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Page 16
Temperature rise is measured at the return header,
which is on the side opposite to the inlet/outlet header.
For access, remove the side cover, which is held in
place by wing nut fasteners inside the heater. Remove
the brass plug on the top surface of the header and
install a Pete's Plug and pocket thermometer
(see Figure 25).
Proceed as follows:
1. If the piping system has a manual bypass
valve, close it.
2. Turn off the heater by moving the Flex Temp
switch on the temperature control panel to "Off".
3. After three minutes, note and record the
thermometer reading. This is the pool temperature.
4. Start the heater and let it operate for at least
fi ve minutes. Note and record the thermometer
reading. The difference between this reading and the
fi rst one is the temperature rise.
5. If the piping system has a manual bypass
valve, gradually open it until the temperature rise is in
the range required by Table 6.
6. Scribe a line on the bypass valve shaft and
case to mark the correct adjustment position. Wire the
handle to the pipe to prevent tampering.
Note that temperature rise is somewhat less when
the water is hot (spa application) and when heater is
installed at elevations signifi cantly above sea level.
For high elevation installations, reduce the numbers in
Table 6 by 3% per 1000 feet above sea level.
Minimum
Model
Temp Rise,
°F (C)
350
20 (11)
Table 6. Water Temperature Rise and Flow Rates (mea-
sured at return header).
In a system without external bypass, it may be
necessary to make changes. If temperature rise is too
low, a manual bypass must be installed. If temperature
rise is too high, there is inadequate fl ow, possibly
requiring a change to the piping system or a larger
pump. Before proceeding with either remedy, verify
proper heater operation. Low gas input results in low
temperature rise and vice-versa. A problem with the
heater internal bypass assembly also affects measured
temperature rise.
Minimum
Maximum
System
Temp Rise,
Flow
°F (C)
GPM
29 (16)
30
Figure 25. Temperature rise measurement at return
header.
SECTION 3.
Operating Instructions
Lighting and shutdown instructions are posted
inside the heater.
WARNING
Do not attempt repairs on the gas control or appli-
ance. Tampering is dangerous and voids all warran-
ties.
WARNING
LP GAS: To avoid possible injury, fi re and explosion,
read and follow these precautions and all instruc-
tions on this appliance before starting the heater. LP
(propane) gas is heavier than air and will remain at
ground level if there is a leak. Before lighting, sniff
at ground level. If you smell gas, follow these rules:
1. DO NOT light matches. DO NOT turn electric
lights or switches on or off in area. DO NOT use
an electric fan to remove the gas from area.
2. Shut off gas at LP tank.
3. Telephone gas company and fi re department
for instructions. Give your name, address and
phone number.
If your LP tank runs out of fuel, turn off gas at the
appliance. After the tank is refi lled, the appliance
must be re-started according to the instructions
located on the inside of the door.
3A. Start-Up Procedure
With any new pool or spa installation, run
the fi lter pump with the heater off long enough
to completely clean the water. This removes any
installation residue from the water. Clean the fi lter at
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