21
VersiVent Energy Recovery Ventilator
Start-Up Unit
DANGER
Electric shock hazard. Can cause injury or death.
Before attempting to perform any service or
maintenance, turn the electrical power to unit to OFF
at disconnect switch(es). Unit may have multiple
power supplies.
CAUTION
Use caution when removing access panels or other
unit components, especially while standing on a
ladder or other potentially unsteady base. Access
panels and unit components can be heavy and
serious injury may occur.
CAUTION
Do not operate without the filters and birdscreen
installed. They prevent the entry of foreign objects
such as leaves, birds, etc.
CAUTION
Do not run unit during construction phase. Damage to
internal components may result and void warranty.
WARNING
• Unit was factory tested. All blowers, fans, and
compressors are set-up to run correctly when
supplied power. If any one fan is running backwards
or the compressor is making loud noises,
immediately turn off the power. Switch two leads
on the incoming power to the disconnect. This
will ensure proper operation of the unit. Failure to
comply may damage the compressors and void the
warranty.
• Do not jumper any safety devices when operating
the unit. This may damage components within or
cause serious injury or death.
• Do not operate compressor when the outdoor
temperature is below 40
°
F.
• Do not short-cycle the compressor. Allow 5 minutes
between “on” cycles to prevent compressor
damage.
• Prior to starting up the unit, power must be
energized for 24 hours without a call for cooling to
allow the compressor crankcase heaters time to boil
off any liquid refrigerant present in the compressor.
• DX system is charged with refrigerant. Start-up must
be performed by EPA Certified Technician.
SPECIAL TOOLS REQUIRED
• Voltage Meter (with wire probes)
• Amperage Meter
• Pressure Gauges – (refrigerant)
• Tachometer
• Thermometer
• U-tube manometer or equivalent
Start-Up Procedure
The unit will be in operational mode during start-up. Use
necessary precautions to avoid injury. All data must be
collected while the unit is running. In order to measure
volts and amps, the control center door needs to be
open and the unit energized.
• Make sure Pre-Start-Up checklist is complete.
• Jumper R to G to enable unit. Jumper R to Y1 and R
to Y2 to enable cooling and R to W1 to enable heat
for units without microprocessor.
• Turn the disconnect on. After 3 minutes,
compressors will come on. Make sure all fans and
compressors are rotating the correct direction.
• Allow the unit to run until the refrigerant system
stabilizes. Approximately 10-15 minutes.
Voltage Imbalance
In a three-phase system, excessive voltage imbalance
between phases will cause motors to overheat and
eventually fail. Maximum allowable imbalance is 2%.
To determine voltage imbalance, use recorded voltage
measurements in this formula.
Key:
V1, V2, V3 = line voltages as measured
VA (average) = (V1 + V2 + V3) / 3
VD = Line voltage (V1, V2 or V3) that
deviates farthest from average (VA)
Formula: % Voltage Imbalance = [100 x (VA-VD)] /VA
