Lochinvar GAS HEATER FOR COMMERICAL POOL APPLICATIONS - Manual (Page 46)

Commercial Pool Heaters
46
OPERATION Continued
Pipe Size Requirements
The pipe sizing chart provides the minimum pipe size for
common manifold piping to ensure adequate flow.
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 44.
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.
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:
Minimum Pump Performance
Pump performance is based on providing adequate flow and
temperature rise to prevent scale accumulation in the heat
exchanger. See Water Chemistry on page 44.
Heat Exchanger
This is a highly sophisticated heat exchanger, designed to carry
water in such a way that it generates a scouring action which
keeps all interior surfaces free from build-up of impurities. The
straight-line, two pass design of the tubes sends water into the
headers at a properly rated velocity. The configuration of the
headers, in turn, creates a high degree of turbulence which is
sufficient to keep all contaminants in suspension. This
“scouring action” provides greater cost savings for owners.
Tubes are always able to transfer heat at peak efficiency. Every
surface within this water containing section is of a non-ferrous
material, providing clear, clean, rust-free water. Straight
copper tubes-finned on the outside for maximum heat transfer-
coated cast iron one piece cored headers make up an entirely
rust-proof pool heater. A Cupro-Nickel heat exchanger is
standard on 1,800,000 - 2,070,000 Btu/hr 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.
500,000 - 750,000 Btu/hr Models
1/4 HP, 120 VAC, 5.8 Amp
990,000 - 1,440,000 Btu/hr Models
1/2 HP, 120 VAC, 7.4 Amp
1,800,000 - 2,070,000 Btu/hr Models
3/4 HP, 120 VAC, 8.8 Amp
6 - 90° elbows 2 - ball valves
2 - unions
1 - cold water tee
Not more than 45 feet of straight pipe.
IMPORTANT: For every elbow and tee in excess
of those shown above, deduct 5 feet from the
maximum allowable straight pipe in the pool
heater to the system circulating loop.
Btu/hr Input GPM Ft.Hd.
500,000 - 750,000 55 10
990,000 - 1,440,000 90 15
1,800,000 - 2,070,000 115 18
TABLE-S
Minimum Pump Performance
1 2"
2 3"
3 3 1/2"
4 4"
5 5"
6 5"
1 2 1/2"
2 4"
3 4"
4 5"
5 6"
6 6"
TABLE-R
Pipe Sizing Chart
Number of Units Common Pipe
500,000 - 750,000 Btu/hr Models Size (Min.)
Number of Units Common Pipe
990,000 - 2,070,000 Btu/hr Models Size (Min.)