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17.2.4. Electronic Components (MWHA018S4)

Step 1. Removetheconnectorforthecompressor.

Step 2. Pulloutconnectorsforthecondensercoil

temperaturesensor(T3),outdoorambient

temperaturesensor(T4)anddischarge

temperaturesensor(TP).

Step 3. Disconnectthefour-wayvalvewire.

Step 4. Disconnectthegroundwire.

Step 5. Removetheconnectorfortheindoorunit.

Step 6. Removeelectroniccontrolbox.

17.2.5. Electronic Components (MWHA024S4)

NOTE: Antistatic gloves must be worn when you

dissemble the electronic box.

NOTE: Remove the panel plate before disassembly the

fan.

Step 1. Removetheconnectorforthecompressor.

Step 2. Pulloutthetwobluewiresconnectedtothe

expansionvalue(notapplicabletoACunitsonly)

Step 3. Pulloutconnectorsforthecondensercoil

temperaturesensor(T3),outdoorambient

temperaturesensor(T4)anddischarge

temperaturesensor(TP).

Step 4. Disconnecttheexpansionvalve.

Step 5. Removeelectroniccontrolbox.

Compressor

Reactor

4-way valve

Fan Motor

EEV

T3, T4 and TP

17.2.6. Fan Disassembly (MWHA009S4 and

MWHA012S4)

NOTE: Antistatic gloves must be worn when you

dissemble the electronic box.

NOTE: Remove the panel plate before disassembly the

fan.

Step 1. Removenutsecuringthefanwithaspanner.

Step 2. Removethescrewssecuringthetopcover.

Lennox MHA Series Service Manual

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