Only qualified personnel should install and service the equipment. The installation, starting up, and
servicing of heating, ventilating, and air-conditioning equipment can be hazardous and requires specific
knowledge and training. Improperly installed, adjusted or altered equipment by an unqualified person could
result in death or serious injury. When working on the equipment, observe all precautions in the literature
and on the tags, stickers, and labels that are attached to the equipment.
February 2013VRF-SVN34A-EN
DB68-03592A(1)
Page 2
Introduction
Read this manual thoroughly before operating or servicing
this unit.
Warnings, Cautions, and Notices
Safety advisories appear throughout this manual as
required. Your personal safety and the proper operation of
this machine depend upon the strict observance of these
precautions.
The three types of advisories are defined as follows:
WARNING
CAUTIONs
NOTICE
Important Environmental Concerns
Scientific research has shown that certain man-made
chemicals can affect the earth’s naturally occurring
stratospheric ozone layer when released to the
atmosphere. In particular, several of the identified
chemicals that may affect the ozone layer are refrigerants
that contain Chlorine, Fluorine and Carbon (CFCs) and
those containing Hydrogen, Chlorine, Fluorine and Carbon
(HCFCs). Not all refrigerants containing these compounds
have the same potential impact to the environment. Trane
advocates the responsible handling of all refrigerantsincluding industry replacements for CFCs such as HCFCs
and HFCs.
Important Responsible Refrigerant Practices
Trane believes that responsible refrigerant practices are
important to the environment, our customers, and the air
conditioning industry. All technicians who handle
refrigerants must be certified. The Federal Clean Air Act
(Section 608) sets forth the requirements for handling,
reclaiming, recovering and recycling of certain refrigerants
and the equipment that is used in these service procedures.
In addition, some states or municipalities may have
additional requirements that must also be adhered to for
responsible management of refrigerants. Know the
applicable laws and follow them.
Indicates a potentially hazardous
situation which, if not avoided, could
result in death or serious injury.
Indicates a potentially hazardous
situation which, if not avoided, could
result in minor or moderate injury. It
could also be used to alert against
unsafe practices.
Indicates a situation that could result in
equipment or property-damage only.
WARNING
Proper Field Wiring and Grounding
Required!
Failure to follow code could result in death or serious
injury. All field wiring MUST be performed by qualified
personnel. Improperly installed and grounded field
wiring poses FIRE and ELECTROCUTION hazards. To
avoid these hazards, you MUST follow requirements for
field wiring installation and grounding as described in
NEC and your local/state electrical codes.
WARNING
Personal Protective Equipment (PPE)
Required!
Failure to wear proper PPE for the job being undertaken
could result in death or serious injury. Technicians, in
order to protect themselves from potential electrical,
mechanical, and chemical hazards, MUST follow
precautions in this manual and on the tags, stickers,
and labels, as well as the instructions below:
•Before installing/servicing this unit, technicians
MUST put on all PPE recommended for the work
being undertaken. ALWAYS refer to appropriate
MSDS sheets and OSHA guidelines for proper PPE.
•When working with or around hazardous chemicals,
ALWAYS refer to the appropriate MSDS sheets and
OSHA guidelines for information on allowable
personal exposure levels, proper respiratory
protection, and handling recommendations.
•If there is a risk of arc or flash, technicians MUST put
on all PPE in accordance with NFPA 70E or other
country-specific requirements for arc flash
protection, PRIOR to servicing the unit.
Copyright
This document and the information in it are the property of
Trane and may not be used or reproduced in whole or in
part, without the written permission of Trane. Trane
reserves the right to revise this publication at any time and
to make changes to its content without obligation to notify
any person of such revision or change.
Trademarks
All trademarks referenced in this document are the
trademarks of their respective owners.
T = Cooling Only, Digital Scroll (VRF)
F = Cooling Only, DC Inverter (VRF)
S = Heat Pump, Digital Scroll (VRF)
H = Heat Pump, DC Inverter (VRF)
R = Heat Recovery (3-pipe), DC
Inverter (VRF)
K = Heat Recovery (3-pipe), Digital
Scroll (VRF)
S1 = Front service clearance
S2 = Back service clearance
See Figure 4, p. 9 for details.
You may install multiple outdoor units with a minimum 1 in.
(20 mm) of space between them, but reduced capacity may
occur depending on the installation environment.
Clearance requirements are waived for any unit sides that have
wind/snow protection ducts installed on them, due to the
wind/snow protection duct size, which exceeds clearance
requirements.
Front
Example 3: Multiple units inside pit
Example 4: Multiple units inside wall
Example 5: Multiple units inside pit
Front
Front
Front
Service Clearances
Install units as shown in the illustrations below, observing ventilation and service requirements.
Space requirements are based on cooling mode operation and an outdoor temperature of 95°F
(35°C). More space is required if the outdoor temperature is higher than 95°F (35°C) or if the area
is easily heated by solar radiation.
Figure 3. Minimum service clearances for single and multiple units
8 VRF-SVN34A-EN
4 (100)
4 (100)
4 (100)
4 (100)
4 (100)
4 (100)
20 (500)
24 (600)
20 (500)
Page 9
Figure 4. Dimension limits for pit
Front side
Front wall height recommendation: 60 in. (1500 mm) maximum.
Back wall height recommendation: 20 in. (500 mm) maximum.
Side wall height is unlimited.
If a wall exceeds the recommended height, an additional clearance of half of the exceeded height should be added
to the service clearance. (Clearances are given in Figure 3, p. 8).
S1 = Front service clearance
S2 = Back service clearance
h1 = Wall height in excess of 60 in. (1500 mm)
h2 = Wall height in excess of 20 in. (500 mm)
S1+h1/2
S2+h1/2
60 (1500)
h1
20 (500)
h2
Note: This figure refers to Figure 3, examples 1, 3, 5.
Preparing for Installation
Outdoor Unit Combinations
Use the following table to determine the size and number of outdoor units needed to achieve the
capacity requirements.
Follow these guidelines:
•Make sure to use indoor units that are compatible with the outdoor unit.
VRF-SVN34A-EN9
•The minimum capacity of an indoor unit is 7.5 MBH (7500 Btu/h).
•Indoor units can be connected within the ranges indicated in Ta b le 2 and Ta bl e 3.
•If the total capacity of the connected indoor units exceeds the indicated maximum capacity, the
cooling and heating capacity of the indoor unit may decrease.
•You can connect a maximum of 64 indoor units to the outdoor unit. The maximum quantity of
connectable indoor units is 64 because the outdoor unit supports a maximum of 64
communication addresses.
•If you choose to select outdoor unit combination other than the ones in Ta bl e 2 or Ta bl e 3, the
total capacity of connected indoor units is allowed to be 50%–130% of the outdoor unit capacity:
[0.5 x total outdoor unit capacity
total connected indoor unit capacity 1.3 × total outdoor unit
capacity].
Page 10
Preparing for Installation
Table 2. Outdoor unit combinations: 6–20 ton capacity
Capacity
Outdoor unit
number
Total number
outdoor
Combined
outdoor
unit
Nominal
Capacity
Rated
Capacity
Tot al
capacity
of
connected
indoor
units
(cooling)
•Pipe installation sockets (see Ta bl e 4 and Figure 5).
Table 4. Pipe installation socket size chart
Model numberConnection type
4TV*0072***** (6 ton)
4TV*0096***** (8 ton)
4TV*0120***** (10 ton)
4TV*0144***** (12 ton)
(a) Cut socket as needed for 8, 10, and 12 ton units.
(a)
Unit connection
Field connection
Unit connection 1-1/8 in.1/2 in.7/8 in.
Field connection 7/8 in.3/8 in.3/4 in.7/8 in.3/8 in.
Unit connection
(a)
Field connection3/4 in.1-1/8 in.
Unit connection
(a)
Field connection1/2 in.7/8 in.
Preparing for Installation
Heat recoveryHeat pump
High-
pressure
GasLiquid
3/4 in.3/8 in.5/8 in.No3/4 in.3/8 in.No
1-1/8 in.1/2 in.
1-1/8 in.
5/8 in.1-1/8 in.
gas
7/8 in.
Socket
needed
Yes
Yes
Yes1-1/8 in.1/2 in.No
GasLiquid
1 in.1/2 in.
1 in.
1/2 in.Yes
Socket
needed
Yes
Figure 5. Pipe installation sockets
Ta b le 5 shows optional accessories for outdoor units.
Table 5. Optional accessories
AccessoryModel numberSpecification
4YDK1509B0051A51 MBH and below
4YDK2512B0138AOver 51–136 MBH
4YDK2812B0160AOver 136–154 MBH
Y-j oi n t
Y-j oi n t
(high-pressure gas for heat recovery units)
Y-joint for outdoor unit4TDK3819B0000A456 MBH and below
High-pressure Y-joint for outdoor unit4TDK3100B0000A456 MBH and below
4YDK2815B0240AOver 154–240 MBH
4YDK3419B0336AOver 240–336 MBH
4YDK4119B0468AOver 336–461 MBH
4YDK4422B0999AOver 461 MBH
4YDK1500B0080A76 MBH and below
4YDK2500B0240AOver 76–240 MBH
4YDK3100B0468AOver 240–461 MBH
4YDK3800B0999AOver 461 MBH
VRF-SVN34A-EN11
Page 12
Preparing for Installation
Moving with a craneMoving with a forklift
Holes for wire cable
to pass through
Holes for inserting forklift
Wire cables
Holes for wire cable
to pass through
Spreader bars
Table 5. Optional accessories (continued)
AccessoryModel numberSpecification
Distribution header
Electronic expansion valve (EEV) kit
(a) Required for indoor units that do not have internal EEVs. Refer to the EEV kit installation guide (VRF-SVN43) for detailed
information.
Moving the Outdoor Unit
Follow these guidelines when moving the outdoor unit:
• Before moving the outdoor unit, determine a path that can support its weight.
• Do not lay the unit on its side and do tip it more than 30 degrees.
• Take care to avoid injury while moving the unit; the surface of the heat exchanger is sharp.
– If moving the unit with a crane, fasten the wire rope as shown in the figure below. To protect
damage or scratches to the unit, use a spreader bar.
– If moving the unit with a forklift, carefully insert forks into the forklift holes at the bottom of
the outdoor unit. Be careful with to avoid damaging the unit with the forklift.
(a)
4HJK2512B0159A154 MBH and below (for 4 rooms)
4HJK3115B0241A240 MBH and below (for 8 rooms)
4HJK3819B0998AOver 240 MBH (for 8 rooms)
4EEVEVA24SA000Below 12 MBH (for 1 indoor unit)
4EEVEVA32SA000Over 18 MBH (for 1 indoor unit
4EEVXDA24K132A
4EEVXDA24K200A
4EEVXDA32K200A17-31 MBH (for 2 indoor units)
4EEVXDA24K232A
4EEVXDA24K300A
4EEVXDA32K224A17-31 MBH (
4EEVXDA32K300A17-31 MBH (
7‐15.5MBH(for 2 indoor units )
7‐15.5MBH(for 2 indoor units)
7‐15.5MBH(for 3 indoor units)
7‐15.5MBH(for 3 indoor units)
for3indoorunits)
for3indoorunits)
12 VRF-SVN34A-EN
Page 13
Location Considerations
SeaSea
Sea
Sea breeze
Sea breeze
Protection wall
Sea breeze
ODU
ODU
ODU
ODU
ODU
Choose an installation location based on the following considerations.
•Install the outdoor unit:
– On a supporting structure that can bear the weight of the outdoor unit. The supporting
structure can be a base on the ground, on a waterproof roof, or in a pit.
– With sufficient clearances around the unit for service and repairs.
