Daikin DZ18VC Series Installation Instructions Manual page 8

Step 2. Connect Heat Pump Unit to System
OPEN THE LIQUID VALVE FIRST! I
,
OPENED FIRST OIL FROM THE COMPRESSOR MAY BE DRAWN INTO THE
EEV,
INDOOR COIL RESTRICTING REFRIGERANT FLOW AND AFFECTING
.
OPERATION OF THE SYSTEM
POSSIBLE REFRIGERANT LEAK!
T
O AVOID A POSSIBLE REFRIGERANT LEAK
UNTIL THE TOP OF THE STEM IS
E
NSURE VALVES ARE OPEN AND ADDITIONAL CHARGE IS ADDED PER
CHART BEFORE APPLYING POWER
When opening valves with retainers, open each valve only
until the top of the stem is 1/8" from the retainer. To avoid loss
of refrigerant, DO NOT apply pressure to the retainer. When
opening valves without a retainer, remove service valve cap
and insert a hex wrench into the valve stem and back out the
stem by turning the hex wrench counterclockwise. Open the
valve until it contacts the rolled lip of the valve body.
• Low voltage terminal C from indoor unit must connect to low voltage terminal C on thermostat and low voltage
terminal R on thermostat. Verify wires are not reversed. NOTE: The order of the terminals of the indoor unit and the
Daikin One+ Smart Thermostat are different. See System Wiring.
• Do not attach any wires to the R & C Terminals on the Heat Pump Unit, as they are not needed for inverter unit setup.
• Data line terminals #1 and #2 are polarity sensitive. Only the data lines, 1 and 2, are required between the indoor and
outdoor units.
• Data line terminal #1 from outdoor unit must connect to terminal #1 on indoor unit and thermostat and data line
terminal #2 from outdoor unit must connect to terminal #2 on indoor unit and thermostat. Verify wires are not
reversed.
• Calculate the Liquid Line Set length and weigh in 0.6 ounces per foot of R410A refrigerant for any length over 15 feet.
• Charge by Sub-cooling.
Sub-cooling should be within the range as shown on the chart.
After adjusting charge, please allow at least 20 minutes for the
system to stabilize before making further charge adjustment.
Switch #
DS1
DS2
* DS2 switch 1 and 2 both must be turned on during normal operation mode.
F THE GAS SERVICE VALVE IS
CAUTION
,
OPEN THE SERVICE VALVES
1/8" .
FROM THE RETAINER
CAUTION
.
ATTENTION INSTALLER - IMPORTANT NOTICE!
Please read carefully before installing this unit.
Outdoor Unit Dipswitch Default Factory Settings
Setting
1 ON
2 ON
1 OFF
2 OFF
After the refrigerant charge has bled into the system, open
the liquid service valve. The service valve cap is the sec-
ondary seal for the valves and must be properly tightened to
prevent leaks. Make sure cap is clean and apply refrigerant
oil to threads and sealing surface on inside of cap. Tighten
cap finger-tight and then tighten additional 1/6 of a turn to
properly seat the sealing surfaces.
Do not introduce liquid refrigerant from the cylinder into
the crankcase of the compressor as this may damage
the compressor.
Break vacuum by fully opening liquid and gas base valve.
NOTE: Units may utilize ball valves or front seating valves
or front seating valves. It is not necessary to force the stem
tightly against the rolled lip.
NOTE: The following table lists the equivalent length gained
from adding bends to the suction line. Properly size the suction
line to minimize capacity loss.
Type of Elbow
Fitting
90° Short Radius
90° Long Radius
Or
Function
Communication Terminal Resister
Communication Terminal Resister
Cooling Emergency Mode*
Cooling Emergency Mode*
8
Inside Diameter (inches)
3/4
1.7
1.5
45° 0.7
2 T 11±1°F
3 T 14±1°F
4 T 9±1°F
5 T 12±1°F
7/8 1 1/8
2 2.3
1.7 1.6
0.8 1