Unitary products group KBU060, Руководство по установке

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292427-BIM-A-0307
10 Unitary Products Group
DRAIN CONNECTION
The drain line must be trapped because the coil is located on
the negative side of the supply air blower. It must be pro-
tected from freezing temperatures.
A 7/8" O.D. drain connection extends through right hand side
of cabinet. Refer to Figure 10 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 dam-
age 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.
NOTE: The unit may have to be raised off the floor to allow
enough height for the drain trap.
REFRIGERANT MAINS
Many service problems can be avoided by taking adequate
precautions to provide an internally clean and dry system and
by using procedures and materials that conform with estab-
lished standards.
Hard drawn copper tubing should be used where no appre-
ciable amount of bending around pipes or other obstructions
is necessary. Use long radius ells wherever possible with
one exception. Use short radius ells for traps in all vertical
suction risers. If soft copper must be used, avoid sharp
bends, which may cause a restriction.
Fiberglass insulation and a sealing material such as perma-
gum should be packed around refrigerant lines where they
penetrate a wall to reduce vibration and to retain some flexi-
bility.
Support all refrigerant lines at minimum intervals with suitable
hangers, brackets or clamps. Braze all copper-to-copper
joints with Sil-Fos 5 or equivalent brazing material. Do not
use soft solder.
Never braze or solder the liquid and suction lines together.
The complete suction line should be insulated with no less
than 1/2" ARMAFLEX or equivalent. If the liquid and suction
lines are to be taped together for support purposes, they
must be completely insulated from one another.
INSTALLING REFRIGERANT MAINS
The blower units are shipped with the coil section side panels
suitable for right hand piping connections when viewed from
the return air side of the unit.
In left hand piping is required, the two panels on the right side
of the coil section can be interchanged with the single panel
on the left side of the coil section.
When left-hand piping connections are installed, the suction
line must be insulated to prevent moisture from condensing
and being carried into the blower section.
The liquid and suction connections must be piped outside the
unit. Refer to the unit drawing for locations and the dimen-
sions 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.
The blower units are shipped with the coil section side panels
suitable for right hand piping connections when viewed from
the return air side of the unit.
In left hand piping is required, the two panels on the right side
of the coil section can be interchanged with the single panel
on the left side of the coil section.
When left-hand piping connections are installed, the suction
line must be insulated to prevent moisture from condensing
and being carried into the blower section.
NOTE: These units can only be piped from one side of the
unit.
FIGURE 10 - RECOMMENDED DRAIN PIPING
Dry nitrogen should flow through the system at all
times when heat is being applied and until the joint
has cooled.