Trane Arctic Thermafit AXM Installation and operating instructions

SAFETY WARNING
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.
August 2022 ARTC-SVX006A-EN
Installation, Operation, and Maintenance
Thermafit™ Air-to-Water Heat Pump
Model AXM

©2022 ARTC-SVX006A-EN
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
Indicates a potentially hazardous situation which, if
not avoided, could result in death or serious injury.
CAUTION
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.
NOTICE
Indicates a situation that could result in equipment
or property-damage only accidents.
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.
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
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 (Examples; cut resistant gloves/
sleeves, butyl gloves, safety glasses, hard hat/
bump cap, fall protection, electrical PPE and arc
flash clothing). ALWAYS refer to appropriate
Safety Data Sheets (SDS) and OSHA guidelines
for proper PPE.
• When working with or around hazardous
chemicals, ALWAYS refer to the appropriate
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.

ARTC-SVX006A-EN 3
WARNING
Follow EHS Policies!
Failure to follow instructions below could result in
death or serious injury.
• All Trane personnel must follow the company’s
Environmental, Health and Safety (EHS) policies
when performing work such as hot work,
electrical, fall protection, lockout/tagout,
refrigerant handling, etc. Where local
regulations are more stringent than these
policies, those regulations supersede these
policies.
• Non-Trane personnel should always follow local
regulations.
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 written permission. 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.
Introduction

4ARTC-SVX006A-EN
Model Number Descriptions . . . . . . . . . . . . . . . . . . 6
Model Number and Coding. . . . . . . . . . . . . . . . . . 6
Heat Pump Model and Serial
Numbers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Model Coding Key . . . . . . . . . . . . . . . . . . . . . 6
Heat Pump Description . . . . . . . . . . . . . . . . . . . . . . 7
Heat Pump Scope . . . . . . . . . . . . . . . . . . . . . . . . . 7
Heat Pump Capacities. . . . . . . . . . . . . . . . . . . . . . 7
Component Description . . . . . . . . . . . . . . . . . . . . 7
Pre-Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Preparation for Initial Startup . . . . . . . . . . . . . . . . 9
Initial Startup . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Installation Mechanical. . . . . . . . . . . . . . . . . . . . . . 12
Inspect and Report Damage . . . . . . . . . . . . . . . 12
Inspection of Delivered Equipment . . . . . . 12
Warranty Issues . . . . . . . . . . . . . . . . . . . . . . 12
Long Term Storage Requirements . . . . . . . . . . 12
Factory Preparation . . . . . . . . . . . . . . . . . . . 12
Customer Responsibilities. . . . . . . . . . . . . . 12
Handling of the Modules . . . . . . . . . . . . . . . . . . . 13
Site Preparation and Clearances. . . . . . . . . . . . 13
Heat Pump Clearances . . . . . . . . . . . . . . . . 13
Minimum Clearances . . . . . . . . . . . . . . . . . . 13
Service Access . . . . . . . . . . . . . . . . . . . . . . . 14
Rigging, Lifting, and Moving the Heat
Pump................................... 15
Mounting Rails . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Installation Piping. . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Install Piping and External
Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Initial Flushing of Piping . . . . . . . . . . . . . . . . . . . 17
Fill with Water/Glycol Solution . . . . . . . . . . 17
Connecting Module Couplings . . . . . . . . . . 17
Installation Electrical . . . . . . . . . . . . . . . . . . . . . . . . 18
Connecting Module Power and Control
Wires . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Heat Pump Module Main Power. . . . . . . . . 18
Phase Monitor Installation . . . . . . . . . . . . . . 18
Power Interlock Switch. . . . . . . . . . . . . . . . . 18
Module Control Wiring . . . . . . . . . . . . . . . . . 18
Operating Principles . . . . . . . . . . . . . . . . . . . . . . . . 19
Minimum Fluid Volume and Avoidance of
Short Loops. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Operating Procedures . . . . . . . . . . . . . . . . . . . . . . 20
Operator Interface . . . . . . . . . . . . . . . . . . . . . . . . 20
Heat Pump Power Panels . . . . . . . . . . . . . . 20
Panel-Mounted Disconnect
Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Power Distribution Panels . . . . . . . . . . . . . . 20
Module Electrical and Control
Panel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Electronic Control . . . . . . . . . . . . . . . . . . . . . 21
Controllers . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Operating the Microprocessor . . . . . . . . . . 22
Microprocessor Functions . . . . . . . . . . . . . . 22
Password Protection . . . . . . . . . . . . . . . . . . 22
Operator Control . . . . . . . . . . . . . . . . . . . . . . 22
Touchscreen Interface Panel . . . . . . . . . . . 23
Touchscreen Interface Tutorial. . . . . . . . . . . . . . 23
Interface Menu Structure . . . . . . . . . . . . . . . . . . 24
Home Screen Features . . . . . . . . . . . . . . . . . . . . 24
HMI Functions . . . . . . . . . . . . . . . . . . . . . . . . 25
Modules Layout Screen . . . . . . . . . . . . . . . . . . . 26
Module Layout Screen Status
Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Active Alarms Screen. . . . . . . . . . . . . . . . . . 27
Alarm History . . . . . . . . . . . . . . . . . . . . . . . . . 28
Modules Overview Screens . . . . . . . . . . . . 29
Overview Module . . . . . . . . . . . . . . . . . . . . . 30
Overview Circuits . . . . . . . . . . . . . . . . . . . . . 31
Module I/O Screens . . . . . . . . . . . . . . . . . . . . . . . 31
Analog Inputs. . . . . . . . . . . . . . . . . . . . . . . . . 32
Analog Outputs . . . . . . . . . . . . . . . . . . . . . . . 33
Digital Inputs . . . . . . . . . . . . . . . . . . . . . . . . . 33
Digital Outputs. . . . . . . . . . . . . . . . . . . . . . . . 33
Expansion IO Screen . . . . . . . . . . . . . . . . . . 34
Modules Trend Screen. . . . . . . . . . . . . . . . . 34
Operator Tasks . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Normal Power Up . . . . . . . . . . . . . . . . . . . . . 35
Emergency Power Shutdown. . . . . . . . . . . . . . . 35
Water Quality Guidelines . . . . . . . . . . . . . . . . . . 36
Monitor Water Quality . . . . . . . . . . . . . . . . . . . . . 36
Table of Contents

