40VMD006-016
Multiport Distribution Controller for
Variable Refrigerant Flow (VRF) Systems
Installation and Maintenance Instructions
CONTENTS
Page
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . .1,2
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2, 3
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-12
Step 1 — Unpack and Inspect Units . . . . . . . . . . . . 4
• PROTECTING UNITS FROM DAMAGE
• PREPARING JOBSITE FOR UNIT INSTALLATION
• IDENTIFYING AND PREPARING UNITS
Step 2 — Position the Unit . . . . . . . . . . . . . . . . . . . . 4
Step 3 — Mount the Unit . . . . . . . . . . . . . . . . . . . . . . 4
• INSTALLING HANGER BOLTS
• MOUNTING UNIT
Step 4 — Connect Piping . . . . . . . . . . . . . . . . . . . . . . 5
• CONDENSATE PIPING
• REFRIGERANT PIPING
• PIPING BETWEEN MDC AND INDOOR UNIT
• TWINNING MDC PORTS
• PIPING BETWEEN MDC AND SUB MDC
• PIPING BETWEEN MDC AND OUTDOOR UNIT
ELECTRICAL REQUIREMENTS . . . . . . . . . . . . 13-17
Opening the Electrical Control Box . . . . . . . . . . . . 13
Complete Electrical Connections. . . . . . . . . . . . . 14
MDC UNIT ADDRESSING . . . . . . . . . . . . . . . . . . . 17
Setting the Unit Address . . . . . . . . . . . . . . . . . . . . 17
Merged Port Setting. . . . . . . . . . . . . . . . . . . . . . . . 17
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . 17, 18
LED Indication Lamp Instructions . . . . . . . . . . . . 17
Error Code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
SW8/SW9 Query Instruction . . . . . . . . . . . . . . . . . 18
TEST RUN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
APPENDIX A — DIP SWITCH SETTINGS. . . . . . . . 19
SAFETY CONSIDERATIONS
Improper installation, adjustment, alteration, service,
maintenance, or use can cause explosion, fire, electrical shock,
or other conditions which may cause death, personal injury or
property damage. The qualified installer or agency must use
factory authorized kits or accessories when modifying this
product.
Follow all safety codes. Wear safety glasses, protective
clothing, and work gloves. Use quenching cloth for brazing
operations. Have fire extinguisher available. Read these
instructions thoroughly and follow all warnings or cautions
included in literature and attached to the unit. Consult local
building codes and the current editions of the National
Electrical Code (NEC) ANSI/NFPA (American National
Standards Institute/National Fire Protection Association) 70.
For Canada, refer to the current editions of the Canadian
Electrical Code CSA (Canadian Standards Association) C22.1.
Understand the signal words — DANGER, WARNING,
and CAUTION. DANGER identifies the most serious hazards
which will result in severe personal injury or death.
WARNING signifies hazards that could result in personal
injury or death. CAUTION is used to identify unsafe practices,
which could result in minor personal injury or product and
property damage.
Recognize safety information. This is the safety-alert
symbol ( ). When this symbol is displayed on the unit and in
instructions or manuals, be alert for the potential of personal
injury. Installing, starting up, and servicing the equipment can
be hazardous due to system pressure, electrical components,
and equipment location.
WARNING
Electrical shock can cause personal injury and death. Shut
off all power to this equipment during installation. There
may be more than one disconnect switch. Tag all
disconnect locations to alert others not to restore power
until work is completed.
WARNING
When installing the equipment in a small space, provide
adequate measures to avoid refrigerant concentration
exceeding safety limits due to refrigerant leak. In case of
refrigerant leak during installation, ventilate the space
immediately. Failure to follow this procedure may lead to
personal injury.
WARNING
DO NOT USE TORCH to remove any component. System
contains oil and refrigerant under pressure.
To remove a component, wear protective gloves and
goggles and proceed as follows:
a. Shut off electrical power to unit.
b. Recover refrigerant to relieve all pressure from
system using both high-pressure and low pressure
ports.
c. Traces of vapor should be displaced with nitrogen
and the work area should be well ventilated.
Refrigerant in contact with an open flame produces
toxic gases.
d. Cut component connection tubing with tubing cutter
and remove component from unit. Use a pan to catch
any oil that may come out of the lines and as a gage
for how much oil to add to the system.
e. Carefully unsweat remaining tubing stubs when
necessary. Oil can ignite when exposed to torch
flame.
Failure to follow these procedures may result in personal
injury or death.
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 17-40VMD001-01
Printed in U.S.A.
Form 40VMD-2SI
Pg 1
3-17
Replaces: 40VMD-1SI
GENERAL
CAUTION
The 40VMD multiport distribution controller (MDC) is a
distribution box for refrigerant to multiple indoor fan coil units
installed in a given heat recovery system.
