State Standard Systems - Manual (Page 34)

34
proBlem checK this possiBle cause corrective action
Pump does not start Electrical power supply Controller plug disconnected Reconnect control plug to
power outlet
Blown fuse or breaker tripped
on overload
Determine cause and replace
fuse or reset breaker
Pump Motor failure Replace pump
Sensors Defective sensors, sensor
error
Check wiring continuity.
Repair or replace
Pump starts, but cycles
continuously
Differential controller On and/or off temperature
differential set points too low
Reset on and off
differentials according to
recommendations
Piping Reversed connections to
collectors
Compare with system
schematic and reconnect
properly
Sensors Improper location Compare with system
schematic and reconnect
properly
Pump cycles after dark Differential controller Recooling function active
and max temperature setting
exceeded
Controller operating properly.
No fault.
Sensors Defective sensors, sensor
error
Check wiring continuity.
Repair or replace
Pump runs continuously Differential controller Off temperature differential set
too low
Reset off differential according
to recommendation
Controller set to “on” position Set system operation to
“Auto”
Pump operated but no fluid
flows from collectors
Air Scoop System air-locked Purge air from air scoop in
solar pump station by opening
valve slowly. Caution: after air
is evacuated fluid will flow out
in a small stream and may be
hot. Cover port with a rag to
catch any fluid.
Air vent System air-locked Open air vent on the top of the
system and purge excess air.
Close after purging.
Fluid Loss of fluid from system Locate leak and repair
Isolation valves Valves in closed position Open valves
Piping Clogged or damaged piping Unblock piping or repair
damaged piping
Pump Broken impeller shaft Replace shaft
Not vented properly Install in correct orientation
Undersized System piping run too long.
Refer to maximum piping
lengths and adjust
Noisy system Air vents Air trapped in system Open air vent and purge air
scoop in solar pump station
by opening the valve slowly.
Caution: after air is evacuated
fluid will flow out in a small
stream and may be hot.
Cover port with a rag to catch
any fluid.
Pump Bearings are dry or have
excessive wear
Lubricate or replace
Impeller loose Tighten or replace impeller