Universal Heat Pump Defrost Board Install
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- čas přidán 2. 07. 2024
- Bert installs the Emerson White-Rodgers Universal Heat Pump Defrost Board (47D01U-843) on a Carrier heat pump. It is a single-stage universal defrost control that replaces a wide range of OEM parts and can be configured to do time/temperature or demand defrost.
The Emerson White-Rodgers single-stage universal defrost board comes with the outdoor temperature lockout thermostat, an LED display, short-cycle and brownout protection, self-tapping screws, and sensors in the box. It also has error code recall, so you can see recent error codes. The cross-reference chart is located on the packaging and contains several brands and model numbers.
Bert starts by plugging in the thermostat wiring, outdoor temperature sensor, and coil temperature sensor to the board straight out of the box. Before working on the unit, he makes sure the power is off. Then, he takes a picture of the layout so that he can remember how the wiring is configured and what the OEM board's orientation was. In some cases, the OEM will have a thermostat sensor that will be rendered obsolete by the outdoor and coil temperature sensors of the Emerson White-Rodgers universal board. He then mounts the board with the self-tapping screws to secure the board in the best possible orientation.
With the board in place, Bert secures the unit's thermostat wires to the corresponding wires on the board with wire nuts. The board allows you to stop the thermostat from bringing on auxiliary heat in some scenarios, so you can break the auxiliary heat signal through the defrost board; you would include the brown wire at the WIN terminal. Otherwise, you would just secure the white wire at the WDX2 terminal under the wire nut.
With the low-voltage wiring hooked up, Bert begins wiring the safeties, contactor, and reversing valve. He uses wire nuts on those connections as well, though male spades may also be used. There is also a loss of charge pressure switch in the circuit, which hooks up to the low-pressure switches and will open when there are conditions that resemble low refrigerant charge. Bert makes sure that the fan relay is wired so that it is energized constantly with the high voltage.
Then, Bert puts the sensors in optimal locations; the outdoor temperature sensor should be away from direct sunlight, and the coil sensor should make contact with the coil. When everything is in place, Bert cleans up his wiring with some zip ties.
With the board fully wired in, Bert restores the low-voltage control power. The board flashes H, indicating that it's in heat (H) and in time delay (flashing). He cancels any calls for heating and cooling and goes through the options until he reaches OE, which allows him to configure the board to match the original manufacturer's defrost cycle. He sets it to 1, which is the setting for Carrier units, and describes the various manufacturer settings compared to the default Emerson White-Rodgers settings.
The customizable codes on the LED display include Er (error), Fr (fault recall), OE (quick setup), and then the individual configuration options: dF (defrost type), Et (enable temperature), tt (termination temperature), SS (short-cycle time), r (reversing valve power), Sd (reversing valve shift delay), dt (maximum defrost time), hL (auxiliary heat lockout), Lt (low-temperature compressor cutout), rt (random start delay), LP (low-pressure switch on/off), HP (high-pressure switch on/off), and Bo (brownout protection on/off).
Then, Bert tests the system operation to make sure the heat pump will actually switch to defrost mode; he bypasses the time delay and forces defrost. He also runs the unit and heat mode without the fan to cause frost to appear on the coil, which causes the unit to go into defrost by shifting into cooling mode and sending hot discharge gas through the coil. When you're working on systems with these defrost boards, Bert recommends doing a visual inspection and testing the sensors by ohming them out.
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This control is excellent! Defrosts perfectly even with blizzards! Installed 3 years ago at my house 22 year tech.
I just installed one of these for the first time yesterday! OEM board was available but the sensor was a factory order and the system wouldn't stay in defrost for only 2 seconds even though the coil was -20 and sensor closed. We opted to replace the board and sensor with this. Worked great and easy install!
Love the WR defrost board allows me to have a board on hand I normally wouldn’t have. Two things though 1 I like spade connectors over the wire nuts but I have trouble finding a insulated spade connector that fits into the male spades WR has on the harness. The other thing I just put one of theses things on a month or so ago and we had -15 to -30 wind chills they should bring the NFC set up over to this so I can set it up in my warm truck 😅😉
3:35 Correction - the fan relay specifically on the 47D01U-843 is NO, not NC. This board energizes the fan relay to close in and start the fan 1 second after engaging the compressor/fan contactor, and 1 second after exiting defrost. When the unit shuts down or enters defrost, the fan relay is de-energized 1 second after the contactor opens or reversing valve shifts (when RV shift delay is disabled). I have installed this board in 2 different units and know it well. This board uses a NO fan relay to offset the fan startup from the compressor startup to lower inrush starting current. I think this is a weak point in the board as this relay is switched and energized every time the unit starts, even during cooling. A NC relay would be better since it would only energize to open during defrost.
