York YPAL 061, YPAL 050, YPAL 051, YPAL 060 manual Condensate Drain Piping

Installation

FILTERS

Two-inch “throwaway” filters are standard and factory installed in a filter rack located prior to the evaporator coil. Any optional pre-filters ordered with the unit will be shipped inside the unit, but must be field installed. The unit can also be ordered with an extended cabinet and 95% efficient post-filters. These post-filters are installed at the factory.

Pre-filters must always be installed ahead of the evaporator coil. Post and pre-filters must be kept clean and replaced with the same size and type as shipped with the unit. Dirty filters will reduce the capacity of the unit and may result in frosted coils and safety shutdowns. Required filter sizes and quantities are shown in Table 2-6. The unit should never be operated for any length of time without the proper filters installed in the unit.

BASE

RAILS TRAP

DRAIN

NIPPLE

NO.1 - FAN OFF

BASE

RAILS

NO. 2 - TRAP CONDITION WHEN FAN STARTS

BASE

RAILS

COOLING COIL

DRAIN PAN

NO. 3 - FAN RUNNING AND CONDENSATE

LD13269

FIG. 2-6 – DRAIN TRAP SHOWING WATER LOCATION DURING DRAW THROUGH OPERATION STAGES

CONDENSATE DRAIN

Condensate Drain Piping

The eco 2 cooling coils are located in the units so that the supply air is drawn through them. This results in the condensate being subjected to negative (-) static pressure. Unless some means of pressure equalization is provided in the condensate drains, the air rushing back through the drainpipe will cause the condensate to build up in the base rails. As the unit continues to operate, the accumulated water will be carried with the air stream, overfilling the base rails causing possible water leaks

FORM 100.50-NOM6 (1207)

into the supply duct and/or causing water damage in the building. A trap must be installed to prevent this condensate water build-up (see Figures 2-6 & 2-7).

Under high latent load conditions condensate may form in the base and side rails of the unit. The unit is designed to contain this moisture and prevent it from leaking into the conditioned space. In order to dispose of this condensate, two condensate drain connections are located on the side rails on each side of the unit and in the base rail on the return end of the unit. There are five (5) condensate drains on the unit. Since these connections are also under negative pressure, they must be trapped using the same design criteria as the main drain pan.

"H" must be at least 1 inch plus fan total static pressure

"X" = 1/2 "H"

LD05370-1

FIG. 2-7 – TRAP DETAIL FOR DRAW THROUGH APPLICATION

Condensate Drain Trap

For “Draw-through”applications install a trapped condensate drain line at unit drain connection (see Figure 2-7 according to all governing codes. “H” dimension must be at least 1 inch greater than design Total Static Pressure (TSP) of fan.

The trap and drain lines should be protected from freezing. Plumbing must conform to local codes. Use a sealing compound on male pipe threads. Install condensate drain lines from the 1-1/4 inch NPT female connections on the unit to an open drain.

The unit must be properly trapped and charged with water before the units are started.

32 JOHNSON CONTROLS