This document provides information for setting Honeywell UDC2300 controllers (DC230L-EE-00-10-0A00000-20-0) (Figure 1) used on Heatec HC and HCS heaters (Figure 2). It applies to all sizes of HC and HCS heaters.

This document along with Honewell manuals applicable to Honeywell UDC2300 controllers are furnished with Heatec HC and HCS heaters. Note: printed copies of Honeywell manuals are now being replaced with a computer CD, which contains PDF versions of their manuals. If you need help on how to use the buttons on the controller, please refer to the applicable Honeywell manual. You can call Honeywell for technical assistance at 1-800-423-9883. Their web site for assistance is www.honeywell.com/imc.

The settings that apply to Heatec HC and HCS heaters are shown in Figure 3. They are the same as those shown on the laminated sheets stored inside the control panel. In case there are any differences, use the information shown on the laminated sheets.

Note: the term media means thermal fluid. Thermal fluid is commonly called hot oil.

The high media temperature controller limits maximum temperature of thermal fluid to a set point (SP) value that the operator presets in the controller. (Do not confuse the set point of this controller with the set point of the Modulating Controller.)

The high media temperature controller senses fluid temperature from a thermocouple in the outlet side of the helical coil. If the temperature of the thermal fluid exceeds preset limits (SP) the controller de-energizes the high media temperature relay, opening its contacts and shutting off the burner. The controller must be manually reset in order to restart the burner. The controller cannot be reset until the temperature of the thermal fluid has fallen below the set point value.

Figure 1. Honeywell high media temperature controller.

Figure 2. Heatec HC/HCS heater.