Pentair Mastertemp 400 controls

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cmiller73

Well-known member
May 1, 2012
264
Houma, LA
Pool Size
12500
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40
I am noticing that my ET is not controlling the heater in a funny way. I can set heat to 92* on the ET settings, but if the heater is set at 90*. It will shut off. Only way to hook up heater to panel is by fireman's switch. No other connections are available.
Am I right in guessing that the water temp reading and the setting on the heater, overrides the temp setting on the ET panel?
If so, should I up the heater's temp setting and then would be able to control the temp from the ET's heater setting? Say put heater on 100*, but have ET setting on 90* or so.
Would the ET then control on/off of heater based on it's water temp and not the heater's internal water temp?


TIA
 
When you connect the ET to a heater using the firemans switch, the thermostat on the Heater should be set to its max. Typically that is 104F. Then the ET setting will manage the heater temperature.
 
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Thanks. I've had them set the same and seems my ET's water temp was off a couple degrees. So I adjusted that but then was wondering why heater would kick off.

I figured that would be the work around. Sad that I spent all this money for automation, and still have to improvise settings. Maybe I was told this by installer but I sure don't remember anything specific like that.
 
Almost all heaters work this way. Thermostatic control via a closed relay is the only way to make heater control available to all automation systems without having to maintain and provide a set of digital controls. RS-485 is starting to show up in newer heater models (Pentair and Raypak) as well as WiFi controls but that greatly increases the complexity of the control system. A simple open/close relay is a lot easier to debug and repair than bad data connection …
 
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