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Thread: Defrost Heater Hold Out Relay
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29-02-2020, 07:24 PM #1
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Defrost Heater Hold Out Relay
Installing a Turbo Air walk in freezer ( owner provided the equipment ) and the diagram shows a defrost heater hold out relay "DHR". It shows the hold out relay contacts are wired to the timer term # 3 and to the field supplied heater contactor "DH1". It does not show the hold out relay coil control wiring. And I can not see a need for the hold out relay "DHR". Can anyone explain ? Thanks.
3/01 - I edited / re-phrased the question.
EVAP: ( R404A )
M#: LED168BEM - 4 ECM FANS
S/N: EDNM168249006
TurboAir Diagram.jpgLast edited by clmanaa; 01-03-2020 at 05:20 PM. Reason: Re-phrased the question
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01-03-2020, 07:07 AM #2
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Re: Defrost Heater Hold Out Relay
looks like its wired from terminal 3 on timer and terminal 3 on the terminal block that connects to n terminal through high limit stat
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01-03-2020, 02:37 PM #3
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Re: Defrost Heater Hold Out Relay
On the line from terminal 3 is shown a circle with DH1, that is the defrost heater relay coil.
Brian - Newton Abbot, Devon, UK
Retired March 2015
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01-03-2020, 05:14 PM #4
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Re: Defrost Heater Hold Out Relay
I edited / re-phrased the question.
