Reznor JS4BD (3ph) Unit Installation Manual - Manual (Page 6)

6
example :
AB = 226V
BC = 230V
AC = 227V
2. Determine the average voltage in the power supply.
3. Determine the maximum deviation:
4. Determine percent of
voltage imbalance by
using the results from
steps 2 & 3 in the following
equation.
2
228
100 x = 0.88%
Example:
1. Measure the line voltages
of your 3 phase power
supply where it enters the
building and at a location
that will only be dedicated
to the unit installation (at
the units circuit protection
or disconnect).
unbalanced 3-phase Supply Voltage
Voltage unbalance occurs when the voltages of all phases
of a 3-phase power supply are no longer equal. This
unbalance reduces motor efficiency and performance.
Some underlying causes of voltage unbalance may include:
Lack of symmetry in transmission lines, large single-phase
loads, and unbalanced or overloaded transformers. A
motor should never be operated when a phase imbalance
in supply is greater than 2%.
Perform the following steps to determine the percentage
of voltage imbalance:
In this example, the measured line voltages were
226, 230, and 227. The average would be 228 volts
(226 + 230 + 227 = 683 / 3 = 228).
The amount of phase imbalance (0.88%) is satisfactory
since the amount is lower than the maximum allowable
2%. Please contact your local electric utility company if
your voltage imbalance is more than 2%.
example:
From the values given in step 1, the BC voltage
(230V) is the greatest difference in value from
the average:
230 - 228 = 2
228 - 226 = 2
228 - 227 = 1 Highest Value
max voltage deviation
from average voltage
= 100 x
average voltage
% Voltage Imbalance
air conditioner maintenance
Warning:
to prevent electrical shock, personal injury, or
death, disconnect all electrical power to the unit
before performing any maintenance or service.
the unit may have more than one electrical
supply.
Proper maintenance is important to achieve optimum
performance from the air conditioner. The ability to properly
perform maintenance on this equipment requires certain
mechanical skills and tools. If you do not possess these
skills, contact your dealer for maintenance. Consult your
local dealer about the availability of maintenance contracts.
Routine maintenance should include the following:
• Inspect and clean or replace air filters at the beginning
of each heating and cooling season, or more frequently
if required.
• Inspect the condensate drain and outdoor coil at the
beginning of each cooling season. Remove any debris.
Clean the outdoor coil and louvers as necessary using
a mild detergent and water. Rinse thoroughly with water.
• Inspect the electrical connections for tightness at the
beginning of each heating and cooling season. Service
as necessary.
caution:
the unit should never be operated without a
filter in the return air system. replace disposable
filters with the same type and size.
• Do not attempt to add additional oil to motors un -
equipped with oil tubes. The compressor is hermetically
sealed at the factory and does not require lubrication.