ARTC-SVX006A-EN 5
Maintain Glycol Level . . . . . . . . . . . . . . . . . . 36
Prevent Freezing. . . . . . . . . . . . . . . . . . . . . . 37
Controls Interface. . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Microprocessor Control System. . . . . . . . . . . . . 39
Primary Microprocessor Controller . . . . . . 39
Secondary Microprocessor
Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Touchscreen Interface Panel . . . . . . . . . . . 39
Operator Control and Monitoring . . . . . . . . 39
Heat Pump Control . . . . . . . . . . . . . . . . . . . . . . . 39
Power Distribution. . . . . . . . . . . . . . . . . . . . . 39
Electrical Controls. . . . . . . . . . . . . . . . . . . . . 40
Refrigeration Controls . . . . . . . . . . . . . . . . . 41
Sequence of Operations . . . . . . . . . . . . . . . . . . . . 43
Bank Controls Sequence . . . . . . . . . . . . . . . . . . 43
Heat Pump Performance Data. . . . . . . . . . . . . . . 45
Maintenance Procedures . . . . . . . . . . . . . . . . . . . 47
Maintenance Strategy . . . . . . . . . . . . . . . . . . . . . 47
Federal Clean Air Act . . . . . . . . . . . . . . . . . . . . . 47
Inspection and Maintenance Schedule. . . . . . . 47
Daily . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Weekly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Monthly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Quarterly . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Annually . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Maintenance Tasks . . . . . . . . . . . . . . . . . . . . . . . 50
Inspection Methods . . . . . . . . . . . . . . . . . . . 50
Critical Cleaning Tasks. . . . . . . . . . . . . . . . . 51
Compressor Tasks . . . . . . . . . . . . . . . . . . . . 52
Controller Tasks . . . . . . . . . . . . . . . . . . . . . . 53
Heat Pump Troubleshooting. . . . . . . . . . . . . . . . . 54
General Approach to Fault Isolation . . . . . . . . . 54
Controller Diagnostic Codes. . . . . . . . . . . . . . . . 54
Compressor Diagnostic Codes . . . . . . . . . . . . . 56
KRIWAN Flash Codes . . . . . . . . . . . . . . . . . 56
Phase Monitor Protection . . . . . . . . . . . . . . . . . . 57
Symptoms and Solutions . . . . . . . . . . . . . . . . . . 57
Logical Flow Diagrams. . . . . . . . . . . . . . . . . . . . . . 62
High Voltage Logical Flow . . . . . . . . . . . . . . . . . 62
Control Logical Flow . . . . . . . . . . . . . . . . . . . . . . 62
Refrigeration Logical Flow . . . . . . . . . . . . . . . . . 64
Acronyms and Abbreviations . . . . . . . . . . . . . . .A–1
Acronym List . . . . . . . . . . . . . . . . . . . . . . . . . . . . A–1
Request for Initial Startup . . . . . . . . . . . . . . . . . .B–1
AXM Air-to-Water Heat Pump . . . . . . . . . . . . . B–1
Initial Startup Agreement . . . . . . . . . . . . . . . . . B–2
Table of Contents

