Electrical Connections - Daikin DZ18VC Series Installation Instructions Manual

Start-up Procedure Detail
Liquid and gas valves on heat pump unit are closed to contain
the charge within the unit. The unit is shipped with the valve
stems closed and caps installed. Do not open valves until
the indoor coil and line set is evacuated.
P
ROLONGED OPERATION AT SUCTION PRESSURES LESS THAN
5
FOR MORE THAN SECONDS WILL RESULT IN OVERHEATING OF THE
COMPRESSOR AND MAY CAUSE PERMANENT DAMAGE TO IT
1. Connect the vacuum pump with 250 micron capability
to the service valves.
2. Evacuate the system to 250 microns or less using
gas and liquid service valves. Using both valves is
necessary as some compressors create a mechanical
seal separating the sides of the system.
3. Close pump valve and hold vacuum for 10 minutes.
Typically pressure will rise during this period.
• If the pressure rises to 1000 microns or less and
remains steady the system is considered leak-free;
proceed to start-up.
• If pressure rises above 1000 microns but holds
steady below 2000 microns, moisture and/or
noncondensibles may be present or the system may
have a small leak. Return to step 2: If the same
result is encountered check for leaks as previously
indicated and repair as necessary then repeat
evacuation.
• If pressure rises above 2000 microns, a leak is
present. Check for leaks as previously indicated and
repair as necessary then repeat evacuation.
5000
4500
4000
3500
3000
2500
2000
1500
1000
500
0 1 2
CAUTION
20
.
LEAK(S)
PRESENT
CONDENSIBLES OR SMALL
LEAK PRESENT
NO LEAKS
NO CONDENSIBLES
3 4 5 6 7 8 9
MINUTES

Electrical Connections

HIGH VOLTAGE!
D
ISCONNECT
M
ULTIPLE POWER SOURCES MAY BE PRESENT
TO DO SO MAY CAUSE PROPERTY DAMAGE
PSIG
INJURY OR DEATH DUE TO ELECTRIC SHOCK
MUST CONFORM WITH
. U
CODES NDERSIZED WIRES COULD CAUSE POOR
EQUIPMENT PERFORMANCE
.
FIRE
T
O AVOID THE RISK OF FIRE OR EQUIPMENT DAMAGE
CONDUCTORS
GROUNDING REQUIRED!
A
LWAYS INSPECT AND USE PROPER SERVICE TOOLS
INSPECTION OR IMPROPER TOOLS MAY CAUSE EQUIPMENT DAMAGE OR
PERSONAL INJURY
RECONNECTED BEFORE INSTALLING OR SERVICING
COMPONENTS OF THIS UNIT MAY CONDUCT ELECTRICAL CURRENT
THESE ARE GROUNDED
OF GROUNDING WIRES
USED TO COMPLETE THE GROUND
ORIGINAL POSITION AND PROPERLY FASTENED
The heat pump unit rating plate lists pertinent electrical data
necessary for proper electrical service and overcurrent protec-
tion. Wires should be sized to limit voltage drop to 2% (max.)
from the main breaker or fuse panel to the condensing unit.
Consult the NEC, CEC, and all local codes to determine the
correct wire gauge and length.
Local codes often require a disconnect switch located near
the unit; do not install the switch on the unit. Refer to the
installation instructions supplied with the indoor air handler
for specific wiring connections and indoor unit configuration.
Overcurrent Protection
The inverter control system software provides sufficient time
delay to protect from overcurrent conditions and permit the
compressor to adjust their rotational speed.
High Voltage Connections
Route power supply and ground wires through the high volt-
age port and terminate in accordance with the wiring diagram
10
provided inside the control panel cover.
Low Voltage Connections
The unit is designed to work as part of a fully communicating
HVAC system, utilizing a Daikin approved communicating
thermostat, communicating indoor unit, and up to four wires.
Route control wires through the low voltage port and termi-
nate in accordance with the wiring diagram provided inside
the control panel cover.
6
WARNING
ALL
POWER BEFORE SERVICING
,
PERSONAL
. W
NEC CEC
OR AND ALL LOCAL
,
EQUIPMENT DAMAGE OR
WARNING
.
CAUTION
. A
LL DISCONNECTED GROUNDING DEVICES
. I
F SERVICING THE UNIT
, , ,
SCREWS STRAPS CLIPS
MUST
BE RETURNED TO THEIR
.
. F
AILURE
IRING
,
USE COPPER
. L
ACK OF
MUST
BE
. M
ULTIPLE
;
,
ANY DISCONNECTION
,
NUTS OR WASHERS
.