21
Optional Accessories
The purge unit can be equipped with three optional accessories.
1. Emission Collection Canister saturation alarm (option)
If the electronic refrigerant emission monitor for the ZERO EMISSION CANISTER accessory
is desired to be incorporated into the purge units control it will indicate when the emission
collection canister becomes saturated with refrigerant. For more information contact
Equipment Servicing.
2. Chiller mounted condenser temperature sensor TS3 (option)
Optional chiller mounted temperature sensor TS3 is used with “Free -Cooling” or ice storage
chillers. It is used to prevent inadvertent refrige rant pumpout by the purge unit when chiller
condensing saturation temperature drops “too low”. For more information contact Equipment
Servicing.
3. Chiller evaporator pressure Pre-Alarm PS1 (option)
The chiller evaporator pressure Pre-Alarm (PS1) continuously monitors pressure status in the
chiller’s evaporator and provides an alarm when the pressure exceeds a pre -determined level.
The Pre-Alarm feature maintains a record of the daily peak pressure events and time of day
event occurred. For more information contact Equipment Servicing.
System Components
This section identifies the purge system components (see Figures 2, 3, 4, 5 & 6 on pages 17,
18, & 19).
Purge Control Panel
All Purge unit functions are controlled via a multi -function 16-keypad switch and a LCD
display located on the front of the unit’s electrical control box. (See information starting on
page 30 for further information on the functioning of the various keypad switches.)
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