Table of Contents
Advertisement
10 - Flip access door and replace it on the unit.
11 - Set unit so that it is sloped toward the drain pan end
of the unit. See sloping section figure 17. Connect
return and supply air plenums as required using
sheet metal screws.
12 - If suspending the unit, it must be supported along the
entire length of the cabinet. If using chain or strap,
use a piece of angle iron or sheet metal attached to
the unit (either above or below) so that the full length
of the cabinet is supported. Use securing screws no
longer than 1/2ʺ to avoid damage to coil or filter, as
illustrated in figure 12. Connect return and supply
air plenums as required using sheet metal screws.
RIGHT-HAND DISCHARGE
1 - Determine which plugs are required for drain line
connections.
2 - With access door removed, remove drain line plugs
to install drain lines.
3 - Set unit so that it is sloped toward the upflow drain
pan end of the unit and level from front to back of
unit (see figure 15).
4 - The horizontal configuration is shown in figure 15.
Drains
RIGHT HAND DRAINS
FIGURE 15. Right-Hand Discharge Configuration
5 - If the unit is suspended, the entire length of the
cabinet must be supported. If you use a chain or
strap, use a piece of angle iron or sheet metal
attached to the unit (either above or below) to
support the length of the cabinet. Use securing
screws no longer than 1/2 inch to avoid damaging
the coil or filter. See figure 12. Use sheet metal
screws to connect the return and supply air plenums
as required.
DOWNFLOW APPLICATION
NOTE – If downflow application is required, separately or-
der kit number Y9658 (-024 through -030) or Y9659 (-036
through -042) .Use the installation instruction 507797-01
provided with the downflow kit. Also use metal or class I
supply and return air plenums. Figure 16 shows proper
orientation.
AIR FLOW
PLUGS
If electric heat section with circuit breakers (ECBA25) is
installed in a CBA25UHE unit in a downflow application,
the circuit breakers must be rotated 180° to the UP
position. See ECBA25 installation instructions for more
details.
UPFLOW /
DOWNFLOW
DRAIN PAN
FIGURE 16. Downflow Discharge Position
Brazing Connections
Polyol ester (POE) oils used with HFC-410A refrigerant
absorb moisture very quickly. It is very important that the
refrigerant system be kept closed as much as possible.
DO NOT remove line set caps or service valve stub caps
until you are ready to make connections.
Danger of fire. Bleeding the refrigerant
charge from only the high side may result
in pressurization of the low side shell and
suction tubing. Application of a brazing torch
to a pressurized system may result in ignition
of the refrigerant and oil mixture. Check the
high and low pressures before applying heat.
To prevent the build-up of high levels of nitrogen when
purging, it must be done in a well-ventilated area. Purge
low-pressure nitrogen (1 to 2 psig) through the refrigerant
piping during brazing. This will help to prevent oxidation
and the introduction of moisture into the system.
Page 17
IMPORTANT
HORIZONTAL DRAIN PAN
(REMOVE FROM UNIT)
WARNING
WARNING
IMPORTANT
Advertisement
Table of Contents
