CACG/CAHG/CAHJ & CACH/CAHH/CAHK
Air Handlers
• Installation, Operation and Maintenance Manual •
Comfort where it counts
30
P/N 240008108, Rev. G [07/08/10]
Verify heat pump operation (no
electric heat)
This arrangement uses a heat pump
1.
outdoor unit with no heat source in the
cassett e (indoor) unit.
Th
e confi guration (
2.
Figure 36, Page 35 )
should be set for Heat Source OFF, Heat
Pump ON.
Use the remote to set MODE to Cool (see
3.
Figure 35, Page 34 ).
Use the remote to adjust setpoint tem-
4.
perature below the room temperature (at
the cassett e unit).
Th
e compressor should come on. Verify
5.
that supply air is cooler than room air.
Use the remote to adjust setpoint tem-
6.
perature above the room temperature (at
the cassett e unit).
Verify that supply air is warmer than
7.
room air.
Verify heat pump operation (with
electric heat option)
Th
is arrangement uses a heat pump out-
1.
door unit with the optional electric heat
source in the cassett e (indoor) unit.
Th
e confi guration (
2.
Figure 36, Page 35 )
should be set for Heat Source ON, Heat
Pump ON.
Use the remote to set MODE to Cool (see
3.
Figure 35, Page 34 ).
Use the remote to adjust setpoint tem-
4.
perature below the room temperature (at
the cassett e unit).
Th
e compressor should come on. Verify
5.
that supply air is cooler than room air.
Use the remote to adjust setpoint temper-
6.
ature 1°F above the room temperature (at
the cassett e unit), or just enough needed
to activate fi rst stage heating.
Th
e compressor should come on.
7.
Verify that supply air is warmer than
8.
room air.
Increase the setpoint until the second
9.
stage heating (electric heaters) activates.
Verify operation.
10.
Check condensate pump
operation
Remove an adjacent ceiling tile to access
1.
the condensate pump cover panel.
Insert a squeeze water bottle nozzle
2.
through the opening in the condensate
pump access panel and fi ll drain pan. See
Figure 32, Page 30 .
Adding water will activate the fl oat switch
3.
and the pump. Water must fl ow regularly
with condensate pump energized. If water
does not, check the pipe slope or see if
there are any pipe restrictions.
Ensure that all covers, panels and fi lters
4.
are in place and discharge louvers are
correctly positioned.
Checking condensate pump
Figure 32
operation
NOTICE
Th
e unit is equipped with a safety switch
that will activate the pump when the
condensate reaches a critical level. Th
e
safety switch will also de-energize the
compressor if the water level becomes
too high.
Additional cassette units
Repeat the start-up procedure for all cas-
1.
sett e units in the system.