STULZ CyberRow Chilled Water Series Installation, Operation & Maintenance Manual
(
Dec.
, 2013)
4-7
01/01/09 00:00:00
00.0°F
00%rh
dp 00.0°F
Unit On
Main Screen
3. If the status message "
OFF- Manual Restart Req
"
appears instead of "
Unit On"
, the Automatic On feature
may not be enabled. In this case turn the air conditioner on
by pressing the
Enter (
) key.
NOTE
You may turn the A/C unit on and off at anytime by
pressing and holding the Enter (
) key for 3 seconds.
Other status messages that may appear at the bottom of
the screen are:
"
OFF by remote shutdown
"
-
Indicates the Remote
Start/Stop feature is enabled and requires a remote start
switch to be turned On.
"
OFF by Network
"
-
Indicates the unit is part of a
group and is off due to a grouping priority command such
as a compressor alarm or loss of airfl ow
or,
the BMS communication feature is enabled and the unit
received a network signal to pause operation.
"
OFF by Internal Alarm
"
-
Unit is off due to a
group alarm condition. (Only active with grouped units.)
"
Unit on CL Lockout
"
-
This indicates cooling
has been locked out while there is a demand for
dehumidifi cation because the temperature is below the
minimum temperature allowable for dehumidifi cation
(factory default setting is 4°F below setpoint).
4. After the initialization period expires, the controller
enables the control output to the CW valve and signals it to
open. Following a 45 second time delay (to allow the valve
to fully open) the fans are allowed to begin operating.
5. The STULZ logo in the display is replaced with a blower
symbol. The fans begin operating in stages with fi ve
second time delays. The middle fan starts fi rst, then the
upper fan, then the lower fan.
6. Following a 45 second time delay (after the fi rst
fan turns on) the controller polls the air proving switch.
If adequate airfl ow is detected, the controller begins
proportionally controlling the output signals to perform
cooling, humidifi cation and dehumidifi cation as defi ned by
the system confi guration. If there is no call for cooling at
that time, the CW valve is returned to the closed position.
CW Valve
Time Delay
Air Proving
Time Delay
45 sec.
45 sec.
Fans
1
3
2
5s 5s 5s
7. The controller records the date and time power is re-
initialized in the alarm history log.
8. If the actual room conditions are not within the
range of the programmed set points, the system will
begin operating in the mode(s) needed to reach the set
points (cooling, humidifying or dehumidifying). Symbols
(shown below) appear in the display to indicate the active
operating modes.
= Fan On
=
Humidifying
=
Dehumidifying
/
= CW Coil Flush Cycle On
9. Temperature and humidity alarms are masked out for
30 minutes to allow for conditions to stabilize without
triggering nuisance alarms.
10. Operator interface to the menu loops is available
from the Main screen by pressing the Program
(
Prg
)
key.
The controller starts a timer whenever a key sequence is
initiated. Every time a button is pressed, the timer is reset.
If there is no key activity for 60 seconds, the controller will
return to the Main screen unless the Screen Lock feature is
enabled in the Information menu loop (see page 4-16).
