Quantech QCC3 Manual page 14

FORM QCC3-EG1 (517)
Selection Data (Cont'd)
SAMPLE SELECTION
Select an R-410A Air-Cooled Condensing Unit with a matched central station air handling
unit having the following operating conditions:
DESIGN CONDITIONS
1. An air handling unit with four large DX coils (two per circuit) having a total cooling
load of 100 MBH (83 tons).
2. The coil suction temperature required 45°F.
3. The design outdoor ambient temperature is 95°F.
4. The power supply is 460V/3
Selection
1. Enter the QCC3080CZE Rating Table (page 12).
2. The model QCC3080CZE will provide 84.1 tons with 73.5 compressor KW input at
95°C ambient air and 45°F suction pressure.
3. Calculate the compressor Kw input for the specific design conditions of 148 Kw and
35°C ambient air.
Kw =
The QCC3080CZE is the suitable selection for the design capacity.
REFRIGERANT PIPING
General – When the unit has been located in its final position, the unit piping may be con-
nected. Normal installation precautions should be observed in order to receive maximum
operating efficiencies. System piping should conform to the YORK DX piping guide form
050.40-ES2 or ASHRAE refrigeration handbook guidelines. All piping design and installa-
tion is the responsibility of the user.
QUANTECH ASSUMES NO WARRANTY RESPONSIBILITY FOR SYSTEM
OPERATION OR FAILURES DUE TO IMPROPER PIPING OR PIPING DESIGN.
Filter driers and sight glasses are shipped loose for field installation on each refrigerant
circuit. Field refrigerant piping can be connected to the condensing unit.
All expansion valves, liquid line solenoid valves, refrigerant and refrigerant piping are sup-
plied and installed by others.
Table 1 - FITTING EQUIVALENT LENGTHS* on page 16 lists refrigerant line connec-
tions sizes per unit model number.
14
∅
/60 hz.
83
x 73.5Kw = 72.5Kw
84.1Kw
QUANTECH