Trane 4TYK6524D1000AL User manual

SAFETY WARNING
Only qualified personnel should install and service the equipment. The installation, start- 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 caution indications in the literature
and on the tags, stickers and labels that are attached to the equipment.
May 2017 MS-SVN052E-EN
Heat Pump
4TXK6524D1000AL
4TXK6536D1000AL
4TXK6548D1000AL
4TXK6560D1000AL
4TYK6524D1000AL
4TYK6536D1000AL
4TYK6548D1000AL
4TYK6560D1000AL
MCC05 MCX05
MCD05
Cooling Only
Installation, Operation and
Maintenance Manual
U - M a t c h D C I n v e r t e r S y s t e m R-410A
Up To16 SEER
Outdoor Unit - Cooling Only and Heat Pump
24,000 to 60,000 BTU/h - 60Hz

2 MS-SVN052E-EN
Content
Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Unit Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Electrical Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
System Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

MS-SVN052E-EN 3
Warnings, Cautions and Notices
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.
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 refrigerants including industry replacements for
CFCs and HCFCs such as saturated or unsaturated HFCs and HCFCs.
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 according to local rules. For the USA, 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.
The three types of advisories are defined as follows:
WARNING Indicates a potentially hazardous situation which, if not avoided, could result
in death or serious injury..
CAUTIONsIndicates 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.
NOTICE Indicates a situation that could result in equipment or property-damage only
accidents.
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/national electrical
codes.
WARNING
Use of Refrigerant!
Failure to follow recommendations in the use of service equipment or components classified
for the use of R410A refrigerant, could give way to equipment or component explosion under
R410A pressures and as a result lead to death or serious injury or equipment damage. R410A
refrigerant works at a higher pressure than R22 refrigerant. Employ only service equipment or
components classified for use with this unit. In case of specific doubts related with the use of
refrigerant, consult your local Trane representative.

4MS-SVN052E-EN
Warnings, Cautions and Notices
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 required for the work
being undertaken (example; cut-resistant gloves/sleeves, butyl gloves, safety glasses, hard
hat/bump cap, fall protection, electrical PPE and arc flash clothing). ALWAYS refer to
appropriate Material Safety Data Sheets (MSDS)/Safety Data Sheets (SDS) and OSHA
guidelines for proper PPE.
• When working with or around hazardous chemicals, ALWAYS refer to the appropriate MSDS/
SDS and OSHA/GHS (Global Harmonized System of Classification and Labelling of
Chemicals) guidelines for information on allowable personal exposure levels, proper
respiratory protection and handling instructions.
• If there is a risk of energized electrical contact, arc, or flash, technicians MUST put on all PPE
in accordance with OSHA, NFPA 70E, or other country-specific requirements for arc flash
protection, PRIOR to servicing the unit. NEVER PERFORM ANY SWITCHING,
DISCONNECTING, OR VOLTAGE TESTING WITHOUT PROPER ELECTRICAL PPE AND ARC
FLASH CLOTHING. ENSURE ELECTRICAL METERS AND EQUIPMENT ARE PROPERLY RATED
FOR INTENDED VOLTAGE.

MS-SVN052E-EN 5
Identification
Identification
U-Match Inverter Unit (16 SEER) - R410A Refrigerant Voltage 220/230/1/60hz
Inspection
Upon arrival, the unit should be inspected in search of shipping damages. If these are detected,
they should be indicated on the delivery document presented by the transportation company.
Present the transportation entity a written request for inspection of damages. If further information
should be required, be sure to consult with your local distributor.
Requirements for installation/service of equipment using R410A refrigerant:
• Accessories such as pressure gauge, hoses, refrigerant containers and recovery system must
be designed to handle POE or PVE oils.
• Manifold gauge classification should be 800 PSIG on the high side and 250 PSIG on the low side
with 550 PSIG for restart on the low side.
• All hoses must be classified for 700 PSIG service pressure.
• Leak detectors must be designed to detect R-410A refrigerant.
• Recovery equipment (including containers for refrigerant recovery) must be designed
specifically to handle R-410A refrigerant.
•Do Not use a TXV for R-22.
• Good refrigeration practice requires the installation of a field provided liquid line filter dryer.
See Figure 1.
Outdoor Unit - Cooling Only
Model Capacity
4TYK6524D1000AL 24 MBH - 16 SEER
4TYK6536D1000AL 36 MBH - 16 SEER
4TYK6548D1000AL 48 MBH - 16 SEER
4TYK6560D1000AL 60 MBH - 16 SEER
Outdoor Unit - Heat Pump
Model Capacity
4TXK6524D1000AL 24 MBH - 16 SEER
4TXK6536D1000AL 36 MBH - 16 SEER
4TXK6548D1000AL 48 MBH - 16 SEER
4TXK6560D1000AL 60 MBH - 16 SEER

