RTU-05 · Packaged RTU / DX

Heat and cool stages on together

A heating stage and a compressor stage are energized at the same time.

Capacity-basedBAS trendsMedium effort

What does RTU-05 mean?

A heating stage and a compressor stage are energized at the same time.

Why does it matter?

Gas or electric heat is being removed by the compressor — pure waste, and hard on both.

What should you do?

Check the thermostat/controller mode logic and the heat/cool interlock; look for a stuck contactor.

How Energy Agent prices a finding

Written by Pelorus Engineering · Brent Waluzak, P.E. (FL), President, Pelorus EngineeringLast updated
Estimate it

What is heating and cooling at the same time costing?

Estimate the energy spent fighting yourself.

1 ton of cooling is 12 kBtu/h.
Enter a repair or controls-change cost to see the simple payback.
Avoidable cost per yearEnergy Simple payback Enter a cost to fix to see the payback.

    Cooling that only exists to cancel heating (and vice versa) is priced on both sides: chilled water at your kW/ton and rate, heat at your boiler efficiency and gas price, for the hours the overlap lasts. Energy Agent finds the overlap in valve and coil trends.

    Screening estimate. Energy Agent measures the real fault hours and load from your trends and prices them at your tariff.

    Screening-level estimates; confirm with measurement and verification before capital commitment.

    See these rules run on your building.

    Send twelve months of interval data and a BAS trend export. Energy Agent returns a ranked list of what is wasting money, what each item is worth per year at your tariff, and what to do about it.