Troubleshooting - heat-timer MPCQ Platinum Installation And Operation Instructions For

Steam heating and sequencing control

Table of Contents

Sensor INPUTS

Display shows Sensor OPEN or SHORT

When OPEN, Check if the sensor is connected and the wires are continuous to the MPCQ Platinum. Finally, follow the procedure

for Display Shows Incorrect Temperature or Pressure. When in SHORT Remove the wires from the sensor terminals. The

display should change to read OPEN. If it does not, the MPCQ Platinum may be damaged.

Display shows an Incorrect Temperature

Remove the wires from the sensor terminals. The display should change to read OPEN. If it does not, the MPCQ Platinum may

be damaged. Take an ohm reading across the detached sensor wires. The ohm reading should correspond to the Temperature

sensor Table. If it does not, the sensor may be damaged.

Display shows an Incorrect Pressure

If the reading is a specified amount above or below the actual pressure adjust it using the System Trim. If the reading is SHORT,

remove the wires from the sensor terminals. The display should change to read OPEN. If it does not, the MPCQ Platinum may

be damaged.

CONTROL OPERATION

Too Much Heat

Check if the control has any of the following:

•

Heat Adjustment - If the overheating occurs only during specific hours, check the Day/Night

Schedule (page 26), Day/Night Heat Adjustment (page 21), Day/night Cutoff (page 21), or the

Setback settings (page 22).

•

Boiler Mode Settings - The MPCQ Platinum will only sequence boilers their mode is set to

Auto or Standby. Make sure none of the boilers have their Mode set to ON. See page 26.

•

Control Settings - The Last Stage Hold will allow only the Lead boiler to exceed the set point.

If the setting is too high and only the Lead boiler is on, the system can overshoot. Reduce the

Last Stage Hold setting. See page 24.

Too Little Heat

Check if the control has any of the following:

•

Setback and Day/Night Schedule - If reduced heat occurs only during specific hours, check

the Day/Night Schedule (page 26), Day/Night Heat Adjustment (page 21), Day/night Cutoff

(page 21), or the Setback settings (page 22).

•

Boiler Mode Settings - The MPCQ Platinum will only control boilers their mode is set to

Auto or Standby after a delay. Check if any boilers have their Mode set to Manual, Off, or

Standby Delay. See page 26.

Boilers are Short-Cycling

•

Minimum Runtime - Increase the Minimum Runtime only if all boilers tend to short-cycle.

See page 24.

•

Last Stage Hold - Increase the Last Stage Hold only if the lead boiler tends to short-cycle.

See page 24.

System is Overshooting or Oscillating

•

Reaction Time and Minimum Runtime - If the system is overshooting, increase the Reaction

Time (See page 23). This will allow the MPCQ Platinum enough time to respond before

bringing on another stage. However, if the system was oscillating, increase the Reaction Time

and the Minimum Runtime. See page 24.

•

PID vs OSS - If the application requires fast response that the normal PID mode cannot

provide, try using the OSS mode and adjust the Throttle according to the system requirements.

See page 17.

MPCQ Platinum Installation and Operation Manual