Low Voltage Connections; System Start-Up - Daikin CONDENSING UNIT Installation Instructions Manual

Low Voltage Connections

Condensing unit control wiring requires 24 Volt minimum, 25VA
service from the indoor transformer. Low voltage wiring for two-
stage units depends on the thermostat used and the number of
control wires between the indoor unit and the condensing unit.
Route control wires through the low voltage port and terminate in
accordance with the wiring diagram provided inside the control
panel cover.
Single-Stage Thermostat
with Two Low Voltage Wires to Remote
System Start Up
POSSIBLE REFRIGERANT LEAK
To avoid a possible refrigerant leak, open the service valves until
the top of the stem is 1/8" from the retainer.
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.
NOTE: These are not back-seating valves. It is not necessary to
force the stem tightly against the rolled lip.
NOTE: Power must be supplied to the 18 SEER outdoor units
containing ECM motors before the power is applied to the
indoor unit. Sending a low voltage signal without high voltage
power present at the outdoor unit can cause malfunction of
the control module on the ECM motor.
Adequate refrigerant charge for the matching HSVTC evaporator
coil and 15 feet of lineset is supplied with the condensing unit. If
using evaporator coils other than HSVTC coil, it may be necessary
to add or remove refrigerant to attain proper charge. If line set
exceeds 15 feet in length, refrigerant should be added at .6 ounces
per foot of liquid line.
NOTE: Charge should always be checked using superheat when
using a piston and subcooling when using TXV equipped indoor
coil to verify proper charge.
THERMOSTAT
SINGLE-STAGE HEATING
WITH
SINGLE-STAGE COOLING
CAUTION
Open the suction service valve first! If the liquid service valve is
opened first, oil from the compressor may be drawn into the
indoor coil TXV, restricting refrigerant flow and affecting opera-
tion of the system.
After the refrigerant charge has bled into the system, open the
liquid service valve. The service valve cap is the secondary 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 (1 wrench flat), or to the following
specification, to properly seat the sealing surfaces.
1. 3/8" valve to 5 - 10 in-lbs
2. 5/8" valve to 5 - 20 in-lbs
3. 3/4" valve to 5 - 20 in-lbs
4. 7/8" valve to 5 - 20 in-lbs
Do not introduce liquid refrigerant from the cylinder into the
crankcase of the compressor as this may damage the compressor.
POSSIBLE REFRIGERANT LEAK
To avoid a possible refrigerant leak, open the service valves until
the top of the stem is 1/8" from the retainer.
1. Break vacuum by fully opening liquid and suction base
valves.
2. Set thermostat to call for cooling. Check indoor and outdoor
fan operation and allow system to stabilize for 10 minutes
for fixed orifices and 20 minutes for expansion valves.
Charge Verification
Violation of EPA regulations may result in fines or other penalties.
Operating the compressor with the suction valve closed will void
the warranty and cause serious compressor damage.
6
CAUTION
CAUTION
NOTICE
CAUTION