Function/Description Of Major Control Board Components - Industrial Climate Engineering MiniPac ECUA06ACA A2 Series Operation And Installation Manual

Evaporator Blower and Motor (EBM)
• Twin blower and motor.
• Pulls cabinet air through evaporator and discharges cooled air back to cabinet.
• Squirrel cage blower design.
• Blower and motor combination must be replaced as complete unit.
• Shaded pole motor.
Resistance Heater (optional)
• Electric resistance heat to heat cabinet air.
• 1.0 kW @ 240 VAC.
• Located in supply air outlet.
• Nichrome wire.
• High limit thermostat (approximately 145°F) and thermal cut-out safety device.
1.3 Function/Description of Major Control Components
Control Voltage Transformer
• Provides low voltage to control circuits.
• Reduces line voltage (208/230 VAC) to 24 VAC.
• 40 VA power rating.
• Impedance protected.
• Factory wired for 230 VAC operation; if voltage is <220 VAC, wire for 208 VAC.
Compressor Contactor (CC)
• 24 VAC coil.
• Switches compressor and condenser.
• Energized during cooling mode.
Heat Contactor (optional)
• Double pole.
• 24 VAC coil.
• Energized during heating mode.
• Normally open (NO).
High Voltage Terminal Block
• Connection point for main incoming power.
• Two pole.
Ground Screw
• Grounding terminal for main power.
• Connected to high voltage receptacle on side of unit.
Low Voltage Terminal Block
• Connection point for low voltage controls.
• Thermostat, transformer, alarm.
• 10 terminals.
Compressor Capacitor
• Start/run capacitor for PSC (permanent split capacitor) compressor motor.
• 15 µfd, 370 VAC.
• Provides starting torque and improves operating efficiency.
6 ECUA06 7/2014 new