7
General Installation Instructions
GEN II Controller
1. Install the
GEN II
controller on an interior wall where the ambient temperature is between 32°-
120°F (0°- 48°C) non-condensing. This controller is to be installed in an accessible interior
area; not in attics or above ceilings.
2. The controller is to be powered by a
dedicated
24vac 100va transformer. The transformer seco-
ndary is wired to
TR1 TR2
on the controller
(B).
The secondary voltage to the controller must be
3. Install the LAT air sensor in the supply air between the indoor coil and electric strip heat
elements.
4. The leaving air sensor (LAT) is calibrated to the controller at the factory. However, the
calibration should be checked as part of the system setup procedures. If adjustments are
required, use the Blue potentiometer labeled R44 located in the upper left hand corner of the
GEN II
controller. Screw the pot clockwise to lower the display temperature and counter -
clockwise to raise the temperature.
NOTE
: The display will update every 10 seconds.
Heat Pump operation “O” reversing valve
Cool Call – When a majority active cool call is received by the
GEN II
controller, Y1, O/B and G
LEDs are illuminated; and the outputs are energized (within 1.5 to 3 minutes). After 3 minutes, if
the leaving air temperature is 58°F (14°C) or above, Y2 will energize for 2-stage systems. Y2 will
de-energize when it drops below 50°F and re-energize when it rises above 58°F. If the supply air
temperature drops one degree below the Cool cut-out temperature, Y1 and Y2 will de-energize
“B” reversing valve – Sequence of operation is the same: O/B is energized in the heat mode.
Heat Call - When a majority active heat call is received by the
GEN II
controller, Y1 and G LEDs are
illuminated; and the outputs are energized (within 1.5 to 3 minutes). If after 3 minutes the leaving
air temperature is 94°F (34°C) or less, Y2 will energize. If after 6 minutes of run time the leaving air
temperature is 91°F (32°C) or less, W2 will energize. If the supply air temperature exceeds 126°F
(52°C), Y1, Y2 and W2 (if energized) will drop out; and Y1 can then energize after a 5-minute time
delay. NOTE: If the system fan is configured for “AUTO” on the
GEN II
controller, the “G” output
will be de-energized in the temperature cut-out mode.
When the last active call satisfies, the
GEN II
controller goes into a 5-minute purge cycle with all
supply dampers closing; then all dampers modulate open for ventilation.
GENERAL INSTALLATION INSTRUCTIONS
5. Confirm you have connected the
A
and
B
communication wires and
TR1
and
TR2
from the
thermostats to the Gen II controller (
A & L
), A=(TR1, TR2), L=(A, B). (Communication wire
maximum is 4,000 ft. from the Gen II controller to the farthest EzTouch).
6. Connect the output wires from the controller to the HVAC system using standard 18 GA
thermostat wire.
The LAT sensor leads may be extended using standard 18/2 thermostat wire.
for 5 minutes.
Heat Pump operation “B” reversing valve
By placing the O/B jumper (B) on both pins, the
GEN II
controller is configured for “B” reversing
valve operation. The operation and setup procedures are the same as with “O” mode reversing
valve, except the reversing valve will be energized for heat operation.
24 to 28vac.
DO NOT ground out the transformer
.
