Raypak 902B, 302B 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 following 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.

TANK SENSOR

Fig. 13: Single Domestic Hot Water Heater and Storage

Tank

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.

Pool Heating

CAUTION: Power to the heater should be interlocked 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 properly 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 circulate water through the heater from the main sys- tem piping.

To complete the installation of the pool heater, the pool thermostat needs to be installed in the main return wa- ter line, upstream of the heater. This will ensure that the heater will be energized at the right time. If the main water line is too far away from the heater and the capillary bulb will not reach it, locate the pool thermo- stat adjacent to the main line and run wires back to the heater.

Model	Soft (0-4 grains per gallon)					Medium (5-15 grains per gallon)					Hard* (16-25 grains per gallon)
No.	∆T	gpm	∆P	MTS	SHL	∆T	gpm	∆P	MTS	SHL	∆T	gpm	∆P	MTS	SHL
302B	13	40	2.0	2	5.1	10	52	3.3	2	8.3	7	74	6.6	2	16.3
402B	17	40	2.0	2	5.1	13	52	3.4	2	8.4	9	74	6.8	2	16.4
502B	21	40	2.1	2	5.2	16	52	3.5	2	8.6	12	73	6.9	2	16.3
652B	28	40	2.2	2	5.3	20	55	4.1	2	9.7	15	72	7.0	2	16.2
752B	30	42	2.6	2	6.0	17	73	7.5	2	16.9	14	90	11.3	2	25.1
902B	30	51	3.9	2	8.7	21	73	7.8	2	17.2	17	90	11.7	2	25.5

∆T = Temperature rise, °F

∆P = Pressure drop through heat exchanger, ft

SHL = System head loss, ft. Includes 50 eq ft of tubing each way (total 100 eq ft). gpm = Gallons per minute, flow rate

MTS = Minimum tubing size

*Must utilize optional cupro-nickel tubes. If over 25 grains per gallon, a water softener/treatment system must be utilized.

Caution: For scale free operation with "Hard Water" (16-25 grains per gallon of total hardness), the operating control must NOT be set higher than 130 °F. For higher than 130 ° Foperation, a water softener/treatment system must be utilized.

Table I: Domestic Water Heater Flow Rate Requirements

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