Reznor MAPS III, Cabinet D RECB Users Manual - Manual (Page 15)

Form O-MAPSIII Cabinet D, P/N 222918R9, Page 15
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.
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Step 8. Check the Electrical System
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 ener-
gized continuously and is extremely important to proper compressor operation and
long life.
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 controls before
turning on power to warm up crankcase heaters.
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Step 9. Charge the System (Use R-410A refrigerant only.)
Refer to the table on page 16 for the approximate amount of refrigerant required
and 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 valve, disable the hot gas bypass
valve before charging. The method of disabling the bypass valve depends
on whether or not there is a shutoff valve in the line between the compressor
discharge and the hot gas bypass valve.
If there is a shutoff valve in the line between the compressor discharge and the
hot gas bypass valve, close the shutoff valve. When measurements are complete,
open the valve.
If there is not a shutoff valve in the line between the compressor discharge and
the hot gas bypass valve, disable the bypass by removing the cover from the
bypass valve and adjusting the spring tension. Count and record the number of
counterclockwise turns until the spring tension is relieved. (When ready to return
the bypass valve to its original setting, turn the spring the same number of turns
clockwise. To check setting, see instructions in Paragraph 3.9.5.)
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 federal, state or provincial, and local laws.
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
17, and the instructions in Paragraph 3.5, page 9.