III. COMPLETE REFRIGERANT PIPING CONNECTIONS
Suction connection is sweat with plastic cap; liquid connec- tion is sweat with plastic cap. Refer to Table 2 for the proper line sizes. Follow standard piping practices.
Table 2 Ð Refrigerant Piping Sizes
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| LINEAR LENGTH OF PIPING Ð ft |
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UNIT |
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| Line Size (in. OD) |
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575A |
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| L | S | L |
| S | L | S | L | S |
090 | 1¤2 | 11¤8 | 5¤8 |
| 11¤8 | 5¤8 | 13¤8 | 3¤4 | 13¤8 |
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| LEGEND |
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L Ð Liquid Line | OD Ð Outside Diameter | S Ð Suction Line |
NOTES:
1.Pipe sizes are based on a 2° F loss for liquid and suction lines.
2.Pipe sizes are based on the maximum linear length shown for each column, plus a 50% allowance for ®ttings.
3.Charge units with
A. Size Refrigerant Lines
Consider length of piping required between 575A unit and
Table 3 Ð Liquid Line Data
UNIT | MAX |
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ALLOWABLE | LIQUID LINE | ||||
575A | |||||
LIQUID LIFT (ft) |
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| Max Allowable | Max Allowable | |
090 | Heating | Cooling | Pressure Drop | Temp Loss | |
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| (psi) | (F) | ||
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| 75 | 65 | 7 | 2 |
LEGEND
db Ð Dry Bulb wb Ð Wet Bulb
NOTES:
1.The liquid lift in cooling mode is based on 80/67 F (db/wb ) entering
2.The liquid lift in heating mode is based on 70/60 F (db/wb) entering
B. Filter Drier and Moisture Indicator
See Fig. 5. The ®lter drier is factory supplied and ®eld- installed in the liquid line. Moisture indicator is ®eld- supplied and should be installed just after liquid line shutoff valve. Do not use a receiver; there is none provided with unit and one should not be used.
NOTE: Unit is shipped with
Pass nitrogen or other inert gas through piping while braz- ing to prevent formation of copper oxide.
C. Liquid Line Solenoid Valve
A
NOTE: Part number EF23JS214 (Sporlan model CB14S2,
Wire the solenoid in parallel with the compressor contactor coil.
Install the LLSV near the outdoor unit. The ¯ow arrow must be pointed toward the outdoor unit.
D. Safety Relief
A fusible plug is located on top of the accumulator. See Fig. 6. Note that all safety relief components are factory installed. Do not cap fusible plug. If local code requires additional safety device(s), install as directed.
E.Suction Piping at Indoor Coil and TXV Sensing Bulb Location
Suction piping must be designed so that refrigerant is thor- oughly mixed after it leaves the indoor coil suction header. The thermostatic expansion valve (TXV) sensing bulb must also be correctly located. This ensures that the TXV sensing bulb receives reliable readings. Install the suction piping as follows:
1.Install a minimum of two
2.Locate the TXV bulb on a vertical riser where possible. If a horizontal location is necessary, secure the bulb at approximately the 4 o'clock position or the 8 o'clock po- sition. See Fig. 7.
3.Make sure that the piping system has no inherent oil traps, and that the piping layout does not allow oil to migrate into an idle indoor coil.
4.Complete refrigerant piping from indoor coil to outdoor coil before opening liquid and suction lines at the 575A unit. See Tables 1 and 2 for piping selection data.
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