Bulletin 76-00 B
22
Service Pointers
V300 Service Pointer
Symptom
Possible Cause
Solution
Water bubbler cloudy
Water supply turned off.
Open water supply ball valve supplied with purger.
Check water solenoid coil for proper operation (Loose wire, burned out). Replace if
necessary.
Hard water.
Used treated water (softened). Clean bubbler on regular bases to prevent severe
clouding.
Venting ammonia.
Check vent solenoid for proper operation. If bubbles are seen in the water bubbler
when idol, vent solenoid is leaking. Clean or replace solenoid if needed.
Cloudy bubbler
Clean the bubbler using a long handle bottle brush and a cleaning agent such as
CLR®, Lime-A-Way® or vinegar can be used to remove the water scale.
Purger stays in “Pre-Cool” mode,
will not purge.
Suction too high.
Verify Suction is below 4.4
o
C (40
o
F) - 4.0 bar (58.4 psig) for R-717.
Adjust the A2 suction regulator to maintain 5 psig (If in or near a vacuum). If suction
is above 5 psig, remove setting from A2 regulator by turning stem counter clock wise
until it stops.
Liquid NH
3
supply off or obstructed.
Check liquid ammonia solenoid, S6P, for proper operation (Loose wire, burned out).
Replace if necessary.
Check controller display for “Liquid Solenoid” pilot light. Segment should be darkened
if liquid is required. This is located on the upper left side of the front panel (#1).
Check level sensor for proper operation (Loose wire, defective sensor). Replace if
necessary.
Check liquid supply orifice for obstructions. Clean or replace if necessary.
RTD not reading accurately or no
display.
Note: RTD is factory calibrated and no field adjustment is required.
If the main controller displays “_ _ _” rather than an actual temperature reading, check
for loose wires. Check wire loom from main board to cover for loose or damaged
wires/ connections.
Replace RTD if necessary.
No temperature reading on
controller display.
Loose RTD connection.
Check for loose wires connecting the RTD to the main controller board.
Loose or damaged wire loom
connecting front panel to main board.
Check wire loom from main board to cover for loose or damaged wires/ connections.
Faulty RTD.
Check resistance range of the RTD (100 ohm +/- 0.1%) Replace RTD if necessary.
No pressure reading on controller
display.
Loose wire connection.
Note: pressure transducer is factory calibrated and no field adjustment is required.
Check for loose wires connecting the pressure transducer to the main controller
board.
Faulty pressure transducer.
Replace pressure transducer if necessary.
Purger reaches target pressure,
vent solenoid will not open
Water is not available
Check water supply line to purger and ensure water is available
Check water solenoid coil for proper operation
Check water solenoid valve for blockage
Water flow switch is faulty
Replace water flow switch
Purge solenoid coil faulty
Check solenoid coil for proper operation, replace if necessary
Water is supplied to water sole-
noid valve but no flow is present
Check water supply line to purger and ensure water is available
Check water solenoid coil for proper operation
Check water solenoid valve for blockage
ADVISORY
- The water supply should use softened or filtered water to prevent
calcification or deposits which could block the water solenoid valve.
If softened/filtered water is not available premature failure of the water
solenoid valve may result.
Summary of Contents for V300
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