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Air-Separation/Expansion Tank
All heaters should be equipped with a properly-sized
expansion tank and air separator fitted at the highest point
in system.
Primary/Secondary Piping - H Models Only
NOTE: All hot water heating systems have unique levels
of operating diversity that must be accounted for in
the system design. The system should always include
adequate system flow in excess of the connected heater
flow for proper operation of the primary/secondary
system. Where the system flow may drop below the
connected heater flow a buffer/decoupler may be needed.
Failure to design for adequate flow (i.e. bypasses, 3-way
control valves, flow-limiting balance devices, buffer
tanks, etc.) will result in heater short-cycling and may
reduce heater life. Always contact your local Raypak
representative for system design assistance to avoid
these issues.
MBTUH (kW/h)
Model
H7-
Input
Output
300
288
300B
(88)
(84)
399
383
400B
(117)
(112)
500
480
500B
(147)
(141)
650
624
650B
(191)
(183)
800
768
800B
(235)
(225)
1000
960
1000B
(294)
(281)
MBTUH (kW/h)
Model
WH7-
Input
Output
300
288
300B
(88)
(84)
399
383
400B
(117)
(112)
500
480
500B
(147)
(141)
650
624
650B
(191)
(183)
800
768
800B
(235)
(225)
1000
960
1000B
(294)
(281)
Pipe sizing based on not exceeding 8 feet per second velocity.
ΔP = Feet of Head.
SHL = System Head Loss of heater plus 100 equivalent feet (30 m) of pipe.
Max flow may require larger than 3 inch piping to not exceed max velocity.
16
20 °F ΔT
30 °F ΔT
GPM
ΔP
GPM
(L/min)
ft.wc.(kPa)
(L/min)
29
6
19
(110)
(18)
(72)
38
11
26
(144)
(33)
(97)
48
12
32
(182)
(36)
(121)
62
11
42
(235)
(33)
(158)
77
12
51
(291)
(36)
(194)
96
14
64
(363)
(42)
(242)
Up to 15 GPG
GPM
ΔP
ΔT-ºF (ºC)
(L/min)
ft.wc.(kPa)
16
37
10
(9)
(140)
(30)
21
37
10
(12)
(140)
(30)
22
44
11
(12)
(167)
(33)
21
59
10
(12)
(223)
(30)
21
74
11
(12)
(280)
(33)
22
88
12
(12)
(333)
(36)
Table L.
Heater Rates of Flow for Various System Pipe Sizes
Applications and Modes - Primary/
Secondary Piping
®
The VERSA IC
applications. The installer/design engineer should refer
to the following Modes to determine which best fits the
intended application and functionality for the unit being
installed.
Type H models of XFiire have three modes available to
them to address the various applications the units can
be applied to. For detailed information on the VERSA IC
system, see the VERSA IC manual (5000.72). This manual
can be found in the document library at www.raypak.com.
Min Flow
ΔP
GPM
ΔP
ft.wc.(kPa)
(L/min)
ft.wc.(kPa)
3
15
2
(9)
(56)
(6)
5
20
3
(15)
(74)
(9)
6
25
4
(18)
(93)
(12)
5
32
3
(15)
(121)
(9)
6
39
4
(18)
(149)
(12)
6
49
4
(18)
(186)
(12)
Min Flow
SHL
GPM
ΔP
ft.wc.(kPa)
(L/min)
ft.wc.(kPa)
14
28
6
(42)
(106)
(18)
14
28
6
(42)
(106)
(18)
16
33
6
(48)
(125)
(18)
17
44
6
(51)
(164)
(18)
22
55
7
(66)
(208)
(21)
24
66
7
(72)
(250)
(21)
system is designed for a wide range of
Max Flow
GPM
ΔT-ºF (ºC)
(L/min)
ft.wc.(kPa)
39
38
(22)
(144)
(30)
39
50
(22)
(189)
(51)
39
62
(22)
(235)
(60)
39
80
(22)
(303)
(51)
39
90
(22)
(341)
(48)
39
90
(22)
(341)
(36)
Max Flow
GPM
ΔT-ºF (ºC)
(L/min)
ft.wc.(kPa)
21
38
(12)
(144)
(30)
27
50
(15)
(189)
(51)
29
62
(16)
(235)
(60)
28
80
(16)
(303)
(51)
28
90
(16)
(341)
(48)
29
90
(16)
(341)
(36)
ΔP
ΔT-ºF(ºC)
10
15
(8)
17
15
(8)
20
15
(8)
17
16
(9)
16
17
(9)
12
21
(12)
ΔP
ΔT-ºF (ºC)
10
15
(8)
17
15
(8)
20
15
(8)
17
16
(9)
16
17
(9)
12
21
(12)
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