Lennox MHA018S4S-1P - Electronic Components (MWHA009 S4 and MWHA012 S4)

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Top Cover
Step 4. Removethescrewsfromthefrontpanelandthen
removepanel.
Front Panel
Step 5. Removethescrewsecuringtheservicevalves
coverandthenremove.
Service Valves
Cover
Step 6. Removethescrewssecuringtherightpanel
coverandremovepanel.
Front Cover
17.2.3. Electronic Components (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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
T3, T4 and TP
EEV
Fan Motor
4-way valve (HP only)