CAUSE
- Low ambient conditions
- Incorrect voltage
- Incorrect t-stat setting
- Poor location of t-stat
- Undersized electric coil
- Improper wiring size supplied to unit
- Improper Resistance or no continuity across electric coil
SOLUTION
- Confirm temperature rise with submittal backpage
- Apply proper voltage to the unit per unit requirement (see unit label)
- Set t-stat to the proper setting
- Relocate t-stat to proper location away from discharge nozzle to sense the average room temperature
- Replace higher kw electric coil (check power requirements first)
- Check NEC code and replace wiring with proper wiring size
- Replace electric coil
Air Curtain FAQ & Troubleshooting Guide
Troubleshooting Guide
Electric Heated Models
Low Heat
Extreme Heat
CAUSE
- Incorrect supply voltage
- Electric coils touching each other
- Deficient airflow across coil
- Improper t-stat setting
- Poor location of t-stat
- Airflow adjustment set too low
SOLUTION
- Supply proper voltage
- Spread electric coils apart
- Clear coil of restriction
- Adjust t-stat to proper setting
- Relocate stat to proper location closer to the discharge nozzle
- Adjust the adjustable speed control knob to a higher airflow
Steam/Hot Water Heated Models
Extreme Heat
CAUSE
- Low air flow across coil
- Dirty coil / fins clogged
- Water Flow Rate/ Steam Pressure too high
SOLUTION
- Speed up fan or check wheel rotation
- Clean / remove dirt from coils
- Reduce steam pressure or water flow rate / pressure
Low Heat
CAUSE
- Low ambient conditions
- Insufficient steam pressure / water flow
- Inadequate condensation relief (steam coil models only)
- Coil leaking
SOLUTION
- Check temperature rise with submittal back page
- Increase steam pressure / water flow to coil as required
- Increase coil trap diameter
- Repair or replace coil
No Heat
CAUSE
- Defective solenoid valve
- Inadequate water / steam pressure
- Fan Inoperable
- Door switch inoperable
SOLUTION
- Replace solenoid valve
- Increase steam / water flow
- Check fan operation (see "No Air Blowing Out Of Discharge Nozzle")
- Check door limit switch function or replace door limit switch
Control Panel - Unheated and Hot Water/Steam Heated Models
Unit Inoperable
CAUSE
- No Power being supplied to panel
- Circuit breaker is tripped
- HOA is in the "O" or Off position
- Contactor not energizing
- Contactor not energizing
- Contactor not energizing
SOLUTION
- Apply Power supply
- Flip circuit breaker to on positition
- Turn HOA switch on panel to "H" or ON position
- Turn HOA switch on panel to "A" or AUTO position when utilizing a switch to automatically turn the air curtain on when the door opens.
- Check fuses or replace fuses
- Push red button on Overload/Motor Protector to reset
- Check transformer or replace transformer
Overload (OL)/Motor Protector(MP) Tripping
CAUSE
- Amperage setting(s) too low on OL/MP during operation
- All motors are wired to one set of motor terminals and use only one OL/MP for overcurrent protection
SOLUTION
- Set the adjustable amperage dial to slightly above the actual running amperage for the unit. Having lower or higher actual voltage will affect the running amperage and may fall beyond the standard range for the panel.
- Be ceratin that each motor is wired to separate terminals and do not share a common overload. For example: for a 2 motor unit; terminals 11, 21, 31 are for motor 1 and terminals 12, 22, 32 are for motor 2.
Low Air Flow
CAUSE
- Power leads out of polarity
- Blower motor rotating below normal speed
SOLUTION
- Switch power leads to correct polarity
- Apply proper voltage per unit requirement (see unit label) / Adjust adjustable motor speed knob (if applicable)
Control Panel - Electric Heated Models
Unit Inoperable
CAUSE
- No Power being supplied to panel
- Circuit breaker is tripped
- On/Off switch is in the Off position
- Contactor not energizing
- Contactor not energizing
SOLUTION
- Apply Power supply
- Flip circuit breaker to on positition
- Flip the switch on panel to ON or up position
- Turn HOA switch on panel to "A" or AUTO position when utilizing a switch to automatically turn the air curtain on when the door opens.
- Check fuses or replace fuses
- Check transformer or replace transformer
Low Air Flow
CAUSE
- Power leads out of polarity
- Blower motor rotating below normal speed
SOLUTION
- Switch power leads to correct polarity (3 phase models only)
- Apply proper voltage per unit requirement (see unit label) / Adjust adjustable motor speed knob (if applicable)