The equipment is initially protected under the
manufacturer’s standard warranty; however, the warranty is
provided under the condition that the steps outlined in this
manual for initial inspection, proper installation, regular
periodic maintenance, and everyday operation of the unit be
followed in detail. This manual should be fully reviewed in
advance before initial installation, start-up and any
maintenance. Contact your local sales representative or the
factory with any questions BEFORE proceeding.
See Fig. 1 for model number nomenclature. Table 1 lists
physical data for each unit size. Table 2 shows components that
may or may not be used for a particular installation.
DO NOT re-use compressor oil or any oil that has been
exposed to the atmosphere. Dispose of oil per local codes
and regulations. DO NOT leave refrigerant system open to
air any longer than the actual time required to service the
equipment. Seal circuits being serviced and charge with
dry nitrogen to prevent oil contamination when timely
repairs cannot be completed. Failure to follow these
procedures may result in damage to equipment. For
information about replacement oil type and viscosity, see
the Installation, Start-Up, and Service Instructions for the
38VMAR outdoor unit.
40
VM
D 006 M
—
—
3
Equipment Type
Volta ge (V-Ph-Hz)
40 — Indoor Unit
3 — 208/230-1-60
Product Type
VM — VRF
Blank
Model Type
L — Large
“—” — Standard
D — Multiport Distribution Controller
VRF
Number of Ports
Unit Function
006 — 6 port
008 — 8 port
010 — 10 port
016 — 16 port
M — Main
S — Sub
LEGEND
— Va ria ble Re frige ra nt Flow
Fig . 1 — Model Number Nomenclature
Table 1 — 40VMD MDC Physical Data
UNIT 40VMD
POWER S UPPLY (V-Ph-Hz)
NUMBER OF PORTS
UNIT
Unit Dime ns io ns , W x H x D (in.)
Pac king Dime ns io ns , W x H x D (in.)
Main MDC Ne t/Gro s s We ig ht (lb)
S ub-MDC Ne t/Gro s s We ig ht (lb)
DES IGN PRES S URE, Hig h/Lo w (ps ig )
CONNECTING WIRING
Po we r Wiring
S ig nal Wiring
CONDENS ATE DIAMETER, OD (in.)
LEGEND
AWG
—
NEC
—
MDC
—
006
008
6
8
010
208/230-1-60
10
016
016L
16
16
46-1/2 x 12-3/4 x 22-5/8
53-7/8 x 18 x 33-1/8
190/269
196/273
183/262
37 x 12-3/4 x 22-5/8
44-1/2 x 18 x 33-1/8
143/216
132/205
137/209
137/209
126/198
130/203
580/320
S ize d pe r NEC a nd loca l code s ba s e d on na me pla te e le ctrica l da ta
2-core s hie lde d twis te d pa ir ca ble 20 AWG - 16 AWG
1
American Wire Gage
National Electrical Code
Multiport Distribution Controller
2
F
9/16
G
B
D
E
1 -5/8
9/16
13/16
C
H
A
40VMD MODEL SIZE
006
008
010
016/016L
A
39 1/4
B
35 3/8
27 1/2
48 3/4
NOTE: All dimensions shown in inches.
DIMENSIONS (in.)
D
E
C
22 5/8
13 7/8
44 7/8
F
12 3/4
G
H
33 7/8
37
43 1/4
46 1/2
Fig . 2 — 40VMD Dimensional Drawing
Table 2 — Components Shipped With Unit
NAME
SHAPE
QUANTITY
Adapter pipe for liquid line
Same as MDC
ports
Adapter pipe for gas line
Same as MDC
ports
FUNCTION
Use for indoor unit (capacity 05~15Btu/h)
Adapter pipe for liquid line
2
Adapter pipe for low pressure line
2
Adapter pipe for high pressure line
2
Clamp
2
To fasten the connector between flexible condensate pipe
and MDC condensate
Condensate connection
2
Reducer for smaller pipe diameter (only for size 018 unit)
PQE connection wire
Use for the connecting between the main MDC and 1 sub
MDC unit (available only with the sub MDC)
No. of Ports + 3 Connect outdoor unit, indoor unit and MDC
Adapter pipe (for High pressure line)
1
Only for 40VMD016ML-3; used for connection to 072-240
size outdoor unit.
Adapter pipe (for Low pressure line)
1
.
LEGEND
MDC – Multiport Distribution Controller
3
INSTALLATION
•
Step 1 — Unpack and Inspect Units — Units are
packaged for shipment to avoid damage during normal transit
and handling. It is the receiving party’s responsibility to inspect
the equipment upon arrival. Any obvious damage to the carton
and/or its contents should be reported on the bill of lading and a
claim should be filed with the transportation company and the
factory. Unit should always be stored in a dry place, and in the
proper orientation as marked on the carton.
•
•
•
dimensions, refer to Table 1 and Fig. 2. Allow clearance
according to local and national codes.
Confirm that the ceiling is able to support the weight of
the unit. See Table 1 for nominal weight.
There should be enough room within the false ceiling for
installation and maintenance (see Fig. 3).
The false ceiling should be horizontal and leveled.
See Fig. 3 below.
