'XHWRRXUSROLF\RIFRQWLQXRXVSURGXFWLQQRYDWLRQVRPHVSHFL¿FDWLRQVPD\FKDQJHZLWKRXWQRWL¿FDWLRQ
©
/*(OHFWURQLFV86$,QF(QJOHZRRG&OLIIV1-$OOULJKWVUHVHUYHG³/*´LVDUHJLVWHUHGWUDGHPDUNRI/*&RUS
5()5,*(5$17'(6,*1 | 143
Refrigerant Piping Design & Layout Best Practices
Figure 38: Elevation Difference Between Outdoor
Units.
LAYOUT BEST PRACTICES
Refrigerant Piping for Separated Outdoor Units
Dual-frame and triple-frame systems should be installed with all outdoor units located next to each other. In conditions where the dual-frame
or triple-frame outdoor units need to be separated, the following rules must be followed:
General Information / Guidelines
1. Measurements.
All measurements should be made from the union center of the outdoor unit Y-branch.
2. Maximum pipe length from first outdoor unit Y-branch to farthest outdoor unit.
Total pipe length from the first outdoor unit Y-branch to the piping connection at the
farthest outdoor unit must not exceed thirty-three (33) feet.
To IDUs / HRUss
33 Feet
(Max.)
3. Elevation difference between outdoor units.
The elevation difference between the highest and lowest elevation outdoor unit must
not exceed sixteen (16) feet.
Suction
Liquid
To IDUs
Elevation
Heat Pump
Low Pressure Vapor
Liquid
To IDUs
Elevation
Heat Recovery
High Pressure Vapor
Oil Trap
8 inches
Trapping
1. When required, all traps must be inverted type
WUDSVƎLQWKHYDSRUOLQHV
a. Heat pump outdoor units would be trapped
in the suction vapor line, and heat recovery
outdoor units would be trapped in the high AND
low pressure vapor lines.
b. Inverted traps are defined as any piping that
LVƎLQDYHUWLFDOGLUHFWLRQXSWKHKRUL]RQWDO
pipe it elevates from.
Figure 36: Y-branch Measurement Location.
Figure 37: Maximum PIpe Length from First ODU
Y-branch to Farthest ODU.
Figure 39: Traps for Heat Pump and Heat Recovery Units.
Figure 40: Close Up of An Inverted Oil Trap.
To IDUs /
HRUs
Elevation
16 Feet
(Max)
To Next Page
Loading...
Need help?
General