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5. WIRING (IID IGNITION)
A
WARNING: Disconnect all electrical power to the
unit before servicing to avoid potential shock injury or
damage to the unit. To change voltages, follow wiring
diagram for correct voltage connections. Improper
wiring connections can burnout the relay and blower
motor.
6. VENTING
The D-2 Power Vent is capable of 360-degree discharge
rotation and operates with a positive vent static pressure
and with a vent gas temperature less than 400°F (204°C).
Use of 4" cat III-certified stainless steel vent material is
mandatory. The total length of horizontal run shall
not exceed an equivalent of 40 ft (12.2 m) including
termination cap. For all cases, each 90-degree elbow
reduces the maximum horizontal vent run by 10 ft (3
m) and each 45-degree elbow in the vent run reduces
the maximum vent run by 5 ft (1.5 m). See Table D for
maximum vent lengths using 90-degree and 45-degree
elbows.
90-Degree Elbows
Maximum
Quantity
Length
ft. (m)
1
30 (9.1)
2
20 (6.1)
3
10 (3.0)
Table D.
Effects of Flue Elbows
The vent size must not be reduced to less than 4" cat III.
It is mathematically possible to increase the vent size, but
such a system is outside Raypak's certification and must
be handled as an Engineered Vent System, approved by
a Professional Engineer.
The D-2 Power Vent uses positive pressure to push flue
gases through the vent pipe to the outside. The vent must
be installed to prevent flue gas leakage. Care must be
taken during assembly to ensure that all joints are sealed
properly and are airtight.
The vent must be installed to prevent the potential
accumulation of condensate in the vent pipes. It is
recommended that:
1. The vent be installed with a slight downward slope
of not more than 1/4" per foot of horizontal run to the
vent terminal.
2. The vent be insulated through the length of horizontal
run.
45-Degree Elbows
Maximum
Quantity
Length
ft. (m)
1
35 (10.7)
2
30 (9.1)
3
25 (7.6)
For appliances installed in extreme cold climate, it is
recommended that:
1. The vent be installed with a slight upward slope of not
more than 1/4" per foot of horizontal run to the vent
terminal. In this case, an approved condensate trap
must be installed per applicable codes.
2. The vent be insulated through the length of the
horizontal run.
The Raypak Power Vent operates with a positive vent
static pressure and with a vent gas temperature that avoids
excessive condensate production in the vent and as such
it is listed as a CATEGORY III appliance.
Exception: When a Power Vent is connected to a vertical
vent of sufficient height to generate a negative draft in the
system. Consult sizing guide or factory.
The D-2 Power Vent assembly is suitable for through-
the-wall venting, and for connection to vent pipes and
breeching smaller than the standard collar for that size of
atmospheric heater.
The D-2 Power Vent assembly includes a wire harness,
shown in Figure 5, which provides quick connections
with the respective controls in the heater control box. The
harness is of sufficient length to fit the appliance for which
it is sized.
The wiring diagrams that follow are for basic on/off units.
The same basic connection logic will apply to staged or
modulating units. Reference the wiring diagram supplied
with each appliance for actual connections.
7
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