York CSA DH 036 Spécifications télécharger pdf (Page 92)

JOHNSON CONTROLS

2-62

FORM 102.20-N1 (1109)

Installation

Two or more drains on same side of unit must be trapped

individually before drain lines can be combined and

routed to a suitable drain (see Fig. 2-93).

If distance from drain pan outlet to trap exceeds 10',

install additional clean outs for each 10' segment

of horizontal drain line (min. 1/4 in. per foot fall

required).

On initial startup, it may be necessary to ll the trap

manually.

Elevating Unit for Gravity Floor Drain

Connections

On indoor units, the installer must provide a means of

pumping or draining coil condensate water away from

the unit. The installer may have to elevate the unit to

provide space below the condensate drain of the unit to

install properly designed drain trap(s) to permit gravity

ow of condensate water from the drain pan (see Figs

2-3, 2-4 and 2-5).

Duct Connections

Duct must have positive seal to unit

openings. Outdoor baserails are avail-

able in 3", 6", 8" and 10" heights.

Contractor is responsible for providing

ductwork to include baserail height.

All ductwork should be supported in-

dependently from the unit.

LD06345-1

FIG. 2-93 – COMBINING DRAIN LINES

TRAPS

Duct Connection Guidelines

See Fig. 2-94.

Duct connections to the unit may be made directly

except when the unit has external isolation. Then duct

connections should be exible material and should be

installed so they are sufciently loose. Duct connections

should be designed and installed according to AMCA

Standards 200 and 201 as a minimum. Duct turns and

transitions must be made carefully to hold friction loss

to a minimum. Avoid short turns. Duct elbows should

contain splitters or turning vanes.

The Effective Duct Length connected to the fan or

unit discharge should run in a straight line for at least

2.5 Equivalent Discharge Diameters* for up to 2500

FPM fan outlet velocity and one additional diameter

for each additional 1000 FPM fan outlet velocity. This

ductwork should be no greater than 105.5% or no less

than 85.5% of the discharge area. In addition, the

slope of the transition elements should not be greater

than 15% for converging elements, or greater than 7%

for diverging elements.

* To nd the Equivalent Discharge Diameter:

The letters “a” and “b” represent the height and width

of the discharge.

A duct turn should be in the same direction as the

fan rotation. Never deadhead the discharge into the

at surface of a plenum.

  

FIG. 2-94 – RECOMMENDED DISCHARGE DUCT

ARRANGEMENT WHEN TURNS ARE

REQUIRED

Effective Duct Length

LD06335-2

1 2 ... 87 88 89 90 91 92 93 94 95 96 97 ... 139 140

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York CSA DH 036 Spécifications Page 92

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