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C99097
Fig. 20 -- Refrigerant Circuit
Compressor
Access Panel
Blower
Access
Panel
Control
Access
Panel
A09214
Fig. 21 -- Un it Access Panels
Step 8 — Pr essure Switches
Pressure switches are protective devices wired into control circuit
(low voltage). They shut off compressor if abnormally high or low
pressures are present in the refrigeration circuit. These pressure
switches are specifically designed to operate with Puron (R --410A)
systems. R--22 pressure switches must not be used as replacements
for the Puron (R--410A) system.
Step 9 — Loss of Charge Switch
This switch is located on the liquid line and protects against low
suction pressures caused by such events as loss of charge, low
airflow across indoor coil, dirty filters, etc. It opens on a pressure
drop at about 20 psig. If system pressure is above this, switch
should be closed. To check switch:
1. Turn off all power to unit.
2. Disconnect leads on switch.
3. Apply ohm meter leads across switch. You should have
continuity on a good switch.
NOTE: B ecause these switch es are attached to refrigeration
system under pressure, it is not advisable to remove this device for
troubleshooting unless you are reasonably certain that a problem
exists. If switch must be removed, remove and recover all system
charge so that pressure gauges read 0 psi. Never open system
without breaking vacuum with dry nitrogen.
Step 10 — High-- Pressure Switch
The high--pressure switch is located in the discharge line and
protects against excessive condenser coil pressure. It opens at 650
psig.
High pressure may be caused by a dirty outdoor coil, failed fan
motor, or outdoor air recirculation.
To check switch:
1. Turn off all power to unit.
2. Disconnect leads on switch.
3. Apply ohm meter leads across switch. You should have
continuity on a good switch.
Step 11 — Copeland Scroll Compressor (Puron
Refrigerant)
The compressor used in this product is specifically designed to
operate with Puron (R--410A) refrigerant and cannot be
interchanged.
EXPLOSION HAZARD
Failuretofollow this warning could result in personal injury,
death or property damage.
Wear safety glasses and gloves when handling refrigerants.
Keep torches a nd other ignitionsou rcesaway from refrigerant
and oils.
!
WARNING
The scroll compressor pumps refrigerant throughout the system by
the interaction of a stationary and an orbiting scroll. T he scroll
compressor has no dynamic suction or discharge valves, and it is
more tolerant of stresses caused by debris, liquid slugging, and
flooded starts. The compressor is equipped with an internal
pressure relief port. The pressure relief por t is a safety device,
designed to protect against extreme high pressure. The relief port
has an operating range between 550 and 625 psi differential
pressure.
Step 12 — Refrigerant Sys tem
This step covers the refrigerant system of the 607 ----A, including
the compressor oil needed, servicing systems on roofs containing
synt hetic materials, the filter drier and refrige rant charging .
Refrigerant
PROPERTY HAZARD, PERSONAL INJURY OR
ENVIRONMENTAL HAZARD
Failuretofollowthiswarningcouldresultin propertydamage
or personal injury or death.
This system uses Puron (R--410A) refrigerant which has
higher operating pressures than R-- 22 and other refrigerants.
No other refrigerant may be used in this system. Gauge set,
hoses,and recoverysystemmustbedesignedtohandlePuron.
If you are unsure consult the equipment manufacturer.
!
WARNING
607C-- --A