Daikin VRV IV RXYQ TYDN Series, Engineering Data

Page: 40 / 91

EDUS341411-N Installation Manual
Installation of Outdoor Units 41
3P362438-1B
31 3P362438-1B English
Perform the test procedure as described in 15.4.2. Test operation on
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INFORMATION
r When a malfunction is detected during the procedure (e.g., in case
of closed stop valve), a malfunction code will be displayed. In that
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the malfunction accordingly. Resetting the malfunction can be done
by pushing BS3. The procedure can be restarted from 6B).
r Aborting the manual refrigerant charge is possible by pushing BS3.
The unit will stop and return to idle condition.
Information which may occur during additional refrigerant charging
procedures:
P8: Indoor unit freeze up prevention
Action: Close valve A immediately. Reset malfunction by pushing
BS1. Retry auto charge procedure.
P2: Abnormal low pressure drop
Action: Close valve A immediately. Reset malfunction by pushing
BS1. Check following items before retry auto charge procedure:
- Check if the gas side stop valve is opened correctly.
- Check if the valve of the refrigerant cylinder is opened.
- Check if the air inlet and outlet of the indoor units are not ob-
structed.
E-2
:
Indoor temperature is out of range.
E-3
:
Outdoor temperature is out of range.
E-5
: An indoor unit which is not compatible with automatic refrigerant
charge functionality is installed (e.g., Mini-split indoor unit, etc.)
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function code and take corresponding action, 15.5. Malfunction code
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14.3.3. Final charge adjustment
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following operation only when if the most adequate refrigerant for the
best performance is required.
The outdoor temperature must be between 60°F (16°C) and 97°F
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Purge gauge lines. Connect service gauge manifold to the service
port between the compressor and the reversing valve in each outdoor
unit. Run the system for 30 minutes in cooling by the forced operation
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then check subcooling as detailed in the following sections.
Subcooling = Sat. Liquid Temp. – Liquid Line Temp.
1 Temporarily install a thermometer on the liquid line between the
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makes adequate contact and is insulated for best possible read-
ings. Use liquid line temperature to determine sub cooling.
2 Check subcooling for each outdoor unit and calculate the average
subcooling of the outdoor unit. Systems should have a subcooling
of 11±3°F (6±2°C).
a. If average subcooling is low, add charge to raise subcooling to
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(2kg))
b. If average subcooling is high, remove charge to lower the sub-
cooling to 11±3°F (6±2°C)
14.3.4. Checks after adding refrigerant
r
Are the stop valves for liquid and gas open?
r Is the amount of refrigerant, that has been added, recorded on the
refrigerant charge label?
NOTE
Make sure to open all stop valves after (pre-) charging the refrigerant.
Operating with the stop valves closed will damage the compressor.
15.
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INFORMATION
It is important that all information in this chapter is read sequentially by
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DANGER: ELECTRICAL SHOCK
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15.1. Checks before initial start up
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unit be powered up.
1 Installation
Check that the unit is properly installed, to avoid abnormal noises
and vibrations when starting up the unit.