57
Eubank Wall Mount Heat Pump I&O Manual
05/2023 Rev.2
Cooling Start
If using a standard thermostat, Set the Control to ON, Mode to Cooling, Fan to Auto (other controls,
set appropriately for cooling mode).
Note: The reversing valve (Eubank Heat Pumps) is energized for
“Cooling”. The “O” signal from the thermostat is Required.
Adjust the cooling setpoint to approximately four degrees below the current indoor temperature. After
the initial start-up delay (.3 to 5 minutes), the unit will sequence on, start cooling.
Is the indoor blower motor (IBM) On? (if IBM fails to come on, Check Phase Monitor)
❒
Yes
❒
No
Is the Compressor On? (if Compressor fails to come on, Check Phase Monitor) .............
❒
Yes
❒
No
Is the Condenser Fan (CFM) On? (Ambient conditions may be delay CFM) ...................
❒
Yes
❒
No
Is incoming power properly Phased? (YES! If “Green LED” on Phase Monitor is On.) ..
❒
Yes
❒
No
If incoming power is Not properly phased, “Red LED on Phase Monitor will be on; swap any two
incoming power wires, either at the distribution panel or at the incoming power terminal block. Never
rewire power wiring internal to the control box.
RECHECK Incoming Power and Voltage Balance in Cooling Mode.
Measured Line to Line Volts L1&L2 _______V., L1&L3 ________V., L2&L3 ______V.
Is incoming voltage between Min and Max voltage listed on unit Data Label? ..............
❒
Yes
❒
No
An incoming voltage that is Not between the Minimum and Maximum listed on the unit Data Label
Must be addressed and corrected before starting unit. Improper voltage can cause the compressor to
overheat and cause premature failure.
Measured Line to Line Balance
Is incoming voltage properly balanced? (use formula below to calculate balance) .........
❒
Yes
❒
No
Average Voltage =
(L1&L2 + L1&L3 + L2&L3)/3 =
__________ V.
Deviation Difference = Average Voltage - Maximum Deviation =
__________ V.
Voltage Imbalance =
(Deviation Difference x 100)/ Average Voltage = __________ %
A Voltage Imbalance greater than 2% with the unit running Must be addressed and corrected. Excess
Line to Line Voltage Imbalance can cause the compressor to overheat and cause premature failure.
Example:
Voltage Imbalance = (Average Voltage – Maximum Deviation) x 100
Average Voltage
Measured Voltages:
L1 & L2 = 241 Volts
L1 & L3 = 243 Volts
L2 & L3 = 235 Volts
719 / 3 = 239.7 Volts (Average Voltage)
239.7 (Average Voltage) – 235 (Maximum Deviation) = 4.7 (Deviation Difference)
(4.7 x 100)/239.7 = 1.95% Voltage Imbalance (
Less than 2% is acceptable
)
