22
Microprocessor Circuit Board
The microprocessor circuit board contains the central processing unit that monitors the
various sensor inputs and controls the appropriate outputs such as the relays to activate the
various purge functions.
(see Figure 4 on page 17)
Compressor unit (C1)
Air cooled condensing unit compressor.
Pumpout Compressor (C2)
Vacuum pump C2 (see Figure 5 on page 18 for location) is used to purge non -condensables
from the purge tank during the pumpout cycle.
Temperature Sensor (TS1)
Temperature Sensor TS1 initiates and terminates the non -condensables
pumpout cycle (see
"Operating Cycle" on page 19).
Temperature Sensor (TS2)
Temperature Sensor TS2 (see Figure 5 on page 18 for location), monitors the purge tank
evaporating temperature.
Pumpout Solenoid Valves (L4 & L5)
Pumpout solenoid valve L4 controls exhaust from the purge tank. Valve L5 unloads the
Pumpout Compressor (C2) on start up (see Figure 5 on page 18 for valve location).
Operation of L4 is controlled by relay RY4. On start up, RY2 energizes the Pumpout
Compressor and RY5 momentarily energizes L5 (for approximately 2 seconds) until the
compressor starts. Then RY5 de-energizes and RY2 & RY4 remain energized for the duration
of the pumpout.
Drain solenoid (L3)
Drain solenoid valve L3 (see Figure 5 on page 18 for location), i s used to control the draining
of liquid refrigerant from the purge tank.
Liquid Level Switch (LS1) -
(see Figure 5 on page 18 for location).
Liquid level switch LS1 controls the "Upper" liquid refrigerant level in the purge tank. On liquid
level rise to the top of the purge tank sight glass LS1 triggers a drain back cycle.
Содержание Redi-Purge PRG-113-C3
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