– On a flat surface that does not collect water
– In a well ventilated location
– Away from strong wind
– Away from direct exposure to rain or snow
– Where there is no risk of flammable gas leakage
– Where there is no exposure to salt, machine oil, sulfide gas, or corrosive environmental
conditions
– Away from sea breeze
Note: For seacoast applications, block the unit from direct exposure to sea breeze by installing
the outdoor unit (ODU) behind a structure (such as a building) or a protective wall that
is 1.5 times higher than the unit, leaving 28 in. (700 mm) of space between the wall and
unit for air circulation. Consult an installation expert about taking anti-corrosion
measures, such as removing salinity on the heat exchanger and applying a rust inhibitor
more frequently than once a year.
Preparing for Installation
– At least 9.84 ft (3 m) away from equipment that generates electromagnetic waves.
– Away from interfering sources, such as radio, computer, and stereo equipment.
– Far enough away from people living and working nearby so that hot discharge air or noise
do not disturb them.
– Away from inflammable materials.
•Ensure that condensate water generated by the outdoor unit can drain smoothly away from the
unit.
•Install the power and communication cables in a separately installed enclosure.
•If installing on a high place such as a roof, a fence or guard rail should be installed around it
to safeguard from falls.
•If there is a potential for accumulated snow to block the air inlet or heat exchanger, install the
unit on a base higher than the highest possible snow accumulation.
VRF-SVN34A-EN13
Page 14
Preparing for Installation
•R-410A refrigerant is a safe, nontoxic and nonflammable refrigerant. However, if there is a
concern about a dangerous level of refrigerant concentration in the case of refrigerant leakage,
add extra ventilation.
•Avoid installing the outdoor unit where corrosive gases, such as sulfur oxides, ammonia, and
sulfurous gas, are produced. If unavoidable, consult with an installation specialist about using
a corrosion-proof or anti-rust additive to protect the unit coils.
•Apply corrosion protection and any other protective coatings to the unit as appropriate to the
environment.
14 VRF-SVN34A-EN
Page 15
Unit Installation
Ground installation
Base installation: Surface of
base must be horizontally level
Raised base
8 in. (200 mm) min.
8 in. (200 mm)
Drain pit
Base
H-beam or vibration-isolation frame
8 in. (200 mm)
minimum
8 in. (200 mm)
minimum
2 in. (50 mm)
minimum
H-beam frame on concrete supports
Follow these guidelines for installing the outdoor unit.
Important: The manufacturer is not responsible for damage incurred for installations that have
not followed these guidelines.
The outdoor unit must be installed:
– On a horizontally level surface.
– On a surface that is strong enough to support the unit and to minimize noise.
Base Recommendations
A supporting base for the outdoor unit:
•Is typically made of concrete.
•Should typically be 1.5 times larger than the bottom of the outdoor unit. However, for
installations that are subject to snow accumulation, the base should be no larger than the
bottom of the unit.
•Should be 8 in. (200 mm) or higher to protect the outdoor unit from rain water or other
conditions that may cause damage to the unit.
Note: The height of the base or, if the unit is installed on a frame (see “Minimizing Vibration”
p. 15), the height of the base plus the frame should be greater than the highest expected
snowfall.
•If necessary, has wire mesh or steel bars added to the concrete to prevent damages or cracks.
Unit Installation
Minimizing Vibration
To minimize outdoor unit vibrations, use a vibration-minimizing structure such as an H-beam
frame, a vibration-isolation frame, or an isolation pad (thickness > 1 in. [20 mm]). The load-bearing
force of the structure must be 787 lbf (3.5 kN).
VRF-SVN34A-EN15
Page 16
Unit Installation
Vibration-isolation frame
Ensure that
bolts are loose.
37.80 (960)
39.92 (760)
3.94 (100)
3.94 (100)
X
B
A
X’
3.15 (80)
3.15 (80)
3.15 (80)
60°
1.97 (50)
5.91 (150)
3.94 (100)
3.94
(100)
Notes:
• Units: inch (mm)
• Refer to Tab l e 7 for A and B.
Drainage direction
(slope: 1/50)
X - X’ section
3.15 (80)
3.15 (80)
3.15 (80)
3.15 (80)
3.15 (80)
3.15 (80)
3.15 (80)
3.15 (80)
60°
60°
7.87
(200)
7.87
(200)
BB
Notes:
• Units: inch (mm)
•Refer to Ta b l e 7 for A and B.
Drainage direction
(slope: 1/50)
After installing a vibration-isolation frame, loosen the bolts so that the isolators are capable of
absorbing vibrations (refer to the figure below).
Water Management Recommendations
If the outdoor unit base is on ground level, construct a drainage pit around it to prevent the drain
water from collecting near the unit.
•Use wire mesh or steel bar for constructing the drainage pit.
•Construct the pit with a slope of 1:50.
Figure 6. Water management for single-unit installation
Figure 7. Water management for multiple-unit installation
16 VRF-SVN34A-EN
Page 17
Securing the Outdoor Unit
A
B
Isolation mounts:
4 holes, 0.71 (18)
Outdoor unit:
4 holes, 0.47 (12)
2.13 (54)
30.0 (761)
31.6 (803)
Notes:
•Units: inch (mm)
•Refer to Ta b l e 7 for A and B.
•
Refer to the blueprints in the
technical data book for hole
specifications for mounting.
a
b
c
m
Secure the outdoor unit firmly to the base with anchor bolts (see Figure 8 and Ta b le 6).
•Use zinc-plated or stainless steel nuts and bolts.
•It must be able to withstand the wind speed of 67 mph (30 m/s).
•Use a rubber washer between the bolt and the outdoor unit to prevent bimetallic corrosion.
•If you cannot attach the outdoor unit to the base, secure it from the side or to an additional
structure.
Figure 8. Bolt hole sizes and locations for mounting the outdoor unit
Unit Installation
Table 6. Anchor specification
Size
(m)
10 mm1/2 in. (14 mm)3 in. (75 mm)1-1/2 in. (40 mm)2 in. (50 mm)
Drill bit
diameter (a)
Anchor length
(b)
Sleeve length
(c)
Insertion depth
Fastening
265.5 in·lbf
Table 7.Unit and bolt dimensions
4TVH072*****
Dimensions
Unit width (A)37.01 in. (940 mm)53.15 in. (1350 mm)
Distance between bolts (B)29.13 in. (740 mm) 45.28 in. (1150 mm)
4TVR072*****
4TVH096/120/144*****
4TVR096/120/144*****
torque
(30 N·m)
VRF-SVN34A-EN17
Page 18
Unit Installation
Examples of condenser air discharge ducts
Discharge air
Discharge air
Suction air
Grille/louvers
Upper floor
Balcony
Mechanical room
Condenser Air Discharge Duct (optional)
CAUTION
Sharp Edges!
Working with galvanized sheet metal involves working with sharp edges. To avoid being cut,
technicians MUST put on all necessary Personal Protective Equipment (PPE), including gloves
and arm guards.
If you remove the fan guard to install the discharge duct, make sure to install a safety net on
the duct outlet to prevent foreign substances from entering the unit and to prevent the risk of
personal injury from sharp fan blades.
A discharge duct can be installed on the outdoor unit to prevent foreign substances from entering
the unit.
The static pressure of the discharge duct should be within the standard specification of 0.02 inches
of water (78.45 Pa) when installing the duct.
If it is difficult to provide a minimum of 6.56 ft (2 m) of space between the air outlet and nearby
obstacles, direct the discharge air horizontally from the fan.
18 VRF-SVN34A-EN
Page 19
Wind/Snow Prevention Duct Installation (optional)
A wind/snow prevention should be installed:
•In snowy regions, to prevent snow from accumulating on the outdoor unit and the risk of
accumulated frost, which may interfere with normal heating operation.
•In windy regions, such as near a sea shore, to protect the unit from humid air.
Install the duct so that:
•The discharge air and prevailing wind are not going the same direction.
•The discharge air is not directed to the enclosed area.
•Height (h) of the frame or base should be higher than the heaviest expected snowfall.
Unit Installation
VRF-SVN34A-EN19
Page 20
Refrigerant Piping
A(2)
B
C
A(3)
A(1)
D
E
F
10 ton10 ton
8 ton
8 ton
Outdoor
unit
capacity
(ton)
Pipe A
Pipe size (OD)
Liquid
in. (mm)
Gas
in. (mm)
10A(1)1/2 (12.70)1-1/8 (28.58)
18A(2)5/8 (15.88)1-1/8 (28.58)
26A(3)3/4 (19.05)1-3/8 (34.92)
Key
A(1): Select based on individual outdoor unit capacity (Table 8, p. 21).
A(2): Select based on the sum of outdoor unit capacity behind the first outdoor unit multi-connection (Tab l e 8 , p. 2 1 ).
A(3): Select based on the sum of outdoor unit capacity before the first branch joint (Table 8, p. 21).
B: Pipes between branch joints (Tab l e 9 , p . 2 1)
C: Outdoor joints between outdoor units (Table 14, p. 24)
D: First branch joint (Table 15, p. 24))
E: Branch joints to indoor units (Table 16, p. 25))
F: Pipe size between branch joints and indoor units (Table 13, p. 24)
Refrigerant Piping
This section contains information on selecting, storing, and connecting refrigerant piping.
Selecting Refrigerant Piping
Refrigerant piping diameter, thickness, and temper is selected according to length, as specified in
this section.
Notes:
• Use insulated, unwelded, degreased, and deoxidized copper pipe (Cu-DHP type according
to ISO 1337 or UNI EN 12735-1) suitable for an operating pressure of at least 609.15 psi
(4200 kPa) and a burst pressure of at least 3002.28 psi (20,700 kPa). Copper pipe for hydrosanitary applications is unsuitable.
• If there is a risk of decreased performance caused by pipe length, use piping that is one
size larger than that specified in this section.
Heat Pump Applications
The example in Figure 9 shows a 26-ton capacity heat pump system with pipe diameters specified.
Figure 9. Heat pump system example
20 VRF-SVN34A-EN
Page 21
Use Tab le 8 to determine the size of the main pipes based on pipe length. (Refer to A in Figure 13,
p. 32)
Table 8. Outdoor unit main pipe size based on pipe length (A)
(a) If 1 (25.4) pipe is not available on site, use 1 1/8 (28.58) pipe.
(b) If 1-1/4(31.75) pipe is not available on site, use 1 3/8 (34.92) pipe.
(c) If 1-1/2 (38.1) pipe is not available on site, use 1 5/8 (41.28) pipe.
Main pipe size (OD)
Liquid
in. (mm)
Gas
in. (mm)
when pipe length > 295.3 ft (90 m)
Main pipe size (OD)
Liquid
in. (mm)
in. (mm)
Gas
(a)
(b)
(b)
(b)
(b)
(b)
(c)
(c)
(c)
(c)
Use Ta b le 9 to determine the size of pipes between branch joints. (Refer to B in Figure 13, p. 32.)
Table 9. Pipe size between branch joints (B)
Branch pipe size (OD) when pipe is
Indoor unit
total capacity
(MBH)
Less than 513/8 (9.52)5/8 (15.88)1/2 (12.70)3/4 (19.05)
(a) If 1 (25.4) pipe is not available on site, use 1-1/8 (28.58) pipe.
(b) If 1-1/4 (31.75) pipe is not available on site, use 1-3/8 (34.92) pipe.
(c) If 1-1/2 (38.1) pipe is not available on site, use 1-5/8 (41.28) pipe.
