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Troubleshooting/Repair Helps
1. This Buffer Tank Controller contains several interference suppression components, but as an electronic
logic product, unpredictable and unusual transients or interferences may sometimes cause strange
results. If the Buffer Tank Controller is "acting strange", one immediate step would be power down
reset. Simply turn off the voltage source power when the green LED goes out, count to 10, and re-
energize power supply.
2. The terminal blocks for control wire hook-up are designed for a wire insertion and screw clamp down. If
there is no wire connected and the screw is loose, the screw may not necessarily make a good electrical
contact to the inside components. Example – if you are jumpering the thermostat terminals without
thermostat wire connection or if you are attempting to measure voltage on the screw head, you may get
erroneous or unpredictable results if the screw is not tightened down.
3. Use general heating system logic information and basic understanding of the terminal block wiring
functions when measuring voltage to determine proper operation of this module.
4. The outdoor sensor must be located outdoors for this controller to correctly operate. Do not leave the
outdoor sensor "hanging in conditioned space" and attempt to run this system
Front panel override switch – if the mode switch is set to "B" and gas furnace is active via Buffer Tank
Controller board with a potential heat pump problem, the front panel switch in the up position will transfer the
roomstat to the gas furnace. Depending upon the blower configuration, it should follow with the functioning gas
furnace, but local HVAC contractor needs to verify.
Front panel override switch – if the mode switch is set to "C" and Auxiliary Boiler is active via Buffer Tank
Controller board and a potential heat pump problem is encountered, placing the front panel switch in the "up"
position will transfer the roomstat signal to the auxiliary boiler. Depending upon the pump configuration, it
should follow with the functioning auxiliary boiler, but local HVAC contractor needs to verify.
Alarm/Fault Active
The status LED and alarm output continue until power-off reset. The Buffer Tank Controller will attempt to
maintain room temperature or prevent freeze-up.
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Mode A – by definition, no backup, at each roomstat W cycle, compressor will retry.
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Modes B – with gas furnace standby, forced air roomstat W is transferred to gas furnace operation.
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C – with auxiliary boiler standby, forced air roomstat and hydronic roomstat W is transferred to
auxiliary boiler operation.
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Cooling – same as mode A, each thermostat cycle will attempt a compressor.
Note: Do not repeatedly cycle the compressor and cause consecutive faults. This will result in permanent
compressor damage and perhaps void the product warranty. If the Geo system goes into a fault mode, it has
already made three attempts to clear the limit condition, repeated cycling of the roomstat will not do any good,
and it will simply cause damage. Call for service.
Backup/freeze-up – the intent of modes B and C with either auxiliary boiler or gas furnace is to prevent
building freeze-up. If this Geo system is installed without backup (mode A) there is no secondary means of
creating heat.
Correct use of mode selection – by definition modes B and C installation include gas furnace or auxiliary
boiler
module. If the system is setup in either B or C and there is no gas furnace or auxiliary boiler, freeze-up may still
occur because the roomstats are assuming a heat source which will bring up the temperature to satisfy the
roomstat.
WARNING
WHEN CONFIGURED WITH A GAS FURNACE OR AUXILIARY BOILER (MODES B, or C) IT IS THE
USER'S RESPONSIBILITY TO HAVE CIRCUIT BREAKERS TURNED ON, GAS IN THE TANK, GAS
VALVES OPEN, AN OPERATIONAL GAS FURNACE, BOILER, ETC. THE BUFFER TANK CONTROLLER
CANNOT DETECT "NO GAS IN THE TANK".
02/22/2012
20
HI114
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