Gasboy Atlas Start-up - Manual (Page 115)

MDE-4334D Atlas™ Start-up and Service Manual · July 2013 Page 5-55
Heater Electronic and Electrical Components
About Ultra-Hi Pulsers
Figure 5-50 shows the Ultra-Hi Pulser.
Figure 5-50: Ultra-Hi Pulser (Commercial Only)
M05689A001 Pulser
Ultra-Hi Pulser
Heater
DEF Heating System (Commercial Cold Weather DEF Units Only)
The Heater Control Board receives logic voltage from the Coriolis Meter Board and 120 VAC
power supply for the heater and fan from line voltage. A Heater Sensor is located within the
DEF cabinet. It monitors the temperature of the cabinet and is connected to the Heater Control
Board. There is also a second sensor in the Meter Interface Board and both the sensors must be
cold. Within the approximate range of 40 °F (4 °C) to 45 °F (7 °C) or lower, the Heater Control
Board activates the fan and heater to maintain the temperature within the cabinet. The heater
circuit will activate and deactivate depending on the temperature within the cabinet. The
sensor, heater, and fan are located within the DEF cabinet. The Heater Interface Board is
located within the electronic cabinet.
When the DEF freezes, it can cause extensive damage to hydraulic components, hence the
DEF hydraulics cabinet is heated. The Service Technicians must be aware of the following
important information regarding DEF freezing:
• The heater is turned on when the sensor detects a temperature of approximately

43 °F (6 °C) in the cabinet. It will commonly cycle on and off and may not run at all times
during cold weather. To test the system, electronic spray circuit coolant can be used on the
cabinet Heater Sensor (not the Freeze Sensor which is attached to the piping). At the same
time, coolant must also be sprayed on U2 on the Heater Control PCA to test the system.