Configuration Modification - Lennox CBX25UH Series Installation And Service Procedure

CIRCUIT BREAKER COVER INSTALLATION
1. Remove any installed patch plates still present .
2. Remove paper covering adhesive back around
backside perimeter of circuit breaker cover (figure 13).
3. Position the breaker cover over the air handler circuit
breaker opening (figure 14).
CIRCUIT BREAKER COVER
(BACKSIDE)
REMOVE PAPER COVERING
STICK BACK
Figure 13. Remove Paper Cover
IMPORTANT
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 14. Typical Circuit Breaker Cover Installation
AIR HANDLER SPEED CONNECTIONS
When using the electric heat sections with air handler units,
you must adjust the air handler speed according to the size of
electric heat and air handler unit. Air handler speed tap for
electric heat in upflow and horizontal position is medium.
For downflow it is high speed. See specific air handler
installation instructions for air handler speed adjustment
procedure and location.
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 air handler scroll,
aligned with circuit breaker unit wiring diagram sticker.

Configuration Modification

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 as required 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 will allow 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 15. Upflow Configuration
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HORIZONTAL DRAIN
CONNECTIONS
(BOTH SIDES; NOT
USED)