6ARTC-SVX006A-EN
Model Number Descriptions
Model Number and Coding
When contacting Trane for technical support, customer
service, or parts information, be prepared to provide the
model number and serial number of the heat pump
modules in question. This information is located on the blue
plastic heat pump nameplate that is affixed to each module.
Heat Pump Model and Serial Numbers
For future reference, record the model number and serial
number for each module in the heat pump in the table
below, Heat Pump Reference Data. Refer to the Trane
nameplate on each module in the installed unit for the
serial number and model number.
Table 1. Heat pump reference data
Module Model Number Serial Number
1
2
3
4
5
6
7
8
9
10
Model Number
Critical information for contacting Trane technical support.
Reference to the actual heat pump module serial number
may also be beneficial. Each module has its own unique
serial number.
Model Coding Key
Model numbers assigned to Trane systems provide a
wealth of information about the features for a heat pump’s
“as-built” configuration.

ARTC-SVX006A-EN 7
Heat Pump Description
Heat Pump Scope
This manual provides relevant data to properly operate,
maintain, and troubleshoot the Trane AXM air-to-water
modular heat pump. Operator and maintenance personnel
must be a qualified refrigeration technician and have a
working knowledge of high voltage systems, low voltage
control circuits, and components and functions.
Heat Pump Capacities
The AXM Heat Pump model is available in 30 nominal ton
capacity modules. A minimum of 2 and up to 10 modules
may connect together in a standard primary/secondary
control system. The system consists of a primary heat
pump module that contains the primary microprocessor
controller, the power distribution panel, and one or more
secondary modules. It is important to connect modules in
the correct sequence as detailed in Handling of the
Modules section of the Installation Mechanical chapter.
The AXM heat pump uses independent refrigeration
circuits in each module with each vapor injected scroll
compressors. Models are available with brazed- plate load
heat exchangers. The brazed-plate heat exchanger is
typically made of SAE Grade 316 stainless steel and 99.9%
copper brazing materials. Standard interconnecting
headers are composed of carbon steel.
Water quality must be monitored and maintained by a
water treatment professional familiar with the materials of
construction and operation of the equipment. The heat
pump modules arrive fully charged with refrigerant. As
required under Federal regulations, installation, initial start-
up, and technical servicing should only be performed by
fully qualified personnel.
WARNING
Hazardous Voltage!
Failure to disconnect power before servicing could
result in death or serious injury.
Disconnect all electric power, including remote
disconnects before servicing. Follow proper lockout/
tagout procedures to ensure the power can not be
inadvertently energized. Verify that no power is
present with a voltmeter.
Component Description
Every heat pump module is comprised of five basic
components: compressor, load heat exchanger, expansion
valves, reversing valves, and air coils. Each heat pump
module contains one or more of these primary refrigeration
components.
Vapor Injected Scroll Compressor
An enhanced vapor injection scroll compressor is provided on each
refrigeration circuit for greater heating performance in low ambient
temperatures.
Dual independent refrigeration circuits provided in each module each with
Rotalock connections for compressor isolation, oil level sight glass,
suction gas-cooled motor with solid-state sensors in the windings for
overload protection, and circuit breaker protection. There shall be two
independent compressors and refrigerant circuits per module.
Compressors shall be mounted to the formed sheet metal frame with
rubber-in-shear vibration isolators.

8ARTC-SVX006A-EN
Load Heat Exchanger
Each module contains a brazed plate heat exchanger constructed with
SAE Grade 316 stainless steel corrugated channel plates with copper filler
material between each plate. The filler material forms a brazed joint at
every contact point on the plates creating complex channels. This allows
fluid to come into close proximity of the cold refrigerant, separated only by
channel plates, thereby efficiently cooling the fluid to the required
temperature. Interconnecting pipe headers between modules are
schedule 10 carbon steel.
Heat Pump Description

