Daikin WGZ030DW Installation And Maintenance Manual page 54

Start-Up and Shutdown
Start-up after Temporary Shutdown
Start the water pumps.
1
With the control system switch S1 in the "on" position,
2
move the pumpdown switches PS1 and PS2 to the "auto
pumpdown" position.
Observe the unit operation for a short time, noting
3
unusual sounds or possible cycling of compressors.
Check compressor crankcase heaters.
4
Extended Shutdown
Close the manual liquid line shutoff valves.
1
After the compressors have pumped down, turn off the
2
water pumps.
Turn off all power to the unit.
3
Move the control service switch S1 to the "off" position.
4
Close the discharge shutoff valves on the compressor(s)
5
and the liquid outlet valves at the condenser.
Tag all opened disconnect switches to warn against start-
6
up before opening the compressor suction and discharge
valves.
Drain all water from the unit evaporator, condenser, and
7
chilled water piping if the unit is to be shut down during
the winter and exposed to below freezing temperatures.
Do not leave the vessels or piping open to the
atmosphere over the shutdown period.
Start-up after Extended Shutdown
Inspect all equipment to see that it is in satisfactory
1
operating condition.
Remove all debris that has collected on the surface of the
2
condenser coils (remote condenser models) or check the
cooling tower, if present.
Open the compressor discharge valves until backseated.
3
Always replace valve seal caps.
54
Open the manual liquid line shutoff valves.
4
Check circuit breakers. They must be in the "off"
5
position.
Check to see that the pumpdown switches PS1 and PS2
6
are in the "manual shutdown" position and the control
system switch S1 is in the "off" position.
Put the main power and control circuit disconnects to the
7
"on" position.
Allow the crankcase heaters to operate for at least 12
8
hours prior to start-up.
Start the chilled water pump and purge the water piping
9
as well as the evaporator in the unit.
Start the system auxiliary equipment for the installation
10
by turning on the time clock, ambient thermostat and/or
remote on/off switch.
Check that the MicroTech II controller is set to the
11
desired chilled water temperature.
Check resets of all equipment protection controls.
12
Switch the unit circuit breakers to "on."
13
Start the system by setting the system switch S1 to "on."
14
Most relays and terminals in the control center are powered when S1
is closed and the control circuit disconnect is on. Therefore, do not
close S1 until ready for start-up or serious equipment damage can
Set pumpdown switches PS1 and PS2 to the "auto
15
pumpdown" position for restart and normal operation.
After running the unit for a short time, check the oil level
16
in the compressor oil sight glass or in the compressor's
equalizing lines for flashing indicating possible
refrigerant in the oil (see
beginning on page 55).
CAUTION
occur.
System Maintenance section
IM 1131-2