Combustion Air And Vent Pipe - Dunkirk Q95M-200 Installation Manual

between such safety valve and the atmosphere.
Installation of the safety relief valve shall conform
to ANSI/ASME Boiler and Pressure Vessel Code,
Section IV. The manufacturer is not responsible for
any water damage.
SUPPLY AND RETURN LINES
The packaged boiler unit is set up to receive 1¼"
NPT return piping from the rear of the unit with an
option for left or right return connections. 1¼" NPT
supply piping exits the boiler jacket at the top of the
unit.
NOTE: Circulator pump and isolation valves are furnished
within a carton inside the boiler cabinet and can be installed
at the installer preferred location.
CONDENSATE DRAIN PIPING
The condensate trap is integral to the boiler.
Provide ½" pipe and fittings for PVC condensate
drain line. Condensate drain line to be pitched
down to floor drain at a minimum of ¼" per foot.
The ½" diameter schedule 40 PVC condensate
drain piping and pipe fittings must conform to ANSI
standards and ASTM D1785. Schedule 40 PVC ce-
ment and primer must conform to ASTM D2564.
In Canada, use CSA or ULC certified schedule 40
PVC drain pipe and cement.
A condensate pump with a reservoir (not furnished)
may be used to remove condensate to a drain line
(sanitary line) above boiler if a floor drain is not
available or is inaccessible.
CONNECTIONS AND TERMINATION
For boilers connected to gas vents or chimneys,
vent installations shall be in accordance with Part
7, Venting of Equipment, of the National Fuel Gas
Code, ANSI Z223.1-latest revision, CSA-B149.1
and B149.2, and applicable provisions of the local
building codes.
Provisions for combustion and ventilation air must
be in accordance with Section 5.3, Air For Com-
bustion and Ventilation, of the National Fuel Gas
Code, ANSI Z223.1-latest revision, CSA-B149.1
and B149.2, or applicable provisions of the local
building code.
VIII - COMBUSTION AIR AND VENT PIPE
11
FILLING CONDENSATE TRAP WITH WATER
IMPORTANT: On initial start up the condensate
trap must be manually filled with water.
The following are the steps required to initially fill
the condensate trap for start up, these steps are
only required at the initial start up or if maintenance
requires draining of the condensate trap:
1. Pour about 1 cup of cold tap water into the
vent drain line.
2. Excess water should go through the overflow
and out through the condensate drain line. Ver-
ify proper operation of the drain line (or external
condensate pump if used).
3. Reinstall the vent drain line.
CHILLED WATER PIPING
The boiler, when used in connection with a refrig-
eration system, must be installed so the chiller me-
dium is piped in parallel with the boiler with appro-
priate valves to prevent the chilled medium from
entering the boiler.
The boiler piping system of a hot water boiler con-
nected to heating coils located in air handling units
where they may be exposed to refrigerated air cir-
culation must be equipped with flow control valves
or other automatic means to prevent gravity circu-
lation of the boiler water during cooling cycle.
These boilers require a dedicated direct vent sys-
tem. All air for combustion is taken directly from
outdoors through the combustion air intake pipe.
All flue products are discharged to the outdoors
through the vent pipe. Insulate lengths of combus-
tion pipe in unconditioned areas.
1. See Figures 1 through 5 for combustion air
and vent pipe roof and sidewall termination (roof
termination is preferred). Combustion air and
vent pipes must terminate together in same at-
mospheric pressure zone as shown. Construc-
tion through which vent and air intake pipes may
be installed is a maximum 24" and a minimum
¼" thickness.