Configuration Modification - Lennox CBX25UHV Series Installation And Service Procedure

WARNING
Confirm air tight seal between breaker cover and air
handler access panel. Apply a thin silicone bead to the
adhesive back seat to ensure air tight seal.
Failure to seal circuit breaker cover will allow warm moist
air to be pulled into control panel which can create
condensation to form on the circuit breaker and other
electrical components within the control panel.
Figure 21. Typical Circuit Breaker Cover Installation
E-Air Handler Speed Connections
When using the electric heat sections with air handler units,
adjust the air handler speed according to the size of electric
heat and air handler unit. See air flow chart section for speed
adjustment procedures.
1. Set the thermostat above room temperature.
2. Check the heat pump and the heat section for normal
operation.
3. Set the thermostat to desired setting.
4. Affix the wiring diagram sticker to front access door
next to the unit wiring diagram.
IV-CONFIGURATION MODIFICATIONS
A-Upflow Application
1. The air handler must be supported on the bottom only
and set on solid floor or field‐supplied support frame.
Securely attach the air handler to the floor or support
frame.
2. If installing a unit in an upflow application, remove the
horizontal drain pan.
IMPORTANT - The horizontal drain pan
is not required in upflow air discharge installations; its removal
provides the best efficiency and air flow.
3. Place the unit in the desired location and slope unit as
previously mentioned. Connect return and supply air
plenums using sheet metal screws.
4. Install units that have no return air plenum on a stand
that is at least 14" from the floor. This allows for proper
air return.
HORIZONTAL DRAIN PAN
IMPORTANT! REMOVE PAN
FOR BEST EFFICIENCY
AND AIR FLOW.
UPFLOW
DRAIN PAN
UPFLOW DRAIN CON­
NECTIONS (BOTH
SIDES; USE ONE SIDE
OR OTHER)
Figure 22. Upflow Configuration
B-Horizontal Application
WARNING
When removing the coil, there is possible danger of
equipment damage and personal injury. Be careful when
removing the coil assembly from a unit installed in right-
or left-hand applications. The coil may tip into the drain
pan once it is clear of the cabinet. Support the coil when
removing it.
ANGLE IRON OR SHEET METAL
MAXIMUM 1/2" LONG
SCREW
FRONT VIEW
Figure 23. Suspending Horizontal Unit
NOTE — When the unit is installed in horizontal
applications, a secondary drain pan is recommended.
Refer to local codes.
NOTE — This unit may be installed in left-hand or
right-hand air discharge horizontal applications. Adequate
support must be provided to ensure cabinet integrity.
Ensure that there is adequate room to remove service and
access panels if installing in the horizontal position.
LEFT-HAND DISCHARGE
1. Determine knockouts
connections.
2. With access door removed, knock out drain line
opening for installing drain lines.
Page 17
HORIZONTAL DRAIN
CONNECTIONS
(BOTH SIDES; NOT
USED)
ELECTRICAL INLET CLEARANCE
4 IN. (102 MM)
AIR FLOW
END VIEW
required for drain line