Specification

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Venting
Improves Gas Boiler Efficiency.
Keeps Cold Air Out, Warm Air In.
All dimensions are in inches and are approximate. Specifications subject to
change. For the most current specifications, contact Field Controls.
Wiring diagram for a typical standing pilot hookup when wiring
harness is not provided.
How the GVD Works
The Field Vent Damper is installed in the vent pipe, after the draft hood, or barometric.
During off cycles, it remains closed, preventing air flow through the vent. When there
is a call for heat, the motor is energized, rotating the damper 90 degrees to an open
position. Opening and closing takes approximately 15 seconds. When the damper is
fully open, the burner is allowed to fire and flue gases pass freely through the vent.
When the thermostat is satisfied, the burner stops, and the damper automatically closes.
For service and trouble shooting, the damper can be locked in the open position.
Electrical Specifications
Minimum wiring
requirements:
• 24 VAC
• 18 gauge
• 105ºC
The Field Vent Damper works automatically to allow natural draft during appliance
operation while preventing residual appliance heat and conditioned air from escaping
during off cycles. It also prevents the infiltration of cold air during down drafts. It’s made
of stainless steel and is available in 8 sizes, 4" through 10" and 12".
Safety Features
Dual safety switches allow the burner to fire only when the damper is in the open position.
This unit will not interfere with existing appliance safety controls, when properly installed.
Operational Features
• Operates with all 24 VAC, 60hz intermittent ignition and standing pilot ignition systems.
• Stainless steel construction provides superior corrosion resistance.
• Damper operation: power opens in 15 seconds, power closes in 15 seconds. Power is off at damper motor
when it is at rest.
• Hold open switch allows damper to be placed in an open position and taken out of service to assist with
trouble shooting appliance problems.
• Keyed wiring harness connector plug installs only one way, preventing incorrect wiring connection.
Dimensions (inches)
Model
Pipe Size Length Height Clearance Exposed Pipe
A B C D E
GVD-4PL
4 6
1
⁄16 8
7
⁄8
15
⁄16 4
13
⁄16
GVD-5PL
5 6
1
⁄16 9
7
⁄8
15
⁄16 4
13
⁄16
GVD-6PL
6 6
1
⁄2 10
7
⁄8 1
3
⁄16 5
1
⁄4
GVD-7PL
7 7
1
⁄16 11
7
⁄8 1
7
⁄16 5
13
⁄16
GVD-8PL
8 8
1
⁄16 12
7
⁄8 1
15
⁄16 6
13
⁄16
GVD-9PL
9 10
1
⁄8 13
7
⁄8 3 8
7
⁄8
GVD-10PL
10 12
1
⁄8 14
7
⁄8 4 10
7
⁄8
GVD-12PL
12 12
1
⁄8 16
7
⁄8 4 10
7
⁄8
Typical Standing Pilot Hookup Without a Redundant Gas Valve
Boiler
L.W.C.O.
if used
Vent
Damper
Plug
4 BLK
3 YLW
2 ORG
W
C
R
N
H
R
1 BRN
Low Voltage
Limit Control
Room
Thermostat
24V
Transformer
120 Vac
Blocked Ve nt Switch
Flame Roll Out Switch
*DO NOT install plug in
damper blade on
standing pilot appliances
Field Wiring
Original Wiring
OriginalAdded
Gas Valve
TR TH TH TR
Gas Valve
If the original gas valve is a Redundant Gas Valve
where applicable
the added gas valve is not necessary.
Motor Assembly
Wiring harnesses are sold separately.
See replacement parts section.
5 3/4
A
E
B
C
D
GVD Series Vent Damper
Power requirements:
• 3 watts at 24 VAC
• 60 Hz when
opening or
closing