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2. Set the meter to the lowest ohms scale.
If the readings are all less than 20 ohms and / 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)
HORIZONTAL DRAIN
CONNECTIONS
(BOTH SIDES; NOT
USED)
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.
BLOW-OFF PREVENTION
BRACKET.
HORIZONTAL LEFT-HAND
AIR DISCHARGE
(FACTORY DEFAULT)
BLOW-OFF PREVENTION
BRACKET.(ROTATED AND
RE-SECURED)
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
III-OPTIONAL ECB25 ELECTRIC HEAT
Optional ECB25 electric heat sections provide
field-installed electric heat for air handler units.
Table 11 shows the available heat sections. Refer to the
Product Specifications for heat section applications.
Table 11. Electric Heat Sections
Description
Catalog Number
2.5 KW with stripped wires
89W42
5 KW with terminal block
89W43
5 KW with 30-amp circuit breaker
89W44
7.5 KW with terminal block
89W45
7.5 KW with 45-amp circuit breaker
89W46
10 KW with terminal block
10Z43
10 KW with 60-amp circuit breaker
10T37
12.5 KW with 25- and 50-amp circuit breakers
89W49
15 KW with 30- and 60-amp circuit breakers
10T14
20 KW with two (2) 60-amp circuit breakers
10T35
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.
