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Electro Mechincal Steam Heating Control






The EPU and EPU-CH are outdoor/indoor heating controls for steam heated buildings. They effectively regulate the ambient indoor temperatures according to outdoor temperature.The heating system is shut down when the outdoor temperature rises above an adjustable set point. A built-in program clock allows the control to hold lower temperatures during the night or when the building is not occupied. An adjustable morning warm-up is also included.


The EPU and EPU-CH run on the cycle concept. The cycle concept causes the heating plant to run longer as outdoor temperatures fall. This means as outdoor temperatures fall,more heat enters the building, and the ambient indoor temperatures remain constant and comfortable.



Heat-Cycle Chart

The table indicates the number of minutes within the hour that the cycle will be On (Boiler On)




















  • Automatically cycles boiler operation based on outdoor temperature.
  • A reliable, easily installed, “Weatherhead”. This sensor monitors outdoor temperature and can be run up to 500′ from the panel.
  • A heating system sensor to signal the panel that heat has been circulated to all parts of the building. This sensor is strapped onto a system return pipe and can be run up to 500′ from the panel.
    • Time clock to provide three different heat levels:
    • Day or Normal heat levels for when the building is occupied or tenants are active
    • Night or Save heat levels for when the building is empty or for when tenants are sleeping
  • Morning Warm up to quickly return the building to comfortable heat levels after Night or Save period
  • Separate Day and Night outdoor temperature cutoff set points
  • Separate Day and Night heat adjustments
  • Easy to read lights show what the status of the panel is at all times



EP-60 926554-00
EPU-CH-60 926555-00



Even on very cold days, my Heat-Timer steam heating control sometimes has the boiler turned off and is not making steam. Is my MPC defective?

The MPC is working properly. The MPC or MPCQ Platinum are steam cycling controls for single boiler or multiple boiler steam heated buildings. They run steam cycles which are normally 60 minutes long (the length of the cycle depends on the type of radiation in the system). During this 60 minute period, the boilers will be on and making steam for part of the 60 minutes, and will be turned off for the remaining period. As the outdoor temperature drops, the length of the on periods will increase, and the length of the off periods will decrease. For example, on a 50°F day, the boiler may be on for a mere 5 minutes, and will be off for 55 minutes. However, on a 15°F day, the boiler may be on for 35 minutes, and off for only 25 minutes.