10 ton 2 stage. Head pressures on both circuits was 450 PSIG R22. Compressor contactor amps on all phases averaged 26. Name plate compressor RLA was 18.6. No high limit safeties I didn't know Lennox did that. So I broke out the Nu-Brite and gave it a bath. Wow the head pressure dropped to 350 and amps to 18.4 Non all I have to do is move the convection oven exhaust so it's not 1 foot away.