31
5-572.10
(Not Shown) Circuit Analyzer – (OPT) (All Except Digit 12=9)
The circuit analyzer is factory installed on the door of the
electrical section. The circuit analyzer is used to quickly assist
service personnel in troubleshooting by monitoring the unit firing
sequence and vital operating steps. Lights will come on as a
point of electrical operation is passed and proven. If any light is
not lit, that is the point where failure occurred.
For units with the Modine Control System option (Model Digit
12=9), this feature is integral to the control logic and provides
service personnel with real-time operating status of the unit
systems. Refer to the latest revision of the Modine Control
System Manual, literature 74-510 for additional information.
Figure 31.1 - Circuit Analyzer
j
j
Circuit Analyzer tagging will vary based on the unit ordered. Circuit
analyzer shown is for reference only.
COMPONENT DESCRIPTIONS
For Modine Control System Units Only (Model Digit 12=9)
The following items may be included with units configured with
the Modine Control System option:
(56) Carel Microprocessor Controller
The Modine Controls System utilizes a Carel
programmable microprocessor controller that is factory
installed in the duct furnace electrical section.
(57) Carel pLDPro User Interface Panel
The interface allows a user to access the Carel controller
for setpoint changes and to view the operational status
of the equipment. The interface features an LED backlit
graphic display and buttons for excellent visibility.
(58) Control Relays - (OPT)
The control relay(s) are factory installed in the duct furnace
electrical junction box. The relay has a 24V coil with double-
pole, double throw (DPDT) contacts. Refer to the unit wiring
diagram for the switching function of the relay. The two
normally open and two normally closed contacts are rated
for a maximum of 8A @ 230V/1Ph.
(59) Unit Enable Relay - (OPT)
The control relay is factory installed in the duct furnace
electrical junction box and is used to enable the unit based
on contact closure from a customer enable circuit. The
closing of that contact will power a 24V relay from the unit
mounted controller and enable the unit in On or Occupied
mode. The relay provides electrical isolation to the
controller for protection.
(60) Wiring Channels with Cover - (STD)
The wiring channels organize and separate high voltage
and low voltage wiring.
(61) Return Air Sensor (not shown) - (OPT)
This sensor is required on all units that have a mixture of
outside and return air. The sensor is field mounted in the
return air ductwork. It may be dry bulb only or enthalpy
(temperature and humidity).
(62) Outside Air Sensor (not shown) - (OPT)
This sensor is required on all units except 100% return air
units and is field installed. Depending on the unit
configuration, the sensor may be duct mounted or remote
mounted. It may be dry bulb only or enthalpy (temperature
and humidity).
(63) Mixed Air Sensor (not shown) - (OPT)
This sensor is required on all units that have a mixture of
outside and return air and is factory mounted in the blower
cabinet. The sensor is dry bulb temperature only.
Refer to the latest revision of the Modine Control System
Manual, literature 74-510 for additional information.
