9
HYDRONIC PIPING
Consider near boiler piping as part of the boiler for proper
water level control and to produce dry steam.
Correct near boiler piping is crucial to proper operation of
boiler and heating system.
Follow these recommendations carefully.
1.
Place boiler in selected location as near chimney as
possible.
2.
Install safety valve. Figure 5 and Warning on Page 8.
• Install union, if used, close to safety valve outlet.
• Install elbows close to safety valve outlet and
downstream of union (if used).
3.
Boiler is equipped with two 2" supply connections and
two 2" return connections, one each on both left and
right sides of boiler. Plug unused connections with
furnished 2" plug and 2 x
¾
" bushing for drain valve.
4.
When using both supply tappings to pipe system as
shown in Figure 6b , Page 10.
• Fit headers with header offsets, swing joints, or equip
with expansion joints, so thermal expansion and
contraction of header does not damage boiler. Do not
weld headers.
• Place system takeoffs from header between equalizer
and riser to header nearest equalizer. System takeoffs
must never be between two risers. If steam main goes
in two directions, place two takeoffs from header, one
for each main.
5.
Recommended near boiler piping for gravity return
systems is shown in Figure 8 page 11. For gravity return
systems, bottom of lowest steam carrying pipe, dry
return or end of steam main, must be at least 28” above
normal water level line on left side of boiler.
6.
Equip all boilers in gravity return systems
with Hartford
Loop as shown in Figure 6a and 6b page 10.
7.
Piping vertical risers from boiler to header, risers must
be minimum of 24" high above water line.
8.
Steam riser(s) and header shall be 2" pipe.
9.
Equalizer line shall be minimum 1-1/2" pipe size.
10.
Near boiler piping shall include 2" tee with female
adapter and cap located on supply line as shown for
skimming (i.e. surface blow-down).
11.
For pumped return systems, follow condensate pump
or boiler feed pump manufacturer’s instructions for
proper installation and hookup. See Table 4 and Figure
7 page 11.
12.
Connecting cold water supply to water inlet valve,
verify clean water supply is available. When water
supply is from well or pump, install sand strainer at
pump.
Table 4 - Steam Flow Rates (Gross)
Sections
Flow Rates LBS/HR
3
63.4 LBS/HR
4
94.7 LBS/HR
5
126.8 LBS/HR
6
158.1 LBS/HR
7
190.2 LBS/HR
8
221.5 LBS/HR
9
252.8 LBS/HR
