Redi Controls Redi-Purge PRG-113-C3, Инструкция по установке, эксплуатации и обслуживанию, Страница: 11 / 68

11
Removing Old Purge Unit
Replacing the existing purge system on older centrifugal chi llers with the new Purge Unit
requires that the existing purge system be completely disconnected and removed. Before
proceeding with the retrofit it is important that the installer thoroughly review and understand
the following instructions for preparing the chiller to remove the old purge system.
Preparation
WARNING:
Be sure to open and lock-out all electrical disconnects to prevent
possible injury or death cause by electrical shock.
1.
Terminate chiller operation and disconnect all electrical power to the chiller and old
purge unit.
2.
Turn off water supply to purge system, where applicable.
3.
Close the angle valve on the condenser to isolate inlet to purge system.
4.
Close the liquid return angle valve on the evaporator to isolate outlet of purge system.
NOTE: It is not necessary to remove chiller’s refrigerant charge to retrofit a new purge unit.
Removal Procedure
Disconnect and remove all existing purge unit electrical connections from both the old purge
unit and chiller control panel. Disconnect the water lines to the old purge tank, if applicable,
and cap off or remove. These water lines are no longer needed since the new purge system
does not require the use of water.
Disconnect the copper line from the purge solenoid valve (if presen t) on the condenser.
Temporarily cap off the flare fitting on solenoid valve. If there is no solenoid valve on the
condenser, remove copper line and cap off condenser fitting as quickly as possible to
minimize air leakage into chiller. This fitting will be used later on. Also disconnect the copper
line from the purge compressor inlet, remove and discard tubing.
Disconnect the 1/4-inch copper liquid return line from the liquid return valve on the evaporator
and from the purge tank, remove and discard tu bing. Also, if the purge tank relief is piped to
the rupture disc vent, disconnect and remove pipe. Unbolt old purge base from its mounting
and remove.
WARNING
To avoid possible injury or damage to equipment, be sure to have
appropriate equipment available to lower the purge unit from the chiller (if necessary).