Power Venting System
Model: PVS-1
for use with
Decorative Gas Appliance Models:
NVC33VN/VP, NVC36VN/VP,
NVC39VN/VP, NVC43VN/VP
INSTALLER/CONSUMER
SAFETY INFORMATION
PLEASE READ THIS MANUAL
BEFORE INSTALLING AND USING
APPLIANCE
WARNING: If the information in this
manual is not followed exactly, a fire
or explosion may result causing prop-
erty damage, personal injury or loss of
life.
FOR YOUR SAFETY
Installation and service must be per-
formed by a qualified installer, service
agency, or the gas supplier.
Do not store or use gasoline or other
flammable vapors and liquids in the
vicinity of this or any other appliance.
FOR YOUR SAFETY
If you smell gas:
Homeowner’s Installation &
Operating Manual
• Do not try to light any appliance.
• Do not touch any electric switch; do
not use any phone in your building.
• Immediately call your gas supplier
from your neighbors phone. Follow
the gas supplier’s instructions.
• If you cannot reach your gas supplier,
call the fire department.
• Open windows / Extinguish all flames.
CERTIFIED
I
PLEASE KEEP THIS MANUAL FOR FUTURE REFERENCE
51810 1/06 Rev. 2
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Majestic® Fireplaces Power Venting System
3. Vent System Termination
Power Venter Specifications
Before installing Power Venter, determine location of
vent system termination.
Electrical
4. Location of the Fan
Motor voltage ....................................115
Control Circuit Voltage ........................24
Hz........................................................60
RPM................................................3000
Watts...................................................95
Amps................................................1.26
Thermal Protection............................Yes
To keep the noise level to a minimum, the fan should
be located as far from the appliance as possible.
A storage cupboard, or laundry area are preferred
locations. Permanent access for inspection and
servicing must be provided.
5. All portions of the vent system under positive pres-
sure during operation (on the outlet side of the
Power Venter) shall be designed and installed so as
to prevent leakage of flue or vent gases into a build-
ing.
Mechanical
Shaded Pole Motor ...........................Yes
Int. Fan Cooled ................................. yes
Shaft Diameter (inch)........................313
Bearings..............................Sleeve Type
General Code Requirements
The exit terminal shall be so arranged that flue gases
are not directed so as to jeopardize the safety of
people, overheat combustible structures or enter
buildings, and that proper clearances are maintained.
Always consult your local codes and authorities. In
the absence of such codes follow the current installa-
tion codes for gas burning appliances CSA-B149.1 in
Canada or ANSI Z223.1/NFPA 54 in the US.
Also see Diagram A - Vent Termination Locations.
3
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Majestic® Fireplaces Power Venting System
General Venting Information - Termination Location
INSIDE
CORNER DETAIL
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AREA WHERE TERMINAL IS NOT PERMITTED
VENT TERMINATION
AIR SUPPLY INLET
X
V
CFM145a
Canadian Installations1
US Installations2
A = Clearance above grade, veranda, porch,
deck, or balcony
12” (30cm)
12” (30cm)
B = Clearance to window or door that may be
opened
6” (15cm) for appliances
6” (15cm) for appliances
< 10,000 Btuh (3kW), 9”
(23cm) for appliances > 10,000
Btuh (3kW) and < 50,000 Btuh
(15kW), 12” (30cm) for
< 10,000Btuh (3kW), 12” (30cm)
for appliances > 10,000 Btuh (3kW) and
< 100,000 Btuh (30kW), 36” (91cm)
for appliances > 100,000 Btuh (30kW)
appliances > 50,000 Btuh (15kW)
C = Clearance to permanently closed window
12” (305mm) recommended to
prevent window condensation
12” (305mm) recommended to
prevent window condensation
D = Vertical clearance to ventilated soffit located
above the terminal within a horizontal
distance of 2’ (610mm) from the center
line of the terminal
18” (458mm)
18” (458mm)
E = Clearance to unventilated soffit
F = Clearance to outside corner
G = Clearance to inside corner (see next page)
12” (305mm)
see next page
see next page
12” (305mm)
see next page
see next page
H = Clearance to each inside of center line
extended above meter/regulator assembly
3’ (91cm) within a height of 15’ (4.6 m)
above the meter/regulator assembly
3’ (91cm) within a height of 15’ (4.6m)
above the meter/regulator assy
I = Clearance to service regulator vent outlet
3’ (91cm)
3’ (91cm)
J = Clearance to nonmechanical air supply inlet 6” (15cm) for appliances < 10,000
to building or the combustion air inlet to any Btuh (3kW), 12” (30cm) for
6” (15cm) for appliances
< 10,000 Btuh (3kW), 9”
other appliances
appliances > 10,000 Btuh (3kW) and <
100,000 Btuh (30kW), 36” (91cm)
for appliances > 100,000 Btuh (30kW)
(23cm) for appliances > 10,000
Btuh (3kW) and < 50,000 Btuh
(15kW), 12” (30cm) for
appliances > 50,000 Btuh (15kW)
K = Clearance to a mechanical air supply inlet
6’ (1.83m)
3’ (91cm) above if within 10’
(3m) horizontally
L = Clearance above paved sidewalk or paved 7’ (2.13m)†
driveway located on public property
7’ (2.13m)†
M = Clearance under veranda, porch, deck or
balcony
12” (30cm)‡
12” (30cm)‡
1 In accordance with the current CSA-B149 Installation Codes
2 In accordance with the current ANSI Z223.1/NFPA 54 National Fuel Gas Codes
† A vent shall not terminate directly above a sidewalk or paved driveway which is located between two (2) single family dwellings and
serves both dwellings
‡ only permitted if veranda, porch, deck or balcony is fully open on a minimum two (2) sides beneath the floor:
NOTE: 1. Local codes or regulations may require different clearances.
