Engineered air EngA CU Series, Инструкция по установке, эксплуатации и обслуживанию

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A
CU MANUAL
IOM-14 29 of 46 Feb 06 R4
1) The field wiring load depends on the actual load on a particular control circuit the field wiring is
connected to. Refer to the internal wiring diagram of the unit.
2) The table above is based on a maximum 10% voltage drop on a 24V control circuit. Wire size was
calculated using the following formula:
CM = (25 x I x L ) / V
Where CM is circular mils of conductor for a constant load of I amps, wire length L in feet from the
unit to the field device and back, and voltage drop V .
When connecting to a three phase power supply, check for the correct rotation of all motors and fans. All
electrical conduit outlets in the control panel must be sealed to prevent moist building air from migrating
to the control panel.
BEFORE START-UP
Remove tie-down bolts, straps and blocks on fan and compressor vibration isolators, tilt equipped heat
pipes and enthalpy/desiccant wheels if supplied.
START-UP CHECK LIST
Warning: This unit is connected to high voltages. Electrical shock or death could occur if
instructions are not followed. This equipment contains moving parts that can start
unexpectedly. Injury or death could occur if instructions are not followed. All work
should be performed by a qualified technician. Always disconnect and lock out power
before servicing. DO NOT bypass any interlock or safety switches under any
circumstances.
The start-up and operation must be in accordance with safe practices. Start-up must be performed by
qualified personnel. Complete attached start-up record.
1.
Set all associated electrical switches, controls, thermostats and main disconnect switch to “OFF”
position.
2.
Close all manual valves and field piping valves.
3.
Before startup, review the Unit Function (mounted on the control panel door) and all control
manuals supplied with this equipment. On units with heating sections, please follow the start-up
procedure in the heating manuals. (Pack, DJ, DG, RT, HE, LM-K etc.)
4.
Confirm all shipping materials has been removed. On units with semi-hermetic compressors,
remove four spring isolator spacers and back off the top nut so that there is 1/32" (0.8mm) to
1/16" (1.6mm) space between the nut and neoprene spacer.
5. Check all bearings, drive and fan set screws for tightness.