Trane R Series, Installation Operation & Maintenance

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48 RLC-SVX07A-EN
Installation - Remote Condenser
CAUTION
Catastrophic Damage!
Tables 8 , 9 and 10 show line sizing for leaving evaporator water
temperatures ranging from 0 F to 60 F. Only units with a “2” or
“4” in the 12th digit of the model number of the RTUA unit can be
piped using Tables
8 and Unless the RTUA unit is designed for
low temperature applications, Table 8 must be used. Catastrophic
damage may result if the incorrect table is used for pipe sizing.
2. The total distance between the RTUA and the aircooled condenser must
not exceed 200 actual feet or 300 equivalent feet.
3. Liquid line risers must not exceed 15 feet from the base of the air-cooled
condenser.
4. Discharge line risers cannot exceed an elevation difference greater than
100 actual feet without a minimum of 2% efficiency decrease.
5. Refer to Figures 23 , 24 and 25 for location of recommended traps.
6. Circuit #1 on the condenser must be connected to Circuit # 1 on the
RTUA unit.
CAUTION
Equipment Damage!
If circuits are crossed, serious equipment damage may occur.
NOTE: The piping shown in Figures 23 , 24 and 25 are for one circuit only.
The piping for the other circuit should follow the same guidelines.
Equivalent Line Length
To determine the appropriate size for field installed liquid and discharge lines,
it is first necessary to establish the equivalent length of pipe for each line,
including the added flow resistance of elbows, valves, etc. An initial approxi-
mation can be made by assuming that the equivalent length of pipe is 1.5
times the actual pipe length.
It is also necessary to know the capacity (tons) for each circuit. Circuit capac-
ities for each RTUA unit are listed in
Table 6 .
Table 6 RTUA Circuit Capacities
MODEL CIRCUIT 1 CIRCUIT 2
70 35 35
80 40 40
90 50 40
100 50 50
110 60 50
125 60 60