Method For Adding Refrigerant - Daikin REYQ72TAYCU Manuel D'installation

14 .3 . Method for adding refrigerant

14 .3 . 1 . Flow chart
Step 1
Calculate additional refrigerant charge amount: R (lbs. (kg))
Step 2+3
• Close valves C and A
• Open valve B to the liquid line
• Execute pre-charging amount: Q (lbs. (kg))
• Disconnect the manifold from the suction gas line and the high/low pressure
gas line
R=Q
Step 4a
• Close valve B
• Charging is finished
• Fill in the amount on the additional refrigerant
charge label
• Go to test run
See figure location of valves next page for more information refer to
the text in this chapter.
Be sure to charge the specified amount of refrigerant in liquid state.
Since this refrigerant is a mixed refrigerant, adding it in gas form
may cause the refrigerant composition to change, preventing normal
operation.
• Before charging, check whether the refrigerant cylinder is equipped
with a siphon tube or not.
If a siphon tube
is equipped,
change the liquid
refrigerant with the
cylinder in upright
position.
• Be sure to use tools exclusively for R410A to ensure required pres-
sure resistance and to prevent foreign materials from mixing into
the system.
3P362438-9J English
R<Q
Refrigerant overcharge happened, recover
refrigerant to reach R=Q
Step 5
Open all outdoor unit stop valves
Step 6
Activate field setting [2-20]=1
Unit will start manual refrigerant charging operation.
• Open valve A
• Charge remaining amount of refrigerant P (lbs. (kg))
• Close valve A
• Push BS3 to stop manual charging
• Charging is finished
• Fill in the amount on the additional refrigerant charge label
• Go to test run
• Charging with an unsuitable substance may cause explosions and
• Refrigerant containers must be opened slowly.
• When charging a system, charging over the permissible quantity
If a siphon tube • Always use protective gloves and protect your eyes when charging
is not equipped,
change the liquid
• When the refrigerant charging procedure is done or when pausing,
refrigerant with the
cylinder in upside-
down position.
A
B
C
Step 4b
Close valve B
R=Q+P
NOTE
accidents, so always make sure that the appropriate refrigerant
(R410A) is charged.
CAUTION
may cause liquid hammer.
refrigerant.
close the valve of the refrigerant tank immediately. If the tank is left
with the valve open, the amount of refrigerant which was properly
charged may get off point. More refrigerant may be charged by any
remaining pressure after the unit has stopped.
R>Q
R>Q
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