Raypak RayTemp Hot Water Energy Management Control - Manual (Page 23)

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DD SELECT - Differential Increasing DD lengthens the heater burn cycle; decreasing DD
improves temperature stability. For instance: desired=140, deadband=1, heater turns off at 141
and on at 139. This deadband applies equally to all stages.
D1 SELECT - Temperature Delay Between Stages (In addition to differential setting)
This value causes successive output stages to come on according to the deviation to target tem-
perature. D1 activates additional heaters or stages as demand increases. For example with a set-
point of 140°F and a temperature delay of 1°F, stage 1 will fire at 140, stage 2 at 138, stage 3 at
136, etc., assuming 2°F deadband.
RL TEXT - Relay Logic (1-12) The default value is ++++++++++++. NOTICE: If you select
minus (-) and the RayTemp loses power or fails, then the heater or pump will remain off!!! Edit
text with SPACE, BACKSP, F4, and F5 to return to a plus setting.
SENSOR OVERRIDE TEST
ST SENSOR TEST This feature allows you to simulate any sensor temperature and observe the
affect on desired temperature and relay sequencing. Press SPACE or BKSP to select a sensor, then
override the actual sensor temperature by pressing F4 or F5. Each key stroke changes the tem-
perature by one degree F. Press Shift+F4 or Shift+F5 to adjust the temperature by one-tenth of a
degree (works with PTT). You can change any or all sensors values and then look at other screens.
While in this mode all temperature values will be frozen at the values you select. To restore the
actual sensor values, press SPACE or BKSP until Inactive ###.# appears. The RayTemp will auto-
matically restore actual sensor values 30 minutes after exiting this screen.