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Over the weekend I sent an email to White-Rodgers Tech Support regarding our discussion in this thread on the 1E78 thermostat. Basically I said, hey, were having this discussion and wonder if you could comment and/or make recommendations.
I received this response this morning:
----------------------
"Thank you for contacting White Rodgers.
In regards to the question on the Discussion Threads. There are a couple of issues when using in a RV application where the thermostat needs to recover from an extreme set back mode.
1- Digital thermostats have, by design, a buffering in the algorithms to recover the displayed set point temperature slowly. The rationale is that if the thermostat were to react in real time to a sudden temperature change the equipment would turn on an off rapidly to this quick temperature change.
a. An example would be if the thermostat is satisfied and holding temperature and someone were to open an outside door for a few seconds and allow a blast of cold air to enter the RV a sudden drop in temperature would initiate a call for space conditioning. The reality is that if the door is only open for a few seconds and then closed it would have little impact on the overall temperature on the RV and the temperature will stabilize with no need for a call for space conditioning. This is why digital thermostats use buffering.
2- Secondly, ensure that the opening in the back of the thermostat where the wires come through has a piece of insulation stuffed in the hole to reduce temperature transfer from the cold walls via air movement into the thermostat.
There is no way to override the buffering built into the thermostat.
Best Regards,
Rae Vincent Balleza | Technical Service Engineer | White Rodgers Division"
------------------
I also called ICM tech support (yesterday) regarding the Frost Sentry FS1500VL garage thermostat we've discussed in this thread. I called because the manual doesn't have ambient-temperature operating specs like we see in the manuals for the 1E78 and for the Honeywell thermostat mentioned above (both of which are 32 degrees on the minimum side). The ICM tech support guy said the FS1500VL is intended to be operated above freezing. He went on to say it will operate (as in turn the furnace on) below that but the display 'starts to go funny' below freezing, adding 'I've only seen it go down to the low-20's and then the display generally gets to the point you can't read it.'
-OC
Over the weekend I sent an email to White-Rodgers Tech Support regarding our discussion in this thread on the 1E78 thermostat. Basically I said, hey, were having this discussion and wonder if you could comment and/or make recommendations.
I received this response this morning:
----------------------
"Thank you for contacting White Rodgers.
In regards to the question on the Discussion Threads. There are a couple of issues when using in a RV application where the thermostat needs to recover from an extreme set back mode.
1- Digital thermostats have, by design, a buffering in the algorithms to recover the displayed set point temperature slowly. The rationale is that if the thermostat were to react in real time to a sudden temperature change the equipment would turn on an off rapidly to this quick temperature change.
a. An example would be if the thermostat is satisfied and holding temperature and someone were to open an outside door for a few seconds and allow a blast of cold air to enter the RV a sudden drop in temperature would initiate a call for space conditioning. The reality is that if the door is only open for a few seconds and then closed it would have little impact on the overall temperature on the RV and the temperature will stabilize with no need for a call for space conditioning. This is why digital thermostats use buffering.
2- Secondly, ensure that the opening in the back of the thermostat where the wires come through has a piece of insulation stuffed in the hole to reduce temperature transfer from the cold walls via air movement into the thermostat.
There is no way to override the buffering built into the thermostat.
Best Regards,
Rae Vincent Balleza | Technical Service Engineer | White Rodgers Division"
------------------
I also called ICM tech support (yesterday) regarding the Frost Sentry FS1500VL garage thermostat we've discussed in this thread. I called because the manual doesn't have ambient-temperature operating specs like we see in the manuals for the 1E78 and for the Honeywell thermostat mentioned above (both of which are 32 degrees on the minimum side). The ICM tech support guy said the FS1500VL is intended to be operated above freezing. He went on to say it will operate (as in turn the furnace on) below that but the display 'starts to go funny' below freezing, adding 'I've only seen it go down to the low-20's and then the display generally gets to the point you can't read it.'
-OC