147.6 ft (45 m)
Liquid
in. (mm)
Gas
in. (mm)
VRF-SVN34A-EN21
Branch pipe size (OD) when pipe is
147.6–295.3 ft (45–90 m)
Liquid
in. (mm)
Gas
in. (mm)
(a)
(b)
(b)
(c)
Page 22
Refrigerant Piping
A(2)
B
C
A(3)
A(1)
D
E
F
10 ton10 ton
8 ton
8 ton
Outdoor
unit
capacity
(ton)
Pipe A
Pipe size (OD)
Liquid
in. (mm)
Gas
in. (mm)
High-
pressure
gas
in. (mm)
10A(1)1/2 (12.70) 1-1/8 (28.58) 7/8 (22.22)
18A(2)5/8 (15.88) 1-1/8 (28.58) 1-1/8 (28.58)
26A(3)3/4 (19.05) 1-3/8 (34.92) 1-1/8 (28.58)
Key
A(1): Select based on individual outdoor unit capacity (Table 11, p. 23).
A(2): Select based on the sum of outdoor unit capacity behind the first outdoor unit multi-connection (Table 11, p. 23).
A(3): Select based on the sum of outdoor unit capacity before the first branch joint (Table 11, p. 23).
B: Pipes between branch joints (Table 12, p. 23)
C: Outdoor joints between outdoor units (Table 14, p. 24)
D: First branch joint (Table 15, p. 24))
E: Branch joints to indoor units (Table 16, p. 25))
F: Pipes between branch joints and indoor units (Table 13, p. 24)
Use Tab l e 1 0 to determine the size for pipes between branch joints and indoor units. (Refer to F in
Figure 13, p. 32.)
Table 10. Pipe size between the branch joint and indoor unit (F)
Indoor unit capacity
(MBH)
Less than 201/4 (6.35)1/2 (12.70)
24-523/8 (9.52)5/8 (15.88)
68–783/8 (9.52)3/4 (19.05)
78–963/8 (9.52)7/8 (22.22)
Heat Recovery Applications
The example in Figure 10 shows a 26-ton capacity heat recovery system with pipe diameters
specified.
Figure 10. Heat recovery system example
Liquid
in. (mm)
Pipe size (OD)
Gas
in. (mm)
22 VRF-SVN34A-EN
Page 23
Use Ta b le 11 to determine the size of the main pipes (A in Figure 10, p. 22) based on pipe length.
Table 11. Outdoor unit main pipe size based on pipe length (A)
(a) Increase the liquid pipe by one size if the pipe length > 295.3 ft (90 m), as specified in this column.
in. (mm)
Gas
in. (mm)
pressure gas
in. (mm)
Liquid
in. (mm)
Main pipe size (OD)
(a)
Gas
in. (mm)
Use Tab l e 1 2 to determine the size of pipes between branch joints. (Refer to B in Figure 10, p. 22.)
High-
pressure gas
in. (mm)
Table 12. Pipe size between branch joints (B)
Indoor unit total
capacity
(MBH)
Less than 513/8 (9.52)5/8 (15.88)5/8 (15.88)
51-75.93/8 (9.52)3/4 (19.05)5/8 (15.88)
76-95.93/8 (9.52)7/8 (22.22)3/4 (19.05)
96-114.91/2 (12.70)1-1/8 (28.58)3/4 (19.05)
115-153.91/2 (12.70)1-1/8 (28.58)1-1/8 (28.58)
154–171.95/8 (15.88)1-1/8 (28.58)1-1/8 (28.58)
172-239.95/8 (15.88)1-1/8 (28.58)1-1/8 (28.58)
240-335.93/4 (19.05)1-3/8 (34.92)1-1/8 (28.58)
336–359.93/4 (19.05)1-5/8 (41.28)1-1/8 (28.58)
360–460.93/4 (19.05)1 5/8 (41.28)1-3/8 (34.92)
461–5773/4 (19.05)1 5/8 (41.28)1-3/8 (34.92)
Liquid
in. (mm)
VRF-SVN34A-EN23
Branch pipe size (OD)
Gas
in. (mm)
High-pressure gas
in. (mm)
Page 24
Refrigerant Piping
Use Tab l e 13 to determine the size for the pipes between branch joints and indoor units. (Refer to
F in Figure 10, p. 22.)
Table 13. Pipe size between the branch joint and indoor unit (F)
Indoor unit capacity (MBH)
Identifying Branch Joints
Use Ta b le 14 , Tab l e 15 , and Ta bl e 16 to identify branch joint models.
Note: High-pressure Y-joints are for heat recovery outdoor unit models only, as noted in each
table.
Table 14. Branch joint between outdoor units (C)
Pipe size (OD)
Liquid
in. (mm)
Less than 201/4 (6.35)1/2 (12.70)
24-523/8 (9.52)5/8 (15.88)
68–783/8 (9.52)3/4 (19.05)
78–963/8 (9.52)7/8 (22.22)
Gas
in. (mm)
Branch joint between outdoor units (C)Model
Y-joint 4TDK3819B0000A
High-pressure gas Y-joint (for heat recovery models)4TDK3100B0000A
Use Ta b le 15 to select the first branch joint according to outdoor unit capacity. (Refer to D in
Figure 9, p. 20 (heat pump) or Figure 10, p. 22 (heat recovery.)
Table 15. First branch joint according to outdoor unit capacity (D)
Outdoor unit
capacity
First branch joint (D)
Y-j o int
High-pressure gas Y-joint (for heat recovery models)
(ton)
6, 8, 104YDK2512B0138A
124YDK2812B0160A
14, 16, 18, 204YDK2815B0240A
22, 24, 26, 284YDK3419B0336A
30, 32, 34, 364YDK4119B0468A
64YDK1500B0080A
8–204YDK2500B0240A
22–364YDK3100B0468A
Model
24 VRF-SVN34A-EN
Page 25
Use Ta b le 16 to select the branch joints connected after the first branch, according to the total
capacity of all indoor units connected after the branch. (Refer to E in Figure 9, p. 20 (heat pump) or
Figure 10, p. 22 (heat recovery).)
Table 16. Branch joints connected after the first branch, according to total indoor unit capacity (E)
Total indoor unit
Branch joints after the first branch (E)
Y-j o int
High-pressure gas Y-joint (for heat recovery models)
capacity (MBH)
Less than 514YDK1509B0051A
51—135.94YDK2512B0138A
136—153.94YDK2812B0160A
154—239.94YDK2815B0240A
240—335.94YDK3419B0336A
336—460.94YDK4119B0468A
461 and over4YDK4422B0999A
Less than 764YDK1500B0080A
76—239.94YDK2500B0240A
240—4614YDK3100B0468A
Pipe Minimum Thickness and Temper Grade Based on Pipe Size
Ta b le 17 specifies thickness and temper grade based on pipe diameter.
Refrigerant Piping
Model
CAUTION
Risk of Pipes Breaking!
If pipes with a diameter larger than 3/4 in. (19.05 mm) are specified, use semi-hard (C1220T1/2H) or hard (C1220T-H) copper piping. If a softer copper pipe (C1220T-O) is used, the pipe may
break due to its low pressure resistance and cause personal injury.
Table 17. Refrigerant pipe minimum thickness and temper grade
Outer diameter
in. (mm)
1/4 (6.35)0.028 (0.70)
3/8 (9.52)0.028 (0.70)
1/2 (12.70) 0.031 (0.80)
5/8 (15.88) 0.039 (1.00)
3/4 (19.05)0.035 (0.9)
7/8 (22.22)0.035 (0.9)
1 (25.40) 0.039 (1.0)
1-1/8 (28.58)0.043 (1.1)
1-1/4 (31.75)0.043 (1.1)
1-3/8 (34.92)0.048 (1.35)
1-1/2 (38.10) 0.053 (2.0)
1-5/8 (41.28)0.056 (1.43)
1-3/4 (44.45) 0.063 (2.10)
2 (50.80)0.079 (2.00)
2-1/8 (53.98)0.083 (2.10)
Minimum thickness
in. (mm)
Temper grade
Annealed
(C1220T-O)
Drawn
(C1220T-1/2H or C1220T-H)
VRF-SVN34A-EN25
Page 26
Refrigerant Piping
Storing Refrigerant Piping
To prevent foreign materials or water from entering the pipe, storing method and sealing method
(especially during installation) is very important. Apply correct sealing method depending on the
environment (see Tab l e 1 8 ).
Table 18. Refrigerant pipe storage factors
Storage location
Outdoor
Indoor—Taping
Evacuating Refrigerant
The outdoor unit ships with the following amount of refrigerant. Evacuate the unit of all ship-with
refrigerant before installing refrigerant piping.
6 ton unit8 ton unit10 ton unit12 ton unit
12.1 lbs16.3 lbs16.3 lbs19.2 lbs
Installing Refrigerant Piping
Hazard of Explosion and Deadly Gases!
Failure to follow all proper safe refrigerant handling practices could result in death or serious
injury. Never solder, braze or weld on refrigerant lines or any unit components that are above
atmospheric pressure or where refrigerant may be present. Always remove refrigerant by
following the guidelines established by the EPA Federal Clean Air Act or other state or local
codes as appropriate. After refrigerant removal, use dry nitrogen to bring system back to
atmospheric pressure before opening system for repairs. Mixtures of refrigerants and air under
pressure may become combustible in the presence of an ignition source leading to an
explosion. Excessive heat from soldering, brazing or welding with refrigerant vapors present
can form highly toxic gases and extremely corrosive acids.
Storage
Longer than one
Shorter than one
Ship-with refrigerant amount by unit type
time
month
monthTaping
WARNI NG
Sealing
Pipe
pinch
type
NOTICE:
System Component Damage!
Do not remove the seal caps from refrigerant connections, or open the service valves until
prepared to braze refrigerant lines to the connections. Excessive exposure to atmosphere (> 5
min.) may allow moisture or dirt to contaminate the system, damaging valve seals and causing
ice formation in system components.
Overview
1. Cut or extend field-supplied piping as needed. To extend pipes, braze or using flared pipe
connections (not supplied). Refer to
p. 27, and “Flared Pipe Connections” p. 28.)
2. Make sure that pipes are free of dirt, debris, and moisture, and do not leak. (Refer to “Leak
Testing Pipe Connections” p. 45).
26 VRF-SVN34A-EN
“Pipe Cutting” p. 27, “Nitrogen Flushing While Brazing”
Page 27
3. Braze or use flared pipe connections to install piping. Refer to “Connecting Piping to the
Correct: 90º
Oblique
Rough
Burr
Flowmeter
Pressure regulator
Stop valve
Nitrogen
Nitrogen
Outdoor Unit” p. 29) and to “Connecting Branch Joints” p. 30.
Pipe Cutting
Required tools:
•Pipe cutter
•Reamer
•Pipe holder
1. Using a pipe cutter, cut the pipe so that the cut edge is at 90° to the side of the pipe.
2. Use a reamer to remove all burrs at the cut edge.
See examples of correctly and incorrectly cut pipes.
Nitrogen Flushing While Brazing
Refrigerant Piping
NOTICE
Avoid Unit Damage!
Never braze pipe connections without performing nitrogen flushing. Failure to perform this
procedure will damage the unit, resulting in capacity loss and reduced long-term reliability.
While brazing refrigerant pipes, flush them with nitrogen gas. Use a pressure regulator to maintain
a flow rate of 1.76 ft3/h (0.05 m3/h) or more.
Figure 11. Nitrogen flushing while brazing refrigerant pipes
VRF-SVN34A-EN27
Page 28
Refrigerant Piping
Length of pipe extending above flare bar
Pipe
Flaring
bar
Yok e
Flaring bar
Copper pipe
Flare nut
Inclined
Damaged
surface
Uneven
thickness
Correct
Cracked
Flared Pipe Connections
Clutch type and wing nut type flare tools are available for flared pipe connections.
1. Slide the flare nut over the pipe to be flared.
2. Slide the end of the pipe into the hole on the flaring bar that fits the pipe, leaving a length of
pipe, determined by tool type (see table), extending above the flaring bar. Clamp it down.
