38MGQ
Multi-Zone Ductless System
Sizes 18, 27, 36 and 48
Installation Instructions
NOTE: Read the entire instruction manual before starting the installation.
TABLE OF CONTENTS
PAGE
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . . . . 2
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
SYSTEM REQUIREMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
PIPING REQUIREMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
DIMENSIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
CLEARANCES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
INSTALLATION GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
INSTALLATION TIPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
OUTDOOR UNIT INSTALLATION . . . . . . . . . . . . . . . . . . . . 11
ELECTRICAL DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
CONNECTION DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . 13
NOTE: Image for illustration purposes only. Actual model may be
slightly different.
START−UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
OUTDOOR UNIT DIAGNOSTIC GUIDES . . . . . . . . . . . . . . 17
SAFETY CONSIDERATIONS
Recognize safety information. This is the safety−alert symbol !! .
When you see this symbol on the unit and in instructions or
manuals, be alert to the potential for personal injury. Understand
these signal words: DANGER, WARNING, and CAUTION.
These words are used with the safety−alert symbol. DANGER
identifies the most serious hazards which will result in severe
personal injury or death. WARNING signifies hazards which could
result in personal injury or death. CAUTION is used to identify
unsafe practices which may result in minor personal injury or
product and property damage. NOTE is used to highlight
suggestions which will result in enhanced installation, reliability, or
operation.
WARNING
!
Installing, starting up, and servicing air−conditioning equipment
can be hazardous due to system pressures, electrical components,
and equipment location (roofs, elevated structures, etc.).
Only trained, qualified installers and service mechanics should
install, start−up, and service this equipment.
Untrained personnel can perform basic maintenance functions such
as cleaning coils. All other operations should be performed by
trained service personnel.
When working on the equipment, observe precautions in the
literature and on tags, stickers, and labels attached to the
equipment.
Follow all safety codes. Wear safety glasses and work gloves. Keep
quenching cloth and fire extinguisher nearby when brazing. Use
care in handling, rigging, and setting bulky equipment.
Read these instructions thoroughly and follow all warnings or
cautions included in literature and attached to the unit. Consult
local building codes and current editions of the National Electrical
Code ( NEC ) NFPA 70. In Canada, refer to current editions of the
Canadian electrical code CSA 22.1.
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
Before installing, modifying, or servicing system, main
electrical disconnect switch must be in the OFF
position. There may be more than 1 disconnect switch.
Lock out and tag switch with a suitable warning label.
!
CAUTION
EQUIPMENT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
Do not bury more than 36 in. (914 mm) of refrigerant pipe
in the ground. If any section of pipe is buried, there must be
a 6 in. (152 mm) vertical rise to the valve connections on
the outdoor units. If more than the recommended length is
buried, refrigerant may migrate to the cooler buried section
during extended periods of system shutdown. This causes
refrigerant slugging and could possibly damage the
compressor at start−up.
GENERAL
These instructions cover the installation, start−up and servicing of
the multi−zone outdoor unit connected to up to five indoor fan coil
units. For approved combinations, please refer to the Product Data.
2
PARTS LIST
Part
No.
1
Name of Part
Qty
1
-
Oudoor Unit
Literature package including installation instructions and
warranty
-
Grommett to help fix the outdoor unit (helps with
vibration prevention during operation)
4
-
Drain Hose and Drain Joint
1
1
■ Outdoor
1
Fig. 1 - Parts List
The following units are covered in these installation instructions.
Table 1—Unit Sizes
SYSTEM TONS
1.50
2.25
3.00
4.00
kBTUh
18,000
27,000
36,000
48,000
VOLTAGE - PHASE
208/230-1
208/230-1
208/230-1
208/230-1
3
OUTDOOR MODEL
38MGQC18---3
38MGQD27---3
38MGQF36---3
38MGQF48---3
SYSTEM REQUIREMENTS
Allow sufficient space for airflow and service of the unit. See Fig. 2 for the required minimum distances between the unit, walls or ceilings.
PIPING REQUIREMENTS
IMPORTANT: Both refrigerant lines must be insulated separately.
The minimum refrigerant line length between the indoor and outdoor units is 10 ft. (3 m). The following lengths are allowed.
