Lochinvar F0600187510 - Manual (Page 46)

Commercial Pool Heaters
OPERATION Continued
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.
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
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:
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.
TABLE-R
Minimum Pump Performance
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
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.
ƽ
WARNING: Should overheating occur or the
gas supply 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
.
46
High Water Temperature Limit Control
This pool heater is equipped with a fixed setting, auto reset high
water temperature limit control that is screwed into the outlet head
in the heat exchanger. This temperature limit control has a
maximum limit setting of 200°F (93°C). It is also equipped with an
adjustable setting, manual reset high water temperature limit
control. This temperature limit control has a maximum limit
setting of 230°F (110°C). If water temperature exceeds the set point,
the limits will break the control circuit and shut down the pool
heater. The auto reset limit control will only be reset after the water
temperature has cooled below the set point of the limit. The manual
reset limit control will require an operator to push the reset button
(located immediately below the high limit dial) if this limit has
tripped.