14
AGZ 010B through 034B
IOMM AGZB1
Control Layout and Operation
Control Center
All electrical controls are enclosed in a weatherproof control center with tool-locked, hinged
access doors. The left-hand section contains the microprocessor controller and control input and
output terminals. All high-voltage components are located on the right side of the panel.
Start-up and Shutdown
Pre Start-up
1.
The chilled-water system should be flushed and cleaned. Proper water treatment is required
to prevent corrosion and organic growth.
2.
Open all electric disconnects and check all electric connections for tightness.
3.
Inspect all water piping for flow direction and correct connections at the evaporator.
4.
Verify thermostat water temperature sensor is installed in the leaving water line (supply to
building). On all AGZ units the sensor well and sensor are factory mounted.
5.
Check compressor oil level. The oil level should be visible in the oil sight glass.
6.
Check voltage of the unit power supply and make certain voltage is within
±
10% of
nameplate rating. Check unit power supply wiring for proper ampacity and a minimum
insulation temperature of 75
°
C. Check for proper phasing using a phase sequence meter.
7.
Verify all mechanical and electrical inspections have been completed according to local
codes.
8.
Open control stop switch S1(off). Turn on the main power and control disconnect switches.
This will energize crankcase heaters. Wait at least 24 hours before starting up unit.
9.
Open all water flow valves and start the chilled water pump. Check all piping for leaks and
vent the air from the evaporator as well as from the system piping. Flush the evaporator and
system piping to obtain clean, noncorrosive water in the evaporator.
Start-up
1.
Set temperature controller to the desired chilled water temperature. Set the chilled water
Delta-T.
MicroTech II
Controller
SpeedTrol Location
Field Connection
Terminals
Control
Transformer
24-Volt Trans.
Non-Fused Disc.
or
Power Block
Fan
Contactors
Fan
Protection
Compressor Contactors
ON/OFF Switch
Summary of Contents for AGZ 010BM
Page 67: ......
