Optional Electric Heat - Lennox CBX25UHV Series Installation And Service Procedure

2. Set the meter to the lowest ohms scale.
If the readings are all less than 20 ohms and within +/­ 10%
of each other, the motor passes this test. If not, the motor
has failed and must be replaced.
Figure 11. Testing Motor Windings (Winding to
Winding)
D-Coil
CBX25UHV units have dual slab coils arranged in an A
configuration. Each coil has two or three rows of copper
tubes fitted with ripple-edged aluminum fins. An expansion
valve, feeds multiple parallel circuits through the coils. The coil
is designed to easily slide out of the unit cabinet.
E-Drain Pans
Drain pans are provided and installed on the CBX25UHV.
Upflow Applications
NOTE - If the unit is installed in the upflow position, the
horizontal drain pan must be removed to ensure best air
flow and efficiency.
HORIZONTAL DRAIN PAN
IMPORTANT - REMOVE PAN
FOR BEST EFFICIENCY
AND AIR FLOW.
UPFLOW
DRAIN PAN
UPFLOW DRAIN
CONNECTIONS (BOTH
SIDES; USE ONE SIDE
OR OTHER)
Figure 12. Upflow Configuration
Horizontal Applications
NOTE - The unit is shipped with the horizontal drain pan
positioned for left-hand air discharge. The drain pan and
blow-off prevention bracket (-030 and larger units only)
must be removed and repositioned for use in right-hand air
discharge applications.
NOTE - When the unit is installed in horizontal applications,
a secondary drain pan is recommended. Refer to local
codes.
Units installed in a horizontal position must be sloped
slightly downward toward the drain connections to
ensure good drainage.
III-OPTIONAL ECB25 ELECTRIC HEAT
Optional
field-installed electric heat for air handler units.
Table 11 shows the available heat sections. Refer to the
Product Specifications for heat section applications.
Description
2.5 KW with stripped wires
5 KW with terminal block
5 KW with 30-amp circuit breaker
7.5 KW with terminal block
HORIZONTAL DRAIN
7.5 KW with 45-amp circuit breaker
CONNECTIONS
10 KW with terminal block
(BOTH SIDES; NOT
USED)
10 KW with 60-amp circuit breaker
12.5 KW with 25- and 50-amp circuit breakers
15 KW with 30- and 60-amp circuit breakers
20 KW with two (2) 60-amp circuit breakers
A-Heat Section Installation
Disconnect all power to the unit before servicing and
installing this equipment. Use proper tools and protective
equipment during installation and service.
Page 13
HORIZONTAL LEFT-HAND
AIR DISCHARGE
(FACTORY DEFAULT)
HORIZONTAL RIGHT-HAND
AIR DISCHARGE
NOTE - BLOW-OFF PREVENTION BRACKET. IS NOT REQUIRED ON 1.5-
AND 2-TON (-018 AND -024) UNITS.
Figure 13. Horizontal Left-Hand Air Discharge
ECB25 electric
Table 11. Electric Heat Sections
BLOW-OFF PREVENTION
BRACKET.
BLOW-OFF PREVENTION
BRACKET.(ROTATED AND
RE-SECURED)
heat sections provide
Catalog Number
89W42
89W43
89W44
89W45
89W46
10Z43
10T37
89W49
10T14
10T35