Traulsen TBC13 - Refrigeration System Service; Leak Checking and System Evacuation

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VIII. SERVICE PROCEDURES (cont’d)
IX. k - CHECKING FOR LEAKS:
WARNING: DISCONNECT THE ELECTRICAL POWER
TO THE MACHINE AND FOLLOW LOCKOUT/TAGOUT
PROCEDURES.
WARNING: THIS PROCEDURE REQUIRES THE USE
OF REFRIGERANTS. BE CERTAIN THE WORK AREA IS
WELL VENTILATED. SAFETY GOGGLES AND GLOVES
SHALL BE WORN SINCE REFRIGERANTS MAY CAUSE
INJURY TO THE SKIN.
1. Access the refrigeration system.
NOTE: Recover remaining refrigerant based on current
EPA guidelines.
2. Connect the low (BLUE) side of gauge manifold
to schrader valve..
3. Connect refrigerant bottle to center of gauge
manifold and open valve on bottle to purge hose
to manifold gauge.
4. Open valve on low side of gauge manifold and
charge system with a small amount of R-22
refrigerant (1-2 ounces).
5. Close bottle valve and gauge valve.
6. Disconnect refrigerant bottle and connect
nitrogen bottle.
7. Set output valve on nitrogen bottle to equal the
appropriate pressure, for the design rated
refrigerant at 100 degrees F on the P/T chart.
NOTE: See system data plate for design refrigerant.
8. Open nitrogen bottle valve and gauge manifold
valve (low side) and allow pressure to equalize.
9. Shut off both valves and disconnect the nitrogen
bottle.
10. Using a leak detector, check for leaks at all
tubing connections.
a) If any leaks are detected, repair leak and re
check for additional leaks.
b) If no leaks are discovered, evacuate system
as outlined in section “VIII. M”.
NOTE: Install a permanent high side access port for
future system diagnostics.
11. Charge the system and check for proper
operation.
IX. l - EVACUATING THE SYSTEM:
WARNING: DISCONNECT THE ELECTRICAL POWER
TO THE MACHINE AND FOLLOW LOCKOUT/TAGOUT
PROCEDURES.
WARNING: THIS PROCEDURE REQUIRES THE USE
OF REFRIGERANTS. BE CERTAIN THE WORK AREA IS
WELL VENTILATED. SAFETY GOGGLES AND GLOVES
SHALL BE WORN SINCE REFRIGERANTS MAY CAUSE
INJURY TO THE SKIN.
Introduction - Refrigeration reclaiming equipment is
required. Our goal in system evacuation is to remove
all the non-condensables possible. No evacuation
method will remove 100% of the moisture and air from
within the refrigeration circuit. Because of this, guide-
lines and methods must be developed and adhered
to ensuring only harmless amounts of contaminants
remain in the system.
GUIDELINES
• Use only a two stage vacuum pump (2 CFM or
greater) and electronic micron gauge.
• Set output valve on nitrogen bottle to equal
appropriate pressure, for the design rated
refrigerant at 100 degrees F on the P/T chart.
• Evacuate from high and low sides of the system.
• No chemical additive or alcohols are to be used to
“dry up” a system.
• Blow down of system with DRY NITROGEN prior to
evacuation is acceptable and many times
desirable. See “System Clean-Up.”
• Evacuate to 200 microns of mercury.
1. Access the refrigeration system.
2. Connect low (BLUE) side of gauge manifold to
schrader valve on compressor access line and
high (RED) side of gauge manifold to schrader
valve on lter/drier line.
NOTE: If there is no high side access, install a
permanent sweat on tap.
3. Connect center line of gauge manifold to
vacuum pump.
4. Turn vacuum pump on and open both sides of
gauge manifold.
5. Pull a vacuum to 200 microns.
6. Charge system and check for proper operation.