ARTC-SVX006A-EN 9
Pre-Installation
Preparation for Initial Startup
After the system is completely installed with all wires
connected and all piping securely coupled, the heat pump
can be prepared for initial startup.
Ensure there is a sufficient cooling or heating load available
for proper testing of the heat pump system.
WARNING
Hazardous Voltage!
Failure to disconnect power before servicing could
result in death or serious injury.
Disconnect all electric power, including remote
disconnects before servicing. Follow proper lockout/
tagout procedures to ensure the power can not be
inadvertently energized. Verify that no power is
present with a voltmeter.
Initial Startup
1. Close all drain valves and header purge valves.
2. Fill the heat pump with clean water/glycol mixture.
3. Inspect all connections for leaks during the filling
process.
4. De-energize heat pump using industry-standard
lockout/tagout procedures. Verify main power is turned
off at the power distribution panel. Validate de-
energization using voltage meter.
5. Inspect all electrical connections to ensure terminals
are secure.
6. Inspect all fuses and overload settings to ensure they
conform to specifications.
7. Inspect all refrigerant pressures for each module to
ensure no refrigerant has been lost.
8. Check that pressure switches and thermostats have
correct “cut-in” and “cut-out” settings.
9. Confirm the oil level is correct in each compressor.
NOTICE
Compressor Failure!
Failure to follow instructions below could result in
catastrophic compressor failure.
Do not operate with insufficient oil.
10. Connect phase monitor wiring, if required.
11. Connect remote flow switch if the heat pump is so
equipped.
12. Ensure refrigerant valves are open at the compressors.
13. Confirm that pressure and temperature switches are in
the closed position.
14. Apply power to all modules in the heat pump.
15. Turn on the condenser and evaporator fluid pumps and
ensure there is proper flow and the pressure drop
across the system is as expected.
16. Monitor and record all temperatures and refrigerant
pressures.

10 ARTC-SVX006A-EN
Table 2. Initial startup readiness checklist
☐☐ Startup Readiness Dimension
☐
Describe voltage service:
☐Fused disconnect
☐Non-fused disconnect
☐50 Hz
☐60 Hz
☐
Record rated power supply: __________volts_______ phase
• Circuit breaker rating: _______
☐Record supply voltage on Heat Pump nameplate: _________________
☐Record power supply voltage to ground: L-1= _______, L-2 = _______, L-3 = _______
☐
Record voltage between each phase: L-1 to L-2 = ______, L-2 to L-3 = ______, L-1 to L-3 = ______
☐Agrees with nameplate values?
☐Voltages must be within 2%.
☐Check the box if all electrical connections inside the power distribution panel are tight.
☐
Check the box if all electrical connections inside each module electrical and control panel are tight. Ensure all components inside each module are
securely mounted and have not shifted during shipment.
☐Record the control voltage between TB-1-1 and TB-2-1: ________
☐
Check the box if heat pump system includes any remote panels (city water switchover, remote control panel, or customer supplied control devices). If so,
voltage drops are likely to occur. Measure and record all control voltages:
List devices: Voltage 1=_____________________ Voltage 2=_____________________ Voltage 3=___________________
☐Check the box if there are any field-supplied wiring junction boxes located between the heat pump and any remote panels.
☐Check the box if there are any splices made in the field-supplied wiring junction boxes.
☐
Check the box if there are any customer-supplied devices connected to the heat pump wiring.
List devices: ______________________________________________________________________________________
☐Check the box if there are any Trane remote devices connected to the heat pump wiring.
☐Check the box if voltage drops are detected.
☐Check the box if the appropriate water/glycol mixture has been added to the heat pump.
☐Check the box if all Heat Pump modules are installed with minimum clearances available from all sides.
☐Check the box if refrigeration gauges are indicating equal refrigerant pressures.
☐Check the box if chilled water lines from Heat Pump to customer’s equipment are permanently connected.
☐Check the box if chilled water lines have been flushed clean of mud, slag, and other construction debris.
☐Check the box if all chilled water line filters and strainers are clean.
☐Check the box if chilled water lines have been leak tested according to pre-startup instructions.
☐Check the box if heat pump reservoir (if included) is at operating level with correct water/glycol mixture.
Pre-Installation

ARTC-SVX006A-EN 11
Table 2. Initial startup readiness checklist (continued)
☐☐ Startup Readiness Dimension
☐Check the box if high voltage wiring is installed, tested, and functional.
☐Check the box if all water, refrigeration, and electrical connections between heat pump modules are completed.
☐Check the box if all control wiring between modular heat pumps is installed, tested, and functional.
☐Check the box if control wiring is complete, including any additional remote interface panel or special-purpose wiring.
☐
Check the box if all responsible installing contractors and sub-contractors have been notified to have representatives available on site to provide technical
support for the initial start-up procedure.
☐Check the box if full load will be available for heat pump on the initial start-up date.
☐
Touchscreen Interface Panel: Record version and date of the software loaded into the touchscreen interface panel:
Version: ____________________________________ Date: ________________
Note: To view the software version, from the home screen, press the software button on the System Control screen.
Startup
As part of a continuous commitment to quality, initial startup
of this Heat Pump must be done by Trane.
Pre-Installation

