Raypak 503-2003 manual Potable Water and Space Heating, Pool Heating

SECTION C: Installation

Fig. 12: Single Domestic Hot Water Heater and

Storage Tank

Potable Water and Space Heating

CAUTION: When this heater is used for both potable water and space heating, observe the following to en- sure 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.

Pool Heating

When a boiler or water heater is used in a pool heating application, ensure that all the following installation requirements are met.

CAUTION: Power to the heater should be interlocked with the main system pump to ensure the heater does not fire without the main system pump in operation. Improper flow control can damage the heater. Uncon- trolled 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 MVB must be equipped with a field-supplied ex- ternal pump and bypass arrangement. This arrangement blends outlet water with the inlet water to increase the inlet water temperature to a minimum of 120°F, 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.

Model	Soft (0-4 grains per gallon)					Medium (5-15 grains per gallon)						Hard* (16-20 grains per gallon)
No.	∆T	gpm	∆P	MTS	SHL	∆T	gpm		∆P	MTS	SHL	∆T	gpm	∆P	MTS	SHL
503	17	50	3.6	2	5.9	17	50	3.6		2	5.9	9	95	10.4	2	18.1
753	26	50	4.0	2	6.3	20	65	6.4		2	10.2	13	100	13.8	2	22.2
1003	30	58	6.0	2-1/2	7.2	20	87	12.0		2-1/2	14.4	15	113	18.7	2-1/2	22.6
1253	30	73	10.4	2-1/2	12.1	20	109	21.0		2-1/2	24.6	19	113	22.3	2-1/2	26.3
1503	30	87	16.0	2-1/2	18.5	23	113	25.7		2-1/2	29.6	23	113	25.7	2-1/2	29.6
1753	30	102	22.7	2-1/2	26.0	27	113	27.4		2-1/2	31.3	27	113	27.4	2-1/2	31.3
2003	30	116	32.0	2-1/2	36.1	30	116		32.0	2-1/2	36.1	30	116	32.0	2-1/2	36.1

∆T = Temperature rise, °F

∆P = 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 of 25 ft of tubing) gpm = Gallons per minute, flow rate

MTS = Minimum tubing size

*Must use optional cupro-nickel tubes. If over 20 grains per gallon, a water softening system must also be used.

Table G: Domestic Water Heater Flow Rate Requirements

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