Field Controls PVO-600 User Manual
Page 7
Page 7
M
ULTIPLE
A
PPLIANCE
S
YSTEMS
When using one PVO power venter to common vent more than one
appliance, a Control Kit is required for each additional appliance.
1. Connect the negative pressure port of each air pressure fan proving
switch on all Control Kits being used to the provided tee mounted on
the PVO. (See Figure 4)
2. Remove the cap from the branch of the tee and use the ferrule and
compression nut provided in the small envelope with the PVO to attach
the connecting tube.
3. Refer to the instruction sheet included with each Control Kit for specific
instructions for that kit, including wiring diagrams.
ADJUSTMENTS
A
IR
F
LOW
A
DJUSTMENT
NOTE: Before installing, refer to the General Installation Inspection to
check for negative pressure problems in the building.
1. To adjust the power venter air flow, open the choke plate ½ to ¾ of the
way open. (See Figure 5) Follow the appliance manufacturer’s
procedures for starting the heating appliance.
2. Adjust the thermostat to call for “Heat”. After the system has operated
for several minutes to stabilize flue gas temperatures, use a draft
gauge, velocity meter, or match test procedure to check for negative
draft or up-draft at the heating appliance outlet or air flow into the draft
hood.
3. Adjust the inlet choke damper on the power venter in or out to obtain
the minimum air flow required to maintain draft. Then increase air flow
slightly (10% over minimum air flow rate) to ensure proper venting.
For power burners, adjust draft to proper over-fired draft.
If using a barometric draft control, use the draft control to fine tune the
system draft.
4. If proper draft has been established, secure the choke plate by
tightening the screws on the inlet collar.
5. Shut off thermostat and check for residual heat spilling from the draft
hood or draft control. If this occurs, increase the post purge time on
the timer.
NOTE: After proper venting has been established, it is recommended
that a combustion test and a smoke test be performed to ensure
maximum burner efficiency. Oil burner air adjustments should be set at a
zero to a trace smoke at the highest or recommended CO
2
% setting set
by heating equipment manufacturer.
P
RESSURE
S
WITCH
A
DJUSTMENT
1. With the venter air flow set and the appliance operating at the best operating
efficiency, adjust the pressure switch by rotating the adjustment screw
clockwise until the burner shuts off.
2. Rotate the adjustment screw counterclockwise until the burner fires.
3. Rotate the adjustment screw an additional ¼ turn counterclockwise to insure
proper switch setting. (See Figure 6)
P
OST
P
URGE
T
IMER
A
DJUSTMENT
To adjust the post purge time, refer to Figures 7 & 8.
For timer that looks like Figure 7: Rotate the timer adjustment on the
timer clockwise to increase the operation time. To decrease the
operation time, rotate the timer adjustment counterclockwise.
For timer that looks like Figure 8: Rotate the timer adjustment on the
timer counterclockwise to increase the operation time. To decrease the
operation time, rotate the timer adjustment clockwise.
*Typical post purge time should be between 3 to 5 min.
Figure 6
Figure 5
Figure 4
Figure 8
Figure 7