Rheem Raypak Delta Limited 399B, Installation And Operation Manual

Page: 18 / 67

18
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.
A CAUTION: When this heater is used for both
potable water and space heating, observe the
following to ensure proper operation.
Fig. 13: Single Domestic Hot Water Heater and Storage
Tank
Table H: Domestic Water Heater Flow Rate Requirements
∆T = Temperature rise, °F.
∆P = Pressure drop through heat exchanger, ft.
SHL = System head loss, ft. (System head loss based on heater and tank placed no more than 5 ft apart and equivalent length pipe/fittings as follows:
2 in. tube = 25 ft; 2 1/2 in. tube = 80 ft.
gpm = Gallons per minute, flow rate.)
MTS = Minimum tubing size.
*Must utilize optional cupronickel tubes.
**With Hard Water (16-25 grains per gallon), the operating control must be set no higher than 130F for scale free operation. For operating tempera -
tures above 130F, a water softener must be utilized.
Model
No.
Soft (0–4 grains per gallon) Medium (5–15 grains per gallon) Hard* (16–25** grains per gallon)
∆T
GPM
(lpm)
∆P
MTS
in. (mm) SHL
∆T
GPM
(lpm)
∆P
MTS
in. (mm) SHL
∆T
GPM
(lpm)
∆P
MTS
in. (mm)
SHL
399B
17
40
(151)
2.0
2
(51)
4.4 13
52
(197)
3.4
2
(51)
7.2 8
90
(341)
10.0
2
(51)
20.5
499B
21
40
(151)
2.1
2
(51)
4.5 16
52
(197)
3.5
2
(51)
7.4 9
90
(341)
10.4
2
(51)
20.9
649B
28
40
(151)
2.2
2
(51)
4.6 20
55
(208)
4.1
2
(51)
8.4 12
90
(341)
10.8
2
(51)
21.3
749B
30
42
(159)
2.6
2
(51)
5.2 20
63
(238)
5.7
2
(51)
11.1 14
90
(341)
11.3
2
(51)
21.8
899B
30
51
(193)
3.9
2
(51)
7.6 20
76
(288)
8.4
2
(51)
16.1 17
90
(341)
11.7
2
(51)
22.2
989B
28
60
(227)
2.7
2.5
(64)
4.6 20
83
(314)
5.2
2.5
(64)
8.6 13
132
(500)
13.1
2.5
(64)
21.0
1259B
30
72
(272)
4.4
2.5
(64)
7.0 20
106
(401)
9.6
2.5
(64)
14.8 16
132
(500)
14.8
2.5
(64)
22.7
1529B
30
86
(325)
7.1
2.5
(64)
10.7 20
132
(500)
16.5
2.5
(64)
24.4 20
132
(500)
16.5
2.5
(64)
24.4
1799B
30
101
(382)
10.7
2.5
(64)
15.5 23
132
(500)
18.3
2.5
(64)
26.1 23
132
(500)
18.3
2.5
(64)
26.1
1999B
30
112
(424)
13.9
2.5
(64)
19.7 26
132
(500)
19.0
2.5
(64)
26.9 26
132
(500)
19.0
2.5
(64)
26.9
2069B
30
116
(439)
14.8
2.5
(64)
21.0 27
132
(500)
19.0
2.5
(64)
26.9 27
132
(500)
19.0
2.5
(64)
26.9
2339B
30
132
(500)
21.4
2.5
(64)
29.3 30
132
(500)
21.4
2.5
(64)
29.3 30
132
(500)
21.4
2.5
(64)
29.3
Gas Supply
A DANGER: Make sure the gas on which the
heater will operate is the same type as specified
on the heater’s rating plate .