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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.
Vapor Injected Scroll Compressor
ARTC-SVX006A-EN
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.
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.
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.
WARNING
7
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