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TM077: 325 & 410 Series II Heat Pump Service Instructions
Rev 00: Issued April 2014
Refrigeration System
The following warnings and requirements apply to all work carried out on the heat pump
module‟s hermetically sealed refrigeration system.
Warnings
WARNING: The heat pump must NEVER be operated with the refrigeration
system open to atmosphere.
WARNING: When reclaiming refrigerant, BOTH sides of the refrigeration
system must be open to the reclaim bottle, in order to prevent the
possibility of sections of the refrigeration system remaining pressurised.
WARNING: When removing refrigeration system components, refrigeration
pipes should be cut rather than unbrazed wherever possible.
WARNING: Heat must NOT be applied to plastic components. When
brazing pipework a heat shield must be used to prevent the possibility of
damage.
Requirements
Only personnel qualified and licensed to work with refrigerants may carry
out repair procedures on the sealed refrigeration system.
All work conducted must conform with the refrigeration code of practice.
During repair the refrigerant must always be recovered, never vented to
atmosphere.
The refrigeration system MUST be nitrogen purged whenever brazing is
being carried out. This includes nitrogen purging when removing
refrigeration components.
Time Allowances
Each of the Component Replacement Procedures for the sealed refrigeration system
components includes an indication of the time that should be allowed to complete the
procedure.
* The time allowance includes replacement of the filter drier, but does not include
the time needed to:
Reclaim the refrigerant
Evacuate the refrigeration system
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