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7
TEST RUN
• See the installation manual accompanying indoor unit.
• Be sure to perform test run of indoor unit individually, and then to perform all the units simultaneously.
• After the unit is turned off, the unit will not start operation for 3 minutes to protect the unit.
8
ITEMS TO CHECK
Is the specified power supply voltage used?
Is the connecting cable fixed to terminal board firmly?
Is the ground wire connected properly arranged?
Is the unit drainage properly?
Is there any gas leakage at the pipe connection?
Are refrigerant pipes for gas and liquid insulated individually?
Is the unit installed horizontally?
-17°F(-27°C) AUTO STOP FUNCTION
• Factory setting of this function is OFF. To activate this function, slide the
SELECT switch(DSW1) #1 to ON.
• During the heating operation, the unit will automatically stop when the
outdoor temperature drops below -21°F(-29.4°C) to prevent the outdoor
unit from the damage caused by the freezing of the drained water. The unit
will stop its operation for 4 hours and then resume the operation when the
outdoor temperature rises above -17°F(-27°C).
PUMP DOWN
Pump down is adopted in the case of unit removal for re-installation, abandonment, repair etc.
Pump down is to collect the refrigerant into the outdoor unit.
PROCEDURE USING GAUGE MANIFOLD (Recommended procedure)
(1) Connect the gauge manifold hose to the service port of the stop valve(gas side).
(2) To start pump down, press the PUMP DOWN button(SW1) for 5 seconds or more.
• All LED (LED1A, LED1B, LED1C) on the display board will blink alternately.
• The OPERATION lamp on the indoor unit will blink and three BEEP will be emitted.
(3) After 5-10 minutes, fully close the stop valve (liquid side).
(4) Close the stop valve (gas side) when the compound gauge reading becomes almost 0 MPa(0 cmHg).
(5) To stop the pump down, press the PUMP DOWN button(SW1) for 5 seconds or more.
(6) Disconnect the gauge manifold hose from the service port.
PROCEDURE WITHOUT USING GAUGE MANIFOLD
(1) To start pump down, press the PUMP DOWN button (SW1) for 5 seconds or more.
• All LED (LED1A, LED1 B, LED1C) on the display board will blink alternately.
• The OPERATION lamp on the indoor unit will blink and three BEEP will be emitted.
(2) After 5-10 minutes, fully close the stop valve (liquid side).
(3) After 2-3 minutes, close the stop valve (gas side) fully.
(4) To stop the pump down, press the PUMP DOWN button (SW1) for 5 seconds or more.
Caution:
• Make sure that the compressor is turned off before removing the refrigerant pipes. Otherwise, it will cause
burst and injury.
• Do not perform PUMP DOWN when refrigerant is leaking or there is no refrigerant in the refrigerant cycle.
Otherwise, it will cause burst and injury.
Note:
• Wait more than 90 seconds after finishing pump down, and turn off the circuit breaker.
Explanation to customer
• Explain to the customer how to use and maintain the
system, referring to the operation manual.
• Ask the customer to carefully read the operation manual.
• When the system has been set up, hand the installation
manual to the customer.
EN-5
SELECT
switch
(DSW1)
Stop valve
(liquid side)
Compound
gauge
Service
port
Stop valve
(gas side)
PUMP DOWN button
PUMP DOWN button
(SW1)
(SW1)
WIRE CHECK button
WIRE CHECH button
(SW2)
(SW2)
Lo
Hi
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