Robinair 75700 Coolant Exchanger - Manual (Page 9)

7
Cool Tech 75700 Cool X change
Pressure Test
This procedure checks the coolant system for leaks.
A drop in pressure indicates a leak in the system
that must be repaired before refilling the system
with coolant.
IMPORTANT: For correct operation of the
75700 unit, adjust Valve 1 and Valve 2 in the
sequence specified in these instructions.
1. Turn the regulator on the 75700 control panel
counterclockwise (CCW) to lower the test
pressure. See Figure 10.
Note: Adjusting the regulator requires pulling up
on the regulator knob, and then turning the knob.
2. Turn Valve 1 to PRESSURE TEST.
3. Turn Valve 2 to PRESSURIZE.
4. Adjust the regulator clockwise to the correct test
pressure.
l l l l l
Figure 10
l l l l l
Valve 1 Valve 2
CAUTION: To prevent damage to the
vehicle, test pressure must range BELOW the
pressure indicated on the radiator cap,
overflow cap, or vehicle specifications.
Pressure Gauge
Regulator
5. Turn Valve 2 to HOLD.
6. Observe the pressure gauge on the control panel:
• a constant pressure reading indicates no leaks
in the system;
• a drop in pressure indicates a leak in the system
that must be repaired.
Note: The cooling system may need to be
pressurized more than once to equalize test
pressure throughout the system.
7. If a leak must be repaired, turn both valves to
VACUUM to relieve pressure. Perform repairs,
and repeat the Pressure Test.
If no repairs are needed, proceed to the Exchange
Procedure.