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SEQUENCE OF OPERATION
COOLING –
Circuit R-Y makes at thermostat pulling
in compressor contactor, starting the compressor
and outdoor motor. The G (indoor motor) circuit
is automatically completed on any call for cooling
operation or can be energized by manual fan switch on
subbase for constant air circulation.
A 24V solenoid coil on reversing valve
HEATING –
controls heating cycle operation. Two thermostat
options, one allowing "Auto" changeover from cycle to
cycle and the other constantly energizing solenoid coil
during heating season, and thus eliminating pressure
equalization noise except during defrost, are to be used.
On "Auto" option a circuit is completed from R-W1 and
R-Y on each heating "on" cycle, energizing reversing
valve solenoid and pulling in compressor contactor
starting compressor and outdoor motor. R-G also make
starting indoor blower motor. Heat pump heating cycle
now in operation. The second option has no "Auto"
changeover position, but instead energizes the reversing
valve solenoid constantly whenever the system switch
on subbase is placed in "Heat" position, the "B" terminal
being constantly energized from R. A Thermostat
demand for heat completes R-Y circuit, pulling in
compressor contactor starting compressor and outdoor
motor. R-G also make starting indoor blower motor.
NOTE: MENU
JUMPER MUST
BE SET TO "ON"
TO CHANGE ANY
SETTINGS WITH
THE FRONT BUTTONS.
TO LOCK THE CO2
CONTROLLER MOVE
JUMPER TO "OFF" AFTER
IT HAS BEEN CONFIGURED
FIGURE 23
CO
CONTROLLER – FACTORY SET TO 950 PPM
2
High / Low Pressure control provides protection for
the compressor. In the event system pressures go above
600 PSI or below 15 PSI in either cooling or heating
mode, the compressor will be stopped. This will
activate the red light located in the control panel. The
lockout circuit will hold compressor off line. When the
system problem is corrected, the unit operation can be
restored by turning of the main power supply off and
then back on, or reset the room thermostat. The low
pressure control has a bypass to eliminate nuisance
lockout on cold start up.
The bypass timer should be set to 120 seconds and this
is to assure there is no nuisance tripping of the low-
pressure control during startup in heating mode under
cold weather conditions. See Defrost Control Board -
Figure 24.
PRESS UP AND DOWN
ARROWS TO ENTER
CONFIGURATION MODE
USE ARROWS TO SELECT
SETTING. PUSH MIDDLE
BUTTON TO CHANGE.
CONTROLLER WILL
SHOW SET.
Settings Recommended
Default
RON
1000
1000
ROF
950
950
DSP
C
CT
UNI
US
US
COL
Not Used
COH
Not Used
TOL
Not Used
TOH
Not Used
See Instrution with Controller
BAR
For High Altitude Installations
CAL
Used for Field Calibration
MIS-3326
Manual
2100-601B
Page
33 of 42
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Table of Contents
Troubleshooting
