CyberOne EC CW IOM Manual
19
4.4
Field Service
NOTE
Do not attempt to make repairs without the proper
tools.
4.4.1
CW Leaks
A leak in a chilled water cooling system will usually form an
obvious puddle of fluid beneath the unit. To locate the point
of leakage, visually trace the leak up from the puddle to the
area on the unit where fluid is seen dripping.
4.4.1.1 CW Leak Repair
When a leak is detected, properly reclaim the remaining CW
coolant before attempting repairs. Adjacent piping must be
thoroughly cleaned by removing all paint, dirt and oily film.
Use a wire brush, sandcloth or sandpaper and wipe the area
with clean, dry cloths. Protect nearby parts from heat
damage by wrapping with water-soaked cloths.
For copper-to-copper (piping) repairs use SILFOS Alloy. No
flux is required with Silfos Alloy. Silver solder (Stay Silv #45)
and flux should be used on copper-to-brass or copper-to-
steel repairs.
When repairs are completed, remove all traces of flux. After
any repair, check for leaks prior to recharging the system.
4.4.2
Humidifier Cylinder Replacement
After an extended period of operation, the yellow LED on the
humidifier cabinet will repeatedly flash four times indicating
that the cylinder is completely used and a replacement
cylinder must be installed. The cylinder is disposable and
cylinder life is dependent on water supply conditions and
humidifier usage. Use the following procedure to replace
the cylinder.
CAUTION
Failure to replace the cylinder at the end of cylinder
life may result in humidifier damage.
NOTE
Decrease the humidity set point below actual
conditioned space humidity to allow the cylinder
to cool down prior to removal.
1.
Turn the unit off, preferably in a manner that uses the
controller, such as via BMS or the controller terminal.
2.
Turn off the water supply to the humidifier using the small
manual ball valve (in the unit skid, under the compart-
ment where the humidifier is located) that tees off the
main water supply.
3.
Enter the cabinet section that houses the humidifier and
drain the humidifier cylinder by toggling the ON/OFF/
DRAIN switch on the humidifier to DRAIN.
4.
Allow the cylinder to completely drain then turn the hu-
midifier off by toggling the ON/OFF/DRAIN switch on
the humidifier to OFF.
5.
Exit the cabinet and turn off main power using the
through-door disconnect switch on the door of the Unit
Control Box.
6.
Follow the steps of the cylinder removal, drain valve
cleaning and cylinder installation procedures in the
humidifier installation and operation manual, which was
provided under separate cover with your unit.
7.
Close up the cabinet and turn main power on using the
through-door disconnect switch on the door of the Unit
control box.
8.
Open the manual ball valve that was closed in Step 2.
9.
Turn the unit on and readjust the humidity set point.
If the humidifier is to be shut down for an extended period,
follow the steps of the Extended Shutdown procedure in the
Nortec MES2 Installation and Operation Manual.
CAUTION
Failure to perform the recommended Extended
Shutdown procedure before a prolonged shut-
down period will drastically shorten cylinder life.
4.4.3
Air Filter Replacement
To change the air filters, open the front doors of the cabinet.
The air filters are accessed from inside the cabinet (except for
upflow units with rear return). For upflow units, the filters are
located behind the air intake grilles. For downflow units, the
filters are located at the top where the label “FILTER ACCESS”
appears. Remove the old filters from the trays. Insert the new
filter(s) ensuring the directional airflow arrows on the filters
are correct, then close the front doors.