6MS-SVN052E-EN
Identification
Figure 1. Filter Dryer Installation
Limitations
The unit should be installed in accordance with all national, state and local codes and in compliance
with the following limitations:
1. All limitations shall be observed for the indoor unit as well as for the coil and appropriate
accessories.
2. The outdoor unit shall not be installed with ductwork in the passage of air current. The outdoor
fan is one of propeller type and is not designed to operate against any additional external static
pressure.
3. Maximum and minimum operating conditions shall be observed in order to ascertain that the
system offers maximum performance with minimum service.
4. This unit is not designed to operate with a low ambient kit. The control system shall not be
modified to operate with any type of low ambient kit.
5. The maximum length of line allowed for this product is of 100 feet.
Outdoor units are designed to connect to an indoor coil with brazed connection lines. These units
are shipped with factory charged refrigerant to be connected to a matched indoor coil and to 4.5m
(15 ft) of field provided lines.
Indoor coils are provided with a thermostatic expansion valve or a calibrated expansion orifice. The
size of the orifice and/or of refrigerant charge may require alterations in the case of some indoor-
outdoor unit combinations, differences in lift or total lengths of line.
It is better to open de service valve
after the removal of the bottom
access panel
Large service valve
Small service valve
Liquid line lter dryer .
Field provided and installed

MS-SVN052E-EN 7
Identification
Figure 2. Dimensional Data
Model Size Dimension (in) Refrigerant Connection
Service Valve Size
Height (in) (mm) Width (in) (mm) Liquid (in) Suction (in)
24 24-15/16 (633) 29-1/8 (740) 29-1/8 (740) 3/8 3/4
36 24-15/16 (633) 29-1/8 (740) 29-1/8 (740) 3/8 3/4
48 33-3/16 (843) 29-1/8 (740) 29-1/8 (740) 3/8 7/8
60 33-3/16 (843) 29-1/8 (740) 29-1/8 (740) 3/8 7/8
DIMENSIONAL DATA
CONTROL WIRING
7/8” (22.2mm)
KNOCKOUT
1-11/32” (34.5mm)

SERVICE
CONNECTOR
POWER WIRING
SEE DETAIL A
DETAIL A
ORIFICE
1-3/32” (27.8mm)
NOTE: GRILL APPEARANCE
MAY VARY
DISCHARGE AIR: ALLOW 60” (1.5m)
MINIMUM CLEARANCE
INCOMING AIR
DAMPER WITH
VENTS:
ALLOW 18” (0.45m)
MINIMUM
CLEARANCE
W
SUCTION LINE
CONNECTION
LIQUID LINE
CONNECTION
SERVICE CONNECTOR
SERVICE ACCESS
ALLOW 24”
MINIMUM CLEARANCE

