AUX EL Series Instruções de Operação descarregar pdf (Página 39)

09/11/2014 37 NI401

EZGEO Bypass

Behind the front panel hinged door the various wires from the EZGEO board terminate on a Geo standard

terminology terminal block. If necessary to prevent building freeze-up, etc. the wires from the EZGEO board can be

disconnected from this terminal block and the room thermostat (or another heat pump type roomstat) can be

transferred to this terminal block to run the compressor/heat pump in an emergency mode.

- R to Y1 – compressor on and blower at full airflow.

- RV – can be left unterminated for heating (NHP concept design is reversing valve high during cooling)

- G – not needed.

- Fault – monitored output only, not needed.

Gas furnace only option, operating mode B, C, D – with EZGEO board disconnected, roomstat can go directly to

gas furnace W and appropriate blower terminals. This is assuming gas furnace has its own blower.

Front panel override switch – if mode is B, C, or D and gas furnace is active via EZGEO board with a potential

compressor problem (probably fault LED on) 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.

Alarm/Fault Active

The status LED and alarm output continue until power-off reset. The EZGEO system will attempt to maintain room

temperature or prevent freeze-up.

- Mode A – by definition, no backup, at each roomstat W cycle, compressor will retry.

- Modes B, C, D – with gas furnace standby roomstat W is transferred to gas furnace operation.

- Mode B, SW OVER = 0 – AUX EL will be active and do the heating.

- 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 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, it will simply cause

damage. Call for service.

Backup/freeze-up – the intent of modes B, C, D with either AUX EL or gas furnace is to prevent 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, C, D installation include gas furnace and/or AUX EL

module. If the system is setup in either B, C, D and there is no gas furnace and/or AUX EL freeze-up may still occur

because the roomstat is assuming a heat source which will bring up the temperature to satisfy the roomstat.

WARNING

WHEN CONFIGURED WITH A GAS FURNACE AND/OR AUX EL (MODES B, C, D) IT IS THE

USER’S RESPONSIBILITY TO HAVE CIRCUIT BREAKERS TURNED ON, GAS IN THE TANK,

GAS VALVES OPEN, AN OPERATIONAL GAS FURNACE, ETC. THE EZGEO CONTROLLER

CANNOT DETECT “NO GAS IN THE TANK”.

Overheat Plenum, Control Override

When AUX EL stages are not active, the ST sensor also controls compressor functions. This also prevents

compressor and gas furnace on at the same time (mode D/refrigerant coil in plenum).

- ST > 105° F (40° C) – compressor Y2 turned off

- ST > 112° F (44.5° C) – compressor off

Operation continues to the end of heat call cycle or if ST < 100° F (38° C) the compressor Y2 will re-energize.

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