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7 SERIES 700A11 INSTALLATION MANUAL
Aurora Control System
NOTE:
Refer to the Aurora Base Control Application and
Troubleshooting Guide and the Instruction Guide: Aurora
Interface and Diagnostics (AID) Tool for additional information.
To check the unit control board for proper operation:
1. General
Check
• If any new device was installed, or any wiring
was changed, check the connections to ensure
the wiring is correct, and all the wires are in
good condition.
• Verify all the plugs are securely connected and in
good condition.
• Check the DIP switch (SW2) positions are correct.
• Measure 24 VAC between R and C. (The actual
reading may be from 18 to 30 VAC). Check the
incoming power and the power transformer if
the R and C voltage reading is not correct.
2.
No LEDs are On
• Check 24 VAC on board.
• Check the 3 amp fuse. Replace the fuse if needed.
• Verify transformer circuit breaker has not tripped
if no low voltage is present.
• Disconnect the thermostat connection P1.
• Replace the Aurora base control board.
Troubleshooting
HE
gpm x 500
Reference Calculations
Heating Calculations:
Cooling Calculations:
LWT = EWT +
LAT (DB) = EAT (DB) -
LC = TC - SC
S/T =
HR
gpm x 500
SC
cfm x 1.08
SC
TC
LWT = EWT -
LAT = EAT +
TH = HC + HW
HC
cfm x 1.08
Legend
Abbreviations and Definitions
cfm
= airflow, cubic feet/minute
EWT = entering water temperature, Fahrenheit
gpm = water flow in gallons/minute
WPD = water pressure drop, psi and feet of water
EAT = entering air temperature, Fahrenheit (dry bulb/wet bulb)
HC
= air heating capacity, MBtu/h
TC
= total cooling capacity, MBtu/h
SC
= sensible cooling capacity, MBtu/h
kW
= total power unit input, kilowatts
HR
= total heat of rejection, MBtu/h
HE
= total heat of extraction, MBtu/h
HWC = hot water generator capacity, MBtu/h
EER = Energy Efficient Ratio
= Btu output/Watt input
COP = Coefficient of Performance
= Btu output/Btu input
LWT = leaving water temperature, °F
LAT
= leaving air temperature, °F
TH
= total heating capacity, MBtu/h
LC
= latent cooling capacity, MBtu/h
S/T
= sensible to total cooling ratio
Refrigerant Systems
Refrigerant pressures are monitored by the control
system; to maintain sealed circuit integrity, do not install
service gauges unless pressure sensor is suspected to be
inoperative. Compare the change in temperature on the
air side as well as the water side to the Unit Operating
Parameters tables. If the unit’s performance is not within
the ranges listed, make sure the airflow and water flow are
correct. Check superheat and subcooling with an AID Tool. If
superheat and subcooling are outside recommended ranges,
an adjustment to the refrigerant charge may be necessary.
NOTE:
Refrigerant tests must be made with hot water
generator turned “OFF”. Verify that air and water flow rates
are at proper levels before servicing the refrigerant circuit.
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