EMI VCH Series Installation, operation and maintenance manual - page 4
Made in Rome, New York, USA
Comfort Where It Counts
4
Liquid
Suction
18
3/8"
5/8"
40
24
3/8"
3/4"
45
30
3/8"
3/4"
68
18
3/8"
5/8"
43
24
3/8"
3/4"
48.5
24
3/8"
7/8"
57.5
30
3/8"
7/8"
59.0
VCH
HCA
HCH
Note:
Add .5oz /ft. for interconnect refrigerant piping to the ab ove
charge amounts
PIPING SPECIFICATIONS & CHARGE
Unit
Model
Ref. Line Sizes
Ref. Charge
Oz. R-22
5. Use of a liquid line filter-drier is recommended. Filter-
driers may be supplied by EMI or be field supplied.
Size the filter-drier properly and follow manufacturer’s
installation recommendations. Be sure to adjust
refrigerant charge as required when adding a filter-
drier.
6. Evacuate and charge the unit.
NOTE:
All panels must be in place when operating
the unit for test or charging.
Condensing units are factory charged and shipped with
the service valves front-seated. Ports are provided on the
service valves for evacuation and charge. Use a mani-
fold/gauge set. Test the tubing for leaks. Do not release
the refrigerant in the condensing unit until leak check and
evacuation are completed. Be certain there is no pres-
sure in the system when repairing a leak. Using a suitable
vacuum pump, evacuate the tubing and indoor section to
a minimum of 500 microns (service valves remain front-
seated). Release the refrigerant from the condensing unit
by back-seating the service valves. Always replace and
tighten the caps. The system charge will require adjust-
ments for tubing run, driers, and evaporator coils. EMI rec-
ommends charging by “Superheat.”
START-UP
1. Start the unit and adjust the refrigerant charge by the
“Superheat” or “Temperature vs. Pressure”
method. Data chart is available on page 5
. Avoid
overcharging.
2 Replace any panels and covers removed during
installation and start-up. Thoroughly test the system
for proper operation in cooling. Check the indoor unit
and thermostat for proper operation.
3. Do a final visual inspection. Check for weather
tightness. Repair/correct any deficiencies.
TROUBLESHOOTING
Check to see if the unit has power and if the thermostat is
satisfied. If the unit has power and the thermostat is not
satisfied, refer to the wiring diagram and check control
components for continuity. To obtain further technical
service for this unit, please contact the factory.