Model DP Oil-Fired Heater
Page 9
The bypass valve is properly adjusted. Remove
the handle on the valve, or place a warning tag “DO
NOT TOUCH THIS VALVE.”
Install a check valve and heat sink pipe in the
heater inlet if any part of the piping or filter system
uses plastic materials (see Fig. 15).
2G. Pressure Relief Valve
A pressure relief valve is not furnished with the
heater, except in Canada. Check local building and
plumbing codes to determine if a pressure relief valve
is required. A 75 psi rated relief valve is recommended
for protection of the filter system if there is a shut-off
valve installed between the heater and the pool (see
Fig. 14). If a pressure relief valve is not required, leave
the standard 3/4" brass plug in place.
2H. Automatic Chlorinators
A concentration of chlorine in the heater can be
very destructive. Heater damage caused by high
concentrations of chlorine, for any reason, is not
covered by the warranty.
IMPORTANT:
1.
Provide the automatic chlorinator with an anti-
siphoning device to prevent chlorine siphoning
into the heater after the pump shuts off.
2.
Wire the electric chlorinator so it cannot operate
unless the filter pump is running. If the
chlorinator has an independent clock control,
synchronize the filter pump and chlorinator
clocks, so the chlorinator only operates during the
filter cycle.
3.
If the chlorinator is equipped with its own pump,
install it so that it introduces the gas or solution
downstream from the heater, and at a lower
position than the heater outlet.
2I. Electrical Wiring
Wire the XL-3 heater in accordance with the
National Electric Code and all applicable local codes.
The power supply must be 11 5V, 60Hz, single phase
with voltage maintained between 104V and 126V.
have a double-pole ON/OFF switch (see Fig. 16-17).
Run all field-supplied wires in conduit to the
knockout at the bottom of the ON/OFF switch box.
Figure 15. Water Piping.
Figure 14. Pressure Relief Valve.
Manual bypass is used
only when filtration rate
normally exceeds
60 gallons per minute
Thermometer For
Testing Temperature
Rise