Table 2—Piping Lengths
SYSTEM SIZE
Min. Piping Length per each indoor unit
Standard Piping Length per each indoor unit
Max. outdoor-indoor height difference
(OU higher than IU)
Max. outdoor-indoor height difference
(IU higher than OU)
Max. height different between indoor units
Max. Length per each indoor unit
Max. Piping Length with no additional
refrigerant charge per System
(Standard Piping length x No. of Zones)
Total Maximum Piping Length per system
Additional refrigerant charge
(between Standard – Max piping length)
Piping
Refrigerant
ft (m)
ft (m)
18K
10 (3)
25 (7.5)
27K
10 (3)
25 (7.5)
36K
10 (3)
25 (7.5)
48K
10 (3)
25 (7.5)
ft (m)
32(10)
32(10)
32(10)
32(10)
ft (m)
49(15)
49(15)
49(15)
49(15)
ft (m)
ft (m)
32(10)
66(20)
32(10)
82(25)
32(10)
98(30)
32(10)
98(30)
ft (m)
49(15)
74(22.5)
98(30)
123(37.5)
Ft. (m)
98(30)
147(45)
196(60)
245(75)
Oz/ft (g/m)
0.16(15)
0.16(15)
0.16(15)
0.16(15)
Gas Pipe Size
in (mm)
3/8*2 (9.52*2)
3/8*2 (9.52*3)
Liquid Pipe Size
Refrigerant Type
Charge Amount
in (mm)
1/4 *2 (6.35*2)
R410A
4.19 (1.9)
1/4 *3 (6.35*3)
R410A
6.17 (2.8)
1/2 *1 (12.7*1)
+ 3/8*3 (9.5*3)
1/4 *4 (6.35*4)
R410A
7.94 (3.6)
1/2 *2 (12.7*2)
+ 3/8*3 (9.5*3)
1/4 *5 (6.35*5)
R410A
10.14 (4.6)
Lbs (kg)
NOTE: The refrigerant charge included is adequate for the outdoor unit’s maximum number of zones multiplied by the standard piping length per
zone.
Table 3—Indoor High Wall
Indoor High Wall 40MAQ
SIZE
Pipe Connection Size - Liquid
Pipe Connection Size - Suction
Indoor Cassette 40MB*C
SIZE
Pipe Connection Size - Liquid
Pipe Connection Size - Suction
Indoor Ducted 40MB*D
SIZE
Pipe Connection Size - Liquid
Pipe Connection Size - Suction
Indoor Floor Console 40MB*F
SIZE
Pipe Connection Size - Liquid
Pipe Connection Size - Suction
in.
in.
9
1/4"
3/8"
12
1/4"
1/2"
18
1/4"
1/2"
24
3/8"
5/8"
Table 4—Indoor Cassette
in.
in.
9
1/4"
3/8"
12
1/4"
1/2"
18
1/4"
1/2"
Table 5—Indoor Ducted
in.
in.
9
1/4"
3/8"
12
1/4"
1/2"
18
1/4"
1/2"
24
3/8"
5/8"
Table 6—Indoor Floor Console
in.
in.
4
9
1/4"
3/8"
12
1/4"
1/2"
Refrigerant Piping:
Line sets to be sized based on the connection size of the indoor unit. Each pipe should be insulated individually.
Conversion Joints:
The outdoor unit may include a package of conversion joints to facilitate installation of various sizes of fan coils. These joints are to be
connected to the outdoor unit as needed to match the line set size.
Table 7—Conversion Joints
No. of ZONES
2 zone
3 zone
SIZE
18
27
4 zone
36
5 zone
48
ADAPTOR
3/8”--1/2”
3/8”--1/2”
3/8”--1/2”
1/2”--3/8”
1/2”--3/8”
1/4”--3/8”
1/2”--5/8”
3/8”--1/2”
QUANTITY
2
3
3
1
2
2
2
3
Table 8—Additional Refrigerant Charge
Unit Size
No. of Zones
Charge oz. (kg.)
18
27
36
48
2
3
4
5
67.02 (1.9)
98.76 (2.8)
126.98 (3.6)
162.26 (4.6)
Additional Charge Required
After ft. (m)
49 (15)
74 (22.5)
98 (30)
123 (37.5)
Additional Charge
oz./ft. (g/m)
0.16 (15)
0.16 (15)
0.16 (15)
0.16 (15)
Total Maximum Piping
Length ft. (m.)
98 (30)
147 (45)
196 (60)
245 (75)
Additional Refrigerant Calculation
Sum Total Liquid Pipe ft. (m) - Additional Charge Required After ft. (m.) x Additional Charge oz./ft. (g/m) 0.16 (15)
NOTES:
If the calculation results in a negative number no additional refrigerant is required.
