oventrop OVSOL System 5 Manual page 33

Trouble Shooting
Trouble
7. Inadequate hot water
delivery temperature.
8. Tank pressure temperature
relief valve blowing off.
Sensor Test
Use an Ohm meter to measure the resistance of the sensor circuit. If an
open circuit or a short circuit situation is detected, then inspect the sensor
wiring before suspecting the sensor. Measure the sensor resistance
without the interconnecting wire before removing the sensor.
The resistance should match the chart for a given temperature.
Maintenance Procedures
Cleaning. The solar collectors will not require cleaning in a climate in which there
is periodic rainfall. A light coating of dust will not seriously affect performance. In
dry, dusty climates, collectors should be cleaned occasionally.
Circulators and Controller. No scheduled maintenance is required for the fluid
lubricated circulators or controller system. In the event of a circulator or controller
malfunction, refer to troubleshooting Checks.
Collector Loop Fluid. Collector loop fluid must be changed in order to maintain adequate freeze and
corrosion protection. Antifeeze checks should be performed annually. Collector loop fluid should be replaced
every 5 - 7 years. To prevent elevated temperatures from developing at the collectors, do not turn the system
off while absent from premises for extended periods.
Solar Storage Tank. Periodically drain a small amount of water from the bottom of tank to prevent sludge or
sediment buildup in the solar storage tank.
Scaling. If your water supply contains a large percentage of minerals (hard water), we strongly recommend
that a water softening device be installed to protect not only the stainless steel solar storage tank and coils
but also the existing hot water heater and its plumbing as well.
Probable Cause
A. Recent heavy usage of hot
water
B. Inoperative mixing valve
C. Ambient conditions
D. Inoperative back-up hot
water heater
E. Inoperative existing system
during periods of low solar
insulation
A. Inoperative P/T relief valve
B. Hot water storage tanks
building too much pressure
C. Water main pressure too
high
Remedy
A. Wait until system temperature is
replenished
B. Adjust or replace mixing valve
C. Wait until preset conditions are met
D. Replace back-up tank or service
thermostat or element in electric hot
water heater (this should be done by
licensed electrician)
E. Contact appropriate service
A. Replace P/T valve
B. Install hot water expansion tank
C. Install Pressure regulator on cold
water supply
31