(Unit: in.[mm])
CAUTION
27 1/2[700] or more
To avoid equipment damage, do not lift unit by the drain
pipe or refrigerant piping. Unit should be lifted using the
mounting brackets.
19 5/8[500]
3 7/8[100]
or more
After determining the condition of the carton exterior,
carefully remove each unit from the carton and inspect for
hidden damage. Any hidden damage should be recorded, a
claim should be filed with the transportation company, and the
factory should be notified. In the event a claim for shipping
damage is filed, the unit, shipping carton, and all packing must
be retained for physical inspection by the transportation
company. All units should be stored in the factory shipping
carton with internal packaging in place until installation.
PROTECTING UNITS FROM DAMAGEDo not apply
force or pressure to the piping or drain stub-outs during
handling. All units should be handled by the chassis or as close
as possible to the unit mounting point locations.
The unit must always be properly supported. Temporary
supports used during installation or service must be adequate to
hold the unit securely. To maintain warranty, protect units
against hostile environments (such as rain, snow or extreme
temperature), theft, vandalism, and debris on jobsite.
Equipment covered in this manual is not suitable for outdoor
installations. Do not allow foreign material to fall into drain
pan. Some units and/or job conditions may require some form
of temporary covering during construction.
PREPARING JOBSITE FOR UNIT INSTALLATIONTo
save time and to reduce the possibility of costly errors, set up a
complete sample installation in a typical room at jobsite.
Check all critical dimensions such as pipe and wire connection
requirements. Refer to job drawings and product dimension
drawings as required. Instruct all trades in their parts of the
installation. Units must be installed in compliance with all
applicable local code requirements.
IDENTIFYING AND PREPARING UNITS Be sure power
requirements match available power source. Refer to unit
nameplate and wiring diagram. In addition:
• Check all tags on unit to determine if shipping screws are
to be removed. Remove screws as directed.
or more
19- 5/8[500] or more
Fig. 3 — False Ceiling Required Clearance
Select the unit position with the following points in mind:
• The unit should be installed in a position that is suitable
to support the total weight of the unit, refrigerant piping
and condensate.
• Proper access should be provided for maintenance for
refrigerant piping, A 2-ft clearance is recommended all
around the unit for service.
• The unit should not be positioned directly above any
obstruction.
• The unit must be installed square and level.
• The condensate drain should have sufficient downward
slope (1 in. per 100 in.) in any horizontal run between
unit and drain.
IMPORTANT: Be sure that the ceiling grid is supported
separately from the unit. The ceiling grid must not be
supported by any part of the unit or any associated
wiring or piping work.
Step 3 — Mount the Unit
INSTALLING HANGER BOLTS — Install the hanger bolts
at the locations shown in Fig. 2, top view. Use 3/8-in. allthreaded rod. For unit weight, see Table 1.
Step 2 — Position the Unit
MOUNTING UNIT — The unit can now be lifted on to the
hanging rods for mounting.
1. Use rods and fasteners to suspend the unit at the factoryprovided mounting holes.
2. Adjust the height of the unit until the bottom is level with
the false ceiling, with adequate space to provide enough
pitch for the drain.
3. Secure the unit in position with locknuts and washers on
both sides of the mounting bracket. Ensure that the
threaded rod does not protrude more than 2 in. below the
mounting brackets as shown in Fig. 4.
DANGER
Units must not be installed where they may be exposed to
potentially explosive or flammable atmosphere. If this
instruction is not followed exactly, a fire or explosion may
result, causing property damage, injury, or loss of life.
Install the unit in a location that meets the following
requirements:
• Allow adequate space for installation, service clearance,
piping, and electrical connections. For specific unit
4
When connecting refrigerant piping follow these procedures:
• The refrigerant piping should be dry and free of dust and
other impurities.
• The number of bends in the refrigeration piping must be
fewer than 15.
• The bending angle of the refrigerant pipe should not
exceed 90 degrees and the bending radius should be as
large as possible to prevent any breakage in piping.
• Use a torque wrench for flare nuts. Refer to Table 3 for
flare nut torque recommendations.
a40-1722
Fig . 4 — Threaded Rod
Table 3 — Flare Nut Torque Recommendations
Step 4 — Connect Piping
Outside Diameter (in.)
1/4
3/8
1/2
5/8
CONDENSATE PIPING — The unit is supplied with a
1 in. OD drain connection to connect copper or PVC drain
piping as shown in Fig. 5.
Drain pan
Clamp
Condensate connection
PVC water
pipe (1[ĭ25])
• Before connecting any piping to the MDC cut the tips off
every gas and liquid pipe of the MDC unit to release the
gas in the system as shown in Fig. 7, even if the pipe is
not being used for this installation.
Hard PVC binder
Condensate outlet
Recommended Torque (ft-lb)
15
26
41
48
a
Fig. 5 — Connecting the Condensate Drain
When installing condensate piping, follow these
recommendations:
• Condensate piping should slope downward in the
direction of condensate flow, with a minimum gradient
of 1 in. per 100 inches.
