Model Number Information; Blower Data - Lennox CBX25UH Series Installation And Service Procedure

Model Number Identification
CB - Air Handler
Refrigerant Type
UH = Up-Flow / Horizontal

Blower Data

The cooling blower speed is factory configured to provide
correct airflow for an outdoor unit that matches the cooling
capacity rating of the air handler.
CHANGE BLOWER SPEED
If the outdoor unit is smaller than the maximum cooling
capacity rating for the air handler, the cooling blower speed
may need to be changed. Refer to blower performance
chart, table 1 on page 5. Use figure 1 on page 4 as a
illustrated guide to the following procedure:
1. Disconnect all power supplies.
2. Remove the air handler access panel.
3. A blower relay harness is used to connect blower relay
terminals 2 and 5. The third connector is mated to the
BLUE (MED) wire.
4. Disconnect the BLUE (MED) wire connection.
BLOWER RELAY
NOTE — Refer to wiring diagram located on the unit access panel (or figure 1 above) and blower performance (table 1).
S
All air data measured external to unit with 1 inch non-pleated air filter in place.
S
All factory settings are medium speed except the -48 which is set to low speed from the factory.
S
All data given while air handler is operating with a dry DX coil.
CB X 25 UH − 030 − 230 − 10
Unit Type
X = HFC-410A
Series
Configuration
5
BLOWER RELAY
HARNESS
BLUE (MED)
2
4-PIN
BLOWER CONNECTOR
Figure 1. Changing Blower Speed
Voltage
230 = 208/230V-1 phase-60hz
Nominal Cooling Capacity
018 = 1.5 tons
024 = 2 tons
030 = 2.5 tons
036 = 3 tons
042 = 3.5 tons
048 = 4 tons
060 = 5 tons
5. Determine the required blower speed and connect
either the blower lead RED (LO) or BLACK (HI) to
the blower relay harness.
NOTE — Reuse the factory-installed plastic cap on the
connector that is not used.
6. Replace all panels.
7. Reconnect power.
CAUTION
Electrostatic discharge can affect electronic compo­
nents. Take precautions during unit installation and
service to protect the unit's electronic controls. Pre­
cautions will help to avoid control exposure to electro­
static discharge by putting the unit, the control and
the technician at the same electrostatic potential.
Neutralize electrostatic charge by touching hand and
all tools on an unpainted unit surface before perform­
ing any service procedure.
PLASTIC CAPS
RED (L0)
BLACK (HI)
YELLOW (COM)
Page 4
Minor Revision Number