66
AGZ 025D through 190D
OMM 1087-1
Startup
Pre Start-up
The chiller must be inspected to ensure no components became loose or damaged during shipping or
installation.
Start-Up
Refer to the MicroTech III Controller section beginning on page 13 to become familiar with its
operation before starting chiller.
There should be adequate building load (at least 50 percent of the unit full load capacity) to properly
check the operation of the chiller refrigerant circuits.
Be prepared to record all operating parameters required by the “Compressorized Equipment Warranty
Form”. Return this information within 10 working days to McQuay International as instructed on the
form to obtain full warranty benefits.
1.
Verify chilled water flow.
2.
Verify remote start / stop or time clock has requested the chiller to start.
3.
Set the chilled water setpoint to the required temperature. (The system water temperature must be
greater than the total of the leaving water temperature setpoint plus one-half the control band
before the MicroTech III controller will stage on cooling).
4.
Set the Evap Delta T and the Start Delta T as a starting point.
5.
Put both pumpdown switches (PS1 and PS2) to the ON position.
6.
Put system switch (S1) to ON position.
Switch
Switch Position
ON
OFF
PS1, PS2,
Pumpdown
Switches
Circuits will operate in the
normal automatic mode
Circuit will go through the
normal pumpdown cycle and
shut off
S1,
System Switch
Unit will operate in the
normal automatic mode
Unit will shut off immediately
without pumping down
(emergency stop)
7.
After the chiller has been operating for a period of time and has become stable, check the
following:
•
Compressor oil level. (Some scroll compressors do not have oil sight glasses).
•
Refrigerant sight glass for flashing
•
Rotation of condenser fans
•
Complete the “Compressorized Equipment Warranty Form.”
Shutdown
Temporary
1.
Put both circuit switches (PS1 and PS2) to the OFF position (Pumpdown and Stop).
2.
After compressors have stopped, put System Switch (SW1) to OFF (emergency stop).
3.
Turn off chilled water pump. Chilled water pump to operate while compressors are pumping
down.
To start the chiller after a temporary shutdown, follow the start-up instructions.
Summary of Contents for AGZ-D 25
Page 12: ...12 AGZ 025D through 190D OMM 1087 1 Figure 2 Typical Field Control Wiring...
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