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The MVB must be equipped with a field-supplied ex-
ternal
pump
and
arrangement blends outlet water with the inlet water to
increase the inlet water temperature to a minimum of
120°F (49°C), thereby reducing the likelihood of con-
densation forming on the heat exchanger. The pump
also serves to circulate water through the heater from
the main system piping.
CAUTION: Power to the heater should be
interlocked with the main system pump to make sure
the heater does not fire without the main system
pump in operation. Improper flow control can
damage the heater. Uncontrolled flow (too high) or
restricted flow (too low) can seriously damage the
heater. Follow these instructions to make sure your
heater is properly installed.
To complete the installation of the pool heater, the pool
thermostat must be installed in the main return water
line, upstream of the heater. This will ensure that the
heater will be energized at the right time.
*Maximum 4 times the pipe diameter or 12", whichever is less.
Fig. 15: Single Pool Heater Application
Adjustment of the manual bypass valve is critical to
proper operation of the heater. The manual bypass
valve should be adjusted to achieve a minimum inlet
water temperature of 120°F (49°C) and a system sup-
ply water temperature below 140°F (60°C). When
starting with a cold pool, make initial adjustments.
Make final adjustments when pool water approaches
desired temperature.
The use of a bypass is required for proper operation in
a pool heating application. Use the following instruc-
tions to set the manual bypass:
bypass
arrangement.
POOL
THERMOSTAT
*
TO POOL
CHEMICAL
FEED
1. Turn on pump.
This
2. Turn on heater and wait until heater goes to full
fire.
3. With the heater operating at 100% firing rate, set
Valve A (the bypass) to
B to fully open position. See Fig. 16.
4. Adjust Valve A until the inlet water temperature is
120°F (49°C).
NOTE: Opening the valve will increase the
temperature and closing the valve will decrease the
temperature.
5. If this process does not raise the inlet water tem-
perature to 120°F (49°C) and Valve A is fully open,
then slowly throttle Valve B closed to increase the
inlet water temperature to 120°F (49°C).
FROM
FILTER
17
⁄
open position, and Valve
1
2
Fig. 16: "H" Bypass Setting
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