American Water Heater DELUXE SYSTEM Instruction Manual page 34

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