Emerson 47D01U-843 Panduan Petunjuk Instalasi - Halaman 6
Jelajahi secara online atau unduh pdf Panduan Petunjuk Instalasi untuk Unit Kontrol Emerson 47D01U-843. Emerson 47D01U-843 8 halaman. Universal heat pump defrost control
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Table 2: Set-up Table Options
Pressing Option
Set-Up Feature
Pressing Select Button (Choices)
Button Displays
Maximum defrost time
Auxiliary heat lockout
Low temp compressor
cutout
*
Brownout Random Time
start delay
*
Low Pressure switch
*
High Pressure switch
*
24V Brownout Protection
* Denotes Default Setting
Note: Options time out after 30 seconds
OPERATION
Demand Defrost Mode
Configured for demand defrost the controller monitors the mode of operation through the "B/O"
terminal, outdoor temperature, outdoor coil temperature and compressor run time to determine when
a defrost cycle is required.
• Defrost is initiated by calculating the difference between the outdoor temperature and coil
temperature.
• At initial power up, a sacrificial defrost cycle initiates to make sure residual frost/ice has not
accumulated on the coil before the control can calibrate itself.
Timed/Temperature Defrost Mode
Configured for Timed/Temperature defrost the control uses the outdoor temperature sensor, the defrost
enable temperature and the defrost cycle time to initiate a defrost cycle.
• Compressor run time is accumulated when the coil temperature is below the defrost enable
temperature (ET).
• If the compressor run time accumulated reaches the defrost cycle time, the control will enter
defrost mode (dc).
Defrost Sequence for both Demand and Time/Temperature Modes
a.) Energize the auxiliary heat signal "W/D/X2" (out)
b.) Switch the RV to cool mode and initiate Defrost Compressor Switching Delay
c.) De-energize the compressor after "Defrost Compressor Switching Delay" time and initiate RV Shift
Delay if RV Shift Delay selected is not zero. The system will not de-energize the compressor if the RV
Shift Delay selected is zero.
d.) De-energize the FAN.
e.) The system will wait for the RV Shift Delay to expire if the RV Shift Delay selected is not zero.
f.) Energize the compressor to start the Defrost operation, ignoring the Compressor Short Cycle Delay
g.) Defrost is terminated when the coil temperature exceeds the selected termination temperature, or
by maximum defrost time.
6
Set-Up Details
*
Selection limits maximum Defrost Time
(minutes)
Settings allow the control to act as an outdoor
thermostat to prevent auxiliary heat from
coming on until the outdoor temperature drops
*
to the selected temperature (Degrees F). More
info, page (7).
Settings allow the control to act as an outdoor
thermostat to turn off the heat pump and use
only Auxiliary heat when it's too cold for the
*
pump to operate efficiently (Degrees F). More
info, page (7).
"On" selects a 5 to 90 second Random Time start
delay after a brownout. More info, page (7).
Accommodates systems with or without a Low
Pressure Switch - if the system does not have a
low pressure switch set to "of"
Accommodates systems with or without a High
Pressure Switch - if the system does not have a
high pressure switch set to "of"
"On" turns off the compressor and fan if low
voltage drops below 15.5 VAC. More info,
page (7).