ā Evacuated Solar Energy Collector Technical Reference

(8.0) Trouble Shooting
No circulation in sy stem
Pressure drops in
sy stem
Overheating
Performance loss
C ollector
maximum
temperature at
Pump isolating v alv es closed
A utomatic air-v ent closed
Damaged insulation
Build up of lime stone
around heat exchanger tube
condenser
Troubleshooting
Problem Cause Action
A n ‘F’ reading on
controller LC D display
1.
2.
3.
Loose connections on
sensor leads
F aulty sensor
C ollector sensor at maximum
1.
2.
3.
C heck sensor w ires for connection
Replace sensor
No action required
Pump will not run 1. Mains/pump w iring faulty 1. C heck wiring at mains/pump
2. Pump rotor damaged 2. See pump manufacturers instructions
3. The pump control selector P 3. C heck SMT unit and return pump con-
is in manual ‘O F F ’ position trol P to automatic mode ‘A UT’
4. TC incorrectly set
4. Reset to 25°C
5. TC and �T not satisfied 5. No action required
Pump runs continu- 1. C ollector temperature is 1. No action required TF flashes
ously
below TF temperature
2. Loose connection or faulty
sensor on the collector
2. C heck connections and sensor w ires
3.
3. No action required
1.
1. O pen v alv es
2.
2. O pen aut. air-v ent and check condition
– replace if necessary
3. A ir lock at pressure relief 3. Twist cap at pressure relief v alv e and
valve
vent air
4. A ir lock in the sy stem 4. C heck all pipew ork rises on return
side, falls on flow side – clear manual
vents
5. Non-return v alv e jammed 5. Free v alv e or replace
6. Pump is not running 6. See abov e
7. Sy stem in stagnation 7. Wait until sy stem reaches normal
operating conditions
1. Leak at manifold
1. C heck collars on all tubes for leaks
tighten if necessary
2. Leak in sy stem
2. C heck all joints
3. Drain/filling v alv e not closed 3. C lose fully
4. A ut. air-v ent passing water 4. C lean or replace if necessary
5. F aulty pressure relief v alv e 5. Replace
6. Damaged expansion v essel
causes pressure fluctuation
and relief v alv e to open
6. Replace
1. Pump does not run
1. See abov e
2. Prolonged period of low hot
w ater consumption
2. Div ert heat to heat sink
1. Broken tubes
1. Replace broken tubes (because of
diode function of tube replacement
does not hav e to be done immediately
)
2.
2. Replace damaged parts
3.
3. Drain and clean sy stem thoroughly
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