8MS-SVN052E-EN
Unit Installation
Unit Installation
Location
Prior to the installation, select and verify the adaptability of the location for both indoor and outdoor
units. Take into consideration all limitations and clearance requirements. The outdoor unit must
comprise sufficient clearance for incoming air into the condenser, for discharge air, and for service
access. See Figure 2.
Important: In the case of multiple units installation, these must be spaced to contain a minimum
separation of 36 inches (face-to-face coils).
If the unit is to be installed on the roof with exposure to sun rays, or on a “blackened” surface, then
the unit must be placed over a base with sufficient elevation that will prevent the accumulation of
hot air being drawn into the outdoor unit.
Provide an appropriate structured support.
Installation on Outdoor Flat Surface
The unit may be installed on a solid flat surface which cannot shift or move in order to prevent stress
over refrigerant lines or possible leaks. Clearances must be maintained as can be seen in Figure
2. Installation must be completely balanced.
Normal operation levels of noise may prove to be objectionable if the unit is installed directly below
windows o close to bedrooms, studios, etc.
Important: Outdoor unit must not be installed in areas where accumulation of mud or ice may
cause personal injury or damages to the system.
Place the unit high enough to avoid blocking the entry of air due to ice/snow or in areas that are
prone to accumulate ice/snow. Isolate the unit away from drains to avoid mud slides/landslides of
the foundation.
Installation on the Roof
When installing the unit on the roof, the structure should be able to support the total weight of the
unit, including mounting frame, rails, etc., which must be used to minimize the transmission of
sound or vibrations to the conditioned space.
Installation of the unit
1. Provide a mounting base on the selected installation area.
2. Remove all packaging material and inspect the unit in search of possible damages.
3. Compressor fastening nuts must remain tightened.
4. Place the unit on the provided mounting base.
The outdoor unit must be connected to the indoor coil with the provided copper refrigerant piping.
The installation must employ only the approved sizes of pipes for system combinations.
Refrigerant charge shown on the unit’s nameplate refers to the lengths of standard size
interconnecting liquid line up to 15 feet.
Note: The use of a larger size of line from original specifications could cause problems of oil
return. The use of a much smaller size of line could cause loss of capacity and other
problems provoked by insufficient flow of refrigerant. Tilt the horizontal suction lines at
least 1” every 20 feet towards the outdoor unit to aid in the appropriate return of oil.

MS-SVN052E-EN 9
Unit Installation
Mounting of the Unit
If the unit is to be installed on a roof surface or on a concrete base, observe the following guidelines:
1. The provided base pan rises the heating pump 2” above the installation base.
2. If the unit is to be raised over the roof surface, use 4” x 4” boards (or equivalent) placed in a
manner that may allow weight to be evenly distributed and to prevent the transmission of noise
and vibrations. See Figure 3.
Note: Avoid the blockage of drain openings as shown in Figure 3.
3. If the unit is to be raised to avoid seasonal snow/ice buildup, make sure the elevation support
is sturdy enough to avoid unit’s falling or tilting.
Note: See Figure 4 for proper unit setting guidelines.
Figure 3. Recommended Rise Installation
Factory Recommendation for Mounting the Unit
1. Before installation, clean the mounting surface. Important = The cement base must comply
with local codes and be thick enough to sustain the installation of fasteners.
2. Center and level the unit over the base or mounting surface.
3. Using the provided L-shaped bracket, mark the boring holes over the concrete and bore holes
of at least 1/4” additional depth as compared to the bracket to be used. Important = Drill
screws should not exceed 3/8” in length to avoid harming the coil.
4. Tighten brackets and drill screws following conventional practices for the installation of these
supports. See Figure 4.
Note: Use one bracket at each side. For further stability, use 2 brackets at each side.
Note: Do not over-tighten brackets in order to avoid weakening the concrete material.
Elevation above the
snow line
Base pan (bottom view)
Avoid obstruction of
drain holes
Concrete base or
other appropriate
material

