15
8 - BOILER ASSEMBLY
NOTICE
Do not install valve between boiler and controls
manifold or relief valve.
14.
Check installation of liners and baffles (Not all
models). See Table 4.
A.
Check oval (4 section) or V-shaped (6 and 7 section)
liner. See Figures 11 and 12
. Liner should be flush
with front edge of heat exchanger fins.
B.
Flue way baffles (4, 5, 6 section only) are factory
installed in 3rd pass. 4 section boiler uses twelve
Type A baffles, six left hand and six right hand. 5
and 6 section boiler uses two Type B baffles. Insure
baffles are inserted in flue way such that position
tab touches casting between 2nd and 3rd Pass flue
way. See Figures 13a, 13b, 13c.
Efficiency of boiler is based on insertion of flue way baffles
in 4, 5 and 6 section units. Baffles will generate lower
gross stack temperatures entering chimney. This has the
potential under certain operating conditions to cool flue
gases below dew point, creating condensation on interior
chimney and chimney connector surfaces. Remove baffles
to increase stack temperature if there are any signs of
condensation in chimney or chimney connector. Removing
baffles alone may not address condensation depending on
other boiler and heating system operating conditions.
10.
Locate cast 1-1/4 x 1-1/4 x 3/4 tee and assemble on
1-1/4" x 10" nipple with 3/4” tapping facing toward
front of boiler and joint is water tight.
11.
Install Limit control mounting plug in upper 3/4”NPT
port facing front. See Figure 7.
12.
Install Limit control & harness assembly. Loosen
mounting screw on bottom of limit control.
A. Mount control on mounting plug and tighten screw
to secure control. See Figure 7.
B.
Confirm thermal limit/LWCO sensor bulb is fully
inserted to bottom of control well in top of rear
boiler section and secured with grommet. See
Figure 8.
C. Route thermal limit/LWCO sensor wire to control
and connect. See Figure 10, and Figure 15.
WARNING
Burn and scald hazard. Relief valve could
discharge steam or hot water during operation.
Check local codes for maximum distance from floor
or allowable safe point of discharge. Installation of
relief valve shall be consistent with ANSI/ASME Boiler
and Pressure Vessel Code, Section IV.
!
13.
Install Relief Valve.
See Figures 6 and 9.
A. DO NOT pipe in area where freezing can occur. DO
NOT install shutoff valves, plugs or caps.
B. Locate 3/4”NPT x 90° street elbow. Install elbow
using 3/4” NPT tapping in supply piping. Install
elbow with outlet facing directly up. Install relief
valve with outlet facing horizontally.
C.
Pipe discharge of relief valve. Installation of relief
valve must be consistent with ANSI/ASME Boiler and
Pressure Vessel Code, Section IV
MOUNTING
PLUG
Figure 7 - Control On Mounting Plug w/Screw
SENSOR IN WELL
WITH GROMMET
Figure 8 - Grommet
Figure 9 - Relief Valve
NOTICE
Flue gas condensate is corrosive, which requires
special consideration and must be addressed
immediately.
PN 240013278, Rev. A [12/31/2020]
