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Heat Anticipator Setting
The room thermostat heat anticipator must be properly ad-
justed to ensure proper heating performance. Set the heat
anticipator, using an ammeter to determine the exact re-
quired setting.
NOTE: For thermostat selection purposes, use .14 amp for
the approximate required setting. Set heat anticipator stage
1 and 2 at .14 amp.
Failure to make a proper heat anticipator adjustment may
result in improper operation, discomfort to the occupants of
the conditioned space, and inefficient energy utilization; how-
ever, the required setting may be changed slightly to provide
a greater degree of comfort for a particular installation.
F. Accessory Installation
At this time any required accessories should be installed on
the unit. Control wiring information is provided in the unit
wiring book. Refer to accessory Installation Instructions pro-
vided with accessory.
G. 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 7.
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. 16. Remove optional
outdoor-air damper hood package from filter section.
3. Assemble outdoor-air hood top and side plates as shown
in Fig. 17. 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. 18.
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. 19.).
b. Rotate the barometric relief damper cover 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 assem-
bly.) See Fig. 20.
6. Insert economizer plug into economizer harness. Re-
move tape from barometric relief damper. See Fig. 21.
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. 22. 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. 22. Tighten
screws.
Fig. 16 — Typical Access Panel Locations
Fig. 17 — Outdoor-Air Hood Details
ECONOMIZER
CONTROL BOARD
ECONOMIZER
PLUG
ECONOMIZER
MOTOR
TOP
SCREW
BAROMETRIC
RELIEF DAMPER
POSITION SETTING
BRACKET
ECONOMIZER
MOUNTING SCREWS
Fig. 18 — Varislide Economizer Installed in Unit
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