R-410A clutch type
Clutch typeWing nut type
Conventional flare tool
0–0.020 in.0.04–0.06 in.0.06–0.08 in.
3. Attach the yoke to the flaring bar, centering the conical part over the end of the pipe that is
extending above the flaring bar.
4. Tighten the yoke securely to flare the end of the pipe.
5. Remove the pipe. The end of the pipe that you flared should look like the end of a trumpet. See
examples of correctly and incorrectly flared pipes.
28 VRF-SVN34A-EN
Page 29
Refrigerant Piping
R.016–.031
45°±2°
90°±2°
Left side
Right side
Front side
Pipe connections
Heat pump
Heat recovery
6. Align the pipes and tighten the flare nuts manually and then with a spanner torque wrench,
applying the torque according to pipe dimensions:
Outer diameter
in. (mm)
1/4 (6.35)10.3–13.3 ft·lb0.34–0.36
3/8 (9.52)25.1–31.0 ft·lb0.50–0.52
1/2 (12.70)36.1–45.0 ft·lb0.64–0.65
5/8 (15.88)50.2–60.5 ft·lb0.76–0.78
Connection
torque (ft·lb)
Connecting Piping to the Outdoor Unit
Important: Ensure that all pipe connections are accessible for servicing and maintenance.
Pipes can be connected to the outdoor unit at the front, bottom left, or bottom right of the unit, as
shown in the following figure:
Flare dimension
(in.)
Flare shape (in.)
VRF-SVN34A-EN29
1. Remove the pipe cover from the outdoor unit.
2. Remove knock-outs from only the holes that you are going to use. Unused holes should remain
closed to prevent damage to the unit.
• Take care to prevent damage to the exterior of the unit.
• Remove burrs from knock-out hole edges and apply rust inhibitor.
3. Connect the pipes to the outdoor unit using flared connections or by brazing. If brazing the pipe
connection, avoid damaging the service valve by wrapping it with a wet cloth as shown in
Figure 12, p. 30.
• Avoid damaging the temperature sensor.
• Ensure that the connected pipes do not touch each other or make contact with the unit.
4. After making electrical connections (see “Electrical Wiring” p. 37) and insulating the pipes (see
“Insulating Refrigerant Pipes” p. 48), replace the pipe cover and close the remaining gap.
Page 30
Refrigerant Piping
Damp towel
Damp towel
Branch joint should be
connected at the same or lower
level as the refrigerant pipes
leaving the outdoor unit.
Unit straight section should
be 12 in. (300 mm)
Figure 12. Protecting the unit and temperature sensor while brazing the pipe connection
Connecting Branch Joints
Important: Ensure that all pipe connections are accessible for servicing and maintenance. For
optimal refrigerant distribution, use only factory joints.
Install outdoor joints as needed to connect multiple outdoor units to one another and Y-joints
connect the outdoor unit(s) to indoor units. See the branch joint installation manual (VRF-SVN41)
for details.
Note: Outdoor units can be installed in any order.
Table 19. Connecting outdoor units with branch joints
Correct installationIncorrect installation
Refrigerant pipes must be connected in parallel with the unit.
30 VRF-SVN34A-EN
Page 31
Table 19. Connecting outdoor units with branch joints (continued)
8–12 in. (200–300 mm)
6.56 ft (2 m)
3.3 ft (1 m)
If the piping length between the outdoor
unit and the branch joint exceeds 6.56 ft
(2 m), install a vertical trap that is 8–12 in.
(200-300 mm) high.
Correct installationIncorrect installation
Branch joints between outdoor units must be installed horizontally.
r ≤ 33 ft (10 m), s ≤ 33 ft (10 m), t ≤ 33 ft (10 m)
H1 ≤ 164/131 ft (50/40 m)
Required conditions must be satisfied (see Table 21,
p. 35)
Notes/Examples
a+b+c+d+e+f+g+p ≤656
[722] ft
(200 [220] m)
a+i ≤ 656 [722] ft
(200 [220] m)
a+b+h ≤ 656 [722] ft (200
[220] m
a+i+k ≤ 656 [722] ft (200
[220] m
a+b+c+d+e+f+g+p+h+i
≤3281 ft (1000 m)
For 1 indoor unit
For 2 indoor units
For 3 indoor units
Piping location
Actual length
[equivalent length]
Outdoor unit to
Maximum
allowable piping
length
Maximum
allowable piping
height difference
Maximum length
after branch joint
Electronic
expansion valve
(EEV) kit
(a) Equivalent length Y-joint: 1.64 ft (0.5 m); distribution header: 3.28 ft (1 m).
(b) If the indoor unit is at a higher level than outdoor unit, the allowable height difference is 131 ft (40 m). If the indoor unit is located at a lower level than
(c) Required for indoor units that do not have internal EEVs. Refer to the EEV kit installation guide (VRF-SVN43) for detailed information.
(c)
the outdoor unit, the allowable height difference is 361 ft (110 m). If the height difference exceeds 164 ft (50 m), request engineering support from Trane.
indoor unit
Between outdoor
units (module
installation)
Outdoor unit to
indoor unit
Indoor unit to indoor
unit
First branch joint to
farthest indoor unit
Actual piping length
Total piping length
piping length
Equivalent lengthr ≤ 43 ft (13 m), s ≤ 43 ft (13 m), t ≤ 43 ft (13 m)
361/131 ft (110/40 m)
164 ft (50 m) or lessH2 ≤ 164 ft (50 m)
piping length
6.6 ft (2 m) or less
66 ft (20 m) or less
34 VRF-SVN34A-EN
Page 35
Table 21. Required condition (note toTable 20, p. 34)
4MCUCUY4NCE000
4MCUCUY4NCE000
4MCUCUY4NCE000
4MCUCUY4NCE000
4MCUCUY4NCE000
4MCUCUY4NCE000
ConditionExample
First branch joint to
farthest indoor unit
Total length of
extended pipe
Each Y-joint to
each indoor unit
Difference between [the distance of the outdoor unit to the farthest indoor unit] and the
nearest indoor unit and ≤148 ft (45 m), (a+b+c+d+e+g+p) ≤ 148 ft (45 m)
148 ft (45 m) ≤ b+c+d+e+f+g+p ≤ 295 ft (90 m): branch pipes (b,
c, d, e, f, g) size must be increased by 1 size
If the size of the pipe between the first branch joint and the outdoor
unit is not increased by 1 size,
a+(b+c+d+e+f+g)x2+h+i+k+l+m+n+p ≤ 3281 ft (1000 m)
If the size of the pipe between the first branch joint and the outdoor
unit is increased by 1 size, a+(b+c+d+e+f+g)x2+h+i+k+l+m+n+p
> 3281 ft (1000 m)
Figure 19. Installation with Y-joints: Heat recovery
Refrigerant Piping
Figure 20. Installation with MCU: Heat recovery
VRF-SVN34A-EN35
Page 36
Refrigerant Piping
Figure 21. Installation with MCU and Y-joint: Heat recovery
Table 22. Maximum allowable refrigerant piping length and height differences for heat recovery installations
Piping length and height
Piping location
Piping [equivalent
Outdoor unit to indoor
Maximum
allowable
piping
length
Maximum
allowable
piping
height
difference
Maximum
allowable
length after
branch joint
Electronic
expansion
valve (EEV)
(c)
kit
(a) Equivalent piping length—Y-joint: 1.64 ft (0.5 m); distribution header: 3.28 ft (1 m); MCU: 3.28 ft (1 m).
(b) If the indoor unit is at a higher level than outdoor unit, the allowable height difference is 131 ft (40 m). If the indoor unit is located at a lower level than
the outdoor unit, the allowable height difference is 361 ft (110 m). If the height difference exceeds 164 ft (50 m), request engineering support from Trane.
(c) Required for indoor units that do not have built-in EEVs. Refer to the EEV kit installation guide (VRF-SVN43) for detailed information.
unit
Between outdoor
units (module
installation)
Outdoor unit to indoor
unit
Indoor unit to indoor
unit
MCU to MCU49 ft (15 m)H4 ≤ 49 ft (15 m)
First branch joint to
farthest indoor unit
Indoor unit
length]
Total piping length 3281 ft (1000 m)
Piping length33 ft (10 m)r ≤ 33 ft (10 m), s ≤ 33 ft (10 m), t ≤ 33 ft (10 m)
Equivalent piping
length
Piping
Actual piping
length
differences
(a)
Notes/Examples
656 [722] ft
(200 [220] m)
43 ft (13 m)r ≤ 43 ft (13 m), s ≤ 43 ft (13 m), t ≤ 43 ft (13 m)
Observe the following precautions when making electrical connections.
Hazardous Voltage!
Disconnect all electric power, including remote disconnects before servicing. Follow proper
lockout/tagout procedures to ensure the power can not be inadvertently energized. Failure to
disconnect power before servicing could result in death or serious injury.
Use Copper Conductors Only!
Unit terminals are not designed to accept other types of conductors. Failure to use copper
conductors could result in equipment damage.
•Make all electrical connections in accordance with electrical codes and ordinances.
•Multi-pole circuit breaker or disconnect is required to fully isolate the unit from all power.
•Install circuit breakers/disconnects in accordance with local and national codes.
•Select the power cable in accordance with relevant local and national regulations.
•Power cable specifications are based on the following conditions: underground/ambient
temperature of 86ºF (30ºC), single multi-conductor cables.
Note: If conditions are different from these, consult an electrical installation expert and re-
•Use a power cable made out of incombustible material for the insulator (inner cover) and the
sheath (outer cover).
•All wiring must be protected from weather and damage.
•Do not use power cable that has exposed wire.
•Do not disconnect or change the factory wiring inside the unit.
•Provide strain relief for power and communication cables.
•Unbalanced power must be maintained within 10% of supply rating among all indoor units or
the unit will stop and an error code will be generated. (Significantly unbalanced power may
shorten the life of the system.)
•Maintain a distance of 2 in. (50 mm) or more between power and communication cables to
prevent interference.
Electrical Wiring
WARNI NG
NOTICE
select the power cable. If the length of power cable exceeds 164.04 ft (50 m), re-select
the power cable considering the voltage drop.
VRF-SVN34A-EN37
Page 38
Electrical Wiring
Outdoor unit (main)Outdoor unit (sub)
Ground
Power cable
Power cable
Power cable
Communication
cable between
outdoor units
Communication between
outdoor units
circuit
breaker or
disconnect
Communication between
Ground
Ground
outdoor and indoor units
Communication between
outdoor and indoor units
Power cable
Indoor unit
Indoor unit
Indoor unit
Ground
Ground
Ground
Outdoor unit (sub)
circuit
breaker or
disconnect
circuit
breaker or
disconnect
circuit
breaker or
disconnect
Wired
remote
controller
Wired
remote
controller
Wired
remote
controller
See Figure 23,
p. 40 for details
Notes:
• Remove burrs from the knock-out hole.
• Use cable conduit and bushing to prevent cables from being damaged when passing
through the knock-out holes.
• Apply rust-resistant paint around the knock-out hole.
Figure 22. Typical system installation wiring
Detail of cable knock-outs
Communication cable
Power cable
Ground cable
38 VRF-SVN34A-EN
Page 39
Power Wiring
Electrical Wiring
WARNI NG
Avoid Risk of Fire or Explosion!
Do not let the power cable come into contact with the pipes inside the outdoor unit. If the
power supply cable touches the pipes, the vibration of the compressor will be transferred to
the pipes and can damage the power supply cables or pipes. The damage could result in fire or
explosion, causing death or serious injury.
Follow this procedure:
1. Re f er to Table 24 and Table 25, p. 41 for power cable and circuit breaker specifications. Refer to
Table 23, p. 39 for conduit specifications.
