American Dream Ultra Performance Geothermal Copper Series, Installation And Service Manual

Page: 43 / 60

25 MAY 2009 Page 43 000744MAN-02
PLENUM HEATER TROUBLE SHOOTING
Fault Possible Cause Verification Recommended Action
No 24VAC signal
from 1 to ground
at the plenum
heater control
connector
Faulty Plenum Heater
Relay in heat pump 24VAC is present across pin 1 and
pin 3 of the relay, 24VAC is present
from heat pump terminal strip I to
plenum heater ground, but not from
heat pump terminal strip 1 to ple-
num heater ground. Replace relay.
Fan not operating. See Fan Not Operating section. Correct problem. Reset thermal
overload. Thermal overload
is tripped.
Faulty overload Reset thermal overload Replace if faulty.
DOMESTIC HOT WATER (DHW) TROUBLE SHOOTING
Fault Possible Cause Verification Recommended Action
Insufficient hot
water
(Tank Problem) Thermostat on hot water
tank set too low. Should
be set at 120°F. (140
° F if
required by local code)
Visually inspect the setting. Readjust the setting to 120°F.
(140
° F if required by local code)
Breaker tripped, or fuse
blown in electrical supply
to hot water tank. Check both line and load sides of
fuses. If switch is open determine
why. Replace blown fuse or reset
breaker.
Reset button tripped on
hot water tank. Check voltage at elements with
multimeter. Push reset button.
Circulator pump not
operating. Visually inspect the pump to see if
shaft is turning. Use an amprobe to
measure current draw. Replace if faulty.
Insufficient hot
water
(Heat Pump Prob-
lem)
Blockage or restriction in
the water line or hot water
heat exchanger. Check water flow and power to
pump. Check water lines for
obstruction Remove obstruction in water
lines. Acid treat the domestic hot
water coil.
Faulty DHW cutout (failed
open). Check contact operation. Should
close at 120°F and open at 140°F. Replace DHW cutout if faulty.
Heat pump not running
enough hours to make
sufficient hot water. Note the amount of time the heat
pump runs in any given hour. Temporarily turn up the tank
thermostats until colder weather
creates longer run cycles.
Water is too hot. Faulty DHW cutout (failed
closed). Check contact operation. Should
close at 120°F and open at 140°F. Replace DHW cutout if faulty.
Thermostat on hot water
tank set too high. Should
be set at 120°F. (140
° F if
required by local code)
Visually inspect the setting. Readjust the setting to 120°F.
(140
° F if required by local code)
Digital
Refrigeration
In-line Flowmeter
Multimeter -
Voltmeter /
Trouble Shooting Tools
The Dole® flow control is a simple, self-
cleaning device designed to deliver a constant
volume of water from any outlet whether the
pressure is 15 psig or as high as 125 psi. The
controlling mechanism consists of a flexible
orifice that varies its area inversely with
pressure so that a constant flow is maintained.
Dole flow control Valve