• Condensate piping must not be installed where it may be
exposed to freezing temperatures.
• Condensate pipe hangers should be spaced 59 in. or less
between hangers.
• For additional recommendations see Fig. 6.
c
LEGEND
a — Brazed Cap
b — Cut Here
c — MDC Unit
Fig. 7 — Cutting the Tip off the Gas and Liquid
Lines
PIPING BETWEEN MDC AND INDOOR UNIT —
When connecting indoor units to an MDC follow these
procedures:
• Check maximum height drop and length of refrigerant
piping between the indoor units and MDC. To ensure the
drop and length are acceptable, refer to the refrigerant
piping allowable limits in the manual.
• Refrigerant piping connection between indoor units
should be performed once the units are secured at their
respective installation locations.
• The refrigeration piping starts at the indoor unit and ends
at the MDC.
• Before insulating the suction and liquid refrigeration
pipes, perform pressure and leak tests. For details, see
the outdoor unit installation manual. Insulating both
suction and liquid refrigerant pipes is mandatory.
• Vacuuming and charging of the system should be carried
out as described in the outdoor unit installation manual.
Pipe hanger
7 7/8” or more
59” or less
Minimum 2”
59” or less
Ceiling
b
Refrigerant pipe
(Gradient: 1 in. per 100 in.)
Fig. 6 — Space Required for Condensate Drain
Installation
REFRIGERANT PIPING
CAUTION
Multiport Distribution Controller’s (MDCs) are shipped
from the factory with brazed caps on all lines and
pressurized with nitrogen to keep the system clean.
Cutting the tip relieves the pressure in the system. Cut
all the tips on the MDC piping prior to removing any
brazed caps. Failure to cut the tip before removing the
brazed cap may cause equipment damage or personal
injury.
CAUTION
MDCs are shipped from the factory with brazed caps on
all lines and pressurized with nitrogen to keep the
system clean. Failure to remove the brazed cap before
connecting piping will result in equipment malfunction
or damage.
5
Table 5 — Connecting Gas Pipes to the Indoor Unit
• Before connecting piping between the indoor units and
the MDC remove the brazed cap as shown in Fig. 8.
Depending on the size of the connecting pipe the brazed
cap may be left on or removed.
INDOOR
UNIT
CAPACITY
(kBtu/h)
a b
CONNECTION DIAGRAM
5, 7, 9, 12, 15
a
c
c
b
18, 24, 27, 30,
36, 48, 54
LEGEND
a — Cut Here
b — Brazed Cap
c — MDC Unit
a
LEGEND
a — MDC Unit
b — Pipe Accessory
c — Pipe 1/2
d — Pipe 5/8
Fig . 8 — Removing the Brazed Cap
• Table 4 shows the piping diameters to use when
connecting the indoor units and the MDC.
• Table 5 and 6 show how to connect the liquid and gas
lines to the indoor units.
• Table 7 shows the number of indoor units that can be
connected to the MDC and sub MDC.
Table 6 — Co nne c ting Liquid Pipe s to the Indo o r Unit
INDOOR UNIT
CAPACITY
(kBtu/h)
LIQUID S IDE
(in.)
5, 7, 9, 12, 15
18, 24, 30, 36, 48, 54
72
96
1/
4
3/
8
a
GAS
S IDE
(in.)
1/
2
5/
8
3 /8
7/8
3/
7/
8
CONNECTION DIAGRAM
5, 7, 9, 12, 15
Table 4 — Piping Diameter Between MDC and
Indoor Units
INDOOR UNIT
(kBtu/h)
d
c
b
18, 24, 27, 30,
36, 48, 54
a
d
LEGEND
a — MDC Unit
b — Pipe Accessory
c — Pipe 1/4
d — Pipe 3/8
8
Table 7 — Combination Table
MDC IMAGE
MAIN MDC
MAX NUMBER
OF INDOOR
UNITS
CONNECTED
TO MAIN MDC
006
12
008
16
010
20
016
32
016L
32
MAX NUMBER
OF SUB MDC
MAX NUMBER
OF INDOOR
UNITS
CONNECTED
TO SUB MDC
2
24
MAX CAPACITY OF TOTAL INDOOR UNIT
(kBtu/h)
MAIN MDC
SUB MDC (1)
SUB MDC (2)
324
126
168
504
6
PIPING BETWEEN MDC AND SUB MDC — Three pipes
will be used to connect the main MDC and the sub MDC. The
selection of the sub MDC should follow the requirements of
Table . For connecting sub MDC to main MDC, use the high
pressure, low pressure and liquid pipes as shown in Fig. 10 and
11.
TWINNING MDC PORTS
CAUTION
Connecting an indoor unit with a capacity greater than
54 kBtu/h may result in damage to equipment.
Table 9 — Sub MDC Selection
For indoor units with capacities greater than 54 kBtu/h, two
MDC ports must be twinned using the Y-joint to create a single
port. The two ports to be paired should be next to each other.