ELECTRONIC EXPANSION VALVES IN THE OUTDOOR UNIT ARE USED AS METERING DEVICES.
Wiring
All wires must be sized per NEC (National Electrical Code) or
CEC (Canadian Electrical Code) and local codes. Use the Electrical
Data table MCA (minimum circuit amps) and MOCP (maximum
over current protection) to correctly size the wires and the
disconnect fuse or breakers respectively.
Per caution note, only stranded copper conductors with a 600 volt
rating and double insulated copper wire must be used. The use of
BX cable is not recommended.
Recommended Connection Method for Power and
Communication Wiring − Power and Communication Wiring:
The main power is supplied to the outdoor unit. The field supplied
14/3 power/communication wiring from the outdoor unit to the
indoor unit consists of four (4) wires and provides the power for
the indoor unit. Two wires are high voltage AC power, one is
communication wiring and the other is a ground wire.
Recommended Connection Method for Power and
Communication Wiring (To minimize communication wiring
interference) Power Wiring:
The main power is supplied to the outdoor unit. The field supplied
power wiring from the outdoor unit to the indoor unit consists of
three (3) wires and provides the power for the indoor unit. Two
wires are high voltage AC power and one is a ground wire. To
minimize voltage drop, the factory recommended wire size is 14/2
stranded with a ground.
Communication Wiring:
A separate shielded stranded copper conductor only, with a 600
volt rating and double insulated copper wire, must be used as the
communication wire from the outdoor unit to the indoor unit.
Please use a separate shielded 16GA stranded control wire.
!
CAUTION
EQUIPMENT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
S Wires should be sized based on NEC and local codes.
S Use copper conductors only with a minimum 600 volt
rating and double insulated copper wire.
!
CAUTION
EQUIPMENT DAMAGE HAZARD
Failure to follow this caution may result in equipment damage
or improper operation.
S Be sure to comply with local codes while running wire from
indoor unit to outdoor unit.
S Every wire must be connected firmly. Loose wiring may
cause terminal to overheat or result in unit malfunction. A
fire hazard may also exist. Therefore, be sure all wiring is
tightly connected.
S No wire should be allowed to touch refrigerant tubing,
compressor or any moving parts.
S Disconnecting means must be provided and shall be located
within sight and readily accessible from the air conditioner.
S Connecting cable with conduit shall be routed through hole
in the conduit panel.
5
DIMENSIONS − OUTDOOR
Table 9—Dimensions
UNIT SIZE
Height
Width
Depth
Weight -Net
18
27.56(700)
33.27(845)
12.60(320)
114.63(52)
in (mm)
in (mm)
in (mm)
lbs (kg)
27
31.89(810)
37.20(945)
15.55(395)
154.76(70.2)
Fig. 2 - Outdoor Dimensions Size 18
NOTE: No master valves available on Size 18K.
6
36
31.89(810)
37.20(945)
15.55(395)
169.75(77)
48
36.93(1369)
53.9(938)
15.43(392)
255.50(115.9)
DIMENSIONS − OUTDOOR (CONTINUED)
Suction
Fig. 3 - Outdoor Dimensions Size 27
7
DIMENSIONS − OUTDOOR (CONTINUED)
Suction
Fig. 4 - Outdoor Dimensions Size 36
8
DIMENSIONS − OUTDOOR (CONTINUED)
Suction
Fig. 5 - Outdoor Dimensions Size 48
9
CLEARANCES − OUTDOOR
A
Air-inlet
E
D
B
C
Air-outlet
Fig. 6 - Clearances Outdoor
Table 10— Clearances Outdoor Values
MINIMUM VALUE
in. (mm)
24 (609)
24 (609)
24 (609)
4 (101)
4 (101)
UNIT
A
B
C
D
E
10
INSTALLATION GUIDE
Insulate each tube with minimum 3/8−in. (10 mm) wall thermal
pipe insulation. Inserting the tubing into the insulation before
making the connections saves time and improves installation quality.
1. The unit is equipped with multiple pairs of service valves.
Each pair is clearly marked (color and letter) to identify the
indoor unit circuits. In the outdoor unit wiring area, each
indoor unit interconnecting terminal block is marked (letter)
the same as the corresponding pair of service valves. The
indoor units must be piped and wired in matched sets (A to A;
B to B, etc.).
2. It is not required to use all of the available fan coil
connections if the application does not require them at the
current time. The system can be expanded at any time.
3. Conversion joints are supplied with the outdoor unit. They
are required for certain fan coil combinations. These joints
are to be connected to the outdoor unit as needed to match
the line set size.
