Model LC (Australia) Pool and Spa Heater
Page 15
for all of these test. Disconnect the other blue wire
from the in-line fuse and touch the second voltmeter
lead to the blue wire terminal (see Fig. 19). The meter
should register 20 to 28 volts. If the voltage is less than
20V, the electrical circuit to the heater may be supply-
ing less than 240V. This could be due to high pump
load, air conditioners or other appliances on the circuit.
If the meter shows no voltage, replace the transformer.
NOTE:
Reconnect the blue wire to the in-line fuse.
Make sure the safety fuse is good before testing the
fusible link. If it is not, check for shorts.
b. Fusible Link
To check the fusible link, touch the voltmeter lead
to the lower terminal on the terminal block (see Fig.
20). If the meter shows voltage, the safety fuse and
fusible link are good.
Figure 19. Testing the Transformer
Figure 20. Testing the Fusible Link
A main cause of an open fusible link is abnormal
wind conditions. This could be caused by improper
clearances to buildings and walls. See Section 2B for
proper clearances.
c. Wire Harness/Limit Switches
To test the white wire harness, which includes the
high limit switches, touch the voltmeter lead to the
white wire lead on the pressure switch. If the meter
shows voltage, the wire harness is good (see Fig. 21).
If no voltage registers, look for defective or loose
terminals and broken or charred wires. Also, check the
wiring on the field-installed Fireman's switch if there is
one.
If the wiring and terminals are good, then the
limit switches are keeping the heater off.
The limit switches are located under the in/out
header. It is not necessary to remove the grate top to
replace the switches.
Remove the screw holding the limit switch cover,
and set it aside. Slide the retaining bracket toward the
rear of the heater until it comes free. Remove the two
high limits from their holes. Use this procedure to test
them (see Fig. 22):
1.
Pull the black rubber insulation down far enough
to expose the two terminals on each high limit.
