10. Check for 480 vac across the terminals at the top of the main disconnect circuit breaker (Fig. 10). Manually turn on circuit breaker and check for 480 vac across the terminals at the bottom of the breaker. Check for 120 vac across the secondary winding of the control transformer (Fig. 11).

11. Make sure that the EMERGENCY STOP control (Fig. 2) on the control panel operates properly. While power is ON, open the panel and check for 120 vac across terminals 1 and 2 inside the control panel. Push in the control. A light should come on inside the control. Now check to make sure there is no voltage across terminals 1 and 2. Reset the control.

12. On all thermal fluid pumps, temporarily remove guard that covers pump coupling and check that pump shaft is properly aligned with motor shaft. Rotate shaft by hand to make sure that pump is free to turn.

13. Purge air from the seal chamber of all thermal fluid pumps according to the pump manufacturer’s instructions furnished with the heater.

14. Set the controllers per instructions that follow.

Setting controllers

1. Set the power disconnect switch (the handle) on the control panel (Fig. 2) to ON.

   The light labeled POWER ON should come on.

2. Make sure the MODULATING CONTROLER and HIGH MEDIA TEMP. CONTROLLER (Fig. 2) are programmed according to the supplementary information provided by Heatec for Honeywell UDC3300 and UDC2300 controllers. (This information is on sheets laminated in plastic and stored inside the control panel. See also separate Tec-Note on programming and re-tuning Honeywell UDC3300 controllers.

   The Honeywell UDC3300 is the MODULATING CONTROLER. The Honeywell UDC2300 is the HIGH MEDIA TEMP. CONTROLLER.

3. Adjust the set point on the MODULATING CONTROLLER (Fig. 2) to 200 degrees F. To adjust set point, use the up-down arrows on the controller. Do not adjust the set point above 200 degrees F at this time.

4. Adjust the set point on the HIGH MEDIA TEMP. CONTROLLER (Fig. 2) to 250 degrees F.

   The HIGH MEDIA TEMP. CONTROLLER shuts down the heater if the temperature of the thermal fluid reaches this set point.

5. Set the power disconnect switch (the handle) on the control panel (Fig. 2) to OFF.