NorAire EB-HPH Series, Инструкция по установке и эксплуатации

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09/06/2018 31 BI903
LCD Display Lines 2 & 3, TEMPERATURES
ST
ST is short for “Supply Sensor Temperature”. This is the temperature of the water as
it leaves the NorAire unit. If the ST sensor is not working, the LCD will display
“BAD” after the ST on the LCD display.
OT
OT is short for “Outdoor Sensor Temperature”. This is the outdoor temperature. If
the OT sensor is not working, the LCD will display “BAD” after the OT on the LCD
display. With a faulty OT sensor, the ODU is disabled and the “Heat Source Below
Lockout” is used.
RT
RT is short for “Return Sensor Temperature”. This is the temperature of the water as
it enters the NorAire unit. If the RT sensor is not working, the LCD will display
“BAD” after the RT on the LCD display. With a faulty RT sensor, the ODU is
disabled and the “Heat Source Below Lockout” is used.
DT
DT is short for “Desired Temperature”. This is applicable only when the electric
boiler is enabled. In BOOST mode or EL BOILER ONLY mode. DT is the desired
water temperature leaving the NorAire unit.
LCD Display Lines 4, VARIOUS INFORMATION
BOOST IN
This is a countdown timer used only with NorAire mode. When this countdown
timer expires, the NorAire will transition from “HP ONLY” mode to “BOOST”
mode.
FAULTS
System faults are communicated via line 4 of the LCD display. The below is a
run through of the 5 possible faults.
HIGH PRESSURE
There is a mechanical high pressure switch located in the IDU. This is 500psi. If
this high pressure switch opens while the heat pump is active, you will see the
heat pump shut down (if in BOOST, Electro-Boiler will shut down also) and a
10 minute ACD will start. The heat pump (and electric boiler if was in BOOST)
will be reactivated upon the expiration of this 10 minute ACD (provided the high
pressure switch has closed).
RT TOO HIGH
This is a software monitor of the return water temperature sensor. If the RT
sensor is reading a value > the RT TOO HIGH setting (factory default 110°F),
the heat pump (and boiler if in BOOST mode) will be shut down and a 10 minute
ACD will start. The heat pump (and electric boiler if was in BOOST) will be
reactivated upon the expiration of this 10 minute ACD AND the RT is 5° < the
RT TOO HIGH value. The RT TOO HIGH value is adjustable via the display.
LOSS OF FLOW
This is an indication that the field provided flow switch (if added) has opened or
has failed to close for some reason. If the LOSS OF FLOW fault is active, the
current heat source being used (heat pump, Electro-Boiler, or gas boiler) will be
shut down and a 10 minute ACD will start. The heating source being called upon
at the time will be reactivated upon the expiration of this 10 minute ACD
(provided the flow switch has closed).
BOILER HL
This is an indication that the factory provided Electric boiler high limit has
opened for some reason. Usually due to lack of flow (GPM) through the
NorAire system.
RT TOO LOW
This is a software monitor of the return water temperature sensor. If the RT
sensor is reading a value < the RT TOO LOW setting (factory default 50°F), the
heat pump will shut down and the electric boiler will be activated until the RT is
20° > than the RT TOO LOW setting. Once this condition is met, the NorAire
will shift into boost mode. The RT TOO LOW value is adjustable via the
product display.