CAUTION: Always puncture sealing caps and discs with a
small drill bitbefore unbrazing to preventthe pres-
sure in the line from blowing them off.
Before starting installation of the mains be sure the unit has
not developed a leak in transit by drilling a small hole in the
sealing discs. If pressure still exists, the circuit may be
considered leak free. If pressure does not exist the coil
should be leak tested.
NOTE: To minimize the possibility of system failure due to dirt
andmoisture,afilter-driermustbeinstalledintheliquid
lineas closetotheevaporatoraspossible. Filter-driers
arenotsuppliedwiththeevaporatorblowers. Theyare
supplied with the matching condensing sections.
If check valves are required, they must be purchased and
installed in the field. The temperature required to make or
break a brazed joint is sufficiently high to cause oxidation of
the copper unless an inert atmosphere is provided.
CAUTION: Dry nitrogen should flow through the system at all
times whenheat is being applied and untilthe joint
has cooled.
The liquid and suction connections must be piped outside
the unit. Refer to the unit drawing for locations and the
dimensions of these connections.
Before brazing the refrigerant lines to these connections,
remove the short panel from the unit frame and slide it
(along with the grommets) onto the refrigerant lines. After
the brazed joints have cooled, slide the panel back into place
and secure it to the unit frame.
NOTE: These unitscan only be piped from onesideofthe unit.
EXPANSION VALVE BULB
On KBU060 and KBC090 units, the expansion valve bulb must
be fastened in a 4 o’clock position to the suction line outside the
cabinet after the piping connections have been made.
On KBC120 units, fasten the expansion valve bulb on the
suction header 8" below the top of the header, and adjacent
to the coil.
Use the clamps provided with the valve to secure the bulb in
position.
DRAIN CONNECTION
The drain line must be trapped because the coil is located
on the negative side of the supply airblower. It must be
protected from freezing temperatures.
A 7/8" O.D.drain connection extends through right hand side
of cabinet. Refer to Figure 8 for recommended drain piping.
The drain connection is located on the same side of the unit
as the refrigerant connections. The line should be insulated
where moisture dripping will be objectionable or cause
damage to the area.
The 3" dimension must equal or exceed the negative static
pressure developed by the supply air blower. If it does not,
the condensate will not drain properly and may overflow the
drain pan. The trap must be at least 2-1/2" deep to maintain
a water seal under all operating conditions, especially during
blower start-up.
1"DUCT FLANGE
HEATER ELEM ENT
CHAMBER CONTROL BOX
ACCESS PANEL
SUPPLY
AIR
A
VERTICALARRANGEMENT
SHO W N
N otU L approved w ith installation ofa
Supply A irP lenum accessory orw ith
a KBU 060 unitinstalled horizontally.
B
BLO W ER
UNIT
MODEL 5 TON 7-1/2 & 10 TON
A 16-7/8 19-1/4
B 20-1/8 22-1/4
FIG. 4 - ELECTRIC HEATER ACCESSORY
ALTERNATE
AIR DISCHARGE
BLO W ER
UMIT
SUPPLY
AIR
TO P
PANEL
GRILLE
VERTICAL
ARRANGEMENT
SHOW N
Plenum should be field m ounted on the supply airend ofblow er
units foreitherverticalorhorizontalapplication. Forreardischarge,
rotate plenum 180 degrees. Forhorizontaldischarge on a horizontal
unit,the grille paneland the top panelw illbe arranged differently.
R eferto Form 550.13-N 10.2U forinstallation and assem bly instructions.
FIG. 5 - SUPPLY AIR PLENUM ACCESSORY
BLO W ER
UNIT
BLO W ER UNIT
BASE PANEL
FO R VER TIC AL
ARRANGEM ENT
ONLY
W HEN OUTDOOR AIR IS REQUIRED,A HOLE CAN BE
CUT IN BACK PANEL FOR CONNECTING DUCTW ORK.
VERTICAL
ARRANGEMENT
SHO W N
FIG. 6 - BASE ACCESSORY FIG. 7 - RETURN AIR GRILLE ACCESSORY
550.23-N2Z
6Unitary Products Group
