High Altitude Derate; Factory-Installed Options - Lennox LCH036 Installation Instructions Manual

High Altitude Derate

Locate the high altitude conversion sticker in the unit
literature bag. Fill out the conversion sticker and affix next
to the unit nameplate.
Refer to table 2 for high altitude adjustments.
TABLE 2
HIGH ALTITUDE DERATE
Altitude Ft.*
2000-4500
4500 And Above Derate 2% / 1000 Ft. Above Sea Level
*Units installed at 0-2000 feet do not need to be modified.
NOTE ‐ This is the only permissible derate for these units.

Factory-Installed Options

A-Economizer
The Unit Controller A55 controls economizer operation
and provides potentiometers to control minimum damper
position and enthalpy control adjustments. See the
economizer control settings section.
B-Intake Hood
Outdoor air hood is shipped folded down over the
horizontal supply air opening. The intake hood filters and
support brackets are shipped unassembled in the blower
compartment. Install as follows:
1- Remove left side from hood top panel. See figure 7.
REMOVE LEFT SIDE OF HOOD FROM UNIT
LEFT
SIDE
LONGER
FRONT
BRACKET
FIGURE 7
2- Remove and retain screws securing hood to unit.
3- Lift (rotate) the bottom of the hood top panel and
attach left side to hood top panel. See figure 8.
4- Secure sides of hood to unit mullions with retained
screws.
5- Caulk hinge opening on each end of air hood.
Gas Manifold Pressure
See Unit Nameplate
HOOD TOP
PANEL
SHORTER
FRONT
BRACKET
6- Install back filter bracket on unit division panel as
shown in figure 9.
OUTDOOR AIR HOOD
LEFT
SIDE
Detail A
BACK FILTER
BRACKET
UNIT
DIVISION
PANEL
7- Secure side seals to the hood sides as shown in
figure 10.
8- Install longer front filter bracket on hood top as shown
in figures 7 and 9. Insert four filters.
9- Slide fifth filter into back filter bracket and hold in
place at the top of the opening with the shorter front
bracket. Align holes on hood with bracket holes and
secure filter bracket with sheet metal screws.
Page 7
See Detail A
HOOD TOP
PANEL
LIFT
CAULK
BOTH ENDS
FIGURE 8
HOOD SIDE VIEW
HOOD TOP
HOOD SIDE
FILTERS
FRONT FILTER
BRACKETS (2)
FIGURE 9