10 MS-SVN052E-EN
Unit Installation
IMPORTANT NOTE:
These instructions are intended to provide a method of installation of the unit to the concrete base
in order to establish a protective procedure in cases of strong winds. It is recommended to verify
local codes for the application of methods and protocols for secure setting of the unit.
Figure 4. Preferred Method for Unit Setting
Cautions to be Observed During Installation of Refrigerant Lines
1. Install lines with the least amount of curves possible. Avoid damaging line couplings or line
curves. Use clean and hard drawn copper tubing at points where it will not be necessary to
apply multiple curves around obstructions. When it is necessary to use soft copper, it should
be carefully applied avoiding sharp curves that may provoke any type of restriction.
2. Install lines avoiding any obstructions to the coil, to the air handling components o to the filter.
3. Take special care in the application of insulation to refrigerant lines in order to minimize the
transmission of sound to the structure.
4. When applying insulation material to the suction line, refrigerant lines should be supported as
illustrated in Figure 5. DO NOT allow any friction contact between metal piping.
5. Use PVC piping as conduit in all underground installations. See Figure 6. Underground lines
should be kept as short as possible in order to minimize the accumulation of liquid refrigerant
in the suction line during extended system shutdown periods.
6. In an effort to reduce vibrations and to retain some degree of flexibility, place a type of sealant
material like permagum or similar around refrigerant lines that must be directed through walls.
See Detail B
#7 X 3/8” drill screws
(Not to exceed 3/8” in length)
´ȋ´ZDVKHUDQGKH[VFUHZVIRUFRQFUHWH
(Pilot hole required 3/16”. Pilot hole should be 1/4” deeper than the space
occupied by the bracket).

DETAIL B
Brackets:
´ZLGH´WKLFN
height as required.
$YDLODEOHIURPYHQGRU
RULQWKHILHOG
6HHGLPHQVLRQVLQ)LJ

MS-SVN052E-EN 11
Unit Installation
Figure 5. Lines Support
Figure 6. Underground Installation
Figure 7. Typical Installation
Insulated liquid line
Insulation
optional
Wrong
Suggested Sheet metal support
Insulated
suction
line
A serpentín interior A unidad exterior
Tapa
Línea vapor aislada
Línea liquido
To
indoor
fan
To power
supply
To
Coil
Disconnect switch
Seal openings with Permagum sealant
or equivalent
24V signal
NOTE:All outdoor wiring should be weather proof

12 MS-SVN052E-EN
Unit Installation
Precautionary Measures During Line Brazing
All connections to indoor unit and to evaporator coil will be copper-to-copper. Brazing material
should be done with the use of a copper-phosphorous alloy such as Silfos-5 or equivalent. DO NOT
employ soft brazing alloy. Outdoor units contain service valves in both liquid and suction
connections. Total system refrigerant charge is retained inside the outdoor unit during shipment
and installation. Service valves are provided for evacuation and charging in accordance with these
instructions.
The application of precautionary measures to ensure that system is clean and dry will aid in the
avoidance of serious service problems.
¡CAUTION!
During line brazing always supply dry nitrogen through the lines due to the fact that temperature
is sufficiently high to cause metal oxide of copper tubing, unless an inert atmosphere is provided.
The flow of dry nitrogen must continue until the coupling/connection has cooled. Always use a
pressure regulator and security valve to ascertain that only low pressure dry nitrogen is introduced
into the line. Only a small amount of flow is required to move the air and prevent oxidation.
Precautionary Measures During Service Valve Brazing
Precautionary measures should be adopted to prevent heat damage to the service valve.Wrap a
wet cloth around the valve as shown in Figure 8. During brazing action, protect all painted surfaces
and insulation; also, be sure to remove the Schraeder core to protect it against high temperature
in the area due to the welding process. Once brazing has ended, wrap the coupling with a wet cloth.
In order to open the valve, it is necessary to remove the top of the plunger/piston and insert a hex
wrench over the valve stem to turn it counterclockwise until the valve stem reaches the angled
retention wall.
Connect refrigerant lines as follows;
1. Remove the Schraeder core taps from both service ports of liquid and suction lines’ service
valves on the outdoor unit. Connect low pressure nitrogen flow to the service port of the liquid
line.
Figure 8. Protection against heat
2. Weld the liquid line to the liquid valve on the outdoor unit. Do not forget to wrap the body of
the valve with a wet cloth. Continue to allow the flow of nitrogen.
3. Protect the suction valve with a wet cloth and braze the suction line connection to the outdoor
unit. The flow of nitrogen should be leaving the system from the service port connection of the
suction line. When this connection has cooled, remove the flow of nitrogen from the service
port at the liquid coupling.
Wet cloth Service valve

