
09/11/2014 21 NI401
EZGEO Controller
EZGEO Features
Review attached HC112 HELPS document which lists the various characteristics and capability of this
controller product.
Application
The EZGEO controller is standard on all Northern Heat Pump models. For this model, the controller is designed
to run under 1 of 3 different operating “modes”.
Basic water to air packaged unit – mode A
Basic water to air packaged unit with added gas furnace – mode C
Basic water to air packaged unit with Electro Industries’ WarmFlo
®
strip heat and gas furnace – mode B
Factory default – mode A and SW OVER = Ø
When shipped with factory installed strip heat, factory settings are set to Mode B and SWOVER = Ø
WARNING
IF THERE IS NO AUTOMATIC STANDBY (GAS) OPERATING FROM THE EZGEO FURNACE TB-W,
THE SW OVER DIAL SWITCH MUST BE SET TO Ø POSITION. THIS STATEMENT RELATES TO
MODES B, C, AND D. ONCE THERE IS A LOGIC TRANSFER TO SB, THE FURNACE MUST FINISH OUT
ROOMSTAT-W. THUS THERE IS NO FURNACE OR NO HEAT THE SYSTEM WILL BASICALLY BE
LOCKED UP WAITING FOR HEAT ENERGY TO SATISFY THE THERMOSTAT.
Room Thermostat
This is general hookup information, before proceeding review next section – EZGEO Controller – to determine
the operating mode for this particular application.
Use conventional (not heat pump with O and compressor Y) heat/cool. This controller is designed to operate
from a basic 1H/1C thermostat. 2H/2C can also be used. See next section for comments relating to W2 and Y2
from the thermostat.
The thermostat can be mechanical, digital, power robbing, battery operated, setback, etc. If required, set heat
anticipator to 0.2. If electronic/digital stat, setup may ask for “cycles per hour”. As with most heat pump
products, the efficiency of your Northern Heat Pump relates directly to long run times. We recommend a small
number of cycles (2 cycles per hour).
Note 1: Do not (even with heat pump) use a heat pump thermostat.
Note 2: If programmable roomstat has external sensors, make sure setup is for display monitor only and
any programming for these sensors that has to do with interrupting any output functions, ODT,
auxiliary, setback, etc. are not active or program disabled.
Note 3: A high quality digital thermostat (part number 5021) is available from Northern Heat Pump
which has been pre-programmed to match the requirements of this unit. See the Accessories list later in
this manual.
Connect the standard R, W, G, and Y (and W2 and Y2 in the case of 2H/2C) stat terminals to the control board
upper left terminal block. If the specific roomstat requires common or C, this can be picked up from a tab on the
board bottom right. See NH401.
NOTE
The installer must be familiar with the manufacturer’s low voltage wiring terminology, screw terminal
terminology/colors, etc. This manufacturer’s terminology must be related to Northern Heat Pump’s
screw terminal identification within this controller. The intent of this instruction manual is not to train
each installer on the terminology related to the specific product you are installing.
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