Viking FBCI 1150G Service Manual page 25

(19) Suction Pressure
(20) Metering Device?
(21) Repair Metering Device
(22) Correct Charge?
(23) Compressor OK?
SMR-0014
Monitor suction pressure to see how the system is operating.
Since this refrigeration system is critically charged no field ac-
cess has been provided. In order to understand how the system
is operating, it is also necessary to determine the current draw of
the compressor. In the event that the system must be accessed
for troubleshooting it will be necessary to install a piercing type
"saddle valve" on the low side process tube. Pierce the process
tube and connect refrigeration gauges. To monitor the current,
use a clamp on amp probe or similar device. Additionally, if system
pressures seem low, check frost pattern of evaporator coil. See
attached operating conditions chart for operating specifications.
If pressure is low, check to ensure metering device is not obstruct-
ed by monitoring pressures and the frost patterns. Try adding
additional refrigerant to see if frost pattern changes. If frost pattern
changes, system is most-likely low on charge. If no change, me-
tering device may be restricted.
Following established industry practices and applicable local,
state and federal laws regarding refrigerant handling, (See section
Potential Problems with HFC-134a for Viking Range Processing
recommendations), check for restrictions Within the system and
repair.
If charge is low from amperage readings and frost pattern, check
system for leaks. Never add any dyes or other leak detection
materials to the refrigeration system, as this will void the warranty.
Find the leak and repair. Recharge the system by weighing in the
proper charge as shown on the ID plate of the cabinet. Always fol-
low established industry practices and applicable local, state and
federal laws reading refrigerant handling. (See section Refrigera-
tion Processing) for processing recommendations.
If system pressure is excessively high without an excessive frost
pattern on the evaporator, and compressor has an internal leak-
ing sound when power is turned off, compressor may have internal
damage.
15" & 24" Series
Technical Services Manual
Page25