Venting & Condensate Drain - Modine Manufacturing PTC Installation And Service Manual

InsTAllATIon - venTIng & CondensATe drAIn
figure 13.1 - Adapter Box with Combustion Air
Intake Pipe Attached
Combustion Air
Pipe Attached
(See Dimension C)
Combustion Air
Intake Guard ➀
model size A B
55-135 12.25" 14.63"
156-260 13.39" 18.88"
310 15.27" 17.00"
➀ F or reference only for horizontal concentric vent arrangements.
D11. Install the vent pipe by extending the vent pipe all the way
through the concentric vent adapter assembly. Seal the
adapter around the pipe using caulk.
D12. Attach the combustion air intake and vent pipe
terminations as follows:
for vertical Concentric vent Kits
(refer to figure 12.1):
• Slide the combustion air cap down over the vent pipe
and fasten it to the combustion air pipe with at least
3 corrosion-resistant sheet metal screws.
• Terminate the vent pipe with a elbow/tee combination
with guards.
• Caulk the gap between the combustion air cap and the
vent pipe with silicone sealant or other appropriate caulk.
for Horizontal Concentric vent Kits
(refer to figure 12.3):
• Attach the combustion air intake guard using corrosion
resistant screws at the end of the combustion air intake
pipe to prevent animals and debris from entering (see
Figure 13.1).
• Solvent weld (glue) the vent termination (elbow or tee) to
the vent pipe.
• Install the vent screen(s) in the elbow or tee.
D13. Install the vent and combustion air pipe between unit
heater and concentric vent adapter box as outlined in
"Section A – General Instructions – All Units".
D14. Once venting is complete, proceed to the following section
titled "Condensate Drain and Trap Installation".
Condensate drain and Trap Installation
During operation, condensate is both produced in the heater
and the venting system. The installation requires condensate
drain systems from the secondary heat exchanger and from the
vent pipe. A condensate trap kit is provided with the unit and
consists of 2 specially designed traps and 1 PVC elbow for the
unit condensate drain connection.
1. For proper heater and vent system performance, the
condensate drain system must include a trap for each as
shown in Figure 8.1 and Figure 10.1. All joints must be
watertight to prevent leakage of condensate.
A
C
6" 4.57"
6"
8"
2. Local code permitting, the condensate drain systems may be
joined after the traps and connected to a sanitary drain
within the building. Because the condensate produced is
acidic, some municipalities may require that the condensate
be neutralized before being discharged into the sanitary
sewer. A condensate neutralizer tube kit is available from
Modine to reduce the pH of the condensate. A separate
neutralizer tube is required for both the vent drain and the
heater drain, but a single tube can be used for drains that
are joined after the traps providing the tube is installed after
the junction. Refer to the instructions that come with the kit.
3. Unions are recommended to permit maintenance of the
drains and to facilitate service of the heater. A union is
B
shown on both sides of each trap.
4. Connect the threaded side of the PVC elbow supplied to the
secondary heat exchanger condensate drain with the socket
connection oriented as shown in Figures 8.1 and 10.1.
5. A vacuum breaker is required after each trap as shown in
Figures 8.1 and 10.1. The vacuum breaker should be
constructed so that dirt and debris do not enter and clog the
drain system.
6. For safe operation, the traps should be primed with water.
The traps must be installed with the higher side connected to
the heater and the lower side connected to the drain.
7. If there is an opportunity that the temperature in the space
will fall below freezing during non-operating periods, the
condensate drain systems and secondary heat exchanger
must be completely drained to prevent freeze damage.
Alternately, heat tape can be applied to the drain pipe
system in accordance with the heat tape manufacturers
instructions.
8. Once the condensate drain lines are complete, proceed to
the following section, "Installation - Gas Connections".
figure 13.2 - drain Trap
figure 13.3 - vacuum Breaker example
6-563.7
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