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Cast Iron Condensing Boilers – Installation Manual
Cast Iron Condensing Boilers – Installation Manual
Do not size the gas supply line nominal iron pipe size
based only on the boiler gas inlet connection size. The
gas supply line (feed) to the boiler gas inlet connection
must be designed per an engineered method and
utilizing (Table 8) to ensure that the gas supply piping
is sized properly. Do not neglect the pressure drop due
to pipe fittings. (Table 8) should be used in conjunction
with (Table 9) to ensure that the gas supply piping has
the capacity to meet the demand. If more than one
appliance is supplied by the same supply pipe, the
piping must be sized based on the maximum possible
demand.
Figure 17 depicts the proper way to connect the boiler
to the gas supply piping. The manual shut-off valve
MUST be installed in the supply piping. It should be
installed
5 ft
, 1 m above the floor where required by
local codes. Provide a sediment trap at the bottom of the
vertical section of the gas supply pipe upstream of the
gas controls.
A ground joint union should be installed between the
boiler gas controls and the supply piping. Each of these
items are needed to ensure long life and ease of
servicing. Always use a pipe sealant that is suitable for
use with with the type of gas (NG/LP) being used.
Table 8 - Gas Pipe Capacity
Table 9 - Equivalent Pipe Length Chart
Figure 16 - KN-Series Plus Condensate Drain
CONDENSATE PIPING
The condensate trap provided with the boiler must be
attached to the bottom pan and piped to a suitable floor
drain (consult local code) or condensate pump. If a
condensate neutralization device is required by local
code, it must be positioned prior to boiler room drain. Fill
the condensate trap with water, check and maintain water
level in trap during operation prior to start-up.
GAS SUPPLY PIPING
Check the boiler rating plate to make sure that
the boiler is for the type of gas that
will be used. If it isn’t, do not connect the boiler
to the gas supply. Failure to comply with this
warning can result in extensive property
damage, severe personal injury or death!
The KN+ comes from the factory ready to be piped to
the gas supply. If for any reason the boiler is not for the
type of gas available at the installation site, call your
Advanced Thermal Hydronics representative to resolve
the problem.
Maximum pipe capacity in ft
3
/hr based on 0.60 specific gravity gas
at a pressure of 0.5 psig or less and a 0.3" WC pressure drop.
Nominal
Iron Pipe
Size
Pipe length in feet
10
20
30
40
50
60
80
100
150
Maximum gas volume of pipe (ft
3
/hr)
1"
520 350 285 245 215 195 170 150 120
1
1
/
4
"
1050 730 590 500 440 400 350
305
250
1
1
/
2
"
1600 1100 890 760 670 610 530
460
380
2"
3050 2100 1650 1450 1270 1150 990
870
710
2
1
/
2
"
4800 3300 2700 2300 2000 1850 1600 1400 1130
3"
8500 5900 4700 4100 3600 3250 2800 2500 2000
Note: Multiply the gas volume by 0.62 for propane flow capacity in
ft
3
/hr. Multiply the propane flow capacity by 2500 Btu/ft3 to determine
the propane Btu/hr capacity for a given pipe size and length.
HIGH TURNDOWN TRAP
STANDARD TRAP
Nominal
Iron Pipe
Size
Type of pipe fitting
90° Elbow
Tee
1
Gas Valve
2
Gas Cock
2
Equivalent pipe length, (ft)
1"
2.6
5.2
0.6
1.5
1
1
/
4
"
3.5
6.9
0.8
1.9
1
1
/
2
"
4.0
8.0
0.9
2.3
2"
5.2
10.3
1.2
3.0
Notes: 1. For flow through branch.
2. For flow at full open.
Summary of Contents for KN Series
Page 45: ...45 Cast Iron Condensing Boilers Installation Manual Figure 24 KN6 10 16 20 26 30 and 40 ...
Page 46: ...46 Cast Iron Condensing Boilers Installation Manual Figure 25 KN6 10 16 20 26 30 and 40 ...
Page 47: ...47 Cast Iron Condensing Boilers Installation Manual Figure 26 Gas Train Drain Pan ...
Page 55: ...55 Cast Iron Condensing Boilers Installation Manual ...