2. Cut the power cable to an appropriate length and connect it to the terminals in the power supply
box with a solderless ring terminal (see Figure 23, p. 40).
ScrewTightening torque for terminalPower cable
M40.9–1.1 lbf/ft (1.2–1.5 N.m) Single-phase 208-230 V/460 V power cable
M84.1–5.4 lbf/ft (5.5–7.3 N.m) Three-phase 208-230 V/460 V power cable
3. If two cables are connected to one terminal, place the cables back to back with the thin cable
upward and the thick cable downward, as shown in the detail in
Figure 23.
4. Secure the cable(s) with a cable tie and provide strain relief.
5. Replace the cover on the terminal board.
Note: Make sure that the section of the power supply cable that has the sheath removed is
inside the power supply box. If this is not possible, connect the power cable conduit to
the power supply box.
Table 23. Cable conduit specifications
NameTemper gradeApplication conditions
Flexible PVC conduitPVC
Class 1 flexible conduitGalvanized steel sheet
Class 1 PVC-coated flexible
conduit
Galvanized steel sheet and
soft PVC compound
If conduit is installed indoors and not exposed to outside
elements (embedded in concrete)
If conduit is installed indoors but exposed to outside
elements
If conduit is installed outdoors and requires waterproofing
6. Pull the power cable through the designated knock-out at the bottom right of the outdoor unit
Figure 22, p. 38 for details).
(see
VRF-SVN34A-EN39
Page 40
Electrical Wiring
Figure 23. Power wiring connections
Power terminal location
Detail for connecting
two cables to one terminal
Solderless
ring terminal
Cable tie
Thick cable
Thin cable
40 VRF-SVN34A-EN
Page 41
Electrical Wiring
Table 24. Circuit breaker and power cable specifications—Heat pump/heat recovery: 208–230 V
Module 1Module 2Module 3
Power
Units
Capacity
6 ton 4TV*072B300NB 60 208/230 14.34.028.0 35
8 ton 4TV*0096B300NB 60 208/230 12.512.53.0 3.0 37.8 50
10 ton 4TV*0120B300NB 60 208/230 14.814.83.0 3.0 43.0 50
12 ton 4TV*0144B300NB 60 208/230 17.417.43.0 3.0 52.6 70
14 ton 4TV*0168B300NB 60 208/230 14.34.028.0 3512.512.53.0 3.0 37.8 50
16 ton 4TV*0192B300NB 60 208/230 14.34.028.0 3514.814.83.0 3.0 43.0 50
18 ton 4TV*0216B300NB 60 208/230 14.34.028.0 3517.417.43.0 3.0 52.6 70
Exclusive grounding terminal
(attached to a structure)
Grounding at the
electrical panel
Grounding
Important: Grounding must be done by a qualified electrician.
1. Select rated grounding cable by referring to the outdoor unit power cable specifications
(Table 24, p. 41 and Table 25, p. 41).
2. Connect the grounding cable to the grounding hole inside the power supply box and pull it
through the designated grounding knock-out (see Figure 24 for details).
Figure 24. Grounding cable connection location
Table 26. Grounding resistance requirements
Power condition at
installation site
Voltage to ground is ≤ 150 V
Voltage to ground is > 150 V
• Ensure that the grounding resistance is <100 .
• If a circuit breaker is installed that disconnects the
circuit within 0.5 seconds, the allowable grounding
resistance is 30–500 .
High or average humidityLow humidity
• Ideally, grounding resistance should be <100 and
should not exceed 250 .
• Ensure that the grounding resistance is <100 .
• If a circuit breaker is installed that disconnects the
circuit within 0.5 seconds, the allowable grounding
resistance is 30–500 .
Figure 25. Outdoor unit grounding examples
42 VRF-SVN34A-EN
Page 43
Communications Wiring
F1Communication
between outdoor
and indoor units
F2
OF1 Communication
between outdoor
units
OF2
R1
Higher-level
controls
R2
Terminal identification
Communication wiring
terminals
Hazardous Voltage!
Disconnect all electric power, including remote disconnects before servicing. Follow proper
lockout/tagout procedures to ensure the power can not be inadvertently energized. Failure to
disconnect power before servicing could result in death or serious injury.
Connect the communications wiring as shown in Figure 26.
•Refer to Ta bl e 23, p. 39 for conduit specifications.
•Refer to BAS-SVX51 for communication wiring specifications and best practices.
Notes:
• Ensure that more than 1 in. (20 mm) of the outer sheath of the power and communication
cable conduit are inside the electrical component box.
• To reduce interference, ensure that power and communication cables run in parallel or,
if crossing is necessary, cross at 90 degrees.
• The communication cable between outdoor units and between indoor and outdoor units
has no polarity.
Electrical Wiring
WARNI NG
Figure 26. Communications board and wiring terminals
VRF-SVN34A-EN43
Page 44
Electrical Wiring
Communications clamping location
To provide strain relief, secure the communications cable with a clamp in the location shown in
Figure 27.
Figure 27. Communications cable clamping location
Pull the communications cable through the designated knock-out at the bottom right of the outdoor
unit (see Figure 22, p. 38 for details).
44 VRF-SVN34A-EN
Page 45
Leak Testing Pipe Connections
Before leak testing pipe connections, read all safety precautions and notes.
Confined Space Hazards!
Do not work in confined spaces where refrigerant or other hazardous, toxic or flammable gas
may be leaking. Refrigerant or other gases could displace available oxygen to breathe, causing
possible asphyxiation or other serious health risks. Some gases may be flammable and or
explosive. If a leak in such spaces is detected, evacuate the area immediately and contact the
proper rescue or response authority. Failure to take appropriate precautions or to react properly
to such potential hazards could result in death or serious injury.
Explosion Hazard!
Never use an open flame to detect gas leaks. It could result in an explosion. Use a leak test
solution for leak testing. Failure to follow recommended safe leak test procedures could result
in death or serious injury or equipment or property-only-damage.
Use only dry nitrogen with a pressure regulator for pressurizing unit. Do not use acetylene,
oxygen or compressed air or mixtures containing them for pressure testing. Do not use
mixtures of a hydrogen containing refrigerant and air above atmospheric pressure for pressure
testing as they may become flammable and could result in an explosion. Refrigerant, when
used as a trace gas should only be mixed with dry nitrogen for pressurizing units. Failure to
follow these recommendations could result in death or serious injury or equipment or
property-only damage.
Do not exceed unit nameplate design pressures when leak testing system. Failure to follow
these instructions could result in an explosion causing death or serious injury.
Leak Testing Pipe Connections
WARNI NG
WARNI NG
NOTICE
Refrigerant Pipe Damage!
When performing a leak test, use a pressure regulator to prevent an excess amount of nitrogen
(over 594.6 psi [4.1 MPa]) from entering the pipes. If the pipe is filled with over the specified
amount of nitrogen in a short time, pipes may be damaged.
Notes:
• All required piping pressure tests must be completed in accordance with national and/or
local codes.
• When leak-testing refrigerant systems, observe all safety precautions.
• Leak test only one circuit at a time to minimize system exposure to potentially harmful
moisture in the air.
• Use R-410A refrigerant gas as a tracer for leak detection and use oil-pumped dry nitrogen
to develop required test pressures.
• Use tools for R-410A to prevent the inflow of foreign substances and reduce the risk of
high pressure.
• Do not remove the valve core of the charging port.
• Perform the leak test with the service valve of the outdoor unit closed.
VRF-SVN34A-EN45
Page 46
Leak Testing Pipe Connections
Low-pressure side
Nitrogen
Heat pump
Heat recovery
Nitrogen
High-pressure side
Filling ports
Gas pipe
Liquid pipe
Service valves
High-pressure gas pipe
Filling ports
Service valves
Gas pipe
Liquid pipe
Low-
pressure
side
Highpressure
side
Use the following procedure for leak testing pipe connections. Refer to Figure 28.
Figure 28. Leak testing pipe connections
1. Apply pressure to the liquid side pipe and gas side pipe (when installing outdoor units in
module) with nitrogen gas at 4.1 MPa (594.6 psi).
2. Keep it for minimum 24 hours to check if pressure drops. After applying nitrogen gas, check for
a change in pressure, using a pressure regulator.
3. If the pressure drops, check for gas leakage. If the pressure is changed, apply soap water to
check for leakage and check the pressure of the nitrogen gas again.
4. Maintain 145 psi (1.0 MPa) of the pressure before performing vacuum drying and check for
further gas leakage. After checking the first gas leakage, maintain 145 psi (1.0 MPa) to check for
further gas leakage.
46 VRF-SVN34A-EN
Page 47
Vacuum Procedure for the System
Perform vacuum drying of the
liquid side pipe and gas side
pipe (when installing outdoor
units in module) using a vacuum
pump.
Make sure that check valve is installed to prevent pump oil from
flowing into the pipe.
While the vacuum gauge
pressure is less than 29.7 inWC,
perform the vacuum
drying for more than 1 hour and
close the valve.
Vacuum pressure must be checked with the vacuum gauge.
After vacuum pump stops,
check whether the pressure is
maintained within 29. 7 inWC
for an hour.
Charge additional refrigerant to the
pipe
No
Perform vacuum drying again
Check for gas leakage
Vacuum destruction
Apply nitrogen gas to the pipe at
pressure of 7.25 psi (0.05 MPa).
Yes
No
Over 29.7 inWC
Pressure increase
Yes
After performing a leak test, follow this vacuum procedure:
•Use tools for R-410A to prevent the inflow of foreign substances and resist against internal
pressure.
•Use a vacuum pump that allows vacuuming under 29.7 inH2O.
•Use a vacuum pump with a check valve to prevent pump oil from flowing backward while the
vacuum pump is stopped.
•Completely close the liquid-gas side service valve of the outdoor unit.
Connect the manifold gauge to
the liquid side pipe and gas side
pipe (when installing outdoor
units in module).
When installing outdoor units in module, connect the manifold gauge
to liquid side pipe and the gas side pipe.
Vacuum Procedure for the System
VRF-SVN34A-EN47
Page 48
Insulating Refrigerant Pipes
Service valves
Insulating Refrigerant Pipes
After determining that there are no leaks in the refrigerant pipes, insulate them as described:
1. U se Table 27 to select the insulation thickness according to pipe size and humidity conditions.
Table 27. Pipe insulation selector
Insulation Type
Standard conditions
86°F (30°C), 85%
Pipe size
Pipe
Liquid pipe
Gas pipe
(a) When installing insulation in any of the following environments, use insulation required for high humidity conditions: Buildings with close proximity to
bodies of water or hot springs or on the side of a hill in which the building is partly covered by earth; ceilings frequently exposed to moisture such as
in restaurants, saunas, swimming pools, and corridors of dormitories or studios near a frequently-used outdoor exit; buildings with no ventilation system.
(b) Internal temperature of gas pipe is higher than 248°F (120°C).
1/4 (6.35) – 3/8 (9.52)3/8 (9)3/8 (9)
1/2 (12.70) – 2 (50.80)1/2 (13)1/2 (13)
1/4 (6.35)1/2 (13)3/4 (19)
3/8 (9.52) – 1 (25.40)
(b)
1-1/8 (28.58) – 1-3/4 (44.45)1-1/4 (32)
2 (50.80)1.0 (25)1-1/2 (38)
in. (mm)
3/4 (19)
EPDM or NBR
(in. (mm)
High humidity conditions
86°F (30°C), over 85%
1.0 (25)
(a)
2. Wrap insulation around the entire surface of each pipe, including the refrigerant pipes from the
indoor unit to the service valves inside the outdoor unit, the branch joints, distribution header,
and connection points on each pipe.
Note: For details on insulating branch joints, refer to the branch joint installation manual (VRF-
SVN41).