Refer to Y-joint “G” in the piping layout; see Fig. 9. The first
port of the pair should have an odd number and second port
should be the next sequential even number. For example: 1 and
2, 3 and 4, or 5 and 6 and so on. You cannot pair 2 and 3, 4 and
5, or 6 and 7.
Table 8 shows the pipe diameters to use when connecting
the MDC and the Y-joint.
MAIN MDC MODEL
006
008
010
016/016L
Table 8 — Piping Between the MDC and Y-Joint
TOTAL CAPACITY OF
INDOOR UNITS
(kBtu/h)
> 54
LIQUID PIPE
(in.)
GAS PIPE
(in.)
3/
5/
8
8
MDC
G
G
CORRECT
MDC
G
G
INCORRECT
LEGEND
G — Y-Joint
Fig . 9 — Twinning Ports with the Y-Joint
7
S UB MDC UNIT
006
006
008
006
008
010
006
008
010
016
Gas pipe
Liquid pipe
Gas pipe
High pressure
pipe
Low pressure
pipe
Main MDC
Liquid pipe
High pressure
pipe
Low pressure
pipe
Sub MDC
Indoor
unit
Liquid pipe
Liquid pipe
Drain pipe
Drain pipe
Low pressure
Indoor
unit
High pressure
Outdoor
unit
Fig . 10 — Connecting Main MDC to a Single Sub MDC
Gas pipe
Gas pipe
Liquid pipe
High pressure
pipe
Low pressure
pipe
Main MDC
Liquid pipe
High pressure
pipe
Low pressure
pipe
Sub MDC1
Indoor
unit
Liquid pipe
Liquid pipe
Drain pipe
Gas pipe
Drain pipe
Low pressure
Indoor
unit
Liquid pipe
High pressure
Outdoor
unit
High pressure
pipe
Low pressure
pipe
Sub MDC2
Indoor
unit
Liquid pipe
Drain pipe
Fig . 11 — Connecting Main MDC to Two Sub MDCs
Refer to Table 10 for suggested pipe diameters. When
connecting high pressure, low pressure, and liquid pipes
between main MDC and sub MDC refer to Tables 11-13.
Table 11 — Connecting Liquid Pipes Between Main
MDC and Sub MDC
Table 10 — Piping Between Main MDC and Sub
MDC
DOWNS TREAM
TOTAL CAPACITY
OF INDOOR UNITS
(kBtu/h)
~72
73~108
109~126
127~144
145~168
HIGH
PRES S URE
S IDE
(in.)
5 /8
3 /4
7/
8
LOW
PRES S URE
S IDE
(in.)
3 /4
7/
8
1 1 /8
INDOOR
UNIT
CAPACITY
(kBtu/h)
LIQUID
S IDE
(in.)
CONNECTION DIAGRAM
~108
3/
8
1/
2
5/
8
a
b
c
d
109~144
a
e
b
145~168
a
LEGEND
a — MDC Unit
b — Sub MDC Pipe Accessory
c — Pipe 3/8
e — Pipe 1/2
f — Pipe 5/8
8
f
Table 12 — Connecting Low Pressure Pipes
Between Main MDC and Sub MDC
INDOOR
UNIT
CAPACITY
(kBtu/h)
Table 13 — Co nne c ting Hig h Pre s s ure Pipe s Be twe e n
Main MDC and S ub MDC
INDOOR
UNIT
CAPACITY
(kbtu/h)
CONNECTION DIAGRAM
72
CONNECTION DIAGRAM
72
a
b
a
c
b
d
c
d
73~108
73~126
a
a
e
b
109~168
e
b
127~168
a
a
f
LEGEND
a — MDC Unit
b — Sub MDC Pipe Accessory
c — Pipe 3/4
d — Cut Here
e — Pipe 7/8
f — Pipe 1 1/8
f
LEGEND
a — Sub MDC unit
b — Pipe Accessory
c — Pipe 5/8
d — Cut here
e — Pipe 3/4
f — Pipe 7/8
For typical wiring and piping see Fig. 12. For a typical
example of running the refrigerant pipes see Fig. 13.
