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GAS-FIRED BOILER
PART 5: BOILER PIPING
10. The Safety Relief Valve is installed at the
factory. Pipe the discharge of the safety relief
valve to prevent injury in the event of pressure
relief. Pipe the discharge 6" above the drain to
a drain. Provide piping that is the same size as
the safety relief valve outlet. Never block the
outlet of safety relief valve.
Figure 5-1
32
30
28
26
24
22
20
18
16
14
12
10
8
6
4
2
0
* NOTE: The recommended circulators are based on 1 gpm per 10,000 btu/hr with 20°∆t.
Figure 5-2
P
1
T
5
/ 0
T
8
0
8 /
0
M
0
0
7
1
4
0
M
0
0
1
0
1
9
9
M
0
0
1
1
3
9
9
M
1
4
0
0
5 -
0
Note: SuperStor Ultra Indirect pump assumes the following: (6) 90 degree elbows and (1) tee on the run of 20' and 1" of copper tube size,
but does not include any flow checks or zone valves.
*See drawings on the following pages
15
(CONTINUED)
5
10
15
Flow in Gallons per Minute
CIRCULATOR SIZING CHART
for Central Heating Circulator (P1)* and SuperStor Ultra Circulator (P2)*
T
a
c
o
P
2
0
0
9
U
P
0
0
1
1
0
0
1
3
1
4
0
0
5 -
0
H. CIRCULATOR SIZING
The Munchkin Boiler Heat Exchanger does have
pressure drop which must be considered in
your system design. Refer to the graph in Fig. 5-
1 below for pressure drop through the
Munchkin Boiler Heat Exchanger for recom-
mended pump selection at a 20∆t design.
20
25
30
MUNCHKIN 399M
G
u r
n
d
o f
s
P
1
P
S
1
5
5 -
8
F
S
P
D
2 -
U
P
S
1
5
5 -
2
6
6 -
4
F
2
6
2
6
9 -
6
F
2
6
U
P
S
3
2
1 -
6
0
U
P
S
Boiler Manual
35
37.5
40
B
e
l l
&
2
P
1
8
F
S
P
D
3 -
N
R
F
2 -
2
9 -
6
F
N
R
F
3 -
3
9 -
6
F
N
R
F
3 -
6
3
2
1 -
6
0
P
L
5 -
5
G
o
s s
e
t t
P
2
N
R
F
2 -
2
N
R
F
3 -
6
N
R
F
3 -
6
P
L
5 -
5
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