Lennox MCA Series

40
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
18.2.3. Electronic Components (MWCA009S4 and
MWCA012S4)
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)
18.2.4. Electronic Components (MWCA018S4)
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.
18.2.5. Electronic Components (MWCA024S4)
NOTE: Antistatic gloves must be worn when you
dissemble the electronic box.
NOTE: Remove the panel plate before disassembly the
fan.