IOM / ROOF-TOP FLEXY™ Series - Page 123
FAULT
LP PROBLEMS
and
LP CUT OUTS
HP PROBLEMS
AND HP CUT
OUTS
maintenance diagnostic
REFRIGERATION
POSSIBLE CAUSE AND SYMPTOMS
Refrigerant charge too low
In Heat Pump Mode the temperature difference
between T outdoor and Tevap. (Dew) is too
high
5°C < Delta T < 10°C excellent
10°C < Delta T < 15°C acceptable
15°C < Delta T < 25°C too high
Refrigeration circuit blocked in distribution
Liquid line drier blocked. High temperature
difference between inlet and outlet of the drier
Contaminant in the expansion valve
Expansion valve not adjusted properly
Ice plug in the expansion valve.
Incorrect insulation of the thermostatic bulb of
the expansion valve
Low Pressure Switch cut out point too high
LP cut out due to not enough defrost on heat
pumps
Incorrect Airflow rates
Moisture or contaminants in the system
SOLUTION
Measure the superheat and sub-cooling:
Good if 5°C<SC<10°C and 5°C<SH<10°C
Bad if SC>10°C and SH too Low
Check superheat adjustment and charge unit (a
leak check must be carried out)
If too high check the coils are clean or check
coil internal pressure drop between the liquid
line and the suction line
Good if < 3bar
Too high if > 3bar (coil blocked)
Stop the fan and create icing of the coil.
Check all circuits freeze evenly across the
whole surface of the coil
If some parts of the coil do not freeze this could
indicate a problem with the distribution
Change filter drier
Attempt to free the valve adjusting element by
freezing the valve and then heating the
thermostatic element. Replace the valve if
necessary
Adjust the expansion valve
Heat the main body of the valve. If the LP
increases and then decreases gradually, empty
the circuit and replace the drier.
Superheat too low: adjust superheat
Move the thermostatic element along the pipe
Insulate the Thermostatic element of the valve
Check the cut out pressure of the Low Pressure
switch: It must be 0.7+/- 0.2bar and must
closes at 2.24 +/- 0.2 bar
Adjust the CLIMATIC settings to extend the
defrost cycles or shorten the time between
defrosts
Heat pump mode :
Check the filter before the indoor coil
measure and estimate the airflow rate
increase the speed of the fan
Cooling mode :
Check the condenser fan (Amps)
Summer operation
Several hours after the unit has stopped, check
the correspondance between the measured
pressure and the outdoor temperature
Table 15
Summary of Contents for ROOFTOP FLEXY FCA 100
Page 1: ...INSTALLATION OPERATING MAINTENANCE MANUAL ROOFTOP FLEXY English August 2003 ...
Page 2: ......
Page 33: ...IOM ROOF TOP FLEXY Series Page 31 AIR FLOW BALANCING AT 12 12 FAN ...
Page 34: ...Page 32 IOM ROOF TOP FLEXY Series AIR FLOW BALANCING AT 15 15 FAN ...
Page 35: ...IOM ROOF TOP FLEXY Series Page 33 AIR FLOW BALANCING AT 18 13 ...
Page 36: ...Page 34 IOM ROOF TOP FLEXY Series AIR FLOW BALANCING AT 18 18 FAN ...
Page 37: ...IOM ROOF TOP FLEXY Series Page 35 AIR FLOW BALANCING RDN 450 FAN ...
Page 38: ...Page 36 IOM ROOF TOP FLEXY Series AIR FLOW BALANCING ADN 355 FAN ...
Page 39: ...IOM ROOF TOP FLEXY Series Page 37 AIR FLOW BALANCING ADN 400 FAN ...
Page 40: ...Page 38 IOM ROOF TOP FLEXY Series AIR FLOW BALANCING ADN 450 FAN ...
Page 104: ...Page 102 IOM ROOF TOP FLEXY Series ELECTRICAL WIRING DIAGRAMS MAIN CURRENT DIAGRAM ...
Page 106: ...Page 104 IOM ROOF TOP FLEXY Series ELECTRICAL WIRING DIAGRAMS CLIMATIC CONTROLLER ...
Page 108: ...Page 106 IOM ROOF TOP FLEXY Series ELECTRICAL WIRING DIAGRAMS CLIMATIC INPUT FG FD ...
Page 112: ...Page 110 IOM ROOF TOP FLEXY Series ELECTRICAL WIRING DIAGRAMS GAS BURNER 180 Kw ...
Page 132: ...Page 130 IOM ROOF TOP FLEXY Series ISO 9001 CERTIFICATION ...
Page 133: ...IOM ROOF TOP FLEXY Series Page 131 PED CERTIFICATION OF CONFORMITY ...
Page 134: ...Page 132 IOM ROOF TOP FLEXY Series GLASS WOOL FIRE CLASS ...
Page 135: ...IOM ROOF TOP FLEXY Series Page 133 33 kW GAS BURNER CE CERTIFICATION OF CONFORMITY ...
Page 136: ...Page 134 IOM ROOF TOP FLEXY Series 60 kW GAS BURNER CE CERTIFICATION OF CONFORMITY ...
Page 137: ...IOM ROOF TOP FLEXY Series Page 135 120 kW GAS BURNER CE CERTIFICATION OF CONFORMITY ...
Page 138: ...Page 136 IOM ROOF TOP FLEXY Series 180 kW GAS BURNER CE CERTIFICATION OF CONFORMITY ...
Page 139: ...IOM ROOF TOP FLEXY Series Page 137 INSULATION FIRE CLASS ...
Page 140: ...Page 138 IOM ROOF TOP FLEXY Series INSULATION FIRE CLASS ...
Page 141: ......