IOMM ACZ1 ACZ 010A through 039A
13
Control Layout and Operation
Control Center
All electrical controls are enclosed in a weather resistant 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 or air filters checked for cleanliness on
DX systems.
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 or ductwork
for tightness and completeness.
4.
Verify that thermostat connections for two stages of control have been connected to unit terminals
23 / J5-ID7 and 28 / J5- ID-8.
5.
Check compressor oil level. The oil level should be visible in the oil sightglass.
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.
Start-up
1.
Start auxiliary equipment by turning on the following: time clock (if present), ambient thermostat
and/or remote on/off switch, chilled water pump or air handler.
2.
If the field supplied staging control calls for cooling, the unit will begin the start-up sequence.
3.
After running the unit for a short time, check the oil level in the compressor (1/4 to 1/3 of the
glass), rotation of fans, and flashing in refrigerant sightglass.
4.
Verify superheat temperature is at the factory setting of 8 to 12 degrees F (4.4 to 6.7 degrees C).
5.
After system performance has stabilized, complete the current ACZ Start-Up Form (obtainable
from the local McQuay sales office) to establish inception of warranty benefits. Return the form
to McQuay International through your sales representative.
MicroTech II
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
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