Manual selection, installation and maintenance
56
Roof-top units -
RTE series
-
Diagnosis and fault solving
PROBLEM
CAUSE
SYMPTOM
SOLUTION
1. SUPPLY AIR
TEMPERATURTE
HIGHER THAN
FORESEEN
1. Heat power too high
- The air temperature on supply is
higher than the foreseen value
- Decrease the heat power,
decreasing the flow rate or the air
inlet temperature
2. Room temperature too
high
See 2.1.
- Avoid air recirculation on conden-
ser. Facilitate the fresh air flow.
3. Condensers fins clogged
See 1.1.
- Clean the condensers fins
4. Condensers front surface
obstructed
See 1.1.
- Liberare la superficie frontale del
condensatore ostruita
5. Fan rotates in the opposite
direction
See 1.1.
- Invert the position of two fans
phases
6. No refrigerant in the coo-
ling circuit
- Low evaporation pressure
- Presence of air bubbles in the
liquid lights
- Search the refrigerant leakages (by a
specialized technician) and avoid them.
- Realize the recharge (by a
specialized technician)
2. INSUFFICIENT
COOLING
CAPACITY
1. Insufficient refrigerant
charge
- The cooling circuit operates pro-
perly, but with insufficient capacity
See 1.6.
2. Room temperature too
high
See 2.1.
- Avoid air recirculation on conden-
ser. Facilitate the fresh air flow.
3. Abnormal noise
1. Vibrations in the ducts
- The unit noise is higher than normal
- Properly fix the ducts with brackets
2. Loud compressor
See 3.1
- Verify and eventually replace
3. Loud expansion valve
See 3.1
- Verify. Add refrigerant if necessary.
Replace it if necessary.
4.INTERVENTION
OF THE LOW
PRESSURE
SWITCH
1. Pressure switch out of use
- The compressors stop
- Verify and replace the pressure
switch.
2. Unit completely empty
See 4.1.
See 1.6.
3. Refrigerant filter clogged
See 4.1.
- Verify and replace the filter
4. The expansion valve does
not operate properly
See 4.1.
- Verify, clean, eventually replace
5. Room temperature too low
See 4.1.
- Install the condensate control kit
