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2. PRE-OPERATION PROCEDURES
Installation Precautions & Procedures
11. Triple phase power cable MUST be connected properly.
DE/DT models are designed to operate in triple phase at 220V AC. Determine phasing capability
of facility power supply (single phase vs. triple phase) before attempting to connect power cable.
Power connections for these units require specialized knowledge and skill. Contact Yamato
dealer or a certified electrician about performing necessary electrical work and power cable
connections. Electrical work and connections performed by anyone other than a qualified
technician may result in malfunction, fire or electric shock.
Core color
Wiring on the
distribution board
Red
Phase R
White
Phase S
Black
Phase T
Green
Earth
If three-phase (R, S, T) connection is configured incorrectly,
“fan error” will be displayed when
unit is powered on and fan motor will not rotate. In this event, change any two of the three wires.
Error will clear and fan motor will operate normally.
Confirm that differential pressure gauge indicator is beyond the halfway point and in the green
zone.
12. Handle power cable with care.
Never operate unit with power cable bundled or tangled; and do not modifiy, bend, forcibly twist
or pull on power cable. Doing so may cause fire and/or electrical shock.
Do not risk damage to power cable by positioning it under desks or chairs, or by allowing it to be
pinched in between objects. Doing so may cause fire and/or electrical shock.
Do not place power cable near kerosene/electric heaters or other heat-generating devices.
Doing so may cause power cable insulation to overheat, be damaged and/or catch fire, which
may result in electric shock.
Turn off main power switch (ELB) immediately and disconnect from facility terminal or outlet, if
power cable becomes partially severed or damaged in any way. Failure to do so may result in
fire or electric shock. Contact a local dealer or Yamato sales office for assistance in replacing
power cable if it is damaged.
Always connect power cable to appropriate facility outlet or terminal.
13. Ground wire MUST be connected.
・
Grounding to Electrical Equipment Technical Standards, Section 19, class D (Grounding
Resistance Max.
100Ω) is required in Japan when no grounding terminal is provided.
Contact a local dealer, electrician, or Yamato Sales office for location-specific electrical
requirements.
・
Connect terminals securely to facility terminal or to an appropriate connector.
・
Plugs and connectors are not included with this unit. Ground unit properly to facility outlet or
terminal as required.
Core color
Facility
Red
Phase R
White
Phase S
Black
Phase T
Green
Earth
Never connect ground wire to gas lines, water pipes, telephone grounding lines or lightning
rods. Doing so may result in fire or electrical shock.
Earth
Ground