Back Bar Service Manual
Return to Table of Contents Refrigeration System Repair Instructions Page 6-3
System Operating Pressures
Note: To check operating pressures, you must
gain access to the service valves. See
Section 6.4.4.
6.4.1 First Time Pull-Down
After 7 minutes of intermediary speed, the speed is
increased to maximum and it is kept at this
rotation until the thermostat opens, switching the
compressor off.
6.4.2 Normal Cycling
Compressor speed increases and decreases
proportional to thermal load variation during
compressor running time. Minimum speed will be
targeted to minimize energy consumption.
6.4.3 Stabilization
If thermal load remains constant for a period
longer than 20 minutes, the compressor speed is
increased.
Note: The Compressor speed will be adjusted
automatically by the Inverter, in accordance to the
thermal load variation. (variable speed only)
Values in Table 6-1 represent a range of normal
pressures. The measured pressure can vary
depending on ambient conditions and at the point
at which unit is in the refrigeration cycle.
Table 6-1. System Operating Pressures
6.4.4 Service Valves
STEP 1.
Remove the refrigeration deck (see Section 6.2),
See Figure 6-5.
STEP 2.
Remove black caps. See Figure 6-7.
STEP 3. Recording pressure
When installing gauges:
1. Initially purge manifold set with refrigerant
type used in unit. This avoids introduction of
air into system.
2. Crack valve off back seat position to read
pressures.
3. Allow unit to run for 10 minutes and stabilize
before recording pressures.
When disconnecting hoses:
4. Initially back seat the high side service valve.
5. Open manifold on gauges to place high side
liquid back into system and equalize gauges.
6. Then back seat low side service valve and
remove gauges.
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