2. The special venting system used on Direct Vent appliances are certified as part of the appliance, with clearances tested and ap
proved by the listing agency.
4
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Majestic® Fireplaces Power Venting System
Horizontal Discharge
Vertical Discharge
Installation
1. Slip Sound Reducer into flue collar and press on to
fireplace top.
2. Fasten Sound Reducer to fireplace top with four (4)
sheet metal screws supplied.
3. Continue with the power venter installation as per
instructions supplied with same.
Oil Holes
4” (102 mm) Insu-
lated Flue Liner
Motor Shaft
Vertical
Sound Reducer
Sheet Metal
Screws
Fireplace Top
Incorrect
FP1419
Fig. 3 The Power Venter must be mounted with motor shaft
horizontal.
3. Power Venter housing in single wall a 6” (152 mm)
clearance must be maintained. (Fig. 4)
Fireplace
FP1417
Combustible Material
Fig. 1 Secure sound reducer to fireplace top with four (4)
sheet metal screws.
Installation Restrictions
Sound Reducer Kit SR6
Power Venter
1. Although the Power Venter can be installed any-
where in the exhaust system, it is best if it is installed
as close to the termination of the vent system as
possible to obtain optimal appliance efficiency and to
prevent flue gas leakage. (Fig. 2)
6" (152mm)
Minimum
NOTE: 6” (152mm)
maximum clearance from
combustible must be
maintained.
Vent Support Hangers
Spaced 36” (914mm) on
Horizontal Run
FP1420
Combustible Material
Fig. 4 Minimum clearance.
4. Allow for a minimum of 18” (457mm) vertical rise off
the top of the appliance before the vent makes a 90°
elbow to the horizontal. (Fig. 5)
Anti-Vibration Sleeve
5. Vent pipe transitions, where necessary, should be
gradually tapered. (Fig. 6)
FP1418
6. Power Venter to vent pipe connections and all joints
on the outlet side of the Power Venter must be
sealed with high temperature silicone sealant or alu-
minum vent pipe tape to prevent flue gas leakage.
(Fig. 7)
Fig. 2 It is best to install Power Venter as close to the termi-
nation as possible.
2. Power Venter must be mounted with motor shaft hor-
izontal to ensure proper operation of the fan proving
switch and to prevent motor bearing wear. (Fig. 3)
7. The vent terminal must not be more than 20’ (6m)
below the appliance’s flue outlet.
5
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Majestic® Fireplaces Power Venting System
4. Install optional sound reducer (Model SR5 or SR4)
onto fireplace. See Installation Instructions pack-
aged with sound reducer.
5. Mount Power Venter
NOTE: It is best to locate the fan near the vent
terminal. However, if such a location is not suitable,
the fan can be installed anywhere within the vent
system.
18” (457mm)
Minimum
a. Remove vibration isolation mount and retain
the nut from the parts bag and install. Install on
Power Venter as shown in diagram. Next install
flexible duct piece and outlet collar using four (4)
screws to fasten.
