Raypak 503-2003 - Manual (Page 17)

17
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.
To complete the installation of the pool heater, the pool
thermostat needs to be installed in the main return wa-
ter line, upstream of the heater. This will ensure that
the heater will be energized at the right time.
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:
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.
1. Turn on pump.
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
1 ⁄
2
open position, and Valve
B to fully open position. See Fig. 14.
4. Adjust Valve A until the inlet water temperature is
120°F (49°C).
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).
Automatic Chlorinators and Chemical
Feeders
All chemicals must be introduced and completely di-
luted into the pool or spa water before being circulated
through the heater. Do not place chlorine tablets or
bromine sticks in the skimmer. High chemical concen-
trations will result when the pump is not running (e.g.
overnight). Chlorinators must feed downstream of the
heater and have an anti-siphoning device to prevent
chemical back-up into the heater when the pump is
shut off.
Winterizing Your Heater
Heaters installed outdoors as pool heaters in freezing
climate areas should be shut down for the winter. To
shut the down heater, turn off manual main gas valve
and main gas shut-off. Close isolation valves. Drain
the heater using the hose bibs located on the bottom
of the heat exchanger.
*
Fig. 13: Single Pool Heater Application
CAUTION: Combustion air must not be
contaminated by corrosive chemical fumes which
can damage the heater and void the warranty.
NOTE: Opening the valve will increase the
temperature and closing the valve will decrease the
temperature.
NOTE: High chemical concentrates from feeders
and chlorinators that are out of adjustment will cause
very rapid corrosion of the heat exchanger in the
heater. Such damage is not covered under the
warranty.
*Maximum 4 times the pipe diameter or 12”, whichever is less.