12 ARTC-SVX006A-EN
Installation Mechanical
Inspect and Report Damage
Upon receipt, inventory the shipment against the Trane bill
of lading to ensure all modules and components have been
delivered.
Inspect each package in the shipment for visible damage.
Verify the correct model number and that all skids and
cartons have been delivered. Any damage must be
reported to the motor carrier and Trane within five days of
receipt of the shipment.
Inspect all exterior components for concealed damage as
soon as possible. Do not proceed with the installation of
damaged equipment without prior approval of Trane.
Do not refuse delivery of damaged goods without prior
authorization.
Inspection of Delivered Equipment
To report damage incurred in transit, complete the
following:
1. Inspect each piece of equipment for visible damage
before accepting delivery. Check for torn cartons,
broken skids, bent metal and torn shrink wrap.
2. Ensure the delivery driver notes any damage on the bill
of lading and completes a Carrier Inspection Report.
Failure to comply may result in difficulties in resolving
any claims for damage.
3. Inspect each piece of equipment for concealed damage
before storage or as soon as possible after delivery.
4. In the event of suspected concealed damage, ask the
driver to wait until you inspect the equipment.
Concealed damage must be reported within five days
of receipt of equipment.
5. If concealed damage is found, stop unpacking the
shipment. Do not remove damaged material from the
receiving location, take photos of the damage. The
owner must provide reasonable evidence that the
damage did not occur after delivery.
6. Notify the carrier of the damage as soon as possible.
Request an immediate joint inspection by the carrier
and consignee. A determination of responsibility will be
made and the carrier will authorize repairs in the event
of admission of fault.
7. Notify your local Trane CSO immediately. Trane will
coordinate repairs with the carrier. Do not attempt to
make repairs locally without permission.
Warranty Issues
Trane is not responsible for damages or for filing damage
claims. It is the customer’s responsibility to ensure that the
necessary long term storage procedures have been
completed and any deviations are reported to Trane
immediately.
Long Term Storage
Requirements
Appropriate preparation and storage of Trane heat pump
components during extended periods of dormancy is
essential to ensure the equipment does not sustain
damage or degradation due to inactivity and operates
properly after installation.
The customer must notify Trane during the sales process
that the heat pump system may be transported by ocean
freight or placed in long-term storage under any of these
conditions:
• The heat pump will not be placed into operation for a
period exceeding six months after leaving the Trane
factory. That is, the initial start-up date will not occur
within a six-month maximum dormancy window.
• The heat pump will be shipped using ocean transit for
all or part of the delivery process.
• Cold temperature storage conditions fall below -20 °F
(-29 °C).
• Ambient temperature storage conditions exceed 150 °F
(66 °C).
Factory Preparation
Upon confirmation of an order requiring long-term storage
or protection against extreme environments, Trane will
inspect and protect vendor-supplied components before
installation.
Prior to shipment, Trane will prepare each heat pump
system for long-term storage in coastal or tropical
environments by:
• Placing silica gel packs in all electrical panels and
variable speed drive panels to prevent corrosion of
electrical contacts and moisture from degrading
sensitive controllers.
• Shrink-wrapping each heat pump using polyethylene
film to limit environmental exposure and protect the
Heat Pumps from damage during shipping.
• For multiple modular heat pump system assemblies
shipped on a common skid, shrink wrap the entire skid
rather than the individual modules.
Trane will document and photograph the status of the unit
prior to shipment and carry out the instructions detailed in
the factory order regarding in-shop preparation of units for
long-term storage.
Customer Responsibilities
Upon receipt of a heat pump system, the customer must
conduct thorough internal and external inspections,
removing packaging material as needed for access to all
components.
Visible damage must be noted on the signed and dated bill
of lading. The customer may request a carrier inspection by