• Do not wrap the gas and liquid refrigerant pipes together.
• Overlap insulation to avoid gaps.
• Avoid compressing the insulation as much as possible.
48 VRF-SVN34A-EN
Page 49
• Be sure there are no cracks or deformities in the insulation at bends in pipes.
Clamp
Insulation
Gas side pipe
Liquid side pipe
• If necessary double the insulation to prevent condensation from forming in warm or humid
areas.
3. Clamp insulation tightly to the pipes.
4. Cut off excess insulation.
Refrigerant Charging
Refrigerant Charging
WARNI NG
Hazard of Explosion and Deadly Gases!
Do not heat the refrigerant container to speed up the charging process. An explosion could
result, resulting in death or serious injury.
NOTICE
Risk of Unit Malfunction!
Do not leave the front panel open while charging refrigerant. If the front panel is open, the
amount charged into the unit will be incorrect.
NOTICE
Unit Component Damage!
Open the gas side and liquid side service valves completely after charging the refrigerant. If
you operate the unit with the service valves closed, the unit may be damaged.
After vacuuming and leak testing the system, charge the system with refrigerant as explained in
the following procedure:
1. Calculate the correct amount of refrigerant using Table 28, p. 50 through Table 31, p. 51.
2. Open the liquid and gas service valves and add the liquid refrigerant, making sure the
refrigerant bottle is held in an upright position. Use a scale to determine that the correct amount
has been added.
3. Close the refrigerant container immediately after adding the refrigerant.
VRF-SVN34A-EN49
Page 50
Refrigerant Charging
Calculating Refrigerant
Table 28. Initial refrigerant quantity for each outdoor unit model
Model
Initial refrigerant
quantity: lb (kg)
Note: Add the initial refrigerant quantity shown in this table to the refrigerant calculated in Tab l e 2 9 through Table 31, p. 51.
4TV*0072*****4TV*096*****4TV*120*****4TV*144*****
12.1 (5.5)16.3 (7.4)16.3 (7.4)19.2 (8.7)
Table 29. Refrigerant quantity according to liquid pipe diameter and length (a)
Diameter of liquid pipe:
in. (mm)
Additional refrigerant
quantity: lb/ft (kg/m)
Note: For an indoor unit with a factory-installed EEV, the quantity of refrigerant in addition to the quantity based on the unit capacity (Ta b l e 2 8 ) is 0.0067 lb/ft
Table 30. Refrigerant quantity for each indoor unit (b)
Capacity (MBH)
7. 599.51218202430364876.896
Model
1-way cassette
(4TVE00**B100NB)
Mini 4-way cassette
(4TVB00**B100NB)
4-way cassette
(4TVC00**B100NB)
Slim duct
(4TVL00**B100NB)
MSP duct
(4TVD00**B100NB)
HSP duct
(4TVA00**B100NB)
High-wall
(4TVW00**B100NB)
Convertible
ceiling/floor
(4TVX00**B100NB)
Notes:
• Additional refrigerant charging of MCU is 1.1 lb (0.5 kg) for every MCU kit.
• For an indoor unit with an AHU kit, add 0.04 lb (0.018 kg) of refrigerant for 1 MBH capacity of the AHU kit.
0.55
(0.25)
0.99
(0.45)
0.53
(0.24)
0.53
(0.24)
0.55
(0.25)
0.82
(0.37)
0.53
(0.24)
0.53
(0.24)
0.55
(0.25)
0.82
(0.37)
0.53
(0.24)
0.53
(0.24)
Refrigerant quantity: lb (kg)
0.82
(0.37)
0.99
(0.45)
0.99
(0.45)
0.62
(0.28)
0.79
(0.36)
0.86
(0.39)
0.82
(0.37)
0.79
(0.36)
0.99
(0.45)
0.99
(0.45)
0.62
(0.28)
0.79
(0.36)
0.86
(0.39)
1.52
(0.69)
0.93
(0.42)
1.19
(0.54)
1.52
(0.69)
0.93
(0.42)
1.19
(0.54)
1.50
(0.68)
1.52
(0.69)
1.37
(0.62)
1.50
(0.68)
1.50
(0.68)
2.60
(1.18)
2.60
(1.18)
50 VRF-SVN34A-EN
Page 51
Refrigerant Charging
Note: For heat recovery systems, add 1.1 lb (0.5 kg)
additional refrigerant for each MCU kit.
Table 31. Calculation example for refrigerant amount additional to basic unit amount
Liquid pipe (a)
diameter
in. (mm)
Refrigerant amount
(lb/ft)
Pipe length (ft)
from Table 29, p. 50)
(1)(2)(1) x (2) (1) x (2)
Additional
refrigerant
amount (lb)
Total additional
refrigerant (lb)
1/4 (6.35)114.80.0131.49
12.193/8 (9.52)164.00.0406.56
1/2 (12.70)49.20.0844.13
Refrigerant amount
Indoor unit (b)
model
4-way cassette
(4TVC00**B100NB)
Slim duct
(4TVL00**B100NB)
Slim duct
(4TVL00**B100NB)
1-way cassette
(4TVE00**B100NB)
Notes:
• The total amount of refrigerant in the system must not exceed 220 lb (100 kg). If the refrigerant weight exceeds this amount,
separate the modules into smaller modules (or units) so that the maximum weight is not exceeded. For example, for 4TV*144*****,
the basic amount of refrigerant is 19.1 lb (8.7 kg). Therefore, the total amount of additional refrigerant (a) + (b) should not exceed
200.9 lb (91.3 kg
• For each MCU kit, additional refrigerant charging is 1.1 lb (0.5 kg).
• For an indoor unit with an AHU kit, add 0.04 lb (0.018 kg) of refrigerant for 1 MBH capacity of the AHU kit.
• When calculating refrigerant for heat recovery apps, make sure you add
Number of units
(1)(2)(1) x (2) (1) x (2)
40.993.96
20.991.98
10.530.53
10.550.55
(lb/each)
from Table 30, p. 50)
Additional
refrigerant
amount (lb)
Total additional
refrigerant (lb)
7.02
Example:
12 MBH
1/4 (6.35), 16.4 (5)
24 MBH
1/4 (6.35), 32.8 (10)
24 MBH
1/4 (6.35), 49.2 (15)
3/8 (9.52), 32.8 (10)
3/8 (9.52), 32.8 (10)
18 MBH
18 MBH
18 MBH
144 MBH
1/2 (12.7), 16.4 (5)
1/2 (12.7), 16.4 (5)
1/2 (12.7), 16.4 (5)
3/8 (9.52), 32.8 (10)
3/8 (9.52), 32.8 (10)
3/8 (9.52), 32.8 (10)
12 MBH
18 MBH
Units:
Pipe diameter: in. (mm)
Pipe length: f (m)
1/4 (6.35), 16.4 (5)
VRF-SVN34A-EN51
Page 52
Refrigerant Charging
Single installation
Module installation
Charging Refrigerant
To charge refrigerant:
1. With the unit still in a vacuum, open the manifold gauge valve connected to the liquid side
service valve and add the liquid refrigerant.
2. If you are unable to add all of the refrigerant needed into the liquid side, close the liquid side,
remove the liquid manifold hose, then open the gas valve.
3. Press K2 once to initiate refrigerant charging in cooling mode.
4. To determine if the amount of refrigerant added is correct, use the automatic refrigerant
function (see
Figure 29. Charging additional refrigerant
Figure , p. 64).
5. After charging the refrigerant, close both caps as shown in the figure below.
• Tightening torque for refrigerant port cap: 7.4–8.9 lbf-ft (10–12 N-m)
• Tightening torque for control cap: 14.8–18.4 lbf-ft)
• Opening/closing torque for the valve (> 3/4 in. [19 mm]): 7.4 lbf-ft (10 N-m)
52 VRF-SVN34A-EN
Page 53
Control System
The control board (Fig 28) contains, a 4-digit display, a DIP switch, three rotary switches, and four
buttons, as shown in Figure 30. Their functions are explained in this section.
Hazardous Voltage!
Before making contact with the inverter circuit board, wait for at least 15 minutes after
powering down the outdoor unit to allow the unit to fully discharge high DC voltage. Failure to
allow the high DC voltage to discharge completely could result in death or serious injury.
Figure 30. Control board
Control System
WARNI NG
4-digit display
Buttons
SW53
SW53
SW51SW52
MCU
TEN
ONE
TENS
DIGIT
ONES
DIGIT
SW57
MCU
VRF-SVN34A-EN53
Page 54
Control System
SW53
SW57
SW51SW52
TENS
DIGIT
ONES
DIGIT
MCU
System Monitoring
The 4-digit display indicates system power and communication status.
Table 32. 4-digit display
EventDigit 1Digit 2Digit 3Digit 4
Power up
Establishing
communication between
outdoor and indoor units
Transmit/receive
(normal operation)
(a) 4-digit display example showing power-up is shown in Figure 30.
(b) Mode change unit.
(a)
“8”“8”“8”“8”
“A”“d”Number of connected indoor units
Indoor unit: “A”
(b)
MCU
: “C”
Indoor unit: “0”
MCU: “1”
System Configuration: DIP and Rotary Switches
The outdoor unit control board contains one DIP switch and three rotary switches (Figure 31). Use
them to configure the system as described in Table 33.
Figure 31. Switches on outdoor unit control board
Unit address (decimal number)
Table 33. System configuration using control board switches
Switch
(a) For illustration of switches, refer to Figure 31.
(b) For module installations, one outdoor unit needs to be designated as the main unit. The remaining outdoor units must be designated as sub-units.
54 VRF-SVN34A-EN
(a)
SW51/
SW52
SW57Use to set total number of connected MCUs
SW53
Use to set total number of installed indoor units
K5OffNot used. Default: Off
K6
K7On
K8On
K7On
K8Off
K7Off
K8On
K7Off
K8Off
On
OffDisables maximum capacity restriction for cooling operation.
Function description and notes
Set at main outdoor unit only.
Note: For example, if 12 indoor units are installed, SW51: 1, SW52: 2.
Set at main outdoor unit only.
Note: For example, if 3 MCUs are installed, SW57: “3”.
If 10 MCUs are installed, SW57: “A”.
Enables maximum capacity restriction for cooling operation.
Use to re
capacity.
Use to set outdoor unit address: No.
Use to set outdoor unit address: No.
Use to set outdoor unit address: No.
Not used
strict excessive capacity increase when operating indoor
1 (main unit)
2 (sub-unit 1)
3 (sub-unit 2)
(b)
units
with small
Page 55
Control System
Buttons
4-digit display
Digits 1 and 2 change to the number representing the
selected option.
Digits 3 and 4 change to the number representing the
selected value.
The control board has four buttons, K1–K4, and a 4-digit display for configuring system options.
Figure 32. Buttons and 4-digit display on the outdoor unit control board
To set options:
1. When the unit is not operating, press and hold K2 (5 seconds) to enter the option setting mode.
The 4-digit display will appear as shown. (If compressor cut-off is enabled, digit 4 will be “1”
or “2”.)
2. To select a different option, press K1 repeatedly until the number representing the selected
option appears for digits 1 and 2. (See the “Digit 1” and “Digit 2” columns in Tab le 34, p. 56 for
the list of option numbers.) For example, choose “01” on the main outdoor unit to select the
cooling capacity correction option.
3. To change the value for the option selected in Step 2, press K2 repeatedly for 1 second until the
number representing the selected value appears for digits 3 and 4. (See the “Digit 3” and “Digit
4” columns in
Ta bl e 34, p. 56 for the list of values.)
For example, if you select “01” for digits 1 and 2, and “04” for digits 3 and 4, the cooling capacity
correction selection is 50–53.6°F (10–12°C).
