Unit Piping - Daikin Maverick II MPS062E Installation And Maintenance Manual

Unit Piping

Condensate Drain Connection
Cleaning should be performed by qualified personnel.
Drain pans must be cleaned periodically. Material in uncleaned drain pans
can cause disease.
The unit is provided with a 1.5" male NPT condensate drain
connection. Refer to certified drawings for the exact location.
For proper drainage, level the unit and drain pan side to side
and install a P-trap.
RPS units may have positive or negative pressure sections.
Use traps in both cases with extra care given to negative
pressure sections. In Figure
minimum of 8" (203 mm). As a conservative measure to
prevent the cabinet static pressure from blowing or drawing
the water out of the trap and causing air leakage, dimension A
should be two times the maximum static pressure encountered
in the coil section in inches w.c.
Draining condensate directly onto the roof may be acceptable;
refer to local codes. Provide a small drip pad of stone,mortar,
wood, or metal to protect the roof against possible damage.
If condensate is piped into the building drainage system, pitch
the drain line away from the unit a minimum of 1/8" per foot.
The drain line must penetrate the roof external to the unit.
Refer to local codes for additional requirements. Sealed drain
lines require venting to provide proper condensate flow.
Where the cooling coils have intermediate condensate pans
on the face of the evaporator coil, copper tubes near both
ends of the coil provide drainage to the main drain pan.
Check that the copper tubes are in place and open before the
unit is put into operation.
IM 991-2 • MAVERICK II ROOFTOP
WARNING
24, dimension A should be a
On units with staggered cooling coils, the upper drain pan
drains into the lower coil drain pan through a copper tube
near the center of the drain pan. Check that this tube is open
before putting the unit into operation and as a part of routine
maintenance.
Drain pans in any air conditioning unit have some moisture in
them, allowing micro-organisms to grow. Therefore, periodically
clean the drain pan to prevent this buildup from plugging
the drain and causing the drain pan to overflow. Clean drain
pans to prevent the spread of disease. Cleaning should be
performed by qualified personnel.
Figure 24: Condensate Drain Connection
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Mechanical Installation
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