50.0 mm
50.0 mm
Hole With Cone Drill
Indoor Side Outdoor Side
Mounting Installation Plate
Ensure that the wall is strong enough to withstand the weight
of the unit. Otherwise, it is necessary to reinforce the wall
with plates, beams or pillars.
Use the level gauge for horizontal mounting, and fix it with
4 suitable screws.
In case the rear piping draws out, drill a hole 65mm in di-
ameter with a cone drill, slightly lower on the outside wall
(see figure).
Mount The Unit Onto The Installation Plate
Hook the indoor unit onto the upper portion of the
installation plate (Engage the two hooks at the rear top of
the indoor unit with the upper edge of the installation plate).
Ensure that the hooks are properly seated on the
installation plate by moving it to the left and right.
Water Drainage Piping
The indoor drain pipe must be in a downward gradient for
smooth drainage. Avoid situations that are likely to cause
water to leak.
End
Dipped
Into
Water
Water
Leaking
Water
Leaking
Water
Leaking
Wrong Wrong Wrong
Drain
Water Drainage
Screw position in the wall
Ø 65.0 mm Hole in the wall
1. Hook the unit onto the installation plate.
Screw position in the wall
72.0
Centre Line
Ø 65.0 mm Hole in the wall
Water
Retention

1-5
English
Piping Length & Elevation
If the pipe is too long, both the capacity and reliability of
the unit will drop. As the number of bends increases,
resistance to the flow of refrigerant system increases, thus
lowering cooling capacity.As a result, the compressor may
become defective. Always choose the shortest path and
follow the recommendations as tabulated below:
REFRIGERANT PIPING
Outdoor Unit
Indoor Unit
Ø Tube, D A (mm)
Inch mm Imperial Rigid
1/4" 6.35 1.3 0.7
3/8" 9.52 1.6 1.0
1/2" 12.70 1.9 1.3
5/8" 15.88 2.2 1.7
3/4" 19.05 2.5 2.0
Piping Connection To The Units
• Align the center of the piping and tighten the flare nut
sufficiently with fingers.
• Finally, tighten the flare nut with the torque wrench until
the wrench clicks.
Pipe Size mm / (in) Torque Nm / (ft - lb)
6.35 (1/4) 18 (13.3)
9.53 (3/8) 42 (31.0)
12.7 (1/2) 55 (40.6)
15.88 (5/8) 65 (48.0)
19.05 (3/4) 78 (57.6)
Indoor Piping Flare Nut
Flared Tube
Flare Joint
Spanar Torque Wrench
Cutting Copper Tube
1/4t
Remove Burr Indoor
Copper Tube
Swaging Block
Piping Works
• 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 being done. This will eliminate soot formation on
the inside walls of the copper tubings.
• Cut the connection pipe with a pipe cutter.
• Remove burrs from cut edges of the pipes with remover.
Hold the end of the pipe downwards to prevent metal chips
from entering the pipe.
• Insert the flare nuts, mounted on the connection parts of
both the indoor unit and outdoor unit onto the copper pipes.
• Flare the pipe with extra length above the flaring tool as
shown in the table.
• The flared edge must be even and not cracked or scratched.
Remark: The refrigerant pre-charged in the outdoor unit
is for piping length up to 7.62 m/25 ft.
Model
Maximum length, m (ft), L
Max. elevation, m (ft), H
Max. number of (90º) bends
Liquid pipe size
Gas pipe size
10 15 20 25
12 (39) 12 (39) 15 (49) 15 (49)
5 (16.4) 5 (16.4) 8 (26.2) 8 (26.2)
10 10 10 10
1/4" 1/4" 1/4" 1/4"
3/8" 1/2" 1/2" 5/8"