Heat-Timer® Corporation

MPC (Steam)

Steam Outdoor Reset Heat Cycling Controls

now available with optional Internet, BACnet, or Modbus communication


The MPC Platinum control Series is designed to operate a steam boiler or a steam valve to provide steam outdoor reset in single-pipe and two-pipe steam heating systems. Utilizing the steam cycle concept and the outdoor temperature, the control varies the duration of the steam supply to the building in a cycle based on the outdoor temperature. Each of these options has a set of pre-configured, but adjustable settings to meet the specific needs of each building. The MPC Platinum will reduce fuel costs while maintaining a more comfortable space temperature.

The MPC Platinum offers multiple communication options. The Internet communication package offers a large group of optional sensors that can be monitored, logged, and alarm set. In addition, Heat-Timer can provide a cellular Internet connection to the control (See Internet communication ). The BACnet Communication package provides BACnet IP or BACnet MSTP compatibility in addition to the capability of communicating using other protocols when used with a Fieldserver gateway. The Modbus Communication package provide Modbus RTU Communication capability to the MPC Platinum control.

With its 80 character alphanumeric display and easy-to-use menu structure, changing settings is a snap. In addition, it incorporates Shutdown and Prove inputs for EMS capability.

  • Built-In Steam Outdoor Reset
  • Can be configured for Burner or District Steam
  • Different Day and Night Adjustable outdoor temperature cutoffs
  • 4 programmable Day/Night adjustments per day
  • Auxiliary Output that can control other equipment based on a separate Built-In programmable 4 separate On/Off schedule settings per day
  • Thermal lockout does not allow the initiation of another heating cycle if the system had steam
  • BACnet IP and MSTP Communication option (field upgradeable)
  • Internet Communication option (field upgradeable)
  • Modbus RTU Communication option (field upgradeable)
  • Solid state sensors can be extended up to 500′ from the control
  • EE-Prom backup of all program settings
  • 80 Character alphanumeric display
  • EMS capable using the SHUTDOWN and PROVE inputs
  • Can link to a Multi-Mod for multiple modulating boilers
  • Additional Output relays to control other equipment based on the MPC Platinum cycle operation
  • Network input allows the MPC Platinum to connect to multiple sensors (MIG Sensors, Neuron Sensors, Wireless Sensors, Water Meter, Gas Meter, Oil Level, Smoke Alarm) using the Internet to monitor and fine tune its operation
  • Optional Remote Communication using the Internet, BACnet, or Modbus. You’ll be able to view status, change settings as well as analyze performance from virtually anywhere
  • MPC Platinum is NYC DEP Approved (DEE #42-04)

The MPC Platinum comes complete with sensors and relays.

MPC Platinum Standard 926785-00
MPC Platinum for Internet Communication (Ask about our Cellular Internet service) 926785-RINet
MPC Platinum with BACnet Communication 926785-BAC
MPC Platinum with Modbus Communication 926785-BUS
Internet Communications Upgrade for MPC Platinum panels (Ask about our Cellular Internet service) 900340-00-RINet
BACnet Communications Upgrade for MPC Platinum panels 900204-00-BAC
Modbus Communications Upgrade for MPC Platinum panels 900204-00-BUS
Relay Plug 24VDC 500054-00
Wireless Network Sensor System

Connected the control to power correctly but no display or LED is on.
Most controls are equipped with a fuse on the back of the main board to help protect the control against power surges. Check the fuse on the back of the control using a continuity meter. If continuity does not exist, replace the fuse with the same fuse size and rating.

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.

Why is my control not turning the boiler on even when there is a call for heat?
First, check the display for any messages as many of the heating controls have several external inputs that can be used to shutdown the boiler. If the message relates to the PROVE input, it may not be shorted or the Prove terminal Jumper is not installed. In this case, the control will not start the boiler. If the message relates to the Shutdown input, the Shutdown maybe shorted remotely. If the message relates to the T-stat input, the T-Stat input maybe opened remotely.

My outdoor sensor reading does not match the actual temperature.
The outdoor sensor measurement may vary based on its location and its sun exposure. In most cases it will never match a weather station that is located several miles away. most current Heat-Timer controls have a Trim feature which allows the sensor reading to be slightly modified just a few degrees to satisfy similar circumstances. If the difference was large, then check the sensor by disconnecting one of its wires from the control. The control should read OPEN. If not, contact technical support.

Why is my temperature sensor reading Open on the control display?
Remove the sensor wires from the control and check for continuity across the wires with and meter. If no continuity existed, check or replace the wires. if continuity did exist, then contact technical support.

Why is my temperature sensor reading Short on the control display?
Remove one of the sensor wires from the control. The control display should change and display OPEN. Then check the sensor wiring specifically around spliced areas. If wiring was good, then disconnect the sensor wires from the control and check the sensor wires with an Ohm meter. The readings should match the sensor temperature chart on the control manual. It not, then replace the sensor. If after removing one of the sensor wires the control read SHORT, then contact tech support.

Why does my Heat-Timer hot water reset control (HWR) flash OPN instead of the outdoor temperature?
Heat-Timer controls use the code OPN when they can not detect a sensor. For example, if someone were working in the building and cut the wires leading to the outdoor sensor, the HWR would begin to flash OPN to signal that the sensor was no longer attached. To find the source of the OPN reading, first make sure that the outdoor sensor wires are attached to the input terminals (the IT terminals in the case of an HWR). Then place a jumper wire across the input terminals (IT). The display should change to read SH-I (the code for a shorted sensor). If the display does change, the HWR is working properly. Check the wires to make sure they are not broken, and locate the sensor to see if it has been damaged.

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