1. Roof Top Unit Overview (MAGNUM)
Revision /16/2018
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2. RTU Magnum Joins the Magnum family of software: HVAC (and LWC) CENT
REFR
All Magnum software is supported by:
MCS-Config which builds the units profile.

3. RTU Magnum All Magnum software is supported by:
MCS-CONNECT for Communications
MCS-Connect will indicate the current state of the system as viewed in
above screen or on your Keypad.

4. RTU Magnum Purpose
Purpose is to provide flexible control to roof top units that provide heating, cooling and dehumidification to a building.
Plus the necessary ventilation control of fans and dampers, to insure proper air quality and building pressure.

5. RTU Operation Steps At Power Up Determine Building Mode
If the unit is not in a LOCKOUT condition, the system will determine if the supply fan can be started. If yes the fan will be started and no other functions can be initialized until flow has been established and the minimum supply startup time (setpoint #108) has passed.
Determine Building Mode
The MCS-MAGNUM will determine the building mode as Occupied, Unoccupied, Override, or Morning Warm Up.
Determine Unit mode
The setting of the unit mode will enable the cooling, heating or dehumidification functions to be executed. The setting of the control mode will be based on the control sensor for the Ventilation Mode.

6. RTU Magnum Occupied/Unoccupied
Occupied can be indicated based on a schedule
or digital input
Unoccupied can be over ridden with an override
indicator
Status:
Occupied, set point values.
Unoccupied, set point values adjusted with night set back
Override, same as occupied

7. RTU Magnum Warm Up Option
A warm up can be initiated by either a schedule to indicate
occupied or unoccupied and prior to moving to occupied mode, the system will provide heat to the building to enable a warm up period or by a sensor input selected by the Forced Warm Up cell.

8. MCS RTU Magnum Supports up to 80 Relay Outputs
Supports up to 112 Sensors Inputs
Supports up 28 Analog Outputs
Supports 255 Set points
Supports storage of last 100 alarms (plus extended info for safety alarms)
Supports 1008 History Samples for all inputs & outputs

9. RTU Magnum Safeties All HVAC safeties & preventive action are active.
Individual safeties are provided for each fan, damper, etc.
Smoke & fire safeties also provide the ability to purge the building
Clogged filter safeties
Energy Recovery Wheel safeties

10. RTU Magnum Safeties & Faults
High Static Pressure
Low Static Pressure
Supply Fan VFD Fault
Exhaust Fan VFD Fault
Return Fan Fault
MOD Gas Alarm
No Ignition Alarm
SCR Heating Alarm
Clogged Filter Alarm
Energy Wheel Alarm (No Rotation)
Energy Wheel Alarm (Fault)
Smoke Alarm
Fire Alarm
Smoke Purge Alarm

11. RTU Magnum Compressor Types
The compressor type is selected from a drop down list in the Cooling Information panel on the Magnum RTU screen.

12. RTU Magnum Modes Modes of operation Ventilation Cooling Heating
Screen Shows General Settings
in MCS-CONFIG, this includes
mode of operation and sensor
control, general & unit sensors,
occupied control, and vestibule control.
Modes of operation
Ventilation
Cooling
Heating
Dehumidification

13. RTU Magnum Modes of Operation
Control sensors can be selected from return, supply, zone or ambient sensors. Set points will enable the modes to be active or ‘Forced’ sensors can be used.
The control sensor for “Switch to Cooling/Heating’ based upon a set point will enable these modes to be entered or keep the unit in the Ventilation Only mode.
When the system is in the Cooling, Heating or Dehumidification mode, the sensor control for that mode is selected independently.

14. RTU Magnum Vestibule Control
Vestibule control is based upon the temperature control sensor.
Fan, Cooling & Heating can be controlled.
Set point #246 contains the heating target. If the vestibule temperature is below the heating zone the heating relay will be turned on.
Set point #247 contains the cooling target. If the vestibule temperature is above the cooling zone the cooling relay will be turned on.
If either the cooling or heating relays are on, the fan relay, if specified, will be turned on.

