MPCQ Platinum Installation and Operation Manual
17
• Shutdown Active
The
SHUTDOWN
Terminals are Shorted. No boilers are active. See Shutdown on page 11.
• Sensor Fault
Either the Outdoor or the System sensor is reading Short or Open. All the boilers are either On or
Off depending on the Sensor Fault setting on page 18.
• LSH: 12 psi
The Lead boiler is in Last Stage Hold. This example shows that the lead stage will turn off when
system pressure reaches 12 Psi. See Last Stage Hold on page 24.
• TGT= 10 psi
In a Set Point Operation Mode the MPCQ Platinum is sequencing stages to hold the Set Point in Day
schedule. See Set Point on page 20.
• Setback to 10 Psi
In a Set Point Operation Mode the target has changed to the setback value due to Night Schedule.
• Prove Failure
After boilers have run for a while, Prove signal was opened. The boiler relays will de-energize.
However, the System relay will remain energized. See Wiring Prove on page 11.
• Waiting for Prove
There is a call for heat and the Prove terminals are open before the boilers start firing. The boiler
relays will be de-energize while the System relay is energized. See Wiring Prove on page 11.
• Sys RunOn: 59sec
The last boiler stage has turned off and the System relay will remain energized for the additional
Run-On Delay of 59 seconds. See System Run-On on page 22.
Startup Settings
SELECT:
Settings/System Startup
If entering this menu option after the control has been set, several warnings will display prior
to entering the Startup menu to emphasize that any changes in this menu will drastically
change the way the control behaves.
ALERT
A good practice after performing any
Startup menu modifications is to check
all operating settings and adjustments to
match the new settings.
Sensor Type
°F for Fahrenheit or °C for Celsius
Default: °F Fahrenheit
SELECT
Settings/System Startup/.../Sensor Type
• It allows the user to display temperature information and settings in either ºF
(Fahrenheit) or ºC (Celsius).
--- SENSOR TYPE ---
F
C
- OPERATION MODE -
Cycle
Set Point
Operation Mode
Cycle or Set Point
Default: Cycle
SELECT
Settings/System Startup/.../Operation Mode
• The MPCQ Platinum can control the sequencing of the steam boilers either by using
the cycle concept (See page 4) or by maintaining an adjustable Set Point.
• When Cycle is selected, the MPCQ Platinum will adjust the cycle on length according to the Outdoor Temperature and the Heat
Adjustment. This option will provide more comfort and fuel savings for building heating applications.
• The Set Point option is useful when sequencing the boilers to maintain a specified fixed target. This can be used in building
heating where additional zone distribution is available or in processing applications.
Cycle Length
(Available with Cycle Operating Mode only)
Adjustable from 10 to 240 minutes
Default: 60 minutes
SELECT
Settings/System Startup/.../Cycle Length
• With most cast iron radiation, choose a 60 minute cycle. If the radiators are very large
or the system is oversized, choose a 90 minute cycle.
• For convector or baseboard radiation, choose a 30 minute cycle.
• For air handlers or blower units, choose a 20 minute cycle.
• The cycle length can be adjusted from 10 to 240 minutes, but it is recommended to
start with the guidelines above.
-- CYCLE LENGTH --
60 Min
[
]
LOGIC
(Available with Set Point Operating Mode only)
PID, OSS
Default: PID
SELECT
Settings/System Startup/.../Logic
• The PID option allows the MPCQ Platinum to sequence stages based on PID. The
PID relies on the rate of change in the System Temperature. The PID logarithmic
calculations foresee changes and sequence stages based on those changes. It is the
most efficient operation for most heating systems. See PID Operation on page
---------- LOGIC --------
PID
OSS