MS-SVN052E-EN 13
Unit Installation
4. Replace the Schraeder core once more onto the liquid and suction valves.
5. Carry out leak tests on all refrigerant line connections, including tapered valves at the service
port to ensure they are all leak-free. DO NOT OVERTIGHTEN (between 40 and 60 in.lbs
maximum).
6. Purge suction line, evaporator, and liquid line at 350 microns or less. Consult Data Sheet to learn
the appropriate sizing of liquid line.
Table 1. Recommended Size for Liquid and Suction Lines (in.)
7. Replace taps once more onto service ports. Do not remove tapered caps of service ports unless
absolutely necessary for system service tasks.
8. Release the refrigerant charge inside the system. Open both liquid and suction valves; remove
the plunger/piston cap and insert a hex wrench over the stem in order to turn it
counterclockwise until said valve stem reaches the angled retention wall.
9. Replace the plunger/piston cap once more and tighten with your fingers; give it an additional
1-1/2 turn with your fingers. The cap should be placed in order to prevent leaking.
¡WARNING!
Never try to repair soldered connections while the system is under low pressure. Such
action could provoke personal injuries. Consult “System Charging” section to verify and
register system charge values.
Interconnecting Lines
Suction and Liquid Lines
Maintain all lines duly sealed until ready for interconnection tasks.
First, carry out connections on the indoor coil.
Consult line sizing information on Table 2 and Table 3 to verify the use of correct sizes and
multipliers to determine the capacity for several diameter sizes of suction line and routing lengths.
Losses due to exposure of lines under outdoor conditions are not included.
Factory refrigerant charge for outdoor unit is sufficient for 15 feet of standard size interconnecting
liquid line.
Maximum Length for Lines
Maximum length for interconnecting lines is 160 feet.
Model Líquid Suction
24 3/8 7/8
36 3/8 7/8
48 3/8 7/8
60 3/8 7/8

14 MS-SVN052E-EN
Unit Installation
Figure 9. Piping Length Diagram #1
Always use the shortest length possible with a minimum amount of curves.
Note: Excessively long refrigerant lines produce capacity loss for the equipment.
Vertical Rise
Keep the vertical rise at a minimum. See the following guides for unit installation.
1. DO NOT exceed vertical rise as indicated in Ta b l e 3.
2. It is recommended to use the smallest allowable size for liquid line in order to minimize system
charge. This will maximize compressor reliability.
Tabl e 3 may be used to define dimensions for horizontal runs.
Outdoor
units Indoor
units
Rise
Rise

MS-SVN052E-EN 15
Unit Installation
Installation of TXV Valve
TXV Kit (thermostatic expansion valve) provided together with the equipment is for on-site
mounting. Installation of this valve must be done with tapered threaded fitting.
Figure 10. Thermostatic Expansion Valve TXV
Figure 11. Steps for TXV Kit Installation
Step 1 - Remove the fixed expansion device (calibrated orifice) mounted on the indoor unit. See
images.
Step 2 - Connect liquid line and gas line piping to the outdoor unit (brazed fitting).
Step 3 - Connect the thermostatic expansion valve TXV to the liquid line and gas line connections
coming from the outdoor unit.
Step 4 - Connect the thermostatic expansion valve TXV to the liquid line and gas line piping of the
indoor unit. Apply appropriate torque. Verify the absence of refrigerant leaks.
TXV KIT
Brazed
ĐŽŶŶĞĐƟŽŶ
Tapered
ĐŽŶŶĞĐƟŽŶ
TX
SETP 1
STEP 2
STEP 4
V
KIT
X
V
STEP 3

