Table of Contents
Advertisement
F. Factory-Installed Convenience Outlet
The optional electrical outlet provides 115-v from the unit for
power driven tools and other equipment. Outlet provided with
a factory-installed fuse.
G. Factory-Installed Optional Varislide™ Economizer
The optional economizer hood assembly is packaged and shipped
in the filter section. Damper blades and control boards are
installed at the factory and the economizer is shipped in the
vertical discharge position.
NOTE: Horizontal discharge block-off plate is shipped with
the air hood package. If unit is to be used for vertical dis-
charge application, discard this plate.
Assembly
1. Determine if ventilation air is required in building. If
so, determine the minimum amount to be supplied by
each unit and record quantity of ventilation air needed
for use in Step 8.
2. Remove filter access panel by raising panel and swing-
ing panel outward. Panel is now disengaged from track
and can be removed. No tools are required to remove
filter access panel. Remove outdoor-air opening panel.
Save panels and screws. See Fig. 13. Remove optional
outdoor-air damper hood package from filter section.
3. Assemble outdoor-air hood top and side plates as shown
in Fig. 14. Install seal strips on hoop top and sides.
Put aside screen retainer and retainer screw for later
assembly. Do not attach hood to unit at this time.
4. Slide economizer into unit and secure with screws. See
Fig. 15.
NOTE: Be sure to engage rear economizer flange under tabs
in vertical return-air opening.
5. To convert to horizontal discharge application:
a. Rotate the economizer 90 degrees until the econo-
mizer motor faces the condenser section (see Fig. 16).
b. Rotate
the
barometric
90 degrees.
c. Install horizontal discharge block-off plate over the
opening on the access panel. (Block-off plate MUST
be installed before installing hood assembly.)
6. Insert economizer plug into economizer harness. Re-
move tape from barometric relief damper. See Fig. 15.
7. If ventilation air is not required, proceed to Step 9. If
ventilation air is required, determine the minimum po-
sition setting for required airflow. See Fig. 17. Adjust
minimum position setting by adjusting the screws on
the position setting bracket. Slide bracket until the top
screw is in the position determined by Fig. 17. Tighten
screws.
8. Remove tape from outdoor-air thermostat (OAT). Fas-
ten OAT inside of hood using screws and speed clips
provided. See Fig. 18. Make sure OAT terminals are
positioned up.
9. Replace outdoor-air opening panel using screws from
Step 2. Replace filter access panel. Ensure the filter
access panel slides along the tracks and is securely
engaged.
10. Fasten hood top and side plate assembly (Fig. 14) to
outdoor-air opening panel with screws provided.
11. Place knob supplied with economizer on OAT. See
Fig. 18. Set for 3° F below indoor room thermostat set-
ting. If accessory enthalpy control (EC) is used in place
of OAT, see instructions shipped with EC for installa-
tion and adjustment. See Fig. 18.
relief
damper
cover
—13—
12. Connect OAT per Fig. 19.
13. Slide outdoor-air inlet screen into screen track on hood
side plate. While holding screen in place, fasten screen
retainer to hood using screws provided.
NOTE: Refer to Fig. 20 for economizer barometric relief damper
characteristics.
H. Factory-Installed Optional PARABLADE Economizer
The optional PARABLADE economizer hood assembly is pack-
aged and shipped in the filter section. Damper blades and
control boards are installed at the factory and the econo-
mizer is shipped in the vertical discharge position.
NOTE: Horizontal discharge block-off plate is shipped with
the air hood package. The PARABLADE economizer can only
be used for vertical discharge applications. Discard this plate.
Assembly
1. Determine if ventilation air is required in building. If
so, determine the minimum amount to be supplied by
each unit and record quantity of ventilation air needed
for use in Step 6.
2. Remove filter access panel by raising panel and swing-
ing panel outward. Panel is now disengaged from track
and can be removed. No tools are required to remove
filter access panel. Remove outdoor-air opening panel.
Save panels and screws. Remove optional economizer
so the outdoor-air damper hood package can be re-
moved from the filter section.
3. Assemble outdoor-air hood top and side plates as shown
in Fig. 14. Install seal strips on hood top and sides.
Put aside screen retainer and retainer screw for later
assembly. Do not attach hood to unit at this time.
4. Slide economizer into unit and secure with screws. See
Fig. 21.
NOTE: Be sure to engage rear economizer flange under tabs
in vertical return-air opening.
5. Insert economizer plug into economizer harness. Re-
move tape from barometric relief damper. See Fig. 21.
6. If ventilation air is not required, proceed to Step 7. If
ventilation air is required, perform the following:
a. Make sure the factory-installed jumper is in place
across terminals P and P1 on the economizer logic
module. T and T1 should be disconnected during
adjustment.
b. The 2 potentiometers with slots for adjustment are
located on the face of the economizer logic module.
Turn the lower potentiometer fully clockwise. The
dampers should be fully closed. Turn the potentiom-
eter gradually counterclockwise until the desired po-
sition is reached.
Fig. 13 — Access Panel Locations
Advertisement
Table of Contents
