Reznor YDSA Operation Manual - Manual (Page 24)

Form O-Y, PN 273647R1, Page 24
CAUTION: Do not use the replacement compressor as an
evacuation assist and never apply voltage to a compressor while
it is in a vacuum. See Hazard Levels, page 2.
Moisture and air are harmful to the system because they increase the condensing
temperature, raise the discharge gas temperature, cause formation of acids, and
cause oil breakdown.
CAUTION: Do not leave a circuit open to the atmosphere any longer
than minimum required for installation. POE oil in the compressor
is extremely susceptible to moisture absorption. Evacuation will
not remove moisture from POE oil.
•
Step 8. Electrical System Check
After the system has been evacuated, reconnect the electrical plug to the compressor
or the wires to the compressor terminals. It is a normal practice to replace all starting
components any time a compressor is changed.
WARNING
Do not apply voltage to the compressor when the plug is removed or
terminals disconnected.
Crankcase Heater - Connect the crankcase heater. The crankcase heater is
energized continuously and is extremely important to proper compressor operation
and long life. NOTE: See crankcase heater P/N's on page 20.
The crankcase heater must be energized for at least 24 hours before starting
the unit or after a power outage of more than 8 hours. Be sure to disable cooling
controls before turning on power to warm up crankcase heaters.
CAUTION: Crankcase heaters must be allowed to warm up
for at least 24 hours prior to startup. Disable cooling con-
trols before turning on power to warm up crankcase heaters.
•
Step 9. Charge the System (Use R-410A refrigerant only.)
Refer to the table for the approximate amount of refrigerant required. Follow the
instructions below to charge the circuit. R-410A refrigerant MUST BE charged as a
LIQUID.
NOTE: Outdoor temperature must be between 70-95°F (21-35°C) for verifying
superheat and subcooling. If temperature is not within this range, consult the
factory service department before charging.
If equipped with an optional hot gas bypass, disable the hot gas bypass valve
before charging. Locate the shutoff valve between the compressor discharge and
the hot gas bypass valve. Disable the hot gas bypass valve by closing the shutoff
valve. When measurements are complete, be sure to open the valve.
Liquid charge the high side to 80%. With the system running, add the balance of
the charge to the correct superheat and subcooling values. Refer to Step 11, page
26, and the instructions in Paragraph 3.6, page 17.
IMPORTANT: Do not release refrigerant to the atmosphere! If
required service procedures include the adding or removing
of refrigerant, the qualified HVAC service technician must
comply with all national, state or provincial, and local laws.
3.7 Compressor
Operation,
Maintenance,
and
Replacement
(cont'd)
3.0 Maintenance/Service Procedures - Unit & Cooling (cont'd)