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