16 MS-SVN052E-EN
Unit Installation
Evacuation
It is required to evacuate the system at 350 microns or less. If a leak is suspect, apply dry nitrogen
to locate it. Repair the leak and repeat the leak test. To verify that the system reports no further leaks,
close the valve that goes to the suction vacuum pump; this will isolate it and will allow you to
sustain the system under a vacuum. Observe the gauge during several minutes. If reading indicates
a stable and continuous increase, it will be indicative of a leak. If the gauge indicates an increase
and after several minutes it stabilizes and remains constant, it will be indicative of a system free
of leaks but still withholding humidity. This situation will require an additional evacuation in the
event of a gauge reading above 350 microns.
Line Sizing
Table 2. Length/Dimension of Suction Line vs. Capacity Multiplier (R410A)
Table 3. Dimension of Líquid Line (R410A)
Note:
1. x Standard line size
2. N/A (application not recommended
3. Charge multiplier for additional interconnection of refrigerant line length: Líquid 3/8” 0.6oz/ft
Model Size 2 Ton 3 Ton 4 Ton 5 Ton
Suction Line Connection Size 3/8” Std. 3/8” Std. 3/8” Std. 3/8” Std.
Suction Line routing (in feet) 5/8 Opt 5/8 Opt. 3/4 Opt. 3/4 Opt.
3/4 Std. 3/4 Std. 7/8 Std. 7/8 Std.
25’ Optional1.000.990.990.98
Standard 1.00 1.00 1.00 1.00
50’ Optional0.990.980.980.97
Standard 0.99 0.99 0.99 0.99
100’ Optional0.980.950.970.95
Standard 0.99 0.98 0.98 0.97
Model Size Line Connection
Size
(inch <O.D.)
Compressor
Type
Connection Size
and Line Size
(inch O.D.)
Liquid Line Size
Outdoor Unit Above or Below Indoor Coil
Total Length Equivalent - Feet
25 50 60 100
Maximum Vertical Separation - Feet
2 Ton 3/8”x Rotating 3/4”x 25 50 45 40
5/8” 25 50 45 40
3 Ton 3/8”x Rotating 3/4”x 25 50 50 50
5/8” 25 50 50 50
4 Ton 3/8”x Rotating 7/8”x 25 50 50 40
3/4” 25 50 50 40
5 Ton 3/8”x Rotating
3/4” 25 50 50 40
7/8”x 25 50 50 40
1-1/8” 25 40 30 N/A

MS-SVN052E-EN 17
Electrical Connections
Electrical Connections
General Information and Grounding
Verify power supply to ensure compliance with data on the unit’s identification label and wiring tags.
The installer shall supply power wiring, control wiring (low voltage), disconnect switches and overcurrent
protection. All cable wiring should comply with specific requirements.
CAUTION!
All field wiring shall be of ONLY COPPER CONDUCTORS and in compliance with local, national and electrical
security codes.This unit must be grounded with a separate cable and in accordance with local, national and
electrical security codes.
Wiring diagram and wiring schematics can be found on the inside surface of the service access panel as well
as in the present manual.
Power Wiring of Field Connections
1. Install properly sized and weather proof disconnect switch outdoors and close to the unit.
2. Remove retaining screws on the side of the corner panel. Slide corner panel downwards to remove it. See
Figure 12.
3. Run power wiring from the disconnect switch to the unit
4. Direct cables from the disconnect point through the opening provided for power wiring and towards the
interior of the unit’s main control box.
5. Install properly sized time delay fuses or circuit breaker, and conduct power supply connections.
6. To save time, energize the crankcase heater (if equipped) through the reheating of compressor oil while the
remaining the remaining installation steps continue to proceed.
Note: When changing motor, first remove the top panel.
Figure 12. Typical Field Wiring
CORNER
PANEL
HIGH VOLTAGE WIRING
LOW VOLTAGE WIRING

