Reznor PDF2SF Unit Installation Manual - Manual (Page 37)

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Table 16. Module Wiring Troubleshooting
Miswired Module Indication Recommended Troubleshooting Action
Green LED is not on, module does not
power up
• Determine if both R & C module terminals are connected.
• Verify voltage is present at module’s R & C terminals.
Green LED intermittent, module powers up
only when compressor runs • Determine if R & Y terminals are wired in reverse.
• Verify modules R and C terminals have a constant source.
Trip LED is on, but system and
compressor check OK
• Verify Y terminal is connected to 24VAC at contactor coil.
• Verify voltage at contactor coil falls below 0.5VAC when off.
• Verify 24VAC is present across Y & C when thermostat demand
signal is present. If not, R & C are reversed wired.
TRIP LED & ALERT LED flashing together • Verify R and C terminals are supplied with 19 - 28VAC.
ALERT Flash CODE 3 displayed
incorrectly (Compressor short cycling) • Verify Y terminal is connected to 24VAC at contactor coil.
• Verify voltage at contactor coil falls below 0.5VAC when off.
ALERT Flash Code 5, 6, or 7 displayed
incorrectly (Open Circuit, Open Start
Circuit or Open Run Circuit)
•
Verify the compressor run and start wires are routed through
the module’s current sensing holes.
• Verify the Y terminal is connected to 24VAC at contactor coil.
• Verify voltage at contactor coil falls below 0.5VAC when off.
ALERT Flash Code 6 (Open Start Circuit)
displayed for Code 7 (Open Run Circuit)
or vice-versa
•
Verify the compressor run and start wires are routed through
the correct module sensing holes.
ALERT Flash Code 8 displayed incorrectly
(Welded Contactor)
•
Determine if module’s Y terminal is connected.
• Verify Y terminal is connected to 24VAC at contactor coil.
• Verify 24VAC is present across Y & C when thermostat demand
signal is present. If not, R and C are reversed wired.
• Verify voltage at contactor coil falls below 0.5VAC when off.
• Review Thermostat Demand Wiring (page 10) for Y & C wiring.
This equipments cooling system contains refrigerant under
high pressure, always use safe practices when servicing
the unit. Always review the factory literature and safety
warnings prior to servicing.
These units are shipped from the factory with the proper
amount and type of refrigerant. Always inspect the unit
rating label to determine the units information prior to
working on the system. Do not mix different refrigerants
or charge the unit with a refrigerant not listed on the unit
rating label.
The charging charts (Figures 17 - 20 pages 38 - 39) are
valid for a variety of indoor, return air conditions and are
most highly influenced by the outdoor ambient temperature,
outdoor fan operation and the unit operating voltage. Before
referencing the charts below, always make sure that the
compressor circuit is energized on high speed and has
stable operation. As can be seen in the charging charts,
the ideal system sub-cooling can vary over the range of
operation. Always reference the charts to determine the
ideal amount of sub-cooling for a given liquid pressure.
Units charged to other values will not perform at the rated
unit efficiency (EER).
To inspect a systems operation, using quality instruments,
match the measured liquid temperature to the units chart.
The measured liquid pressure reading should be within
3% of the value shown for most installations. For two stage
systems, the charts are valid for compressor operating
on high speed.
DO NOT use the charts for a two stage system operating
under a single stage call for cooling.
For systems that are operating with more then a 5%
deviation, inspect the unit for leaks. Always use safe and
environmentally sound methods for refrigerant handling.
When repairing system leakages, always utilize a nitrogen
(inert) gas to protect the refrigerant system and pressure
check the repair before re-charging. Always replace the
filter-dryers when performing any repair to the refrigeration
system. After completing the repairs, evacuate the system
to 350-500 microns and weigh in the refrigerant to the
amount specified on the unit rating label.
REFRIGERANT CHARGING CHARTS
Application Notes on the Use of Charging Charts