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Sensor Temperature Calibration – both remote sensors are digital electronic and factory calibrated. Normally
these do not require field calibration or verification. However, if sensor temperature error is determined, use
special PC software disc and PC serial port cable. The PC screen has direct readout of both temperatures, allows
a visual determination of the system's internal logic temperature settings, and can be used to offset either
temperature sensor for troubleshooting and demonstration purposes. This is especially valuable during summer
installation.
SOT bypass – adding a jumper wire between J6 and Common will shorten the SOT time down to 1/30
SOT set point. For example. If SOT dial is set to position 0 (30 minutes), the EZGEO control will switch to full
output in one minute with the test wire in place.
Bad sensor, safety – if the internal logic detects open sensor wire, incorrectly wired sensor, or some bad sensor
transmitted value conditions; the green LED reverts to a pulsing mode. Basically the appropriate sensor is set
internally to a 0° value and the WarmFlo main board only allows stage 1 and stage 2 on.
- OT sensor – approximately 1/10 second blip every ½ second
- ST sensor – two, 1/10 second blips every ½ second
- Both bad – ½ second on and ½ second off, alternating
Safety Backup, Defective Buffer Tank Temperature Sensor
Particularly in northern climates, a defective buffer tank temperature sensor (BT) can set in motion a series of
events which can result in the heat pump shutting down because pressure faults . To protect the home from a
possible freeze-up situation, Electro Industries has designed the Buffer Tank Controller to be capable of
detecting a non-operating tank temperature sensor. Should this happen, the Buffer Tank software will initiate
the following sequence.
1. With the Mode Dial set to Mode B or Mode C and the system under a heating call, the system will
operate in "Standby" condition.
If a cooling call is present, the heat pump is cycled 15 minutes on and 15 minutes off.
2. If the Mode Dial is set to Mode A, the heat pump is cycled 15 minutes on and 15 minutes off in both
heating and cooling mode.
Keep in mind that even though the controller logic can detect a non-operating OT sensor, it cannot detect an OT
sensor which is returning an incorrect temperature value.
Defective Outdoor Temperature Sensor (OT), declared by software
The Buffer Tank Controller software also has the ability to recognize a faulty OT sensor. Should this occur, the
software sets the outdoor temperature to 2° F, the green "POWER" LED will begin to blink, and the software
will change target temperature to the set point.
Internal fuses – the zone controller board does contain a 10A fuse for overload protection for zone pumps.
02/22/2012
Troubleshooting – Buffer Tank Controller
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