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 ACTION
PROBLEM
SYMPTOM
CAUSE
(cont)
(cont)
(cont)
(cont)
Check air vents in water lines for
Noises
Gurgling in pipes
Air in piping
proper installation and operation,
and/or reroute piping. Vent air
from collector loop piping, and/or
recharge with solar fluid.
Isolate pumps and piping from
Humming
Pump vibration
building structure. Inspect
shafts and bearings.
Pipe expansion/contraction Isolate piping from building
Squeaking
structure. Use "slip" hangers.
Wet rotor pump not primed Repair or replace pump. Be sure
Pump screeching
pump is filled before starting.
Repair or replace worn bearings.
Bearings worn, or shaft
Check shaft alignment.
out of alignment
4.3 SPECIFIC TROUBLESHOOTING OPERATIONS
4.3.1 Sensor and Sensor Wiring.
Controls Without Digital Displays
To check suspicious sensors, disconnect the wires from their terminal at the control.
Leave the connections intact at the sensor for the time being. Using an ohmmeter,
and the temperature vs. resistance charts in Tables 4-1 and 4-2, determine if the
resistance of the sensor is appropriate for the temperature it should be measuring.
(If using an analog meter with several resistance scales, the 100 x R scale is
normally the most useful.)
Confirm also that the sensor resistance changes as the sensor temperature
changes. This may require warming a cool sensor in your hand, or moving a sensor
off a warm collector or tank into the cooler air.
CAUTION
Do not immerse sensors in warm or cold water. Most sensors are
not waterproof, and can be damaged with water. Resistance
readings of an immersed sensor will not be correct. If temperature
extremes are needed to check the sensor, wrap it in a plastic bag
before immersing it in water.
TROUBLESHOOTING
111
4.3 TROUBLESHOOTING OPERATIONS
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