Additional Charge; Gas Leakage Inspection; Electrical Wiring; Notes For Electrical Wiring - Rheem RHMV4821SNACJA Manual De Instalación

(1) Remove the cap, and connect the gauge manifold and the vacuum pump to the
charging valve by the service hoses.
(2) Vacuum the indoor unit and the connecting pipes until the pressure gauge
indicates -0.1 MPa (-76 cmHg).
(3) When -0.1 MPa (-76 cmHg) is reached, operate the vacuum pump for at least
60 minutes.
(4) Disconnect the service hoses and fi t the cap to the charging valve to the specifi ed
torque.
(5) Remove the blank caps, and fully open the spindles of the 3-way (Liquid) and 3-way
(Gas) valves with a hexagon wrench.
(6) Tighten the blank caps of the 3-way (Liquid) valve and 3-way (Gas) valve to the
specifi ed torque.
3/8 in (9.52 mm)
Blank
cap
5/8 in (15.88 mm)
Charging port cap (R410A)
Connecting pipe
Outdoor unit
Service hose
with valve core
Charging port
Cap
Gauge manifold
Lo Hi
Vacuum pump
Service hose

5.5. Additional charge

• When moving and installing the air conditioner, do not mix gas other than the specifi ed
refrigerant R410A inside the refrigerant cycle.
• When charging the refrigerant R410A, always use an electronic balance for refrigerant
charging (to measure the refrigerant by weight).
• When charging the refrigerant, take into account the slight
change in the composition of the gas and liquid phases,
and always charge from the liquid phase side whose
composition is stable.
• Add refrigerant from the charging valve after the completion
of the work.
• If the units are further apart than the maximum pipe length,
correct operation cannot be guaranteed.

5.6. Gas leakage inspection

• After connecting the piping, check the all joints for gas leakage with gas leak detector.
• When inspecting gas leakage, always use the vacuum pump for pressure. Do not use
nitrogen gas.
En-8
9374995721_IM.indb 8 9374995721_IM.indb 8
Tightening torque
15 to 18 ft·lb (20 to 25 N·m)
22 to 26 ft·lb (30 to 35 N·m)
9 to 12 ft·lb (12.5 to 16 N·m)
Blank cap
Hexagon wrench
Use a 4 mm hexa-
gon wrench.
3-way valve
CAUTION
Use a clean gauge manifold
and charging hose for R410A
exclusively.
CAUTION
Gas
Liquid
CAUTION

6. ELECTRICAL WIRING

6.1. Notes for electrical wiring

• Wiring connections must be performed by a qualifi ed person in accordance with the
specifi cations. The voltage rating for this product is 208-230 V at 60 Hz. It should be
operated within the range of 188 to 253 V.
• Before connecting the wires, make sure the power supply is OFF.
• Use a dedicated power supply circuit. Insuffi cient power capacity in the electrical
circuit or improper wiring may cause electric shock or fi re.
• Install a breaker at the power supply for each outdoor unit. Improper breaker selection
can cause electric shock or fi re.
• Install a leakage circuit breaker in accordance with the related laws and regulations.
An improperly installed electrical box cover can cause serious accidents such as
electric shock or fi re through exposure to dust or water.
• A circuit breaker is installed in the permanent wiring. Always use a circuit that can
trip all the poles of the wiring and has an isolation distance of at least 1/8 in (3 mm)
between the contacts of each pole.
• Use designated cables and power cables. Improper use may cause electric shock or
fi re by poor connection, insuffi cient insulation, or over current.
• Do not modify power cable, use extension cable or branch wiring. Improper use may
cause electric shock or fi re by poor connection, insuffi cient insulation or over current.
• Connect the connector cable securely to the terminal. Check no mechanical force
bears on the cables connected to the terminals. Faulty installation can cause a fi re.
• Use ring type terminals and tighten the terminal screws to the specifi ed torques,
otherwise, abnormal overheating may be produced and possibly cause serious
damage inside the unit.
• Make sure to secure the insulation portion of the connector cable with the cable
clamp. Damaged insulation can cause a short circuit.
• Fix cables so that cables do not make contact with the pipes (especially on high
pressure side). Do not make power supply cable and connection cable come in
contact with valves (Gas).
• Never install a power factor improvement condenser. Instead of improving the power
factor, the condenser may overheat.
• Be sure to perform the earthing (grounding) work.
Do not connect earthing (grounding) wires to a gas pipe, water pipe, lightning rod or
earthing (grounding) wire for a telephone.
- Connection to a gas pipe may cause a fi re or explosion if gas leaks.
- Connection to a water pipe is not an effective earthing (grounding) method if PVC
pipe is used.
- Connection to the earthing (grounding) wire of a telephone or to a lightning rod may
cause a dangerously abnormal rise in the electrical potential if lightning strikes.
Improper earthing (grounding) work can cause electric shocks.
• Securely install the electrical box cover on the unit. An improperly installed service
panel can cause serious accidents such as electric shock or fi re through exposure to
dust or water.
• The primary power supply capacity is for the air conditioner itself, and does not
include the concurrent use of other devices.
• Do not start operation until the refrigerant is charged completely. The compressor will
fail if it is operated before the refrigerant piping charging is complete.
• Connection cable between indoor unit and outdoor unit is 208-230 V.
• Be sure not to remove thermistor sensor etc. from power wiring and connection
wiring. Compressor may fail if operated while removed.
• Start wiring work after closing branch switch and over current breaker.
• Use an earth leakage breaker that is capable of handling high frequencies. Because
the outdoor unit is inverter controlled, a high-frequency earth leakage breaker is
necessary to prevent a malfunction of the breaker itself.
• When using an earth leakage breaker that has been designed solely for earth (ground)
fault protection, be sure to install a fuse-equipped switch or circuit breaker.
• Do not connect the AC power supply to the connection line terminal board. Improper
wiring can damage the entire system.
• Do not use crossover power supply wiring for the outdoor unit.
• If the temperature surrounding the breaker is too high, the amperage at which the
breaker cuts out may decrease.
• When connecting the power supply cable, make sure that the phase of the power
supply matches with the phase of the terminal board. If the phases do not match, the
compressor will rotate in reverse and will not be able to compress.
R410A
(1) Service cover removal
• Remove the two mounting screws.
• Remove the service cover by pushing downwards.
Direction of
the service
panel removal
WARNING
CAUTION
Hook
(3 places)
Service cover
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