ARTC-SVX006A-EN 13
telephone or in person, but any such request should be
confirmed in writing. It is recommended that the customer
request that the carrier inspect the damage within 72 hours
of notification.
The customer must store the heat pump system in a dry,
non-corrosive, dust- and vibration-free environment due to
the exposure sensitivities of the microprocessor controllers
and to prevent electrical terminations from deteriorating
from non-use. Conditions in storage locations should not
fall below -20 °F (-29 °C) or exceed 150 °F (66 °C).
Components sealed in plastic shrink-wrap are not exempt
from these storage requirement. Moisture can potentially
collect inside the plastic film, resulting in corrosion of the
cabinet and electronic components. Any heat pump system
packaging that is removed must be replaced with similar
protective covering as soon as possible.
Failure to adhere to these long-term storage requirements
may void the Trane warranty. Any component that is
damaged or inoperable due to improper storage may have
its warranty voided.
Handling of the Modules
The packaging from the factory permits lifting with a
suitable crane. Ensure straps are in good working condition
and that they are rated for the weight of the machines.
Spreader bars may be required for effective rigging and to
avoid damage to the heat pump modules.
The heat pump modules arrive fully charged with
refrigerant. As required under Federal regulations,
installation, start-up and service should be performed by
fully-qualified, factory-certified, personnel.
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
Electrical Shock, Explosion, or Arc
Flash Hazard!
Failure to follow these instructions could result in
death or serious injury.
• Install the product in an appropriate electrical/
fire enclosure per local regulations. Do not
install the product in hazardous or classified
locations.
• Do not use the product for life or safety
applications.
• Do not exceed the product ratings or maximum
limits. Products rated only for basic insulation
must be installed on insulated conductors.
• Current transformer secondaries (current mode)
must be shorted or connected to a burden at all
times.
• Remove all wire scraps, tools, replace all doors,
covers and protective devices before powering
the equipment.
Site Preparation and Clearances
Heat pump modules must be installed on a level surface
that has been checked by a qualified structural engineer to
support the weight of the fluid-filled modules and the
connective piping to and from the heat pump. Installations
must account for minimum service access clearances as
may be practical or required by local building codes.
Heat Pump Clearances
One of the most critical factors affecting the performance of
air-to-water heat pump is air flow above and around the
heat pump modules. Walls, roofs, overhangs, and nearby
mechanical heat sources can all degrade heat pump
performance. The further heat pump is from such
obstacles, the more efficiently it will operate.
Minimum Clearances
The unit must maintain clearance on all sides to provide for
adequate ambient air circulation. See Figure 1, p. 14.
The air coils are designed for outdoor installation and must
be mounted level on a roof or concrete slab that is strong
enough to support the total equipment operating weight.
Consult a professional structural engineer to determine
safe mounting loads.
Unrestricted airflow must be provided to air coils. Avoid air
recirculation from other nearby equipment. Locate the air
coils away from building air vents and heat sources such as
exhaust fans.
The unit should be located far enough away from any wall
or other obstruction to provide adequate clearance for
ambient air intake and discharge:
Installation Mechanical

14 ARTC-SVX006A-EN
There should be no obstruction above the heat pump
module to interfere with fan discharge of heated air. Even a
partial overhang of an eave or awning can trap hot air and
significantly degrade heat pump performance.
Each heat pump module must be as far away from any wall
or barrier as space allows. Sufficient clearance must be
maintained between the heat pump modules and any walls
or other objects that can interfere with the free flow of air to
the air coils.
Screening fences must have 50% open surface area, with
one foot of bottom clearance, and must not extend higher
than the top of the fan grill. Modules should be a minimum
of three feet away from any fence. Failure to follow these
minimum requirements may result in performance
degradation.
Modules located in a sub-level or pit require special
considerations to avoid air recirculation.
Do not attach ductwork to any fan or fan shroud. Contact
product support for guidance on any potential ducting
applications.
Refrigerant piping should be sufficiently flexible to prevent
transmission of noise and vibration into the building.
If the desired location for the heat pump is confined by
walls, fences, overhanging roof eaves, or is located in a pit
(sub-level site), contact Trane to discuss potential impact
on equipment performance.
The National Electric Code or local, state, and regional
building codes may require greater clearance for the
modular heat pump than the figures listed in this
publication. Always consult local regulatory agencies to
ensure additional clearances are not required by building
codes.
Service Access
Clearance must be maintained between the module and
any nearby wall or impediment to provide sufficient room to
access power distribution panel and electrical and control
panels for routine maintenance and servicing. 36 to 48
inches of clearance is required to meet local and national
electrical codes. Compressors, filter-strainers, and liquid
line shutoff valves are accessible from any service access
panel.
Figure 1. Recommended heat pump clearances
Note: These clearances are general recommendations.
Each installation has specific considerations.
Contact Trane for definitive guidance and approval
on a job-by-job basis.
Installation Mechanical

ARTC-SVX006A-EN 15
Rigging, Lifting, and Moving the
Heat Pump
The air-to-water modular heat pump can be delivered to the
customer’s site as individual modules or as factory
assembled single units, depending on customer
requirements and preferences. Limitations on the methods
and materials that can be used to rig, lift, or move a heat
pump or an individual module include:
• Maintain the module in an upright position at all times.
• Certain configurations of modules can be top-heavy.
Move modules slowly with consideration for each
module’s center-of-gravity.
• Rig, lift, and move by strapping and lifting using a
properly configured floor jack or fork lift or by overhead
means.
• Position lifting beams to prevent lifting straps from
rubbing or contacting module side panels or electrical
boxes.
• Do not use cables, chains, or any other type of
metalized strapping to lift a module.
• Do not push a heat pump module while directly in
contact with the floor using manual or mechanical
means.
Figure 2. Recommended heat pump rigging
Installation Mechanical