FP1421
Fig. 5 An 18” (457mm) minimum vertical rise is necessary
before a 90° elbow.
b. To prevent vibration, securely support Power
Venter from ceiling or joist with Power Venter
bracket. (Fig. 8)
c. By using 1” (25 mm) bracket, clearance to fan is
maintained at 1” (25 mm). The addition of the 6”
(152 mm) bracket, maintains a 6” (152 mm) clear-
ance to combustibles.
Incorrect
Correct
Vertical Mounting
FP1423
Fig. 6 Vent pipe transitions should be gradually tapered.
Ceiling
Power Venter
Bracket
Power Venter
6” (152 mm)
Bracket
Negative Pressure
Positive Pressure
1” (25 mm)
Bracket
Vibration
Isolation
Mounts
Discharge
All seams on the
positive side of
power venter to
be sealed with
high temperature
silicone sealant.
Fan
Power Venter
Discharge
FP1424
Horizontal Mounting
FP1422
Fig. 7 Vent pipe connections and all joints on the outlet side
of the power venter must be sealed with high temperature
sealant.
Wall or
Wall
Studs
Installation
1. Cut 6¹⁄₄” (159mm) diameter hole through outside wall
- see General Code Requirements for proper loca-
tion.
2. Install vent terminal. Fasten from outside with four
(4) screws and caulk around flange edge.
Fan
Power Venter Bracket
3. Locate fireplace and fasten to floor as shown in fire-
place manual.
FP1425
Fig. 8 Power venter mounting options.
6
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Majestic® Fireplaces Power Venting System
6. Measure distance between fireplace’s flue outlet (top
of Sound Reducer) and fan inlet. Cut flexible duct
and insulate with insulation sleeve sections using
noise cone for ease of mounting. Please note that
wherever possible use continuous length pipe with-
out joints.
Electrical Wiring
Electrical connections and grounding must be in ac-
cordance with the Canadian Electrical Code, C22.1 Part
1 and in U.S.A., National Electrical Code ANSI/NFPA70
and/or local codes where applicable.
7. Apply silicone at both ends, and attach flex pipe to
collars. Secure with clamps (provided). For addition-
al reinforcement, it is recommended that three (3)
sheet metal screws be used at each joint to prevent
pipe from accidentally separating.
Operation Sequence of 24 VAC
Controlled Appliance
When Power Vent Switch is activated, its closure
completes the 24 VAC electrical circuit from the ap-
pliance transformer through the switch to the Power
Venter relay. The 24 volts applied to the relay coil bring
in the 115 volt power to the motor. The air movement
generated by the Power Venter closes the Fan Proving
Switch contacts which allows the switch signal to reach
the 24 volt burner control. The Fan Proving Switch
actually becomes the burner controller and will allow
the appliance to operate only when the Power Venter is
operating.
8. If fan is located at vent terminal, connect it by first
sealing the joints with silicone. Again use three (3)
sheet metal screws for each joint.
9. Seal all joints with aluminum vent pipe tape and
cover with insulation. Joints between fan and vent
terminal must be absolutely air and water tight to
prevent flue gas or condensation leakage.
10. Support venting duct with plumber’s strap (supplied
by installer). On horizontal runs support vent pipe
every 36” (914mm) to prevent it from sagging.
WARNING: All 120 volt wiring must com-
ply with applicable codes and ordinances.
The optional power venter Model PVS-1 is
equipped with a plug-in cord and an elec-
tric knockout. When unit is wired directly
the cord must be removed.
11. Enclose venting system, if necessary leaving at
least 1” (25 mm) clearance between insulation and
combustible materials and 6” (152 mm) between fan
housing and combustibles.
Install 24 Volt wiring harness. Simply plug in connector
at fan electrical box, slide connectors onto gas valve
operator and connect to power switch or if applicable to
thermostat. Refer to Figure 9. Be sure to keep wires
away from heated areas, within the fireplace route wires
along gas line.
Black
To Fan*
White
L2
L1
115 / 1 / 60
Power
Venter
Motor
White
N/O Relay
Black
Black
G
115V
*If optional fan and/or power
venter is used, wire electrical
system as shown in diagram.
(Dotted Line) Wiring connec-
tions must be made within
junction box of power venter
and optional fan.
Transformer 20 VA
24V
Fan
Prover
Gas Valve
Thermostat
Blue
Yellow
Relay Coil
Orange
Blue
FP1426
Fig. 9 Typical wiring, 24 VAC control.
7
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Majestic® Fireplaces Power Venting System
b. Set Air-Flow Adjustment by loosening locknut and
turning rod handle. CAUTION: HANDLE MAY
BE HOT, use pliers to move handle. Position of
rod handle on outside of Power Venter housing
indicates position of Air-Flow Adjustment inside
housing.
