Raypak 302A-902A manual Potable Water and Space Heating

Potable Water and Space Heating

CAUTION: When this heater is used for both potable water and space heating, observe the follow- ing to ensure proper operation.

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.

Fig. 13: Single Domestic Hot Water Heater and Storage

Tank

Pool Heating

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.

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

Model	Soft (0-4 grains per gallon)					Medium (5-15 grains per gallon)					Hard* (16+ grains per gallon)
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

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

Table I: Domestic Water Heater Flow Rate Requirements

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