9
MDC
Check valves
ODU Side
SV1B-1
IDU Side
Tm3
Gas/Liquid
separator
PS3
SV1A-1
HEX1
Tm1
EXVC
EXVB
SVMC
PS1
PS2
HEX2
SVmB-n
EXVA
Tm2
SVP
SVME
SVmA-n
Check valves
SV1B-1
Tm3
SV1A-1
PS3
HEX2
SVmB-n
EXVA
Tm2
SVP
SVmA-n
LEGEND
EXV*
HEX
PS
SV*A-*, SV*B-*,
SVM*, SVP
Tm
—
—
—
—
Expansion Valve
Heat Exchanger
Pressure Sensor
Solenoid Valve
— Temperature Sensor
Fig . 12 —Typical Refrigerant Piping for MDC
10
Outdoor Unit
ON
NO.2 Sub MDC Unit
MDC-Main MDC or Sub MDC
S8
NO.2 Sub MDC Unit
6
5 4 3
Main MDC Sub MDC
ON
5 4 3
MDC-Main MDC or Sub MDC
Main MDC Sub MDC
2 1
ON
5 4 3
Indoor Indoor Indoor Indoor
NO.2
NO.3
NO.4
NO.5
NO.1 Sub MDC Unit
S8
S8
MDC-Indoor
Indoor Indoor Indoor Indoor Indoor
NO.1
NO.2
NO.3
NO.4
NO.5
Main MDC Unit
Main MDC Unit
6
NO.1
2 1
NO.1 Sub MDC Unit
6
MDC-Indoor
Indoor
MDC-Outdoor or Sub MDC
2 1
Outdoor
Sub MDC
Indoor Unit
NO.1
(P Q
)
Indoor Unit
NO.2
(P Q
)
Indoor Unit
NO.3
(P Q
)
Indoor Unit
NO.4
(P Q
)
Indoor Unit
NO.5
(P Q
)
LEGEND
MDC
— Multiport Dis tribution Controlle r
————
P iping Line
-—-—Control Wiring
NOTE: Field wiring must use copper conductors only.
Fig . 13 — Piping and Wiring Connections
11
MDC-Indoor
Indoor
NO.1
Indoor Indoor Indoor Indoor
NO.2
NO.3
NO.4
NO.5
PIPING BETWEEN MDC AND OUTDOOR UNIT
Table 15 — Connecting High Pressure Pipes with
the Outdoor Unit
CAUTION
OUTDOOR
UNIT
CAPACITY
(kBtu/h)
When connecting from an indoor unit to an outdoor unit,
the isolation valve at the outdoor unit should be in the
closed position throughout the refrigerant piping process.
Failure to follow this procedure may result in equipment
damage.
72
Figure 14 shows the typical piping layout between the
outdoor unit, MDC and sub MDC. Table 14 shows pipe
diameters to use when connecting the outdoor unit and main
MDC. Tables 15 and show how to connect low and high
pressure pipes to specific outdoor unit models.
Outdoor unit
CONNECTION DIAGRAM
a
b
c
d
96~120
a
e
b
System that requires mo re than 16 branch ports.
144~192
a
f
Sub MDC1
Standard/Main MDC
216~240
F
G
a
g
h
Sub MDC2
240L~336
H
a
LEGEND
a — MDC Unit
b — ODU Pipe Accessory
c — Pipe 5/8
d — Cut Here
e — Pipe 3/4
f — Pipe 7/8
g — ODU Pipe Accessory
h — Pipe 1 1/8
LEGEND
G, H ,Y — Y-Joint
Fig. 14 — Typical Piping Layout Between Outdoor
Unit and MDC
Table 14 — Main Piping Between Outdoor Unit and
Main MDC
OUTDOOR MODEL
(kBtu/h)
72
96
120
145
168
192
216
240
240L~288
312~336
HIGH PRESLOW PRESSURE SIDE (in.) SURE SIDE (in.)
5/8
3/4
7/8
3/4
7/8
1-1/8
1-1/8
1-3/8
1-5/8
12
h
Table 16 — Connecting Low Pressure Pipes with
the Outdoor Unit
OUTDOOR
UNIT
CAPACITY
(kBtu/h)
CAUTION
Any original factory wiring that requires replacement must
be replaced with wiring material having a temperature
rating of at least 105 C.
Ensure supply voltage to the unit, as indicated on the serial
plate, is not more than 10% over the rated voltage or 10%
under the rated voltage.
Failure to follow these recommendations may result in
equipment damage.
CONNECTION DIAGRAM
72
a
b
c
d
This equipment in its standard form is designed for an
electrical supply of 208/230-1-60. Any damage to or failure of
units caused by incorrect wiring or voltage is not covered by
warranty.
Electric wiring must be sized to carry the full load amp
draw. See Table 17 for main unit electrical data and Table 18
for sub unit electrical data.
96
a
e
b
120~216
a
f
Table 17 — 40VMD Main MDC Electrical Data
240
40VMD MDC UNIT S IZE
a
g
006
008
010
016/016L
h
D
240L~288
j
a
POWER S UPPLY
MCA
MOPD
0.73
0.89
15
1.05
1.54
MCA — Minimum Circuit Amps
MOPD — Ma ximum Ove rcurre nt
P rote ctive De vice
h
312~336
a
j
Table 18 — 40VMD Sub MDC Electrical Data
k
40VMD S UB MDC UNIT
S IZE
LEGEND
a — MDC Unit
b — ODU Pipe Accessory
c — Pipe 3/4
d — Cut Here
e — Pipe 7/8
f — Pipe 1-1/8
g — ODU Pipe Accessory
h — Pipe 1-3/8
k — Pipe 1-5/8
006
008
010
016
POWER S UPPLY
MCA
MOPD
0.69
0.85
15
1.01
1.49
LEGEND
MCA — Minimum Circuit Amps
MOPD — Maximum Overcurrent
Protective Device
ELECTRICAL REQUIREMENT
Installation of wiring must conform with local building
codes and with National Electric Code ANSI/NFPA 70, current
editions. Units must be electrically grounded in conformance
with the code. In Canada, wiring must comply with CSA
C22.1, Electrical Code.