4. To save the value you have selected in Step 3, press and hold the K2 for 5 seconds. The 4-digit
display will blink as it enters tracking mode. The selected value will be saved when the display
returns to normal.
Note: To the previous value instead of saving the selection, press and hold K1 (5 seconds). To
restore the factory default, press and hold K4 while in the option setting mode.
VRF-SVN34A-EN55
Page 56
Control System
Table 34. Options and corresponding settings
Option
Emergency
operation for
compressor
malfunction
Cooling capacity
correction
Heating capacity
correction
Current restriction
rate
Oil collecting
interval
Temperature for
triggering
operation
Outdoor unit
speed correction
defrost
fan
Outdoor
Digit 1Digit 2Digit 3Digit
unit
Single00
Main01
Main02
Single03
Main04
Main
Single06
05
4
00
01
02
00
0141-44.6 (5-7)
0248.2-51.8 (9-11)
0350-53.6 (10-12)
0451.8-55.6 (11-13 )
0553.6-57.2 (12-14)
0655.4-59 (13-15)
00
01362.6 (2.5)
02377.1 (2.6)
03391.6 (2.7)
04406.1 (2.8)
05420.6 (2.9)
06449.6 (3.1)
07464.1 (3.2)
08478.6 (3.3)
00
0195%
0290%
0385%
0480%
0575%
0670%
0765%
0860%
0955%
1050%
11
00
01
00
01
00
0
Disabled (factory
Compressor
Compressor
44.6-48.2 (7-9): f ac tory
435.1 (3.0): factory
100%: factor y
No
restriction
Fac tory
Shortens interval
Disable snow prevention function
(factory
Enable when installation is in a
humid area such as near a river
or lake
Fac tory
Increase fan
1
value
ValueComments
1: malfunction state
2: malfunction state
default
default
default)
default
speed to maximum
default)
default
by 1/2
default
E560 will occur if all compressors are set to
malfunction state.
Targeted evaporating tempera
When low temperature value
discharged
Targeted high pressure
When
temperature
Enabling this setting may decrease cooling and
heating performance.
air
temperature
low pressure value
of the
indoor unit
ture: °F(°
is
set, indoor unit
will decrea
: psi (MPa).
is set,
discharged
will decrease
C).
se.
air
.
56 VRF-SVN34A-EN
Page 57
Table 34. Options and corresponding settings (continued)
Control System
Outdoor
Option
Night-time
mode
High-head
setting
Long piping
condition
Energy saving
mode
Rotation defrost
Expand operational
temperature
for
operation
Channel address Main13
Snow
accumulation
prevention control
(a) Enabling this setting is unnecessary if high-head condition is set.
(b) Heat recovery only.
cooling
silent
condition
(a)
range
(b)
unit
Main
Main08
Main09
Main10
(b)
Main11
Main12
Main14
Digit 1Digit 2Digit 3Digit
4
00
07
01Level 1
02Level 2
03Level 3
00
01
02
03
00Disabled (factory default)When the equivalent length of the farthest
01Level 1
02Level 2
00Disabled (factory default)If enabled, energy saving mode triggers
01Enabled
00Disabled (factory default)If enabled, continuous heating operation is
01Enabled
00Disabled (factory default)If enabled, continuous cooling operation is
01Enabled
AU
0–15
00Enabled (factory default)
01Disabled
ValueComments
Disabled (factory
Disabled (factory
Case 1: height difference type 1
(indoor unit is lower than
outdoor unit)
Case 2: height difference type 1
(indoor unit is lower than
outdoor unit)
Height difference type 2
(outdoor unit is lower than
indoor unit)
Automatic setting (factory
default)
Manual setting for channel:
0–15
default)
default)
When the outdoor unit
80 m)
above the indoor
When the outdoor unit
(
80 m) above the indoor
When the indoor unit
(30 m)
above the outdoor
indoor unit from the outdoor unit is between
328.08–557.74 (100–170 m).
When equivalent length
from the outdoor unit
when the room temperature reaches
setpoint while operating in heating mode.
possible but heating performance will
decrease during rotation defrost operation.
possible even in low temperature condition
down to 5°F (-15°C), but MCU noise will
increase.
Used for centralized control.
If enabled, the fan may rotate when the unit
is not operating.
is
131.23–262.47
unit.
is
more than 262.47 ft.
unit.
is more than
of
is
over 557.74 ft (
unit.
farthest
98.43 ft
indoor
ft (
40–
unit
170 m ).
VRF-SVN34A-EN57
Page 58
Control System
System Configuration: Buttons K1–K4
Buttons K1 and K2 are used to initiate system operations. The 4-digit display responds as shown
in the last column of the following tables.
Table 35. Button K1
Number of times button
K1 is pressed
1 (hold for 5 seconds)Test operation
1
2
3
4
5
6
7
8
9
10
11
12
Refrigerant
Te s t o pe r a t i o n
Pump out
Pump out
Pump out
Pump out
Vacuuming (Outdoor unit address
Vacuuming (Outdoor unit address
Vacuuming (Outdoor unit address
Vacuuming (Outdoor unit address
Vac uum ing
End
charging in heating mode
in heating
in heating
in heating
in heating
(All)
operation
Operation4-digit display
K - K- Blank - Blank
K - 1 - Blank - Blank
in heating mode
mode (Outdoor unit address
mode (Outdoor unit address
mode (Outdoor unit address
mode (Outdoor unit address
1)
2)
3)
4)
1)
2)
3)
4)
K - 2 - Blank - Blank
K - 3 - Blank - 1
K - 3 - Blank - 2
K - 3 - Blank - 3
K - 3 - Blank - 4
K - 4 - Blank - 1
K - 4 - Blank - 2
K - 4 - Blank - 3
K - 4- Blank - 4
K - 4- Blank - A
—
Table 36. Button K2
Number of times
button K2 is
pressed
1
2
3
4
5
6
7Forced defrost
8
9Inverter check compressor 1
10Inverter check for compressor 2
11Inverter check for fan 1
12Inverter check for fan 2
13End operation—
(a) Discharge mode may not operate normally if an error code occurs. If an E464 or E364 occurs, do not use the discharge
mode because the power element may be damaged.
(b) If button K2 is pressed the specified number of times and the inverter check is not successful, an error code will appear
on the 4-digit display.
Refrigerant
Te s t o p e ra t i on
Pump down
Pipe inspection (heat pump: test
Checking the amount
Discharge
Forced
oil collection
Operation4-digit display
charging in
in
all
mode
cooling
units
(a)
cooling
mode
in
cooling
mode
of refrigerant
(b)
(b)
(b)
mode
operation)
(b)
K - 5 - Blank - Blank
K - 6 - Blank - Blank
K - 7 - Blank - Blank
K - 8 - Blank - Blank
K - 9 - X - X
(last digits may differ depending on status)
K - A - Blank - Blank
K - B - Blank - Blank
K - C - Blank - Blank
K - D - Blank - Blank
K - E - Blank - Blank
K - F - Blank - Blank
K - G - Blank - Blank
Table 37. Button K3
Number of
times button K3
is pressed
1
Initialize (reset)
Operation4-digit display
operation
Same
as
power up: “8888”
58 VRF-SVN34A-EN
Page 59
Table 38. Button K4
Control System
Number of
times button
K4 is
pressed
4TV*0072***** (6 ton)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22ESC EEV stepM
23HR EEV stepN
24
25
26
27Suction 2 temperature (HR)R
28Master indoor unit addressS
4TV*0096***** (8 ton)Off, 1, 0
4TV*0120***** (10 ton)Off, 1, 2
4TV*0144***** (12 ton)Off, 1, 4
Command frequency
compressor
Command frequency
compressor
High pressure
Low pressure
Discharge temperature
Discharge temperature
IPM temperature
IPM temperature
CT sensor value
CT sensor value
Suction
COND Out
Temperature
TOP temperature
TOP temperature
Outdoor
ESC inlet
ESC outlet
Main EEV1
Main EEV2
Fan step (SSR
Current frequency
Current frequency
Operation
1
2
temperatureC
temperatureD
temperatureH
temperatureI
temperatureJ
stepK
stepL
of
of
of COMP16188.6°F (87°C)→0, 8, 7
of COMP27188.6°F (87°C)
of COMP18188.6°F (87 ?)
of COMP29188.6°F (87 ?) →0, 8, 7
of COMP1A2 A →0, 2, 0
of COMP2B2 A
of
liquid
pipeE
of COMP1F
of COMP2G
or BLDC)O
of COMP1P
of COMP2Q
the
the
4-digit display
Digit 1Digits 2, 3, 4
Off, 0, 8
1
2120 Hz → 1, 2, 0
3120 Hz → 1, 2, 0
4220.46 psi (1.52 MPa) →1, 5, 2
→
→
0, 2, 0
→
→
→2, 0, 0
→2, 0, 0
→3, 0,
→3, 0,
→0, 1,
→ -, 4, 2
→
0, 8, 7
0, 8, 7
-, 4, 2
-, 4, 2
562.37 psi (0.43 MPa)
→
-43.6°F
(-42°C) →-, 4, 2
-43.6°F
(-42°C) →-, 4, 2
-43.6°F
(-42°C)
-43.6°F
(-42°C)→-, 4, 2
-43.6°F
(-42°C)→-, 4, 2
-43.6°F
(-42°C)
-43.6°F
(-42°C)→-, 4, 2
-43.6°F
-43.6°F
If master indoor unit is not selected → Blank, N, D
If indoor unit No. 1 is selected as master indoor unit
(-42°C)→ -, 4, 2
2
000
steps
2
000
steps
300 steps
300 steps
steps
13
120
Hz →1,2,0
120
Hz →1,2,0
(-42°C)
0, 0, 1
0, 4, 3
0
0
3
→
VRF-SVN34A-EN59
Page 60
Control System
Table 39. Button K4 (pressed and held for 3 seconds)
Number of times
K4 is pressed and
held 3 seconds
1
2
3
4
5
6
7
(a)
8
(a)
9
(a) Toggles between indoor unit and MCU.
Software version
Main circuit board
Hub circuit board
Inverter
1 version“INV1” “1412”
Inverter
2 version“INV2” “1412”
Fan 1 version
Fan 2 version
EEP
version
Automatically assigned
unit addresses
Manually assigned unit
addresses
version
version
4-digit display: toggles between (1) and (2)
Device
(1)
“MAIN” “1412”
“HUB” “1412”
“FAN1” “1412”
“FAN2” “1412”
“EEP” “1412”
Version (2): examples
Digit 1Digit 2Digit 3, 4
Address (example)
“AUTO”
“MAIN”
Indoor unit: “A”
MCU: “C”
Indoor unit: “A”
MCU: “C”
Indoor unit: “0”
MCU: “1”
Indoor unit: “0”
MCU: “1”
“07”
“15”
60 VRF-SVN34A-EN
Page 61
Pre-Start Checks
After installation and before the test operation is conducted, perform the following pre-start checks:
Avoid Damage to the Communication Circuit!
Do not measure the communication terminal with an insulation tester. Doing so will damage
the communication circuit.
1. Ensure that the power and communication cables of the indoor and outdoor units are properly
connected.
2. Before supplying power, use a 500 Vdc (4TV*****B400NB) or 600 Vdc (4TV*****B300NB)
insulation resistance tester to measure the power terminal (3 phase: R, S, T) and the outdoor
unit grounding. The resistance measurement should be over 30 M.
3. Before supplying the power, use a voltmeter and phase tester to check the voltage and the phase
between wires (R-S, S-T, T-R): 460 V (TV*****B400NB) or 230 V (4TV*****B300NB).
Pre-Start Checks
NOTICE
4. Ensure that the indoor units are connected.
5. The protection system cuts power to the PCB for overvoltage when N phase is cross-wired to
the R, S, and T terminals. Check the power connection from N phase if the PCB is not turned on.