15. RTU Magnum Ventilation Mode
Screen Shows Ventilation Settings in MCS-CONFIG

16. RTU Magnum Ventilation Information
Individual control can be specified for:
Building PSI
Supply Fan
Exhaust Fan
Return Fan
Outside Air Damper
Exhaust Damper
Relief Damper
CO2 Control
Energy Recovery Wheel
Smoke Indicators & Relays

17. RTU Magnum Ventilation Fan Options
Building PSI: control can be either Direct, Reverse, or Not Used
Supply Fan: (control on Duct Static PSI)
Always On ( applies only if Occupied)
Cycle (on if heating or cooling needed)
Set up as modulating or fixed on/off
Can have 1 or 2 fans
There is a pre-delay, post delay on the supply fan. Once the supply fan is on there is a delay before cooling or heating are allowed to stage up .
Exhaust Fan: (control on Building PSI)
Return Fan: (control opposite of supply fan)

18. RTU Magnum Ventilation Damper Options
Outside Air Damper:
Set up as modulating or fixed on/off
Control can be based upon:
Local minimum fresh air requirement
Level of CO2
CFM (air movement)
Building Static PSI
Will provide economizer cooling as first stage of cooling if conditions allow.
Report on Fault Detection & Diagnostics (based upon California Energy Commission requirements)

19. RTU Magnum FDD
Report on Fault Detection & Diagnostics (based upon California Energy Commission requirements)
Option, OAD Fault Detection & Diagnostic’ must be Enable.
Purpose is to track the OA damper changes & effect on the air temperature of the unit.
If the damper has not kept the air temperature within its control zone then this is considered a fault.
This will not have effect on the OA damper positioning.
Set points #251, delay, & #252 controls the temperature control zone.

20. RTU Magnum Energy Recovery Wheel
Purpose is to capture potential lost energy by using the leaving air temperature to precondition the incoming fresh air.
During the warmer seasons, the system pre-cools and pre-heats in the cooler seasons.
The Energy Recovery wheel relay can be active when the supply fan is on and the system is not in economizer (free cooling) state.
A Bypass Damper can also be controlled
When on for a given period of time a defrost cycle will be initiated if the outside temperature is less than the defrost temperature.

21. RTU Magnum Cooling Mode
This mode is based upon the existing HVAC control functions to control compressors and their safeties. The controlling sensor is selected in the General Info screen.

22. RTU SUPPORTS: 8 circuits
Various types of Compressors & refrigerant types
Etc. same as HVAC.
Also added a Digital Scroll type of Analog Output.
If selected, and compressor is off… output will be equal to .7vdc.  When compressor called to run, analog output will vary between 1.5vdc to 5vdc output.

23. RTU Magnum Heating Mode
This mode provides either 1 or multiple steps of heating.
The controlling sensor is independent from other modes.

24. The types of heating can be:
Direct Fire (up to 6 valves)
Modulating Gas (up to 6 valves)
Modulating Hot Water
Split Manifold (up to 6 valves)
(above types of heating support Auxiliary Heating)
Modulating SCR (VFD, may not be used, & up to 30 steps of electric heating)
On/Off Hot Water (up to 30 steps)
Staged (up to 30 steps)
If multiple steps, current step must be at maximum capacity before next step is allow to start.

25. RTU Magnum Condenser Info
All condenser types & options are the same as HVAC.

26. RTU Magnum Dehumidification Mode
Area is too moist, humidity needs to be reduced.
In this mode a fixed number of cooling stages are indicated.
Cooling stages that have reheat capability are the first on.
Cooling will reduce the humidity in the air.
If heating is required the cooling stages reheat will be used.

27. RTU Magnum Dehumidification Mode
The types of reheat are:
Modulating
Fixed Step (number will be provided)
None
A Return Air Bypass Damper can also be controlled.
If additional heating is required the heating specified for the heat mode can be used, this is an option.

28. RTU Magnum Humidification Mode
Area is too dry, need to increase humidity.
When the system is NOT in cooling mode, humidity can be increased by modulating a Steam/Mist valve.
The control sensor is
specified and based
upon a set point, the
associated analog
VFD will be modulated.

29. MCS RTU Magnum Provide an over view of the RTU capabilities.
Stress the various options & flexibility.
RTU is separate software but it has all of HVAC’s cooling, EXV & condenser control.
RTU supported by the common MCS Configuration & Communication programs.