TM077: 325 & 410 Series II heat Pump Service Instructions. REV AA Issued: April 2019 timer should be fitted to prevent. MODEL #TM-089. OPERATING INSTRUCTIONS. TIMER. 1. Set a period of time for the unit to be “ON”. Locate the gray pins and push them down at the.TM-077 Instruction.pdf. Outdoor Mechanical Timer • Outdoor mechanical pin timer with one grounded outlet • It's great for controlling lights, fans, pump, This outdoor mechanical timer has 48 pins with 24 hours daily repeat function. Full 13 Amp rating will handle lighting and heavy-duty loads. Operation