Detroit Radiant Products Company MP Series - Manual (Page 19)

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MP Series
Running Circuit:
After ignition, the flame rod continuously monitors the flame presence . If sense of flame is lost for a time
of 1 .0 seconds or greater, the TP-351A closes the gas valve circuit and a new trial for ignition sequence is
initiated .
Modulating Circuit:
Pre-heat – During the ignition sequence, the TP-3250 operates the blower and gas valve at 100% operation
to optimize ignition . Once ignition is established, the heater will enter a pre-heat cycle for 90 seconds,
operating the blower motor and gas valve at 100% . However, if the heater has cycled in the previous 5
minutes, the controller will skip the pre-heat cycle, and go straight to modulating operation .
The blower motor and modulating coil on the gas valve are energized directly from the TP-3250
modulating controller . The controller utilizes PID logic to match the selected performance curve to the
heater’s operation . Based on the determined system configuration, the control will operate as needed to
match the desired system performance .
Performance Curves
The MP Series is programmed to operate on several different performance curves . These curves are to
allow the user to select the desired operation that best accommodates their specific needs . The
performance curves can be selected either by the Premium User Interface (TP-PUI) or by setting the DIP
switches located under the control cover (Pages 14-15) . The three modes are as follows:
• Economy Mode: Unit operates to maximize thermal efficiency .
• Comfort Mode: Unit operates to maximize perceived human comfort .
• Standard Mode: Unit operates as a balance between comfort and economy mode .
Economy Mode: Economy Mode is intended to maximize thermal efficiency . It is designed to provide a
system that is more thermally efficient than the other modes due to quicker dissipation of heat . This
mode is recommended for applications such as:
• Aircraft hangars
• Car washes
• Unpopulated warehouses
Comfort Mode: Comfort Mode is designed to minimize temperature differentials across the length of
the heater . It is intended to provide a system that has a greater perceived comfort than the other modes
because of the reduction of extreme temperature zones . This mode is recommended for applications
such as:
• Patios
• Loading docks
• Break areas and lunch rooms
• Kennels
Standard Mode: Standard Mode is a balance between Comfort Mode and Economy Mode . It is
intended to provide a system that is moderately thermal efficient while still minimizing the greater
temperature differentials associated with economy mode . This mode is recommended for applications
such as:
• Populated warehouse heating
• Service garages
• Fire Stations
• Manufacturing
• Auto showrooms
3.0 Operation • Sequence of Operation • Performance Curves
• Pole barns
• Foundries
• Parts counters and service desks
• Golf driving ranges
• Woodworking shops