Opening the Electrical Control Box Cover —
Follow the steps below when removing the top cover.
1. Remove the screws as shown in Fig. 15.
WARNING
Electrical shock can cause personal injury and death.
Disconnect power supply before making wiring
connections. There may be more than one disconnect
switch. Tag all disconnect locations to alert others not to
restore power until work is completed.
WARNING
All units must be wired strictly in accordance with the
wiring diagram furnished with the unit. Any wiring
different from the wiring diagram could result in personal
injury and property damage.
Fig. 15 — Removing the Top Cover Screws
13
Completing Electrical Connections — After the
2. Lift up the top cover about 1 5/8 in. and then push it
following the direction shown in Fig. 16.
pipe work is complete, the electrical supply can be connected
by routing the cable through the appropriate casing holes or
knockouts and connecting the supply and ground cables to the
unit’s power terminals.
Be sure the power wiring and control wiring do not cross, as
this might cause disturbance on the controls side.
Use 2-core stranded shielded twisted pair communication
wire. Make sure the control wire does not form a closed loop.
The control wire is polarity sensitive. Figures 19 and 20 show
how to connect the control wiring between the MDC and the
indoor unit. Wiring length limitations must be follow to avoid
any communication interference.
For typical communication wiring diagrams and MDC
wiring see Fig. 21-23.
Fig . 16 — Re mo ving the To p Co ve r
3. Follow the steps below when removing the cover of
electric control box:
4. Remove the screws as shown in Fig. 17.
MDC
IDU
P Q
P Q
Fig . 19 — 2-Core Stranded Shielded Twisted Pair
Communication Wire
(Available from Factory as an Accessory)
MDC
IDU
P Q
P Q
Fig . 17 — Re mo ving the Ele c tro nic Co ntro l Bo x Co ve r
S c re ws
5. Push the cover about 3/8 in. and then lift up the cover as
shown in Fig. 18.
Fig. 20 — 2-Core Stranded Shielded Twisted Pair
Communication Wire (Field-Supplied)
Fig . 18 — Re mo ving the Ele c tro nic Co ntro l Bo x Co ve r
14
Note:24v AC Power
Outdoor Unit
Touch Screen
Wired Controller
Centralized Controller
XY
HA HB
L5
P Q
X Y
HA HB
Indoor unit 1#
PQ
L6
L3
PQ
L7
L4
Indoor unit 2#
HA HB
L1
To No.1
indoor
PQ
L8
Main MDC unit
To outdoor
To No.2
indoor
HA HB
Indoor unit 3#
L3
To No.3
indoor
To Sub MDC
PQ
L9
Indoor unit 4#
L3
HA HB
PQ
L2
wired controller
Note:Power from IDU
HA HB
To No.1
indoor
Indoor unit 5#
HA HB
No.N Sub MDC unit
(1”
L3
To No.2
indoor
L10
PQ
To outdoor
L11
Indoor unit 6#
HA HB
L3
PQ
LEGEND
MDC — Multiport Dis tribution Controlle r
NOTE: Field wiring must use copper conductors only.
Fig . 21 — Heat Recovery Communication Wiring Diagram
15
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MDC UNIT ADDRESSING
TROUBLESHOOTING
Setting the Unit Address — The address switch [S8]
LED Indication Lamp Instructions — When the
LED indication lamp is intermittent flashing it means
communication error. Table 19 shows a description of what the
flashing LED lights mean.
of each MDC unit is set to “00” when the unit is shipped from
the factory.
• Set the address of the main MDC to “000”.
• Set the address of sub MDC to “000” or “010”
Table 19 — LED Light Description
Merged Port Setting — When two ports are merged to
connect a larger indoor unit (> 54 kBtu/h), the following
switches should be set to the “ON, ON” position.
S1: Port 1 and 2 pipes are merged, set to “ON, ON” position
S3: Port 3 and 4 pipes are merged, set to “ON, ON” position
S5: Port 5 and 6 pipes are merged, set to “ON, ON” position
S7: Port 7 and 8 pipes are merged, set to “ON, ON” position
The indoor unit communication cable is connected to one of
the two ports.
LED
NORMALLY
ON
LED1 Lamp
(Re d)
Outdoor unit ON
LED2 Lamp
(Blue )
S LOW FLAS H
FLAS H
Communica tion
e rror with outdoor unit
Indoor unit ON Indoor unit OFF Communica tion
unde r this micro unde r this micro e rror with indoor
proce s s or
proce s s or
unit
Outdoor unit
s ta ndby
Error Code — MDC error codes are displayed on the units
display (DSP1 and DSP2) as shown in Fig. 22 and 23. Table 20
shows display code definitions.
