Filter
Top Products
34
4 Water connections
Figure 4-1_Water Connections - Models 502 - 752
2" NPT
WATER
INLET
2" NPT
WATER
OUTLET
INSPECTION
PLUGS
Figure 4-2_Water Connections - Models 992 - 2072
2-1/2" NPT
WATER
INLET
2-1/2" NPT
WATER
OUTLET
INSPECTION
PLUGS
Installation & Operation Manual
Circulating pump
1. This pool heater is factory supplied with a properly sized
pump that circulates water between the pool heater and
system.
2. The pump is sized to pool heater input and water
hardness. See Water Chemistry on page 45.
3. Lubricate the pump to the manufacturer’s
recommendations. Pump damage due to inadequate
lubrication is non-warrantable. Use SAE 30 non-detergent
oil or lubricant specified by the pump manufacturer.
4. Standard pool heaters are furnished with the following
circulating pump mounted in the factory supplied pool
loop.
502 - 752 Models
1/4 HP, 120 VAC, 5.8 Amp
992 - 1442 Models
1/2 HP, 120 VAC, 7.4 Amp
1802 - 2072 Models
3/4 HP, 120 VAC, 8.8 Amp
This pump is sized based on installation of a single pool heater
in close proximity with the system. If the number of fittings and
straight pipe exceeds the quantities shown in this section, a larger
pump will be required. As an alternative to changing the pump
in these circumstances, the piping can be changed to a sub-loop.
Check pump for correct pump rotation.
The standard pump selection is based on the following pipe and
fittings from the pool heater to the system:
TABLE - 4A
Pipe Sizing Chart
502 - 752 Models
Number of units
Common Pipe Size
(Min.)
12"
23"
3 3 1/2"
44"
55"
65"
992 - 2072 Models
Number of units
Common Pipe Size
(Min.)
1 2 1/2"
24"
34"
45"
56"
66"
Install piping from the filter system to the pool heater as
shown in the pool heater piping diagrams. See Figures 34 - 38.
Minimum pipe diameter to and from the installed pool heater
to the filter system piping on models 502 - 752 is 2" and on
models 992 - 2072 Btu/hr the minimum is 2-1/2". The piping
from the filter system to the pool heater may be PVC, CPVC
or Copper Pipe. The piping from the pool heater back to the
filter system will carry water with temperatures in excess of
110°F and must be CPVC or Copper Pipe. The temperature
of the heated water from the pool heater will be substantially
cooled as it is mixed back into the pool water from the filter
system and returned to the pool. The mix of heated water and
pool water from the filtration system should only be slightly
warmer than the pool water before the connections from the
pool heater.