Operation and Checking the Draft
1. Insofar as is practical, close all doors, windows and
air inlets to the building. Turn on all exhaust fans
(range hood, bathroom exhaust, etc.) so they will
operate at maximum speed.
2. Place appliance into operation. See fireplace
manual for gas start up information. Once pilot has
been lit and gas valve has been set open, activate
power switch, or where applicable, adjust thermostat
so the appliance will operate continuously. At this
point the fan will start up and once air flow has been
proven the main burner will start.
c. Using pliers, move handle towards minimum draft
setting until spillage is detected at relief opening,
then re-open Adjustment just enough to eliminate
spillage.
d. Lock Adjustment at desired setting by tightening
locknut.
e. Return doors, windows exhaust fans and fire-
place dampers to their previous condition of use.
3. After allowing appliance to operate for five (5) min-
utes, test for spillage at the draft hood relief opening
or at fireplace front opening.
f. Turn off appliances started in Step 4 above.
Checking the Draft. Allow the vent connected gas
utilization equipment to operate for several minutes.
Then check to see that the combustion products
are going up the chimney or gas vent properly, by
passing a lighted match or taper around the edge
of the relief opening of the draft hood. If the chim-
ney or gas vent is drawing properly, the smoke
from the match flame will be drawn into the draft
hood or opening. If smoke is not drawn in, then the
combustion products are escaping from the relief
opening into the room. Under these conditions, the
equipment must not be operated until proper adjust-
ments or repairs are made to provide adequate draft
through the chimney or gas vent.
Damper Closed
Damper Open
FP1427
Fig. 10 Adjustable damper control.
Maintenance
The Power Venters must be inspected semi-annually.
Points of inspection are:
4. Next, turn on all other fuel-burning appliances within
the same room so they will operate at their full input.
Repeat Step C above, checking the draft on each
appliance.
1. Motor - Motor must rotate freely. Oil every six
months of operation with four (4) drops of SAE 20
oil.
5. The Air-Flow Adjustment on the Power Venter is fac-
tory set for maximum air flow. Operating a properly
sized Power Venter at maximum setting will assure
that combustion gases are safely removed to the
outside. If the Power Venter has excess venting
capacity than what is required for this application,
operating the Power Venter with the Air-Flow Adjust-
ment at the maximum setting may draw more dilu-
tion air than necessary.
2. Wheel - Wheel must be clean of soot, ash or any
other coating which inhibits rotation or air flow. Re-
move all foreign material from vent system before
operation.
3. Pressure Switch - Pressure Switch must operate
freely. Verify proper operation by observing Opera-
tion Sequence at least every six months.
The Air-Flow Adjustment may be set by use of a
combustion analyzer, inclined manometer or draft
gauge. Alternatively, the Air-Flow adjustment can be
set using a smoke candle or taper, as follows:
a. With exhaust fans operating, air inlets closed and
all appliances firing (as instructed above), hold
lighted match or taper around the edge of the re-
lief opening of the draft hood or fireplace opening.
8
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Majestic® Fireplaces Power Venting System
Pressure Switch
Power Venter
Motor Leads
Heyco
Heyco
Adapter
Bushing
Green #4
Adapter
Bushing
White
Black
N/O Blue
Comm
Gas Valve
Blue #3
Red #2
Grn
Switch On
Off
White #1
Green/Yellow
Stripe
Motor
1/2"
Timer/Relay
Control
White/Red
Stripe
24
VAC
Black
Black
20VA Transformer
Yellow
5
4
White
Vibration Isolation
Field Installed
115
VAC
Optional
location for
vibration isolator
Yellow
Power Venter
Housing
Power Venter
Junction Box
CFM Corporation reserves the right to make changes in design, materials, specifications, prices and discontinue colors and products at any time,
without notice.
Power Venter Part List
Mounting Bracket 1”
Mounting Bracket 6”
Hose Clamp
50543
49552
51875
Motor Assembly, Power Vent
Switch, Wall
51867
51842
Vibration Insulator
Plate Wall Switch
50545
51843
Pressure Switch
52921
Timer Relay/Post Purge
Transformer 24 Volt
Sound Reducer (SR6)
52901
10001694
49770 (Fig. 1)
9
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Majestic® Fireplaces Power Venting System
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Majestic® Fireplaces Power Venting System
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CFM Corporation
2695 Meadowvale Blvd. • Mississauga, Ontario, Canada L5N 8A3
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