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1. Check and clean the air filter. It may be necessary
to replace, if very dirty.
2. Check for excessive pipe length on vent.
3. Check for a dirty or worn fan unit.
4. Check to see if the “P” trap is clear.
WARNING
Do not attempt to adjust the gas pressure at
the gas valve. Serious damage could occur.
3B. Electrical Troubleshooting
This section describes procedures for checking the
electrical power and control components of the heater
(see Fig. 7 for a typical example of a wiring diagram).
Use the flowchart (see Fig. 8) and the following
sections to troubleshoot the heater. Read all of these
procedures before starting repairs.
The following tools are required for proper service
and problem diagnosis of the heater and heater system:
1. Gas pressure test kit with range from 0 to 14
inches (0 to 356 mm) W.C.
2. Electric meter(s) with the following ranges:
a.
0 to 150 volts alternating current (VAC)
b.
0 to 25V direct current (DC)
c.
0 to 2,000 ohms resistance
3. A pressure gauge and a thermometer with proper
ranges for heater operation.
3B-1. Testing the Electrical Supply Power
The electrical components of the Hi-E heater
operate with supply voltage ranging from 103 to
126VAC at 60 Hertz (Hz). To test the electrical power
supply:
1. Measure the voltage at the hot and neutral wirenut
connections in the heater electrical junction box.
2. Voltage outside of the required range may be due
to poor wiring connections, to other loads (e.g., air
conditioning compressors), or to an electrical
utility company problem.
3B-2. Testing the Pressure Switch
All new heaters are provided with pressure
switches preset to work at an optimum elevation of 3
feet (0.91 m) above or below the water surface level of
the pool/spa to be heated (see Fig. 9). However, the
switch can be adjusted to operate correctly in heaters
installed a maximum of 10 feet (3.05 m) below the
water surface of the pool/spa and to a maximum of 6
feet (1.83 m) above the water surface.
NOTE:
Pressure switches are only adjusted to turn
heater off, not on.
•
DO NOT adjust the pressure switch if the heater is
installed at elevations of more than 6 feet (1.83 m)
above the water surface or more than 10 feet (3.05
m) below the water surface. Instead, contact your
Teledyne Laars representative for instructions.
If it is known positively that too much water
pressure is preventing the switch from opening and
turning the heater off, adjust the pressure switch (see
Sections 3B-5). If the heater is installed within the
recommended range, but does not fire, perform the
following back pressure test to check the water pres-
sure switch:
1. Use a volt-ohmmeter and check the voltage at the
water pressure switch.
2. If voltage is found at one terminal and not the
other, the pressure switch is keeping the heater
from firing.
3. To further isolate the problem, remove the copper
tube from the pressure switch.
4. Attach a pressure gauge to the tube and turn on
the pump.
5. If the pressure gauge reads less than 2 psi (14
kPa), there is a pressure related problem. The
problem may be caused by low water pressure.
A drop in the water pressure may be caused by:
1. A very short pipe run from the heater to the pool
or spa may prevent sufficient back pressure from
developing and prevent the pressure switch from
closing. If this occurs, lengthen the piping between
the heater and the pool where the return line
enters, or install directional fittings or elbows.