Exactly the solution for my failed defrost board on a TCH260AKAA. I was shopping around and this video helped me with the decision. Great info as always. Keep up the good work!
Good video.
Def worth keeping one on the truck, I've always put in oem in the past which takes a few days to get at the least, but why only for single stage units? I don't get that. Or do they make others for two stage and you're not mentioning them? I just can't see any reason they wouldn't have them for two stage, dual fuel setups which in my area in CT is very common
i am so happy to now see this video. Thanks for putting out. Please I have a question. My RHEEM heat pump (out door unit) is flashing red on the top indicator. (The other indicator is not lit.) Do you know what this flashing means? This unit DOES NOT comes on in the HEAT mode. I checked the board, and found out that there was no 24v voltage going to the CONTACTOR COIL, from it, BUT, there was 24v between the R and C terminals on it. I am thinking that this board is defective. A reply will appreciated. thnx again.
Another point is, that it’s cheaper than the oem board in some cases!!
Thank you for sharing the information and for all the good videos, thank you
Sir. Why while pulling vacuum it could blow oil (Vacuum pump oil) into the hose?
That normally means the check valve has failed on the vacuum pump itself. I’ve had this happen also.
@@BleedingEdgeHVACR Thank you sir
I plan to replace my existing defrost control board (HK32EA001) on my 4 ton Carrier duel fuel (propane -backup furnace) heat pump with this Universal Defrost board. But before I order a new universal defrost board I want to make sure one thing- my question is that currently I set the carrier's programmable thermostat so that it switch to propane furnace from heat pump mode when outdoor ambient temperature is lower than 20 deg(F) - (currently there is a ambient temperature sensor is installed), will this new board impact this feature? In other word, will this current feature be impacted/disrupted by the new board? When electric power goes out I switch to emergency heat to run the gas furnace. I will really appreciate your response! Thank you !
Where those two yellow wires that he is connecting to LPCs come from? One yellow wire from Y (am I right?) and the other yellow wire from where? It is not clear to me. Thanks
Why is this defrost board only compatible with certain boards?
Or what settings could other boards have that this one doesn't?
The Emerson White-Rodgers Universal Heat Pump Defrost Board's compatibility list is quite long. If the defrost board you are looking for is not on the list, chances are the condenser fan motor may be a communicating motor or communicating system with defrost integrated into other components. Most inverter systems have a programing sequence internal to the main board for defrost.
What reasons would a company not want to keep a universal on the truck? Serious question btw.
Usually the reasons a company would not want to keep a universal component in stock or on hand is cost. Some universal parts can have a higher cost compared to the OEM part. Keeping a higher cost part in-stock raises the companies overhead until that component is used and can be charged to a customer.
Great kit just a shame wire nuts look so old and outdated. 😞
Agreed wagos would be better.
What are the reasons for not being able to use this on a two-stage?
@@blakeperson9189 "Really ?" Thanks for that "inside the box thinking " reply !
Great question. When we talk about a two stage system it is important to remember that the compressor has 2 different speeds (Typically 1st stage is 60% capacity and 2nd stage is 100% capacity). With utilizing this type of control on a two stage system you run the risk of the unit running longer in defrost as only the first stage will be energized utilizing 60% capacity instead of the full 100% during defrost. The longer a unit runs in defrost the longer the system goes without delivering heat to the space and can quickly loose control of the space temperature under heavy loads. I hope that answers your question!
@HVAC School so then why don't they just have it run defrost in 2nd stage then? Not making much sense here. And what about duel fuel? If the defrost has to be on 1st stage for whatever reason, you got your emergency heat running at that time anyway so there would be no load issues.
@@HVACRTECH-83 The board has no provision to control the capacity solenoid. Emerson makes another board that is "universal" and can be use in a 2 stage unit. It can handle ECM or PSC fan motors and has ComfortBridge communication capabilities.