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3
Pre-Installation and Boiler Mounting
!
WARNING
Asphyxiation Hazard.
Adequate combustion and ventilation air must
be provided to assure proper combustion. Install
combustion air intake per Section 4 "Venting".
G. General.
1. Apex boilers are intended for installations in
an area with a floor drain, or in a suitable drain
pan to prevent any leaks or safety relief valve
discharge resulting in property damage.
2. Apex boilers are not intended to support
external piping and venting. All external piping
and venting must be supported independently
of the boiler.
3. Apex boilers must be installed level to prevent
condensate from backing up inside the boiler.
4. Boiler Installation:
a. For basement installation provide a
solid level base such as concrete where
floor is not level or where water may be
encountered on the floor around boiler.
Floor must be able to support weight of
boiler, water and all additional system
components.
b. Boiler must be level to prevent condensate
from backing up inside the boiler.
c. Provide adequate space for condensate
piping or a condensate pump if required.
Table 3-2: Vent Pipe Clearances to Combustible Material
Listed Direct
Vent System
Standard
Two-Pipe CPVC/PVC Vent and PVC Combustion Air Intake
Optional
Two-Pipe Rigid Polypropylene Vent (or, Flexible Polypropylene
Liner for Vertical Venting only) and Rigid Polypropylene or PVC
Combustion Air Intake
Optional
Two-Pipe Stainless Steel Vent and Galvanized Steel or PVC
Combustion Air Intake
10
APEX
(continued)
Boiler Clearances to Combustible (and Non-
Combustible) Material:
Models APX425C and APX525C:
These boilers are listed for closet installation with the
following minimum clearances – Top = 1 in. (25 mm),
Front = 1 in. (25 mm), Left Side = 10 in. (250 mm),
Right Side = 2 in. (50 mm), Rear = *6 in. (150 mm)
Models APX625C, APX725C and APX825C:
These boilers are listed for alcove installation with the
following minimum clearances – Top = 1 in. (25 mm),
Front = Open, Left Side = 10 in. (250 mm), Right Side
= 2 in. (50 mm), Rear = *6 in. (150 mm)
* Note:
When boiler is vented vertically, the minimum
clearance from the rear of the jacket is increased
to 18 in. (460 mm) with a short radius 90° elbow
provided in order to provide adequate space at boiler
rear for installation of vent and air intake piping and
service access.
Boiler Service Clearances – Applicable to all Boiler
Models:
Top = 24 in. (610 mm), Front = 24 in. (610 mm), Left
Side = 24 in. (610 mm), Right Side = 24 in. (610 mm),
Rear = 24 in. (610 mm)
The above clearances are recommended for service
access but may be reduced to the Combustible
Material Clearances provided:
1. The boiler front is accessible through a door.
2. Access is provided to the condensate trap
located on the left side of boiler.
3. Access is provided to thermal link located at
the boiler rear.
Vent Pipe
Vent Pipe Material
Direction
CPVC/PVC
Rigid Polypropylene (or,
Flexible Polypropylene
Vertical or
Liner for Vertical Venting
Horizontal
only)
Stainless Steel
Installation, Operating, & Service Instructions
Vent Pipe
Enclosure
Nominal Diameter
3 in. (80 mm),
4 in. (100 mm or 110 mm),
6 in.( 150 mm or 160 mm)
3 in. (80 mm),
Unenclosed
4 in. (100 mm or 110 mm),
at all Sides
6 in.( 150 mm or 160 mm)
3 in. (80 mm),
4 in. (100 mm or 110 mm),
6 in.( 150 mm or 160 mm)
Minimum
Clearance to
Combustible
Material
1 in. (25 mm)
1 in. (25 mm)
1 in. (25 mm)
106308-05 - 3/23
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