33
Large Chassis
To install the Vertical Economizer on the large chassis perform the
following procedure:
1. Turn off unit power supply and install lockout tag.
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
Before installing or servicing system, always turn off main
power to system and install lockout tag. There may be more
than one disconnect switch. Turn off accessory heater
power switch if applicable.
!
WARNING
2. Remove economizer hood top panel from the return side of
the unit. See Fig. 25. Keep screws and panel next to the
unit.
3. Remove red shipping tape that attaches the outside air
temperature (OAT) sensor to the economizer assembly and
place sensor next to the unit.
4. Remove horizontal return duct cover panel and cut the wire
ties that hold the hood divider to the economizer assembly.
Slide hood divider off from the two slots holding it in place
and place next to the unit. See Fig. 26.
5. Replace horizontal return duct cover panel. Screw in place
ensuring all seams are air and watertight.
6. Open economizer hood package found on the top skid.
Mount OAT sensor to its assigned bracket by screwing
together with provided two #8 fasteners. Afterwards install
OAT sensor to the right side hood panel with the provided
#10 screws. See Fig. 27.
7. Install the 2 angle filter brackets to the right and left hood
side panels respectively with the #10 screws provided. See
Fig. 28.
8. Assemble hood according to Fig. 29 screwing together
with provided #10 sheet metal screws.
9. Install assembled hood over the economizer opening in the
replacement return chamber panel. See Fig. 30. Screw in
place through pre-punched holes. Make sure all seams are
air and watertight.
NOTE
: The two wires that connect to the outside air temperature
sensor (OAT) should remain accessible.
10. Connect the outside air temperature sensor (OAT) to the
economizer per wiring diagram.
OAT Sensor
Filter Access
Panel
Hoop Top
Panel
A09696
Fig. 25 -- Economizer Hood Top Panel Removal
Horizontal
Return Duct
Cover Panel
Hood
Divider
Hood Divider
(Removed)
A09697
Fig. 26 -- Horizontal Return Duct Cover Panel and Hood Divider Removal
704D
--
--
A
Summary of Contents for Legacy 704D--A
Page 3: ...3 A09467 Fig 2 704D A24 36 Unit Dimensions 704D A...
Page 4: ...4 A09468 Fig 3 704D A42 60 Unit Dimensions 704D A...
Page 17: ...17 A10202C Fig 13 Connection Wiring Diagram 208 230 3 60 704D A...
Page 18: ...18 A10202L Fig 13 Cont Ladder Wiring Diagram 208 230 3 60 704D A...
Page 21: ...21 A08490 Fig 15 Cooling Charging Chart 704D A...
Page 41: ...41 A10201 Fig 41 Connection Wiring Diagram 230 3 704D A...
Page 42: ...42 A10201 Fig 41 Cont Ladder Wiring Diagram 230 3 704D A...
Page 43: ...43 A10203 Fig 42 Connection Wiring Diagram 460 3 704D A...
Page 44: ...44 A10203 Fig 42 Cont Ladder Wiring Diagram 460 3 704D A...
