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Potable Water and Space Heating
1. All piping materials and components connected to
the water heater for the space heating application
shall be suitable for use with potable water.
2. Toxic chemicals, such as used for boiler treatment,
shall not be introduced into the potable water used
for space heating.
3. If the heater will be used to supply potable water,
it shall not be connected to any heating system or
components previously used with a non-potable
water heating appliance.
4. When the system requires water for space heating
at temperatures higher than 140°F, a means such
as a mixing valve shall be installed to temper the
water in order to reduce scald hazard potential.
CAUTION: When this heater is used for both
potable water and space heating, observe the follow-
ing to ensure proper operation.
Fig. 13: Single Domestic Hot Water Heater and Storage
Tank
Soft (0-4 grains per gallon) Medium (5-15 grains per gallon) Hard* (16+ grains per gallon)
Model
No.
T
gpm
P
MTS SHL
T
gpm
P
MTS SHL
T
gpm
P
MTS SHL
302A 13 40 2.0 2 4.3 10 52 3.3 2 7.1 6 90 9.8 2 20.3
402A 17 40 2.0 2 4.4 13 52 3.4 2 7.2 8 90 10.0 2 20.5
502A 21 40 2.1 2 4.5 16 52 3.5 2 7.4 9 90 10.4 2 20.9
652A 28 40 2.2 2 4.6 20 55 4.1 2 8.4 12 90 10.8 2 21.3
752A 30 42 2.6 2 5.2 20 63 5.7 2 11.1 14 90 11.3 2 21.8
902A 30 51 3.9 2 7.6 20 76 8.4 2 16.1 17 90 11.7 2 22.2
Table I: Domestic Water Heater Flow Rate Requirements
Pool Heating
The Hi Delta pool heater is equipped with an external
pump and bypass arrangement as standard equip-
ment. This arrangement blends outlet water with the
inlet water to increase the inlet water temperature,
thereby reducing the likelihood of condensation form-
ing on the heat exchanger. The pump also serves to
CAUTION: Power to the heater should be inter-
locked with the main system pump to make sure the
heater does not fire without the main system pump in
operation. Improper flow control can damage the
heater. Uncontrolled flow (too high) or restricted flow
(too low) can seriously damage the heater. Follow
these instructions to make sure your heater is prop-
erly installed.
ΔT = Temperature rise, °F
ΔP = Pressure drop through heat exchanger, ft
SHL = System head loss, ft (based on heater and tank placed no more than 5 ft apart and equivalent length pipe/fittings of 2” tube = 25 ft)
gpm = Gallons per minute, flow rate
MTS = Minimum tubing size
* Must use optional cupro-nickel tubes. If over 25 grains per gallon, a water softening system must also be used