TABLE 3 - RECOMMENDED LINE SIZES (INCHES) REMOTE CONDENSERS
UNIT | REFRIGERANT |
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| LENGTH OF RUN |
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90MU | TYPE | ||||||||
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| DISCH | LIQUID | DISCH | LIQUID | DISCH | LIQUID | DISCH | LIQUID |
404 | 1/2 | 3/8 | 5/8 | 3/8 | 5/8 | 3/8 | 5/8 | 3/8 | |
406 | 5/8 | 3/8 | 3/4 | 3/8 | 3/4 | 3/8 | 3/4 | 3/8 | |
408 | 3/4 | 1/2 | 3/4 | 1/2 | 7/8 | 1/2 | 7/8 | 1/2 | |
412 | 7/8 | 1/2 | 7/8 | 1/2 | 7/8 | 1/2 | 5/8 | ||
504 | 5/8 | 3/8 | 5/8 | 3/8 | 3/4 | 3/8 | 3/4 | 3/8 | |
506 | 3/4 | 1/2 | 3/4 | 1/2 | 7/8 | 1/2 | 7/8 | 1/2 | |
508 | 7/8 | 1/2 | 7/8 | 1/2 | 1/2 | 5/8 | |||
512 | 7/8 | 5/8 | 5/8 | 5/8 | 5/8 | ||||
* Recommended line sizes correspond to 2 degree F drop.
NOTES:
1.Pipe sizes should never be smaller than cooling unit connection size.
2.Table is based on 2 degree F drop over entire length. Excessive (more than a few) elbows and fittings will significantly affect pressure drop. If this situation exists, line sizing must be re- calculated.
Step 11 - Install Unit Drain Line - Install a trapped |
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condensate drain line at unit drain connection The drain |
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requires standard pipe connected to condensate pan |
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nipple(s). Figure 7 shows proper trap design. |
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Determine design negative static pressure. This |
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pressure is not the same as fan total static pressure, which |
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includes pressure losses downstream as well as upstream |
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from the evaporator air fan. Always assume the worst |
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conditions, such as having return air filters clogged with |
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debris. |
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Referring to Figure 7, differential 1 must be equal to or |
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larger than negative static pressure at design operating |
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condition. Store enough water in trap to prevent losing |
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seal. Differential 2 must be equal to or larger than |
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the maximum negative static pressure. To avoid loss of |
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seal when the fan starts, differential 3 must be greater |
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than the maximum negative static pressure. |
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Do not use drain line smaller than 3/4 inch. Use hole(s) |
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provided in panel for drain line. Pitch drain line downward |
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toward scupper. Installation of a plugged tee is | FIGURE 7 - CONDENSATE DRAIN TRAP |
recommended for cleaning. Fill trap with water to make an | |
air seal. Observe all sanitary requirements. |
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Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations
Printed in U.S.A. | Pg 11 | |
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