5. Secure all ducts to building structure. Flash, weatherproof, and
vibration-isolate duct openings in wall or roof according to
good construction practices.
CONVERTING
HORIZONTAL
DISCHARGE
UNITS
TO
DOWNFLOW (VERTICAL) DISCHARGE UNITS
Before performing service or maintenance operations on
system, turn off main power to unit. Turn off accessory heater
power switch if applicable. Electrical shock could cause
serious injury or death.
1. Open all electrical disconnects before starting any service
work.
2. Remove horizontal duct covers to access bottom return and
supply knock out panels.
3. Use a screwdriver and hammer to remove the panels in the
bottom of the unit base.
NOTE:
These panels are held in place with tabs similar to an
electrical knockout.
4. Reinstall the horizontal duct covers (Fig. 11) to block off the
horizontal air openings.
NOTE:
Avoid abrupt duct size increases and reductions. Abrupt
change in duct size adversely affects air performance.
Step 6—Provide for Condensate Disposal
NOTE:
Ensure that condensate-water disposal methods comply
with local codes, restrictions, and practices.
The 50XZ units dispose of condensate through a 3/4 in. NPT
female fitting that exits on the compressor end of the unit.
Condensate water can be drained directly onto the roof in rooftop
installations (where permitted) or onto a gravel apron in ground
level installations. Install a field-supplied condensate trap at end of
condensate connection to ensure proper drainage. Make sure that
the outlet of the trap is at least 1 in. lower than the drain-pan
condensate connection to prevent the pan from overflowing. Prime
the trap with water. When using a gravel apron, make sure it slopes
away from the unit.
Fig. 6—Unit Leveling Tolerances
C99065
A
B
C
MAXIMUM ALLOWABLE
DIFFERENCE (in.)
A-B
B-C
A-C
1/4
1/4
1/4
Fig. 7—Slab Mounting Detail
C99096
OPTIONAL
RETURN
AIR
OPENING
OPTIONAL
SUPPLY
AIR
OPENING
EVAP. COIL
COND. COIL
2"
Fig. 8—Threading Belt
C99067
HANDHOLD
FEED
HOOK
7