6. Check for a short-circuit between the communication terminal and ground.
7. Ensure that the pre-start checklist (Tab l e 40) has been completed.
Table 40. Pre-start checklist
• Have you checked the external surface and the inside of the outdoor unit?
Outdoor unit
Installation
Indoor unit
Refrigerant pipe
• Is there any possibility of short circuit due to the heat of an outdoor unit?
• Is the place well-ventilated and meets recommended requirements for
clearances and service?
• Is the outdoor unit installed securely to withstand the external force?
• Have you checked the external surface and the inside of the indoor unit?
• Is there enough space for service?
• Have you ensured that the center of the indoor unit is installed
horizontally and is level?
• Have you selected the correct pipes?
• Are the liquid and gas valve open?
• Is the total number of connected indoor units within the allowable range?
• Are the length and the height difference between the refrigerant pipes
within the allowable range?
• Are the branch joints properly installed?
• Has the connection of liquid and gas pipes been correctly performed?
• Have you selected correct insulator for pipes and insulated them
correctly?
• Is the pipe or connection part properly insulated?
• Is the quantity of the additional refrigerant correctly weighed in? (You
must record the amount of
• additional refrigerant charging on the service record paper placed outside
the outdoor unit.)
• During the test operation, cooling/heating modes are selected automatically.
• In the temperature range marked with hashed lines, system protection control may trigger during operation. (If this
occurs, the test operation may be difficult to judge correctly.
• When the temperature is outside of the guaranteed range, test operation accuracy of may decrease to the borderline
area shown in the graph.
Table 40. Pre-start checklist
Drain pipe
Electrical
Setting address
Option• Ensure that the isolation frame is correctly installed.
Test Operation
Perform the test operation after all pre-start checks have been completed (See “Pre-Start Checks”
p. 61) and within the following temperature conditions:
• Have you checked whether the drain pipes of the indoor unit and outdoor
unit are connected together?
• Have you completed the drain test?
• Is the drain pipe properly insulated?
• Are the power cable and communication cable tightened firmly on the
terminal board within the rated torque recommendations?
• Have you checked for cross connection of the power and communication
cables?
• Have the outdoor unit been properly grounded??
Is shielded cable used for the communication cable?
• Is the wire length within the recommended limit?
• Is the wiring route correct?
• Are the address of the indoor and outdoor units properly set?
• Are the address of the indoor and outdoor units properly set (when using
multiple remote controllers)?
62 VRF-SVN34A-EN
Hazardous Voltage, Rotating Components!
Do not operate the product with the panel or duct outlet protection net off. There is risk of
personal injury from parts that rotate or contain high voltage.
WARNI NG
Page 63
Test Operation
CAUTION
Risk of Burn or Frostbit!
Refrigerant pipe may be hot or cold during or right after the operation depending on the status
of the refrigerant which flows through the refrigerant pipe, compressor, and other parts of the
refrigerant cycle. Do not touch the refrigerant pipe during or right after the operation to avoid
getting burned our frostbit.
NOTICE
Avoid Unit Damage!
Wait at least 5 minutes before turning off the main power after the inspection test is finished. If
you do not, water leakage or other problems may occur.
Wait at least 6 hours after power is supplied to the outdoor unit before operating it to allow
time for the crank case heater to pre-heat. If the crank case heater is not pre-heated before
operation, unit parts are at risk of being seriously damaged.
1. Provide power to the outdoor unit at least 6 hours before operating it.
Notes: When power is supplied to the outdoor unit, it will check for and verify communications
with the indoor units.
2. Ensure that the front of the outdoor unit is closed.
3. Press and hold button K1 for 5 seconds to run the test operation (see Ta b le 35, p. 58.)
• While the test operation is running and after the communication check, UP (UnPrepared)
appears on the digital display and the compressor is restricted from operating. The display
will clear automatically when the test operation is completed.
• The test operation may proceed from 20 minutes to maximum 2 hours depending on the
operating status.
• During the test operation, noise may occur due to valve inspection. (Examine the unit if
abnormal noise continually occurs.)
4. If error codes E503, E505, or E506 occur during the test operation, refer to “Error code E503”
p. 65 or “Error code E505 and E506” p. 65. If any other errors occur or if an inspection is needed,
refer to the service manual.
5. When the test operation ends, use VRF Enterprise Management Software or VRF AutoCommissioning Tool to issue a test results report. If any items in the report are marked with an
“inspection required” sign, refer to the service manual for information on correcting the items
and run the test operation again.
6. Ensure the following:
• The system has the correct refrigerant amount (see “Automatic refrigerant detection
operation” p. 64) after the unit has been operating in cooling mode for at least 30 minutes
• Cooling/heating operation runs normally.
• Air flow direction and fan speed of indoor units runs normally.
• There are no abnormal operating noises from indoor or outdoor units.
• During cooling operation, the indoor units drain properly.
7. Use VRF Enterprise Management Software to check operating status details.
8. Explain to the user how to use the indoor unit, and leave indoor unit manual with the user for
their reference.
VRF-SVN34A-EN63
Page 64
Automatic refrigerant detection operation
Start
Press the K2 button 5 times
Detect amount of refrigerant
Judge the amount of
refrigerant
Judge the amount of
refrigerant
Satisfy the temperature
condition
Satisfy the temperature
condition
Detect amount of refrigerant
Input VRF Technicial Uti lities signal
End
Normal
Judgment
not available
(Normal) (Excessive) (Insufficient) (Judgment not
available)
Excessive amount of
refrigerant
Insufficient
amount of
refrigerant
Insufficient
degree of
supercooling
Input VRF Auto-Commissioning
Tool signal
Automatic refrigerant detection operation
Use the refrigerant amount detection operation after operating the product in cooling mode for at
least 30 minutes.
•If the unit operation cycle is unstable, the refrigerant detection operation may end before it is
completed.
•The refrigerant detection operation result may be inaccurate if
– If the refrigerant detection operation is run after the unit has been shut down for a long
period of time.
– If the unit installation environment causes the unit to trigger protection controls.
After the refrigerant detection operation is complete, take the following actions:
•If the amount of refrigerant is excessive, discharge 5% of the detected amount and restart the
refrigerant amount detection operation.
•If the amount of refrigerant is insufficient, add 5% of the detected amount and restart the
refrigerant amount detection operation.
•If the degree of supercooling is insufficient, add 10% of the detected amount of refrigerant and
restart the refrigerant amount detection operation.
•If the result is unavailable, check that the refrigerant detection operation was executed within
64 VRF-SVN34A-EN
the guaranteed temperature range. Perform a test operation to determine if there are any other
problems with the system.
Page 65
Troubleshooting
Is the service valve
of the outdoor unit
opened?
Open the service valve of
the outdoor unit.
Is the 4-way valve and
main EEV operating
normally?
Check the 4-way valve
and Main EEV.
Check for leakage on the
system. Perform vacuuming /
charge refrigerant.
Is the quantity of
refrigerant appropriate?
1. Run the test operation for more than 30 minutes.
2. Run Fan mode for more than 10 minutes.
3. Restart the test operation.
No
No
No
Ye s
Ye s
Ye s
Enable vacuum mode on all outdoor units.
Is the service valve of the outdoor unit opened?
Open the service value of the
outdoor unit.
Does the input sensor value of the installed
outdoor unit satisfy:
Max/min value difference of low pressure >2
Max/min value difference of high pressure >2
Reset the outdoor unit.
Disable vacuum mode on all outdoor units.
Run test operation.
End
Analyze cycle data. Check the input
sensor; replace if defective.
No
No
Ye s
Ye s
Error code E503
Troubleshooting
Error code E505 and E506
VRF-SVN34A-EN65
Page 66
Warranty For Trane Advantage™ VRF Systems and Related Accessories
Warranty For Trane Advantage™ VRF Systems and
Related Accessories
Products Covered. This warranty is extended by Trane, and applies to all Trane Advantage™ VRF
systems and accessories for these products which are sold by Trane and applied in accordance with
Trane specifications.
Basic Warranty
The warrantor warrants for a period of 12 months from the initial start-up or 18 months from date
of shipment, whichever is less, against failure due to defects in material and manufacture and that
it has the capacities and ratings set forth in Company’s catalogs and bulletins (“Warranty”).
If the following conditions are met, the warrantor extends this basic warranty period to five (5)
years from date of start-up:
•The system is designed using an approved application tool (VRF Select).
•The system is installed by a contractor who has successfully completed a Trane factory training
class.
•A verified commissioning report from the Trane VRF Commissioning Tool is submitted.
Exclusions and Limitations
Exclusions from this Warranty include damage or failure arising from: wear and tear; corrosion,
erosion, deterioration; modifications made by others to the Equipment; repairs or alterations by
a party other than Company that adversely affects the stability or reliability of the Equipment;
vandalism; neglect; accident; adverse weather or environmental conditions; abuse or improper
use; improper installation; commissioning by a party other than Company; unusual physical or
electrical or mechanical stress; operation with any accessory, equipment or part not specifically
approved by Company; refrigerant not supplied by Company; and/or lack of proper maintenance
as recommended by Company. Company shall not be obligated to pay for the cost of lost
refrigerant or lost product. Company's obligations and liabilities under this Warranty are limited to
furnishing replacement equipment or parts, at its option, FCA (Incoterms 2000) factory or
warehouse (f.o.b. factory or warehouse for US domestic purposes) at Company-designated
shipping point, freight-allowed to Company's warranty agent's stock location, for all nonconforming Company-manufactured Equipment (which have been returned by Customer to
Company. Returns must have prior written approval by Company and are subject to restocking
charge where applicable. Equipment, material and/or parts that are not manufactured by Company
are not warranted by Company and have such warranties as may be extended by the respective
manufacturer. COMPANY MAKES NO REPRESENTATION OR WARRANTY, EXPRESS OR IMPLIED,
REGARDING PREVENTION OF MOLD/MOULD, FUNGUS, BACTERIA, MICROBIAL GROWTH, OR
ANY OTHER CONTAMINATES. No warranty liability whatsoever shall attach to Company until
Customer’s complete order has been paid for in full and Company's liability under this Warranty
shall be limited to the purchase price of the Equipment shown to be defective. EXCEPT FOR
COMPANY’S WARRANTY EXPRESSLY SET FORTH HEREIN, COMPANY DOES NOT MAKE, AND
HEREBY EXPRESSLY DISCLAIMS, ANY WARRANTIES, EXPRESS OR IMPLIED CONCERNING ITS
PRODUCTS, EQUIPMENT OR SERVICES, INCLUDING, WITHOUT LIMITATION, ANY WARRANTY
OF DESIGN, MERCHANTABILITY OR OF FITNESS FOR A PARTICULAR PURPOSE, OR OTHERS
THAT ARE ALLEGED TO ARISE FROM COURSE OF DEALING OR TRADE.
Additional warranty protection is available on an extra-cost basis and must be in writing and
agreed to by an authorized signatory of the Company. Additional terms and conditions of warranty
coverage are applicable for refrigeration equipment. If you wish further help or information
concerning this warranty, contact: Trane—Warrantor, 2701 Wilma Rudolph Blvd., Clarksville, TN
37040.
66 VRF-SVN34A-EN
Page 67
Warranty For Trane Advantage™ VRF Systems and Related Accessories
VRF-SVN34A-EN67
Page 68
optimizes the performance of homes and buildings around the world. A business of Ingersoll Rand, the leader in
creating and sustaining safe, comfortable and energy efficient environments, offers a broad portfolio of advanced
controls and HVAC systems, comprehensive building services, and parts. For more information,
has a policy of continuous product and product data improvement and reserves the right to change design and specifications without notice.