Lennox CB29M-21, Unit Information

Page: 31 / 44

Page 31
F–Condensate Drain
A 5” (127mm) section of PVC pipe is provided with the
unit. Cut the pipe in half and use to route the auxiliary and
main drains. Connect main condensate drain and route
downward to an open drain or sump. Do not connect
drain to a closed waste system. Refer to figure 21 for
typical condensate trap configuration.
++
++
/!. +201 "% $%%. %,-2'( 1- -&&0%1 +!3)+2+ 01!1)#
$)&&%/%,#% %,%/!**4 ),#(%0 ++ +),)+2+
It is recommended that the auxiliary drain be con-
nected to a drain line for all units. If auxiliary drain is
not connected, it must be plugged with provided cap.
For downflow units, the auxiliary drain MUST be
connected and routed to a drain.
See figure 22 for
auxiliary and main drain locations.
FIGURE 22
LEFT–HAND
DISCHARGE
MAIN DRAIN ON RIGHT AUXILIARY DRAIN ON LEFT
UPFLOW OR
DOWNFLOW
RIGHT–HAND
DISCHARGE
The following practices are recommended to ensure
condensate removal:
1– Drain piping should not be smaller than the drain
connections at drain pan.
2– A trap must be installed in the main drain line.
3– The trap must be deep enough to offset the difference
in static pressure between drain pan and atmosphere.
Generally, two inches is satisfactory for medium static
applications.
4– Horizontal runs must be sloped 1” (25mm) per 10
feet (3.1m) of drain line to offset friction.
5– An open vent in drain line will sometimes be required
due to line length, friction and static pressure.
6– Drains should be constructed in a manner to facilitate
future cleaning and not to interfere with filter access.
See figure 21.
7– Auxiliary drain should run to an area where home-
owner will notice it draining. Refer to local codes.
V–START-UP – OPERATION
A–Preliminary and Seasonal Checks
1– Make sure the unit is installed in accordance with the
installation instructions.
2– Inspect electrical wiring, both field and factory
installed for loose connections. Tighten as required.
3– Check voltage at disconnect switch. Voltage must be
within range listed on the nameplate. If not, consult
the power company and have voltage condition
corrected before starting unit.
4– Check to ensure that refrigerant lines are in good
condition and pipe insulation is intact.
5– Inspect condition of condensate drain pan and piping
assembly. Disassemble and clean seasonally.
B–Cooling Start-Up
NOTE–The following is a generalized procedure
and does not apply to all thermostat control systems.
Electronic thermostat control systems may operate
differently.
1– Set fan switch to AUTO or ON and move the system
selection switch to COOL. Adjust the thermostat to a
setting far enough below room temperature to bring
on the compressor. Compressor will start and cycle
on demand from the thermostat.
2– The refrigerant circuit is charged with R–22 refrig-
erant. See condensing unit rating plate for correct
charge amount.
3– Refer to the correct condensing unit service manual
for more information.
C–Heating Start-Up
1– Set the fan switch to AUTO or ON and move the
system selection switch to HEAT. Adjust the ther-
mostat setting above room temperature.
2– The indoor blower immediately starts and the electric
heat will stage on based on sequencer timing.
D–Safety or Emergency Shutdown
Turn off unit power at circuit breaker.
E–Extended Period Shutdown
Turn off thermostat or set to “UNOCCUPIED” mode.
Turn off power to unit. All access panels and covers
must be in place and secured.
The condensate assembly should be clean and dry for
extended period shutdown.