4. Remove the service connection, if provided with the unit.
Up to five fan coil units can be connected to one outdoor unit.
Refer to the Product Data for approved combinations.
INSTALLATION TIPS
Ideal installation locations include:
Outdoor Unit
S A location which is convenient to installation and not exposed to
strong wind.
S A location which can bear the weight of the outdoor unit and
where the outdoor unit can be mounted in a level position.
S A location with appropriate clearances as outlined in Fig. 6.
S Do not install the indoor or outdoor units in a location with
special environmental conditions. For those applications, contact
your Ductless representative.
OUTDOOR UNIT INSTALLATION
1. Use a rigid base to support unit in a level position.
2. Locate outdoor unit and connect piping and wiring.
!
90
DŽ
Oblique Roughness
Burr
CAUTION
A150767
Fig. 8 - Cut the Pipe
5. Remove all the burrs from the cut cross section of the pipe
avoiding any burrs inside the tubes.
6. Remove the flare nuts attached to the indoor and outdoor
units.
7. Install the correct size flare nut onto the tubing and make a
flare connection. Refer to Table 11 for the flare nut spaces.
Table 11—Flare Nut Spacing
EQUIPMENT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
Excessive torque can break flare nut depending on
installation conditions.
NOTE: Install the outdoor unit on a rigid base to reduce noise levels
and vibration. Determine the optimal air outlet direction to prevent
discharged air from being blocked. If the installation site is exposed to
strong winds such as a coastal areas, ensure the fan’s proper operation
by installing the unit lengthwise along the wall or use dust or shield
plates. If the unit needs to be suspended, the installation bracket should
comply with the suspension requirements in the installation bracket
diagram. The installation wall should be solid brick, concrete or the
same intensity construction, or take steps to reinforce and dampen the
support. The connection between the bracket and the wall as well as
the bracket and the air conditioner should be firm, stable and reliable.
Ensure there is no obstacle which may block the radiating air.
A (mm)
OUTER DIAM. (mm)
Max.
0.05 (1.3)
0.06 (1.6)
0.07 (1.8)
0.09 (2.2)
Ø1/4”(6.35)
Ø3/8”(9.52)
Ø1/2”(12.7)
Ø5/8”(15.88)
Handle
"A"
Bar
Min.
0.03(0.7)
0.04(1.0)
0.04(1.0)
0.08(2.0)
Bar
Yoke
Cone
Copper pipe
Clamp handle
Strong
wind
Red arrow mark
A150768
Fig. 9 - Flare Nut Spacing
8. Apply a small amount of refrigerant oil to the flare
connection on the tubing.
9. Align center of the pipes and/or service valve.
A07350
Fig. 7 - High Wind Installation
MAKE REFRIGERANT PIPING CONNECTIONS
(OUTDOOR UNIT)
IMPORTANT: Use refrigeration grade tubing ONLY. No other
type of tubing may be used. Use of other types of tubing will void
the manufacturer’s warranty.
Piping Guide:
S Do not open service valves or remove protective caps from
tubing ends until all the connections are made.
S Bend tubing with bending tools to avoid kinks and flat spots.
S Keep the tubing free of dirt, sand, moisture, and other
contaminants to avoid damaging the refrigerant system.
S Avoid sags in the suction line to prevent the formation of oil traps.
Indoor unit tubing
Flare nut
Piping
A150769
Fig. 10 - Align Pipe Center
10. Connect both the liquid and gas piping to the indoor unit
11. Tighten the flare nut using a torque wrench as specified in
the Table 12.
12. Complete the installation.
Table 12—Tightening Torque
PIPE DIAMETER
INCH (mm)
Ø1/4” (6.35)
Ø3/8” (9.52)
Ø1/2” (12.7)
Ø5/8” (15.88)
11
TIGHTENING TORQUE
Ft-lb
N-m
10 to 13
13.6 to 17.6
24 to 31
32.5 to 42.0
37 to 46
50.1 to 62.3
50 to 60
67.7 to 81.3
INSTALL ALL POWER AND INTERCONNECTING
WIRING TO OUTDOOR UNIT
Outdoor
1. Mount outdoor power disconnect.
2. Run power wiring from main box to disconnect per NEC
and local codes.
3. Remove field wiring cover (if available) from unit by
loosening screws.
4. Remove caps on conduit panel.
5. Connect the conduit to the conduit panel (see Fig. 11).
6. Properly connect both power supply and control lines to
terminal block per the connection diagram.
