10
Figure 21. Harness Routing
20. Continue to route the harness down through any
available grommet hole. See Figure 22.
Figure 22. Harness Routing Continued
21. Wire the harness along with the installed gas valve
harness per the wiring diagram.
22. Reinstall the (4) Phillips screws that hold the control
panel to the heater. See Figure 19.
23. Place the front door back onto the heater. Refer to
Figure 3.
6. VENTING
The D-2 Power Vent operates with a positive vent static
pressure and with a vent gas temperature that prevents
excessive condensate production in the vent, and requires
Category III venting.
The 4" collar atop the D-2 Power Vent requires a gasket-
to-gasket ue adapter in order to properly connect to your
selected brand of 4" Category III ue pipe. Contact your
HVAC distributor.
The total length of run shall not exceed an equivalent
length of 100 ft (30.5 m) of Category III venting, including
the termination cap. For all cases, each 90° elbow reduces
the maximum vent run by 10 ft (3 m) and each 45° elbow
reduces the run by 5 ft (31.5 m). A maximum of four (4)
90-degree elbows is allowed. The vent must be installed
properly to prevent the ue gas leakage within the heater.
The vent pipe must be certied with Category III usage on
systems which have ue gas temperatures of less than
400°F (204°C). Care must be taken during the assembly
to ensure that all joints are properly sealed.
For appliances installed in extremely cold climates, it is
recommended that:
• The vent be installed with a slight upward slope of
not less than 1/4" per foot of horizontal run to the vent
terminal. In this case, an approved condensation
trap must be installed per applicable codes.
• The vent be insulated through the length of the
horizontal run.
The point of discharge of the D-2 Power Vent shall not be
less than 7 ft (2.1 m) above grade where located adjacent
to public walkways. It must also be at least 3 ft (0.9 m)
above any forced air inlet located within a 10 ft (3 m)
radius.
For installations which terminate vertically, a eld-supplied
Category III vent termination may be used.
For through-the-wall (sidewall) installations, the screened
elbow supplied with the D-2 Power Vent must be used as
the ue termination. Install the elbow so that the screened
end faces directly downwards and is at least 12" (305 cm)
from the wall. Alternate sidewall vent terminations shall not
be accepted; see the National Fuel Gas Code, paragraph
12.4.3.1.
The discharges of multiple sidewall vent terminations
must have at least 12" (30.5 cm) separation.
Raypak does not support common venting of systems
operating under positive vent pressure. Use of separate
cat III vents is strongly recommended. Common cat III
venting, if required, must be handled as an Engineered
Vent System by a Professional Engineer (PE) and is
outside Raypak’s scope.
APPROVED
UNCONTROLLED DOCUMENT IF PRINTED
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