Honeywell RLV3100 Owner's Manual page 3

All cables and connections must comply with local electrical
codes. This thermostat has tinned copper wires for line and load
connections. Special CO/ALR solderless connectors must be used
if these wires will be connected to aluminium conductors.
Fig. 1 2-wire Installation.
Fig. 2 4-wire Installation.
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M35688
M35689