Raypak Hot Water Energy Management Control Using The Front Panel To Check Sensors And Relays

SE-Sensors

Supply 136.4

Desired 135.0

Return 128.2

USING THE FRONT PANEL TO CHECK SENSORS AND RELAYS

The RayTemp front panel features an alphanumeric LCD display of four rows by 20 lines. Six keys are provided to select screens, fields, and make program changes. The up-arrow and down-arrow "WINDOW" keys are used to step thru each of the screens. The down-arrow screen selects the next screen while the up-arrow key selects the previous screen. The left-arrow and right-arrow "FIELD" keys move a flashing cursor to select different sections within a screen. The plus and minus "VALUE" keys are used to make changes to a selected field or numeric value. Plus increases the selected number or selects the next option. Minus decreases the selected number or selects the previous option.

Using the down-“WINDOW” key select the “SENSORS” screen and verify that each temperature sensor is measur- ing the correct value. It’s best to use a reliable temperature reading device, like a surface thermocouple or a digital infrared thermometer. Thermostats and mercury ther- mometers are frequently inaccurate. If the readings dis-

agree by more than two degrees there may be a problem with how the sensor is attached. Also check for correct wiring at the terminal block.

				Next select the “RELAY STATUS” screen and manually
	RT-Relay Status			verify that you can turn each water heater or stage on and
#1	#2	#3	#4	off. You do this using the field and value keys. If the heater
ON	OFF	OFF	OFF	does not	turn on it	may be necessary	to increase	the
				optional	secondary	mechanical aquastat	setting a	few

degrees. Use a multimeter to troubleshoot if problems per- sist. Return to the second screen titled “Master On/Off Mode” and put the control in “Bypass”. The water heaters will now run using the optional secondary mechanical aquastats until program- ming of the control has been completed, explained in the next chapter.

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