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Three-Way Valves
Three-way valves intended to regulate system water
temperatures by reducing flow in the boiler should not
be used. Raypak heaters are high-recovery, low-mass
heaters which are not subject to thermal shock. See
Fig. 16 and instructions on page 17 for adjusting the
manual bypass.
Domestic Hot Water
When designing the water piping system for domestic
hot water applications, water hardness should be con-
sidered. Table G indicates the suggested flow rates for
soft, medium and hard water. Water hardness is ex-
pressed in grains per gallon.
Fig. 14: Single Domestic Hot Water Heater and Storage
Soft (0-4 grains per gallon)
Model
No.
T gpm
503
17
50
3.6
753
26
50
4.0
1003
30
58
6.0 2-1/2 7.2
1253
30
73
10.4 2-1/2 12.1
1503
30
87
16.0 2-1/2 18.5
1753
30
102 22.7 2-1/2 26.0
2003
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 50 eq. ft. of tubing)
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 F operation, a water softener/treatment system must be utilized.
SYSTEM
SUPPLY
SYSTEM
RETURN
Tank
Medium (5-15 grains per gallon)
MTS
SHL
P
T
2
5.9
17
2
6.3
20
20
20
23
27
30
Table G: Domestic Water Heater Flow Rate Requirements
NOTE: If local codes require a vacuum relief valve,
acquire
one
manufacturer's instructions.
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.
4. When the system requires water for space heating
at temperatures higher than 140°F (60°C), 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 heat-
ing application, ensure that all the following installation
requirements are met.
gpm
MTS
SHL
P
50
3.6
2
65
6.4
2
10.2
87
12.0
2-1/2
14.4
109
21.0
2-1/2
24.6
113
25.7
2-1/2
29.6
113
27.4
2-1/2
31.3
116
32.0
2-1/2
36.1
16
locally
and
install
Hard* (16-25 grains per gallon)
gpm
T
P
5.9
9
95
10.4
13
100
13.8
15
113
18.7
19
113
22.3
23
113
25.7
27
113
27.4
30
116
32.0
per
valve
MTS
SHL
2
18.1
2
22.2
2-1/2
22.6
2-1/2
26.3
2-1/2
29.6
2-1/2
31.3
2-1/2
36.1
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