Klimaire CSM42H2P16 - Manual (Page 7)

1. Install the lines with as few bends as possible. Care must be taken not to damage
the couplings or kink the tubing. Use clean hard drawn Copper tubing where no
appreciable amount of bending around obstruction is necessary, if soft copper must
be used, care must be taken to avoid sharp bends which may cause a restriction.
2. The lines should be installed so that they will not obstruct service access to the coil,
3.5 PRECAUTIONS DURING LINE INSTALLATION
air handling system or filter.
CAUTION
This system uses R410A refrigerant which operates at higher pressure than
R-22. No other refrigerant may be used in this system. Gauge sets, hoses,
refrigerant containers, and recovery system must be designed to handle
R410A. If you are unsure, consult the equipment manufacturer.
The outdoor unit must be connected to the indoor coil using field supplied refrigerant
grade copper tubing that is internally clean and dry. Units should be installed only with
the tubing sizes for approved system combinations. The charge given is applicable for
total tubing lengths up to 25 feet.
NOTE
Using a larger than specified line size could result in oil return problems. Using
too small a line will result in loss of capacity and other problems caused by insuf-
ficient refrigerant flow. Slope horizontal vapor lines at least 1" every 20 feet
toward the outdoor unit to facilitate proper oil return.
3. Care must also be taken to isolate the refrigerant lines to minimize noise transmis-
sion from the equipment to the structure.
4. The vapor line and liquid line must be insulated with a minimum of 1/2" foam rubber
insulation (Armafiex or equivalent). Tape and suspend the refrigerant lines as shown.
DO NOT allow tube metal-to-metal contact. See Fig. 3.
5. Use PVC piping as a conduit for all underground installations as shown in Fig. 4.
Buried lines should be kept as short as possible to minimize the build up of liquid
refrigerant in the vapor line during long periods of shutdown.
6. Pack fiberglass insulation and a sealing material such as perma gum around refrig-
erant lines where they penetrate a wall to reduce vibration and to retain some flexi-
bility.
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