York Sunline 2000 Installation Instruction Download

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OPTIONAL ECONOMIZER RAIN HOOD

The following procedure should be used when assembling an
economizer rain hood onto a unit. Refer to Figure 3. The
outdoor and return air dampers, damper actuator, the linkage
and all the controls are factory mounted as part of the
economizer option.

All of the hood components, including the filters, the gasketing
and the hardware for assembling are located above the top filter
racks within the filter section. The outdoor air sensor is in the
bag of parts located at the bottom of the return air section.

1. With filter section access panel removed, take out hood

components, filters and sensor described above. Remove
and discard outdoor air opening cover on back unit (Upper
right hand corner).

2. Remove the 1/2" knockout (A) in the units rear panel

(located to the right side of the outdoor air opening). Insert
the two loose wires from inside the unit, into the 1/2"
bushing provided. Insert wires and bushing into knockout.
Snap bushing into place.

3. Mount the outdoor air sensor to the rear panel, just below

the knockout described in Step 2. Secure with two
self-drilling screws at dimples (B) provided in the panel.

NOTE: Sensor must be positioned so that the sensing

ports are at the top (louvers pointing downward)
and terminal connections to the right.

4. Connect the two wires, indicated in Step 2, to the sensor

as follows:

•

Wire #73 to terminal (+)

•

Wire #74 to terminal (S)

5. Assemble the LH and RH side plates to the top cover

(2 screws each side) to form the hood. Apply gasketing to
the flange surface on each side plate. Extend gasketing
1/4" beyond top and bottom of each flange to insure ade-
quate corner sealing. Secure this assembly to the unit back
panel (upper right hand corner). First, remove screw (C) on

unit top cover. Then slip flange of hood cover in under flange
of unit top cover, replace screw (C), engaging hole (E) in
hood flange and tighten. Attach the two side plates to the
unit panel by using two self-drilling screws for each side
plate at dimples (D) provided in the panel.

6. Position fillpiece at bottom of hood, between the two side

plates but do not secure at this time. (Slotted openings
MUST be downward for drainage). After fillpiece is properly
positioned, note where contact is made with the unit panel.
Remove fillpiece and apply gasket material to this area to
provide a seal. Reposition fillpiece and secure with 2
screws.

7. Install the two filters into the hood assembly, sliding down

along retainers on side plates, into fillpiece at bottom of
hood.

NOTE: Install filters so that “Air Flow” arrows point toward

the unit.

8. Install filter cover over the end of the hood with one screw

(center of hood), securing filters into position.

CAUTION: When proceeding with steps 9 and 10, extreme

care must be exercised while turning both the set
point and minimum position adjusting screws to
prevent twisting them off.

9. The enthalpy set point for the dampers may now be set by

selecting the desired set-point from graph in Figure 6. For
a single enthalpy economizer, carefully turn the set-point
adjusting screw to the “A”, “B”, “C” or “D” setting
corresponding to the lettered curve. For a dual enthalpy
economizer, carefully turn the set-point adjusting screw
fully clockwise past the “D” setting.

10. To check that the damper blades move smoothly without

binding, carefully turn the minimum position adjusting
screw fully clockwise and then energize and de-energize
terminals “R” to “G”. With terminals “R” to “G” energized,
turn the minimum position screw counterclockwise until the
desired minimum position has been attained.

11. Replace the filter section access panel.

GASKET

HOOD
COVER

OUTDOOR AIR
SENSOR

FILTER SECTION
ACCESS PANEL

GASKETED
FLANGE

R. H.
SIDE
PLATE

GASKETED
FLANGE

FILTER
COVER

L. H. SIDE
PLATE

FILTERS

FILLPIECE