17
TEST RUN
Table 20 — Display Code Definitions
DISPLAY
S E0
S E1
S E2
S E3
S E4
S E5
S E6
S P1
SC ER
no ID
Before commencing a test run please check the following:
1. Ensure the MDC unit, indoor unit and outdoor unit are
installed correctly;
2. Ensure the piping and wiring are completed correctly;
3. Ensure there are no refrigerant leaks;
4. Ensure the drain is not clogged;
5. Ensure the piping is insulated;
6. Ensure the ground wiring is connected correctly;
7. Ensure the added refrigerant amount and added is correct,
based on the actual pipe length;
8. Ensure the supplied power voltage matches the voltage
on the unit nameplate;
9. Ensure the connected indoor unit quantity during the
quick check MDC query is the same as the actual
quantity;
DSP1 AND DSP2 DISPLAY DEFINITION
Communication error with outdoor unit
T1 temperature sensor error
T2 temperature sensor error
T3 temperature sensor error
High pressure sensor error
Intermediate pressure sensor error
Low pressure sensor error
High pressure protection
Commissioning test failure
No indoor unit under Indoor Unit 1
Indoor capacity overload under Indoor No.y
(y=X+1)
CS x
SW8/SW9 Query Instructions — When you press
either SW8 or SW9, the MDC’s LED display will show a
query code. Press SW8 to move up in number. Press SW9 to
move down in number (i.e., 00) and then it will display the
corresponding value. See Table 21 for an explanation of these
display codes.
NOTE: The main MDC and sub MDC have the same query
instructions. If the sub MDC does not have this parameter it
displays the value of the main MDC unit.
Table 21 — MDC Query Codes
DES CRIPTION
DIS PLAYED
Firs t and
S e c o nd Dig it
Third and
Fo urth Dig it
COMMENT
--03
--04
--05
--06
Numbe r of
Numbe r of
online micropro- online indoor
ce s s ors
units
Numbe r of ope n Numbe r of ope n
microproce s s ors
indoor units
Numbe r of cool- Numbe r of he a ting indoor units ing indoor units
Outdoor unit ope ra tion mode
Ope ning of EXVA
Ope ning of EXVB
Ope ning of EXVC
--07
Liquid inle t te mpe ra ture (T1)
--08
Liquid re frige ra ntte mpe ra ture (T2)
-Actua l va lue
Actua l va lue
Actua l va lue
Actua l va lue
(de gre e s C)
Actua l va lue
(de gre e s C)
--09
Bypa s s outle t te mpe ra ture (T3)
Actua l va lue
(de gre e s C)
--10
High pre s s ure (H-YL1)
Actua l va lue =
dis pla y va lue x
0.1 MP a
--11
Inte rme dia te pre s s ure (H-YL2)
--00
--01
--02
Actua l va lue
Actua l va lue
Actua l va lue
Actua l va lue =
dis pla y va lue x
0.1 MP a
--12
Low pre s s ure (L-YL1)
Actua l va lue =
dis pla y va lue x
0.01 MP a
--13
--14
Ve rs ion of s oftwa re
----
-Che ck e nd
18
APPENDIX A — DIP SWITCH SETTINGS
There are 2 sets of DIP switches on the main board. One set
is for twinning ports; the other set is for MDC identification.
Figures A and B show the settings for each parameter
controlled by a switch. Switches are shown in the default
settings. For switches S1, S3, S5, and S7 the switch must be set
to OFF, OFF or ON, ON.
ON
OFF
a
POSITION 1, 2 — MDC IDENTIFICATION
OFF, OFF — Main MDC (default)
ON, OFF — Sub MDC Box
OFF, ON — Sub MDC Box
ON, ON
— Reserved
v
ON
OFF
a
1 2 3
1 2
POSITION 1, 2 — S1 IDU PIPES SETTING
OFF, OFF
— Normal Mode (default)
ON, ON
— 2 Ports Twinned Together
ON
OFF
POSITION 1, 2 — S3 IDU PIPES SETTING
OFF, OFF
— Normal Mode (default)
ON, ON
— 2 Ports Twinned Together
a40-1925
1 2 3
POSITION 3 — MDC BOARD IDENTIFICATION
ON
— Second MDC Board
(This is set by the factory and cannot be changed)
OFF — Primary MDC Board
POSITION 1, 2 — S5 IDU PIPES SETTING
OFF, OFF
— Norma l Mode (de fa ult)
ON, ON
— 2 P orts Twinne d Toge the r
Fig. B — S8 Settings
POSITION 1, 2 — S7 IDU PIPES SETTING
OFF, OFF
— Normal Mode (default)
ON, ON
— 2 Ports Twinned Together
Fig. A — S1, S3, S5, and S7 Settings
19
© Carrier Corporation 2017
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 17-40VMD001-01
Printed in U.S.A.
Form 40VMD-2SI
Pg 20
3-17
Replaces: 40VMD-1SI
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