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Fig. 20 — Filter Divider on CRECOMZR080A00 Hood
24. Install aluminum filter(s) in EconoMi$er X hood. Clips at top
of hood will hold filters in place. (See Fig. 21.)
Hood
Divider
Barometric
Airflow
Fig. 21 — Fully Assembled Hood
25. Install EconoMi$er X hood over economizer. Screw hood in
place through pre-punched holes. Reinstall the unit's filter
access door. (See Fig. 22.) Re-install the Indoor blower
access panel. (See Fig. 7.)
Filter Door
EconoMi$er X
Hood
Fig. 22 — Install EconoMi$er X Hood and Unit Filter
Access Door
Hood Filter
Divider
Hood Top
Filter Clip
Outside Air
Cleanable
Aluminum Filter
After powering unit controller, program the W7220 controller
per the instructions to follow. See "Programming the W7220
Controller" on page 19. for summarized controller set-up
instructions. After all settings have been made, re-install the
unit control box panel. (See Fig. 7.)
Economizer performance charts are shown in Fig. 23 and 24. See
base unit installation manual to make adjustments to meet building
ventilation requirements.
2500
2000
1500
1000
500
0
0
0.05
0.1
RETURN DUCT STATIC PRESSURE (in. wg)
Fig. 23 — Barometric Relief Flow Capacity
6000
5000
4000
3000
2000
1000
0
0
0.1
RETURN DUCT STATIC PRESSURE DROP (in. wg)
Fig. 24 — Return Air Pressure Drop
9
CRECOMZR076A00
CRECOMZR078A00
and
CRECOMZR080A00
0.15
0.2
0.25
0.3
CRECOMZR076A00
CRECOMZR078A00
CRECOMZR080A00
0.2
0.3
0.4
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