Plastic Drain Pans; Coil; Air Handler Control (Ahc); Discharge Sensor (Dat) - Lennox CBX40UHV Series Installation And Service Procedure

208 / 240 VOLT TRANSFORMER
PRIMARY
ORANGE
240 VOLTS
RED
208 VOLTS
BLACK
Figure 3 Transformer

Plastic Drain Pans

Both up-flow/down-flow and horizontal drain pans are
provided and installed on the CBX40UHV units. The drain
pans are made from fiberglass‐filled plastic. The drain hole
is used for right‐hand air discharge only, and must be
plugged when the unit is configured for left‐hand air
discharge. Each pan has a set of connections, one for a
primary drain and one for an auxiliary drain.
All CBX40UHV series units have dual slab coils arranged in
an "A" configuration. Each coil has two or three rows of
copper tubes fitted with ripple‐edge aluminum fins. A check
and expansion valve complete with inlet screen feeds
multiple parallel circuits through the coils. The coil is
designed to easily slide out of the unit cabinet.
SECONDARY
BLUE
YELLOW

Coil

Air Handler Control (AHC)

The Air Handler Control manages electric heat, indoor
blower and accessory controls. The Air Handler Control
also provides system
adjustments plus diagnostic capabilities.

Discharge Sensor (DAT)

The Air Handler Control has two screw terminals marked
Discharge Air Sensor. The sensor is REQUIRED for
®
EvenHeater operation and is field mounted and ordered
separately, use Lennox Catalog # 88K38.
In the EvenHeater mode, the discharge air sensor cycles
the electric heating elements as needed to maintain the Air
Handler control EvenHeater jumper selected discharge
setpoint.
The discharge air sensor should be mounted downstream
of the electric heat elements as illustrated in Figure 4, Detail
A. It must be placed in a location with unobstructed airflow,
where other accessories (such as humidifiers, UV lights,
etc.) will not interfere with its accuracy.
Wiring distance between the Air Handler Control and the
discharge air sensor should not exceed 10' (3m) when
wired with 18-gauge thermostat wire.
Outdoor Air Sensor (OAS)
These terminals are for FUTURE USE. (DO NOT USE).
Page 10
configuration and air-flow
CBX40UHV