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4
Water connections
The water connections / sub-loop shall not be
smaller than what is called out in Table 4A. The
total length of the sub-loop shall not total more
than 45 equivalent feet of linear pipe.
For every elbow and tee in excess
NOTICE
of those shown above, deduct 5 feet
from the maximum allowable straight
pipe in the pool heater to the system
circulating loop.
Minimum Pump Performance
Pump performance is based on providing adequate flow to
prevent scale accumulation in the heat exchanger. See Water
Chemistry on page 48.
TABLE-4B
Minimum Pump Performance
Models
502 - 752
992 - 1442
1802 - 2072
Heat exchanger
A Cupro-Nickel heat exchanger is standard on 1802 - 2072
models. On all models, header inspection plugs can be
removed for field inspection and cleaning of copper tubes.
The entire heat exchanger may be easily removed from the
pool heater.
Should overheating occur or the gas supply
⚠WARNING
fail to shut off, do not turn off or disconnect
the electrical supply to the pump. Instead,
shut off the gas supply at a location external
to the pool heater.
Initial set-up of maximum water flow
On initial start-up of the Copper-Fin
water flow to the heat exchanger must be checked and manually
limited with a valve or bypass before normal operation begins.
Table 4C_Pressure Loss Table
CONFIGURATION
VERTICAL
HORIZONTAL
VERTICAL
VERTICAL
HORIZONTAL
HORIZONTAL
38
GPM
Ft.Hd.
55
10
90
15
115
18
pool heater, the maximum
2
PIPE SIZE
PRESSURE LOSS (PSI)
2"
2"
2.5"
2.5"
2.5"
2.5"
Installation & Operation Manual
An appliance allowed to operate at return
⚠ CAUTION
temperatures below the specified minimum
setting may experience problems with
the operating controls, safety switches,
obstruction of the flue gas passages on the
heat exchanger, incomplete combustion
and possible flue gas spillage. Sustained
operation at lower than specified water
temperatures (140°F) may cause hazardous
conditions that may result in personal injury
or non-warrantable damage to the appliance.
Auxiliary Mixed Water Limit Control
Pool return and pool supply (mixed water limit)
sensors (reference FIG. 4-3, page 39):
Ensure pool return and pool supply (mixed water limit) sensors
are both installed in the system piping. The return sensor should
be installed in the upstream of the feed water to the pool heater.
The supply sensor limits the temperature of the water going back
to the pool (factory adjusted to < 110°F). The supply sensor may
be installed in the filtration system piping, be sure to keep it at
least three (3) feet downstream from the point where the heated
water from the pool heater is being added to the filtration system.
Note: In order to accurately sense water temperatures, both
sensors need to be in the actual water flow.
Installation of return and supply sensors:
Both pool sensors are immersion type sensors with 1/4" NPT
threads and may be installed directly into the system piping
by drilling 7/16" pilot holes and tapping them with a 1/4" NPT
tapered tap. Apply a small amount of high quality RTV silicone
sealant to the threads to prevent leaks and install the sensors
into the threaded openings in the PVC pipe. Over-tightening
can damage the parts and/or strip the threads cut into the plastic
pipe.
Sensor connections:
The sensors are connected to the pool heater from the factory.
The return sensor is a two-wire sensor and the supply sensor is
a four-wire sensor. Disconnects are provided for each sensor.
If disconnected to facilitate installation, re-connection is
necessary after installation. If sensors must be located further
than allowed by the cables provided, any extension cabling must
be of equivalent type and wire gauge (see Table 5B on page 44 of
this manual for recommended gauges). IMPORTANT: If the
unit is to be installed outdoors, weatherproof connections must
be provided over all sensor connections.
HEAD LOSS (FT)
1.67
1.88
2.14
3.37
2.37
3.72
WHERE USED
3.9
CP502, CP652, CP752
4.4
CP502, CP652, CP752
4.9
CP992, CP1292, CP1442
7.8
CP1802, CP2072
5.5
CP992, CP1292, CP1442
8.6
CP1802, CP2072
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