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Electrical System Installation
Due to our policy of continuous product innovation, some specifications may change without notification.
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Power Supply / Power Wiring Specifications
1. Water source unit (WSU) and indoor units (IDU) must obtain power from separate breakers:
• Water source unit: 3 phase, 3 wire, 60Hz, 208-230V or 460V
• Indoor units: single phase, 60 Hz, 208-230V (Indoor units draw minimal power. Where permitted by NEC and local code, it may be
prudent to connect multiple indoor units to a properly sized breaker.)
2. Select power supply wire type and size based on NEC and local codes. Maximum allowable voltage fluctuation is ±10% of unit
nameplate rated value.
3. Properly ground the water source unit and indoor units per NEC and local code.
ELECTRICAL SYSTEM INSTALLATION
Power Wiring
Figure 70: Typical Power Wiring.
Ring Terminal
Connecting the Power Wiring
• WSU input power is capable of causing severe injury or death. Do not
touch bare input power wire or terminals. Ensure input power is OFF
before connecting power wiring to the WSU.
• If power wires are not properly terminated and firmly attached, there is
risk of fire, electric shock, and physical injury or death.
• Refer to the installation manual for each model of IDU for details of
connecting power to each model of IDU.
Best practice is to use ring or spade terminals to terminate power wiring at
the power terminal block. If ring terminals or spade clips are not available,
terminate the wires as follows:
• Firmly attach the wire; secure in a way to prevent external forces
from being imparted on the terminal block.
• Use an appropriately sized screwdriver for tightening the terminals.
• Do not overtighten the connections; overtightening may
damage the terminals.
Figure 71:Typical Ring Terminal.
Power Supply
3 Phase 3 Wire
60Hz 208/230V
or 60Hz 460V
Single Phase Power Wiring
Breaker or Fused
Disconnect Switch
Main Switch
Pull Box (Installer Option)
Single Phase
208-230V, 60Hz
Power Supply
Breaker or Fused
Disconnect Switch
Three Phase Power Wiring
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