Stulz CeilAir CW - Remote Temperature;Humidity Sensor; System Charging Procedures; Pump; Water;Glycol Systems

47OCH0006F08/13/2024
CEILAIR
®
CW & DX IOM
2.7.2.2 ATECH 1.2 PROGRAMMABLE THERMOSTAT
2.7.6.5 Remote Temperature/Humidity Sensor (E
2
)
The remote temperature/humidity sensor requires a shielded cable with the shield terminated at the unit
electric box. The number of conductors needed depends on which system controller is used. Three control
conductors are required for systems using an E² controller. Both the electric box and the sensor include a
terminal strip with box type lugs for wire connections. Refer to the electrical drawing supplied with your unit
for the number of conductors required and for the appropriate wire terminations.
NOTE National Electric Code Wiring
All wiring must be provided in accordance with National Electrical Code and local code requirements for
Class 2 circuits.
2.8 System Charging Procedures
2.8.1 Water/Glycol Systems
All self-contained water/glycol cooled units (those that require no refrigerant field piping) are factory charged
with refrigerant. No field refrigerant charging is required. The following precautions must be observed when
installing and filling the water/glycol loop:
1. The piping system must be cleaned prior to adding water/glycol to the system.
2. Glycol must be mixed with water before it is added to the system. All air must be bled from the pipe
system. Use only water/glycol solution with inhibitors for corrosion protection.
3. Open the vent valve at the highest point of the system.
4. Fill the system until the solution is discharged from the vent with minimal signs of foaming due to air in the
system.
2.8.1.1 Pump
If a pump is used, ensure the system is filled before turning the pump on. If the pump is not self-priming, it is
important that there is pressure at the suction inlet.
CAUTION
Do not run the pump when dry. Running the pump without liquid can damage it.
If the pump has no pressure on the discharge side, leave the discharge valve partially shut to create a back
pressure in the pump so that liquid can build up in the impeller housing to keep the impeller housing from
getting too hot. Make sure there is always liquid flowing through the pump to cool the impeller and housing. If
there is no liquid leaving the pump, shut the pump off immediately to prevent damage to the pump. Check for
proper rotation direction of the motor, observing the arrow on the side of the impeller.