16 ARTC-SVX006A-EN
Mounting Rails
The heat pump must be positioned on a firm, level surface.
When modules are installed onto structural steel rails, the
rails must be level such that the modules are properly
aligned. Mounting rails must be a minimum of 4 inches
wide. Custom modules may have different requirements.
Consult submittal drawings to confirm dimensions. See
Figure 3, p. 16.
All of the modules arrive with labels on the electrical and
control panel. Review the installation drawings to
determine which is the first, primary, module. Typically the
primary module also has the power distribution panel
attached to it.
Figure 3. Heat pump installation on mounting rails
While the compressors are installed with rubber-in-shear
isolation pads, for additional vibration isolation, spring
isolators may be installed under the structural steel
mounting rails.
When installing modules directly onto a concrete pad,
rubber-in-shear isolator pads may be installed under each
module.
After setting each module, remove front or rear service
panels to improve access to components when making
connections.
Installation Mechanical

ARTC-SVX006A-EN 17
Installation Piping
Install Piping and External
Components
Proper support of piping and pipe hangers must consider
the weight of the piping as well as the water weight inside
the pipes. A 40-mesh screen strainer must be installed in
each water/liquid system piping inlet for proper filtration an
protection of the heat exchangers. The following figure
provides a recommended installation of components.
Figure 4. Recommended heat pump piping
Initial Flushing of Piping
After installation of system piping and before connection to
the heat pump system, it is important to clean and remove
debris, weld slag, and other contamination deposited
during fabrication of the piping system.
Important: Do not flush through the heat pump modules.
Typical flushing includes hot water with mild detergent
followed by a dilute phosphoric acid solution until all visible
residue is removed.
Only cleaning liquids, acids, and detergents compatible
with SAE Grade 316 stainless steel, copper, and carbon
steel should be used. Consult a professional water
treatment specialist when in doubt.
Flushing should take place across a filter/strainer with a
maximum 30 mesh screen and continue for a minimum of
six hours with frequent removal of the screen to capture
residue or until the strainer is clean.
After detergent and chemical cleaning, flush the water
piping with fresh water for one hour to remove any
remaining cleaning compounds.
Fill with Water/Glycol Solution
The installing contractor is responsible for charging glycol
into the heat pump hydronic system.
1. Mix the concentrate of propylene glycol in a tank or
drum for transfer into the heat pump. Use Table 7, p. 37
to determine the appropriate glycol concentration for
the heat pump.
2. Mix the glycol and water externally before filling the
heat pump to prevent clogging of the heat pump piping
with a heavy concentrate.
Only after the above steps have been completed should
the water piping be connected to the heat pump system.
Dowfrost
Important: Dowfrost inhibited propylene glycol-based
solution is listed as chemically acceptable by
the US Department of Agriculture (USDA).
The two ingredients in Dowfrost water/glycol
mixture are generally recognized by the FDA
as safe food additives under Parts 182 and
184 of the Food Additive Regulations.
Connecting Module Couplings
Install each module according to its position number
indicated on its electrical distribution cabinet. Install the
primary module first. Each secondary module has the
same installation procedure as the previous module.

18 ARTC-SVX006A-EN
Installation Electrical
Connecting Module Power and
Control Wires
Connections are made at the primary module, which
typically contains the power distribution panel .
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.
Heat Pump Module Main Power
Modular systems feature single-point power connection
from the utility service to the power distribution panel on the
primary module as standard. Main power phases A, B, and
C are connected to terminals A, B, and C respectively from
left to right. Some systems have individual power supplied
to each module in lieu of single point power.
Phase Monitor Installation
The heat pump is equipped with a phase monitor on the
power distribution panel. It communicates with the primary
microprocessor controller on the primary module electrical
and control panel via the ID8 terminal. Ensure that the
wiring from the primary microprocessor controller and
terminal blocks to the phase monitor are connected and
secure.
The phase monitor continuously monitors each of the three
phases. The microprocessor receives input from the phase
monitor indicating whether the voltage is within acceptable
values. The phase monitor is designed to protect against
under-voltage, voltage imbalance, phase loss, and phase
reversal.
Set voltage adjustment knob at the desired operating line
voltage for the equipment. This adjustment automatically
sets the under-voltage trip point. Check the phase monitor
after initial startup. If it fails to energize, (the LED glows red
or blinks) check the wiring of all three phases, voltage, and
phase sequence. If phase sequence is incorrect, the LED
flashes green/red. To correct this, swap any two line
voltage connections at the mounting socket. No further
adjustment should be required.
Power Interlock Switch
Some air-to-water heat pump systems are optionally
equipped with a panel-mounted disconnect switch installed
on the outside of the power distribution panel. The
disconnect switch must be turned to the off position before
the panel can be opened for service.
WARNING
Hazardous Voltage!
Failure to disconnect power before servicing could
result in death or serious injury.
Disconnect all electric power, including remote
disconnects before servicing. Follow proper lockout/
tagout procedures to ensure the power can not be
inadvertently energized. Verify that no power is
present with a voltmeter.
Single Point Connections
For systems with single point power connections, detach
the power cable on each module by cutting the wire tie
installed for shipping.
1. Uncoil the power cable and snake it through each
module to reach the power distribution panel.
2. Feed the taped end of the cable through the round
opening on the extreme left of the power distribution
panel.
3. Remove the tape and connect and tighten the cable
ends to the breaker corresponding to the module
number being connected. (For example, connect the
cable for module #9 to the breaker labeled #9.)
4. Connect the green ground lead to the ground lug at the
base of the enclosure.
5. Do not secure the ground wire until all of the ground
wires are connected to the ground lug and then each
can be tightened.
6. After connection, secure all power cables with standard
wire ties.
Module Control Wiring
The primary controller communicates with the secondary
controller in each heat pump module via a communication
circuit. Each secondary controller is wired back to the
Ethernet switch on the primary microprocessor controller.

