Install Instructions

DIRECT VENT — Sidewall with separate pipes
Allowable vent/air pipe materials &
lengths
Use only the vent materials and kits
listed in Figure 23, page 24 . Provide
pipe adapters if specifi ed.
1. Locate the termination such that the total air
piping and vent piping from the boiler to the
termination will not exceed the maximum
length given in Figure 22, page 23 .
For polypropylene applications,
comply with any additional
requirements in the vent system
manufacturer’s instructions. Provide
3" PVC transition pieces at the boiler
vent and air connections. Install a
locking collar at every joint.
For AL29-4C vent pipe applications,
comply with any additional
requirements in the vent system
manufacturer’s instructions.
Provide a 3" PVC transition piece
at the boiler vent connection. The
air piping must be PVC or CPVC.
Provide a 3" PVC transition piece
at the boiler air connection if using
2" air piping.
Determine termination location
1. The air and vent terminations must be installed
as shown in Figure 26 and Figure 28, page 29 .
2. The terminations must comply with clearances
and limitations shown in Figure 24, page 26 .
3. Locate the terminations so they are not likely
to be damaged by foreign objects, such as
stones or balls, or subject to buildup of leaves
or sediment.
Do not exceed the maximum
lengths of the outside vent piping
shown in Figure 26 . Excessive
length exposed to the outside could
cause freezing of condensate in the
vent pipe, resulting in potential
boiler shutdown. In extremely cold
climates, install an insulated chase
around the vent piping, particularly
if using longer lengths. The chase
must allow for inspection of the
vent pipe, and insulation must be
protected from water.
Multiple vent/air terminations
1. When terminating multiple boilers, terminate
each vent/air connection as described in this
manual.
All vent pipes and air inlets must
terminate at the same height to
avoid possibility of severe personal
injury, death or substantial property
damage.
Figure 26 INSTALLATION SEQUENCE — Separate pipes sidewall
Step 1 Read and follow all instructions in this manual. DO NOT proceed with
vent/air installation until you have read page 22 through page 27 .
See notices at left.
Step 2 Install the boiler in a location that allows proper routing of all vent and air
piping to the selected sidewall location.
Step 3 Make sure the selected sidewall termination location complies with
Figure 24, page 26 . (Multiple boiler sidewall plates must also comply with
Figure 27, page 29 .)
Step 4 Use only the vent materials listed in Figure 23, page 24 . Provide pipe adapters
where required. Vent piping and air piping lengths must not exceed the
values shown in
Figure 22, page 23 .
Step 5 Prepare the sidewall penetrations and secure the sidewall plates as instructed
in this section. See “Prepare wall penetrations” on page 29 .
See notices at left.
Step 6 The air piping must terminate in a down-turned elbow as shown above.
The vent piping must terminate in an elbow pointed outward or away
from the air inlet as shown above. See illustration above.
Step 7 Install vent and air piping between the boiler and the sidewall openings.
Slope horizontal piping downward toward the boiler at least 1/4 inch per
foot. See
page 39 for general guidelines. See notices at left.
Step 8 Install pipe supports every 5 feet on both the horizontal and vertical runs.
Install a hanger support within 6 inches of any upturn in the piping, or per
vent pipe manufacturer’s instructions.
See notices at left.
Step 9 Attach the vent termination exterior piping: Use either of the confi gurations
shown above, as needed to ensure clearance above grade or snow line.
Step 10 The vent and air pipes may run up as high as 4 feet with no enclosure.
The vent and air pipes must be secured with braces, and all clearances and
lengths must be maintained. Space braces no further than 24 inches apart.
Step 11 External venting greater than 4 feet requires an insulated enclosure around
the vent and air pipes. The vent and air terminations must exit through
the enclosure as shown in the illustration above, maintaining all required
clearances.
USE SWEEP ELBOWS FOR ALL VENT AND AIR PIPING
— DO NOT use short radius elbows for vent or air piping. Boiler
performance could be affected.
Part number 550-100-191/0917
28
®
gas-fired water boiler — 70/110/155 Boiler Manual