24A34-2 Replaces FIRSTCO First Company E141 TOD 12SH20-3049923 Heat Sequencer 24V primary, 1–switch, 1–timing On: 30–90 seconds, Off: 1–30 seconds For 18-60MAX, 18-60MBX, 18-60MBXR, 18-60HBXB, 18-60VHBXB