AUX EL Series Betriebsanleitung PDF herunterladen (Seite 27)

09/11/2014 25 NI401

Additional Hookup or Special System Equipment Concerns

Additional Room Thermostat Connection Points

On the EZGEO board, upper left, are two optional control tabs – W2 and E-GAS. These can be used for

troubleshooting or emergency full output energy or with a conventional 2H/2C room thermostat. If the Geo

system has been sized to meet 100% of the heating load, it may be desirable to control the strip heat (if

equipped) at the thermostat. Configuring the thermostat to 2H/2C or 2H/1C and setting the AUX EL dial to

“Disable” allows the EZGEO control to function in this manner.

W2 – mode B, this conditions AUX EL all stages on.

• E-GAS – this conditions the system to standby or transfers the room thermostat W to gas furnace. This is

active for all modes, it should never be used for mode A when a gas furnace is not connected.

Note: The Y2 input has no function for this single stage model.

Special Oil Furnace Comment

This controller is designed to interface directly with a furnace fan center containing 24-volt transformer (40VA

or larger), blower relay, and a “W” function to operate the furnace. If this installation is for an oil furnace with

only oil control “T and T” terminals, a special fan center will need to be added with an isolation relay at the

“W” terminal so only isolated contacts are connected to the oil burner master control “T and T”. Another choice

is to order EE-5053 relay with accompanying HD001 instruction sheet.

Remotely Located Standby Override Switch

On the bottom of the board is an “SB SW” tab. Using an external switch between this “SB SW” tab and a

common tab provides the same function as the two-position system selector switch on the front of your EZGEO

control panel. In this configuration, either of these switches allows the homeowner to manually force the

HVAC system to utilize a fossil fuel system. A closure of the external switch is the equivalent to the system

selector switch being in the “up” or “standby” position.

Important note on cooling mode: To operate in cooling mode, neither of the switches can be in the

override position. Thus, the selector switch on your EZGEO control panel MUST be in the “down”

position AND the external switch must be in “heat pump” or “normal” position in order for the heat

pump to operate in cooling mode. If one or both of these switches are not the proper positions, cooling

will not occur.

Load Control, Other Products or Hardware

If there is a need to “pass on” the utility load control receiver function to other heating equipment, radiant floor

boiler, peak interrupter, etc; there is an isolated contact on the control board. Locate tabs COM/EL/SB. In the

electric mode, there is an isolated contact between COM and EL. This contact is for low voltage only, 1-amp

maximum.

Note: There may be a 1 or 2 minute delay between this relay contact action and the actual load control

receiver. This delay coincides with various blower purge functions.

Note: This contact also follows front panel standby switch and all other standby functions such as SOT-S,

etc.

Optional – NHP Geo Alarm

As shown on hookup drawing NH401, there are provisions for an external buzzer and LED device. When the

Geo HP declares a fault or dead compressor alarm, this device will sound an audible and turn on the LED light.

 The 2-wire hookup can be extended as much as 100 feet (30 meters), use 18 or 20 gauge wire.

 The audible can be turned off with the pushbutton. But if the system is not repaired within 4 hours the

audible will again sound.

 The LED light will continue until the system is repaired and power off reset.

 The system may recover on its own, but the LED will continue indicating there “was” a fault situation.

This LED is only turned off by a power off reset at the disconnect.

 Order part number R-AL-FD-1

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