7. Ground unit in accordance with NEC and local electrical
codes.
8. Use lock nuts to secure conduit.
9. Reinstall field wiring cover.
unit
Terminal Block
Ove
r 1.5
7" (
40m
m)
Conduit panel
G
Conduit
A07455
Fig. 11 - Field Wiring
CAUTION
!
EQUIPMENT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
S Be sure to comply with local codes while running wire
from indoor unit to outdoor unit.
S Every wire must be connected firmly. Loose wiring may
cause terminal to overheat or result in unit malfunction. A
fire hazard may also exist. Therefore, be sure all wiring is
tightly connected.
S No wire should be allowed to touch refrigerant tubing,
compressor or any moving parts.
S Disconnecting means must be provided and shall be
located within sight and readily accessible from the air
conditioner.
S Connecting cable with conduit shall be routed through
hole in the conduit panel.
ELECTRICAL DATA
Table 13—Multi Zone Outdoor Unit
UNIT SIZE
18
27
36
48
SYSTEM VOLTAGE
OPERATING VOLTAGE
COMPRESSOR
VOLT / PHASE / HZ
MAX / MIN
RLA
FLA
HP
W
253 / 187
9.7
8.85
13.4
13.5
3
3
3
3
0.16
0.16
0.16
0.11
50
120
120
85
208-230/1/60
*Permissible limits of the voltage range at which the unit will operate satisfactorily.
LEGEND
FLA - Full Load Amps
MCA - Minimum Circuit Amps
RLA - Rated Load Amps
12
OUTDOOR FAN
MCA
MAX
FUSE/CB
AMP
15
19
27
29
20
25
40
50
CONNECTION DIAGRAMS
Fig. 12 - Connection Diagram Size 18
Fig. 13 - Connection Diagram Size 27
13
CONNECTION DIAGRAMS (CONT)
Fig. 14 - Connection Diagram Size 36
Fig. 15 - Connection Diagram Size 48
Notes:
1. Do not use thermostat wire for any connection between indoor and outdoor units.
2. All connections between indoor and outdoor units must be as shown. The connections are sensitive to polarity and will result in a fault code.
14
DRAIN CONNECTIONS
SYSTEM VACUUM AND CHARGE
Install drains must meet local sanitation codes.
Install the outdoor unit drain joint
Fit the seal into the drain joint, then insert the drain joint into the
base pan hole of the outdoor unit. Rotate 90_ to securely assemble
them. Connect the drain joint with an extension drain hose to avoid
condensate from draining off the outdoor unit during the heating
mode.
Seal
Drain joint
Base pan hole
Seal
Base pan
Drain
joint
Fig. 16 - Drain Joint
Images are for illustration purposes only.
CAUTION
!
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
Never use the system compressor as a vacuum pump.
Refrigerant tubes and indoor coil should be evacuated using the
recommended deep vacuum method of 500 microns. The alternate
triple evacuation method may be used if the procedure outlined
below is followed. Always break a vacuum with dry nitrogen.
NOTE: All units have a Master Suction and Liquid Line Service
Valve (excluding the 18,000 BTU unit).
1. Completely tighten the flare nuts A, B, C, D, E. Fully open
all circuits service valves, connect the manifold gage charge
hose to the charge port of the low side Master service valve
to evacuate all circuits at the same time (see Fig. 17).
2. Connect the charge hose to the vacuum pump.
3. Open (fully) the low side of the manifold gage (see Fig. 18).
4. Start the vacuum pump.
5. Evacuate using either deep vacuum or triple evacuation
method.
6. After the evacuation is complete, fully close the low side of
manifold gage and stop operation of vacuum pump.
7. The factory charge contained in the outdoor unit is good for
up to 25 ft. (8 m) of line length. For refrigerant lines longer
than 25 ft. (8 m), add refrigerant, up to the allowable length,
as specified in the System Requirements section.
8. Disconnect the charge hose from charge connection of the
low side service valve.
9. Securely tighten caps of service valves.
Refrigerant
Outdoor Unit
A
Low Side
B
High Side
Indoor Unit
C
D
Service Valve
A07360
Fig. 17 - Service Valve
Manifold Gage
500 microns
Low side valve
High side valve
Charge hose
Charge hose
Vacuum pump
Low side valve
A07361
Fig. 18 - Manifold
15
Deep Vacuum Method
The deep vacuum method requires a vacuum pump capable of
pulling a vacuum of 500 microns and a vacuum gage capable of
accurately measuring this vacuum depth. The deep vacuum method
is the most positive way of assuring a system is free of air and
liquid water (see Fig. 19).
