Emerson E2 Manuel D’Utilisation

When a zone is bypassed to ON, the main water valve 

will be turned ON immediately.

While each zone is bypassed to ON, a timer is checked. 

If time has elapsed equal to or greater than the zone’s 
cycle duration parameter, the bypass input will be ignored 
and the zone will return to normal operation.

For a zone in Bypass Failsafe, its bypass input must be 

set to OFF or NONE to reset the Bypass Failsafe and to 
use the bypass input again.

For both Timed and Volume control types, if a flow 

sensor is configured, water flow will be checked via a leak 
test that is performed at the beginning of the cycle. During 
the leak test the main water valve will be turned ON and 
all zone valves will be set to OFF. After an amount of time 
has elapsed equal to the Flow Alarm Delay, the Water 
Flow input will be compared to the Minimum Flow for 
Alarm setpoint. If the water flow is greater than the set-
point, the flow alarm output will be set to ON and a Leak 
alarm will be generated. If a Leak alarm occurs the cycle 
will terminate. While a Leak alarm is active, no normal 
cycles will run and the system status will be set to Leak 
Detected. 

A Leak alarm must be cleared by the user or the alarm 

will return to normal after passing a leak test run by a 
manual cycle. If an enabled zone is overridden to ON 
during a leak test, it will cause the test to fail, resulting in a 
false alarm.

When a zone becomes active during a cycle, a timer is 

reset. After time has elapsed equal to the flow alarm delay, 
the water flow input will be compared to the Min Flow 
alarm setpoint. If the water flow is less than the setpoint, 
the flow alarm setpoint output will be set to ON, an 
Obstructed alarm generated, and the zone will be removed 
from the current cycle.

The Service Check cycle allows a service technician to 

visually look for malfunctioning valves and leaks by 
cycling each zone ON one at a time, starting with the first 
zone. The active zone uses the Service On Time parame-
ter and remains ON for the programmable time period 
entered for Service On Time.

While in the Service Check cycle, any active irrigation 

cycles will be terminated. The Service Check cycle will 
continue looping until stopped by the user or the program-
mable value in the Suspnd Failsafe field is reached.

If the current space temperature is greater than or equal 

to the heat stage Cut Out setpoint, or the individual cool-
ing stage is currently ON due to a call for cooling (Cut In 
setpoint or dehumidification), and the current space tem-
perature is greater than the individual COOL stage Cut In 
setpoint, then begin turning the stage OFF by starting the 
heat stage Off Delay countdown timer.

Or if the current space temperature is less than or equal 

to the heat stage Cut In setpoint, begin turning the stage 
ON by starting the heat stage On Delay countdown timer.

If the current space temperature is less than or equal to 

the cool stage Cut Out setpoint, begin turning the cool 
stage OFF by starting the cool stage Off Delay countdown 
timer. If the current space temperature is greater than or 
equal to the Cut In setpoint, begin turning the cool stage 
ON by starting the cool stage On Delay countdown timer.

Dehumidification control is implemented on an AHU 

basis, not individual cooling or heating stages. Because of 
implementation on an AHU basis, dehumidification con-
trol is “woven” throughout the cool Cut In/Cut Out as well 
as the heating Cut In/Cut Out control algorithms by calling 
for increases or decreases in heating and cooling capaci-
ties. The dehumidification algorithm does not directly 
change the states of the heating or cooling, instead it 
“influences” the staging process by calling for more, less, 
or the same amount of cooling, and limit the amount of 
heat used if a call for heating is necessary during dehumid-
ification.

If the current space temperature is less than the dehu-

midification minimum space temperature, call for the end 
of dehumidification.

If the current control value used for dehumidification 

is greater than the dehumidification setpoint plus the dead-
band divided by two (2), call for an increase in dehumidi-
fication capacity.

If the current control value used for dehumidification 

is less than the dehumidification setpoint minus the dehu-
midification deadband divided by two (2), call for a 
decrease in dehumidification capacity.

To determine proper fan speed, determine which heat-

ing and cooling stages are ON and if the user has set any 
of the fan speeds for those stages to High. If any of the