Heat-Timer® Corporation

MPCQ (Steam)

Steam Outdoor Reset Cycling & Sequencing Controls for Steam Heating Systems

Available with optional Internet, BACnet, or Modbus communication


The MPCQ Platinum control Series is steam outdoor reset multi-boiler heating control. It is designed to control multiple steam boilers in single-pipe and two-pipe steam heating systems. It either utilizes 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. Or, sequence the boilers to achieve a fixed set point. Each of these options has a set of pre-configured, but adjustable settings to meet the specific needs of each building. The MPCQ Platinum will reduce fuel costs while maintaining a more comfortable space temperature.The MPCQ Platinum varies the duration of steam flow into a building by controlling up to 8 boiler stages (8 on/off or 4 lo/hi). Additional stages can be added with an Extension Panel.

The MPCQ Platinum also offers multiple communication options. The Internet communication package offers a large group of optional sensors that can be monitored, logged, and used to trigger remote alarms. 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 MPCQ Platinum control. The MPCQ Platinum comes complete with a 30 PSI Transducer and an outdoor sensor and relays.

  • Built-In Steam outdoor reset
  • Can be configured for multiple On/Off Boilers or Multiple Multi-Stage Boilers
  • Adjustable outdoor temperature cutoff
  • 4 programmable Day/Night adjustments per day
  • Pressure lockout
  • Battery backup of program clock
  • Solid state circuitry
  • Digital display
  • Self diagnostics
  • Internet Communication option
  • BACnet IP or MSTP Communication option
  • Modbus RTU Communication option
  • Solid state sensors can be extended up to 500′ from the control
  • E-Prom backup of all program settings
  • 80 Character alphanumeric display
  • EMS capable using the SHUTDOWN and PROVE inputs
  • Network input allows the MPCQ Platinum to connect to multiple sensors (MIG Sensors, Neuron Sensors, Wireless Sensors, Water Meter, Gas Meter, Oil Level, Smoke Alarm) using the Internet communication package to monitor and fine tune its operation
  • The MPCQ Platinum is UL Listed.
MPCQ Platinum Standard 926790-00
MPCQ Platinum for Internet Communication (Ask about our Cellular Internet service) 926790-RINet
MPCQ Platinum with BACnet Communication 926790-BAC
MPCQ Platinum with Modbus Communication 926790-BUS
Internet Communications Upgrade for MPCQ Platinum panels (Ask about our Cellular Internet service) 900340-10-RINet
BACnet Communications Upgrade for MPCQ Platinum panels 900204-10-BAC
Modbus Communications Upgrade for MPCQ Platinum panels 900204-10-BUS
Relay Plug 24VDC 500054-00
Wireless Network Sensor System

I installed Java. But when I login to the ICMS, I get a Java error. How can I fix that?
You will need to uninstall all the JAVA, JAVA 3D, and JRE upgrades first. For that you will need administrative rights on the computer. Then, download the latest JAVA and JAVA 3D through the ICMS System Requirements webpage. Close all browser windows. Also, make sure that both your Antivirus, and Antimalware are either set to accept the JAVA installation or to be fully turned off. Now you can install the latest JAVA. After the installation is complete install the JAVA 3D. Note that MAC OS 10.7 and later does not support the JAVA 3D.

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 doesn’t my Heat-Timer Visual Gold Remote Communication system show the history of the space temperatures?
Question (continued): I can communicate with the system and set any of the panel parameters, but when I go to check how well the system is holding space temperatures, I get only blanks.

To keep a record of the space temperatures (as well as the outdoor temperature and system sensor), the Remote Intercept Platinum or Gold control must know the current time and date. Either the Date and Time were not set or the battery has died and the control power was down for at least a short period of time. Use the SPT (Set Present Time) command. This will prompt for the present date and for the time of day. Once the system has this information, it will keep a log of the histories. If the battery did die, it must be replaced as it keeps the clock active.

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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