Carnes SFPV Installation Manual

HOW IT WORKS

The SFPV is a thermally powered VAV diffuser which is completely self-contained and self-powered. The
mechanism is operated by four thermostatic actuators. The actuators provide VAV room temperature control
in heating and cooling. The simple design is based on fewer moving parts to hinder the actuator’s response.
A cone shaped diffusion damper creating less turbulence allows complete and even air distribution. The
diffusion damper has 1/8" foam padding for quiet operation. Room air is induced across actuators #3 and #4
by use of a simple induction wing. This diverts a small amount of supply air which induces a room air sample
through an induction trough located on the back side of the plaque panel.

Model SFPV

Thermally Powered VAV Diffuser

Installation, Operating & Maintenance Instructions

448 S. Main St., PO Box 930040 • Verona, WI 53593-0040 • Phone: [phone] • Fax: [phone] • Web: www.carnes.com

Induction Path
Diverts a small amount of supply air causing
the induction of a sample of room air to be
drawn up through the induction trough directly
across the room temperature control sensors.

Heating Slave

Warm-up Sensor

Induction Wing

VAV Heating Set Point Adjustment

Solid Center Panel
(Perforated Panel Optional)

Room Air Flow Inducer

Room Air Sample

Supply Air

EZ Temp Scale

VAV Cooling Set Point Adjustment

Disc (Flow Controller)

Form 12056
Issued 8-15-06

2

1

74°

74°

4

3

INSTALLATION

1. Inspect carton before opening. Notify shipper if external damage exists

2. Remove face panel protector.

3. Install in ceiling T-bar frame flat and down on the sides. Do not blow directly against surface mount light
fixtures or ceiling obstructions.

4. Connect and tape or zip tie the inlet duct to the collar for a leak proof connection. The collar O.D. is 1/8”
smaller than the normal duct size. Flexible duct should be formed in less than a 5 foot radius turn. A
horizontal inlet cap should be used where clearances prevent reasonable turns.

5. Four earthquake hangers are provided and should be used where applicable.

Relief Inlet Connection: Relief inlet connections may be added to all
diffusers if excessive duct pressue occurs when the diffusion damper
is in the closed or near closed position. Place relief collar with 2 legs
on the outside of the diffuser collar and install screws. A slight induction
effect may exist at full open. As the disc closes, the excess air will be
discharged through the opening between the duct connection and the
outlet ring.

Caution: Do not obstruct the relief area with duct.

Face Panel Removal

The solid face panel is held in place by four spring clips. To remove the face panel for room temperature
adjustments, approach panel from the induction trough side (the rectangle opening) reach above the panel on
both sides with your forefingers until you are able to place your forefingers behind the spring clips. Using your
thumbs on the front edge of the panel push the panel back or away from you while pulling the spring clip
spring clips forward or toward you with your forefingers. Lower the panel and pull forward to disconnect the
panel from the rear spring clips. When reattaching face panel the induction trough must be positioned directly
opposite of induction wing.

Temperature Adjustment

Cooling Adjustment

Diffusers feature an easy to read room temperature set-point scale.
Room temperature adjustments are made by simply turning the VAV
room temperature control thermostatic actuator #4 clockwise for a cooler
room temperature and counter clockwise for a warmer room temperature.
Determine room temperature set-point by aligning the end of the actuator
with the indicators on the temperature scale. Each full rotation or each
indicator on the temperature scale will equal plus or minus two degrees.
For factory set-point of 74 degrees, turn actuator clockwise to stop, then
turn counter clockwise three full turns.