18 MS-SVN052E-EN
Electrical Connections
Figure 13. Removal of top panel and motor
When it is necessary to change the motor, follow the steps indicated below:
Step 1: Open the electrical panel; disconnect all power to the motor.
Important:
– Disconnect power supply to the unit. Failure to follow this recommendation could
provoke severe burns and electrical shock.
Step 2: Remove top panel (be careful with motor wiring)
Step 3: Place top panel on the floor.
Important:
– Take care NOT to allow fan blades to rest on or touch the floor or against any
surface.
Step 4: Remove fan motor with the removal of all 5/16” nuts from the panel.
Step 5: Remove fan blades from motor fan with the removal of 1/2” nut and place fan on the floor.
Step 6: Invert the removal process when ready to reinstall fan and motor.
Important:
– When connecting wiring to the motor, verify the direction of the motor.
1/2” nut
5/16” nuts
If fan nuts are removed before removal of top panel,
it will harm the condensing unit.
NOTE:

MS-SVN052E-EN 19
System Operation
System Operation
Control Logic Description
The variable speed system adopts the same 24VAC control as conventional heat pumps.
Compressor speed is controlled according to coil pressures monitored by the pressure transducer.
In order to ensure stable and appropriate capacity, compressor speed is modulated in accordance
with evaporator pressure during the cooling mode, and in accordance with condensing pressure
during the heating mode. Nominal pressure can be adjusted automatically at the SW4 switch to
reach optimized compressor operational capacity, as well as to satisfy higher dehumidifying and
capacity demands.
SW4
Sensor
T3 (Outdoor coil temperature) and T4 (indoor temperature
heat pump only).
T5 (Compressor discharge temperature and Tf (IPM radiator temperature)
Pressure Transducer.
Sensor Description
T3 temperature sensor is used for:
– Protection during system operation (high/low coil temperature)
– Outdoor fan control (cooling)
– Defrost (heat pump only)
– Forecasting environment temperature (cooling only)
T4 sensor is required (heat pump only) for:
– Enabling system operation according to outdoor temperature
– Indicating one of the conditions for enabling defrost cycle
– Outdoor fan control (heating mode heat pump only)
T5 sensor is required for:
– Operational protection (high/low temperature)
– Control of outdoor electronic expansion valve (heat pump only)
ON
OFF 1234
SW4-1 Not Used
SW4-2 Not Used
SW4-3
ON Adaptive capacity output
disable
OFF Adaptive capacity output
enable
SW4-4 ON Accelerated cooling/heating
OFF Normal cooling/heating

20 MS-SVN052E-EN
System Operation
Tf sensor is required for:
– Protection against module temperature (high temperature)
A pressure transducer (PT) is required for:
– Operating speed control
– Outdoor electronic expansion valve (heat pump only)
– High pressure protection (heating mode heat pump only)
– Low pressure protection (cooling mode)
Defrost Description (Heat Pump Only)
Defrost control (when ordered) measures coil temperature with the use of a sensor located on the
heat pump coil. In order to measure outdoor ambient temperature, a second sensor is located on
the outside of the outdoor coil.
Defrost cycle starts with the reading of various parameters, i.e., outdoor unit coil temperature (T3
temperature sensor), outdoor environment temperature (T4 temperature sensor), cummulative
time of operation, coil temperature and high pressure (when high pressure is found to be lower
than a specific value).
Defrost cycle starts under one of 3 conditions as follows:
1. When temperature differential (Delta T) between outdoor temperature (T4) and coil
temperature (T3) reaches a duration of 5 minutes, that is:
•T4 ≥39ºF, Delta T = 18ºF
•T4 ≥30ºF, Delta T = 16ºF
•T4 ≥19ºF, Delta T = 14ºF
•When T4 ˂19ºF, T3 ˂9ºF
2. When minimum time of operation (MRT) based on outdoor temperature is for example:
•MRT - 4 hour duration when: T4 ˂23ºF
•MRT - 2 hour duration when: 23ºF ≤T4 ˂42ºF
3. When saturation temperature descends below 82ºF during a period of 20 minutes.
Defrost cycle ends under the following conditions:
1. When outdoor coil temperature (T3) reaches 64ºF during a period of 1 minute or when defrost
period exceeds 8 minutes.
2. The adjustment of SW5 switch offers various defrost cycle options depending upon
geographical conditions and/or outdoor area conditions.