Marvair MPC-10 PDS/Manual, 09/2020 New
2
➤
Remote Communication Protocol
The Marvair MPC-10 comes standard with both BACnet
and Modbus TCP/IP communication protocols and can
be user selected in the initial setup menu. Using these
communication protocols allows the user to access and
change various data points.
Read Only Access
•
Room Temperature
•
High Temperature Alarm
•
Room Humidity
•
Low Temperature Alarm
•
Lead Unit
•
Phase Fault (For Each Unit)
•
High Pressure
Refrigeration Circuit A
(For Each Unit)
•
Low Pressure Refrigeration
Circuit A
(For Each Unit)
•
High Pressure
Refrigeration Circuit B
(For Each Unit)
•
Low Pressure Refrigeration
Circuit B
(For Each Unit)
•
High Temperature Cut-
Off (For Each Unit)
•
Emergency Shutdown
(For Each Unit)
Read/Write Access
•
Cooling Set Point
•
Heating Set Point
•
Continuous Blower
•
Lead Swap
•
Cooling Stage Differential
•
Heating Stage Differential
•
Low Temperature Alarm
Set Point
•
High Temperature Alarm
Set Point
•
Y Fan Purge Time
•
W Fan Purge Time
•
Anti-Short Cycle Time
•
Lead Swap Period
•
Thermostat Offset
•
AC Unit Shutdown
(For Each Unit)
➤
Thermostat
•
Cooling Set Point: 35°F through 95°F
(1.7°C through 35°C) in 1° increments
•
Heating Set Point: 35°F through 95°F
(1.7°C through 35°C) in 1° increments
➤
Differential
•
Cooling Stage Differential: 1°F through 5°F
(1°C through 3°C) in 1° increments
•
Heating Stage Differential: 1°F through 5°F
(1°C through 3°C) in 1° increments
➤
Incoming Power
•
24VDC
➤
Ambient Temperature During Operation
•
Minimum: 30ºF (0ºC)
•
Maximum: 122ºF (50ºC)
➤
Ease of Installation
The use of Siemens Profinet communication makes
wiring simple. All communication between the HVAC
units and the controller is handled over ethernet cables.
The MPC-10 has eleven ethernet ports located at the
bottom of the controller, one for each unit and one for
remote communication. The order in which the units are
connected does not matter.
➤
Lead/Lag Operation
User selectable changeover from 12 hours to 10 days
in 1-hour increments. If the lead unit loses power, the
next available unit automatically becomes the lead
unit with all the set points of the lead unit. Once a unit
is locked out or losses power it is removed from the
list of available units and will not be called for by the
controller. When the unit is repaired/regains power it
will be added back to the list of available units and can
be called for by the controller. Additionally, a lead swap
button can be found on the HMI allowing service techs
to easily check the operation of each unit.
➤
Alarms
Alarms can be viewed remotely via BACnet/Modbus,
through an on-screen alarm window, and each unit
contains a flash code on the PLC. There are two
classifications of alarms. Unit alarms are specific to the
unit. These alarms will start with the unit designator
followed by the alarm (E.g. Unit 3 Phase Fault). Shelter
alarms apply to the entire building. These alarms include
high/low temperature alarms.
Unit Alarms
•
High Pressure Switch A – The refrigerant pressure on
side “A” has exceeded the set point pressure twice in
a cooling cycle. The air conditioner will shut down
and notification will be sent that there is a high-
pressure “A” alarm.
•
Low Pressure Switch A – The refrigerant pressure on
side “A” has dropped below the set point pressure
twice in a cooling cycle. The air conditioner will shut
down and notification will be sent that there is a
low-pressure “A” alarm.
•
High Pressure Switch B (If Applicable) – The refrigerant
pressure on side “B” has exceeded the set point
pressure twice in a cooling cycle. The air conditioner
will shut down and notification will be sent that
there is a high-pressure “B” alarm.
•
Low Pressure Switch B (If Applicable) – The refrigerant
pressure on side “B” has dropped below the set point
pressure twice in a cooling cycle. The air conditioner
will shut down and notification will be sent that
there is a low-pressure “B” alarm.
•
Phase – This is activated when the unit is out of
phase. If this alarm is activated the alarm window
on the HMI will pop-up and have a message reading
“Unit X Phase Fault”.
•
Emergency Shutdown – This alarm is activated when
the unit is shut down by the user via remote access
or thru the HMI.
•
High Temperature Cut-Off (If Applicable) – This is
activated when the heater in the unit exceeds the set
point. Once this occurs the heater will be unavailable
and an alarm will be visible on the HMI.
•
Communication – This is activated when a unit loses
communication to the main controller. If this alarm is
activated the alarm window on the HMI will pop-up
and have a message reading “Unit X Communication
Fault”. In the event of this alarm the controller will
not call for the affected unit.
Shelter Alarms
•
Low Building Temperature – Activated if the
temperature in the building drops to the selected
temperature. Factory default is 50°F but can be
changed from the parameters page of the HMI in 1°
increments between 30°F and 95°F. If this alarm is
activated the alarm window on the HMI will pop-
up and have a message reading “Low Temperature
Alarm”.
•
High Building Temperature – Activated if the
temperature in the building reaches the selected
temperature. Factory default is 90°F but can be
changed from the parameters page of the HMI in 1°
increments between 30°F and 95°F. If this alarm is
activated the alarm window on the HMI will pop-
up and have a message reading “High Temperature
Alarm”.
s
pecifications
/f
eatures
Marvair MPC-10 PDS/Manual, 06/2020 New
2