ARTC-SVX006A-EN 19
Operating Principles
A typical HVAC system has a cooling requirement in the
summer and shoulder seasons and a heating requirement
in the winter and shoulder seasons. A modular air-source
heat pump system provides an efficient means to address
varying cooling and heating demands. The heat pump
system can be sized for the greater of the cooling or
heating demand. When the smaller of the demands is
operating, not all modules operate thereby saving energy
costs and improving efficiency. This also allows for the non-
operating modules to be on standby should any of the
operating modules require servicing. When the HVAC
system demand switches between heating and cooling, the
refrigeration cycle in each operating module is reversed to
produce the required heating or cooling requirement. The
air-source heat pump system does not simultaneously heat
and cool; it produces either heating or cooling depending
on the commanded mode of operation. The ambient air
provides the heat source in heating mode where the air coil
operates as an evaporator and a heat sink in cooling mode
when the air coil operates as a condenser. When operating
in heating mode in colder climates, frost will likely form on
the air coils. The heat pump modules will periodically
defrost the coils by reversing the refrigerant cycle. Modules
are sequentially defrosted to minimize the impact to
heating capacity. The defrost cycle must be considered
when sizing the hydronic system volume to ensure heating
supply capacity.
Minimum Fluid Volume and
Avoidance of Short Loops
Adequate system fluid volume is an important system
design parameter because it provides for stable fluid
temperature control and helps limit unacceptable short
cycling of compressors. The heat pump system
temperature control sensors are located in the supply
(outlet) and return (inlet) fluid connections to the building
piping. This location allows the building piping system
volume to act as a buffer to slow the rate of change of the
system fluid temperature. If there is not a sufficient volume
of fluid in the system to provide an adequate buffer,
temperature control can suffer, resulting in erratic system
operation and excessive compressor cycling. The situation
can be more severe during the heating operation when
individual modules switch to defrost mode. The modules on
defrost mode not only stop providing heating capacity, but
they also cool down the circulating hot fluid, increasing the
heating demand and potentially causing a drop in hot fluid
temperature. The defrost cycle can take 3 to 5 minutes to
complete. A minimum of fifty times a module capacity or
four-minute full load water circulation, whichever greater, is
the recommended fluid system volume. So, as an example,
for five 30 nominal ton ASHP bank, 30T x 50 = 1,500
Gallons. Assuming 2.4 gpm per ton for full load flow
rate,150 x 2.4 x 4 = 1,440 Gallons. So, the greater value of
1,500 Gallons is recommended.

20 ARTC-SVX006A-EN
Operating Procedures
Operator Interface
The modular heat pump units, whether they are composed
of a single module or up to 10 modules, are automated
systems that use a main electrical panel to monitor, report,
and modify critical system functions.
Heat Pump Power Panels
There are two different electrical panels used in the heat
pump. The main power distribution panel receives power
from the building source and distributes it to individual
modules. The electrical and control panel on each
secondary module receives power from the power
distribution panel that powers the individual electrical
components.
Panel-Mounted Disconnect Switch
Some heat pump systems are optionally equipped with a
panel-mounted disconnect switch installed on the outside
of the power distribution panel (or on each module’s
electrical and control panel if the heat pump has power
supplied to each individual module). The disconnect switch
must be turned to the OFF position before the panel can be
opened for service. When the panel door is open, the
power is disengaged.
Power Distribution Panels
The power distribution panel distributes electricity from the
external building power supply. It also houses a circuit
breaker for each module, a phase monitor, and an optional
main power disconnect switch. See following figure.
Figure 5. Power distribution panel