5000
4500
4000
3500
3000
2500
2000
1500
1000
500
EVACUATE
BREAK VACUUM WITH DRY NITROGEN
WAIT
EVACUATE
BREAK VACUUM WITH DRY NITROGEN
WAIT
MICRONS
LEAK IN
SYSTEM
EVACUATE
CHECK FOR TIGHT, DRY SYSTEM
(IF IT HOLDS DEEP VACUUM)
VACUUM TIGHT
TOO WET
TIGHT
DRY SYSTEM
0
1
2
3 4
5
MINUTES
6
RELEASE CHARGE INTO SYSTEM
A95425
Fig. 20 - Triple Evacuation Method
7
A95424
Fig. 19 - Deep Vacuum Graph
Triple Evacuation Method
The triple evacuation method should only be used when vacuum
pump is only capable of pumping down to 28 in. of mercury
vacuum and system does not contain any liquid water.
Refer to Fig. 20 and proceed as follows:
1. Pump system down to 28 in. of mercury and allow the
pump to continue operating for an additional 15 minutes.
2. Close service valves and shut off vacuum pump.
3. Connect a nitrogen cylinder and regulator to system and
open until system pressure is 2 psig.
4. Close service valve and allow system to stand for 1 hr.
During this time, dry nitrogen will be able to diffuse
throughout the system absorbing moisture.
5. Repeat this procedure as indicated in Fig. 20. System will
then be free of any contaminants and water vapor.
Final Tubing Check
IMPORTANT: Check to be certain the factory tubing on both
indoor and outdoor unit has not shifted during shipment.
Ensure tubes are not rubbing against each other or any sheet
metal. Pay close attention to feeder tubes, making sure wire ties
on feeder tubes are secure and tight.
16
START−UP
Test Operation
Perform test operation after completing gas leak and electrical
safety check. See the indoor unit installation instructions and
owner’s manual for additional start up information.
SYSTEM CHECKS
1. Conceal the tubing where possible.
2. Ensure the drain tube slopes downward along its entire
length.
3. Ensure all tubing and connections are properly insulated.
4. Fasten tubes to the outside wall, when possible.
5. Seal the hole through which the cables and tubing pass.
OUTDOOR UNIT
1. Are there unusual noises or vibrations during operation?
Explain the Following Items To Customer (with the aid of the
Owner’s Manual):
2. Explain care and maintenance.
3. Present the Owner’s Manual and installation instructions to
customer.
OUTDOOR UNIT DIAGNOSTIC GUIDES
This unit has on−board diagnostics. Error codes are displayed on the wired remote controller and the outdoor unit microprocessor board with
colored LED lights. Table 14 explains the error codes on both.
Table 14—Outdoor Unit Error Display
DISPLAY
LED STATUS
IDU Error
IDU Error
F4
E6
E0
Outdoor EEPROM malfunction
E2
Communication malfunction between indoor and outdoor units
E3
Communication malfunction between IPM board and outdoor main board
E4
E5
E6
PFC module protection
E8
Outdoor fan speed has been out of control (Only for DC fan motor models)
E9
Wrong wiring connection of 24K indoor unit
F1
No A Indoor unit coil outlet temp. sensor or connector of sensor is defective
——
——
F2
No B Indoor unit coil outlet temp. sensor or connector of sensor is defective
——
——
F3
No C Indoor unit coil outlet temp. sensor or connector of sensor is defective
——
——
F4
No D Indoor unit coil outlet temp. sensor or connector of sensor is defective
——
——
F5
No E Indoor unit coil outlet temp. sensor or connector of sensor is defective
——
——
——
——
P2
P3(P1)
——
E1
E2
——
——
Open or short circuit of outdoor temperature sensor (T3、T4、T5、T2B)
F2
E6
Voltage protection
P1
P0
——
——
F5
——
——
——
F6
No F Indoor unit coil outlet temp. sensor or connector of sensor is defective
P0
Temperature protection of compressor top
P1
High pressure protection
——
P2
Low pressure protection
——
——
P3
Current protection of compressor
——
——(P2)
P4
Temperature protection of compressor discharge
——
——
P5
High temperature protection of condenser
——
——
P6
IPM module protection
P0
E5
17
Copyright 2016 Carrier Corporation. S 7310 W. Morris St. S Indianapolis, IN 46231
Edition Date: 04/16
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
18
Catalog No: 38MGQ-03SI
Replaces: 38MGQ-02SI