Friedrich DSSXEMWRT3 - Heat Equipment Lockout

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General: Custom Energy Savings Settings
37 – HEAT EQUIPMENT LOCKOUT
00 Equipment lockout is disabled (default) - The thermostat will enable both
compressor and electric heat;
01 Compressor lockout - If set to 1, the Thermostat will only allow electric
heat;
02 Electric heat lockout - If set to 2, the Thermostat will only allow
compressor heat.