Stulz CeilAir CW - Condensate Drain Line; Gravity Drain; Piping for Chilled Water, Water;Glycol, and Hot Water Reheat

36 OCH0006F08/13/2024
CEILAIR
®
CW & DX IOM
2.6.2 PIPING FOR CHILLED WATER, WATER/GLYCOL, AND HOT WATER REHEAT
2.6.2 Piping for Chilled Water, Water/Glycol, and Hot Water Reheat
The piping connections for water/glycol, chilled water, and systems with hot water reheat are sweat
connections. Pipe sizes may not necessarily be the same as the unit connection. Piping should be sized to
match the required system pressure drop and pump capacity (if applicable) and may require reducing fittings
to match the connection size on the air conditioner.
CAUTION
Fluid coils and associated piping circuits are pressurized and sealed when they leave the factory. When
installing and filling water/glycol, chilled water, and optional hot water reheat loops, all air must be bled
from the piping system.
CAUTION
The piping system must be flushed prior to operating the system. Failure to do so will result in equipment
problems.
The recommended ethylene glycol solution ratio is 40% glycol to 60% water. STULZ recommends
Dowtherm SR1 manufactured by Dow Chemical Co. Piping should be insulated on glycol-cooled systems
with a low entering fluid temperature and all chilled water systems.
WARNING
Glycol is hazardous. Review the manufacturer’s SDS before use.
A strainer should be included in the water/glycol, chilled water, and optional hot water reheat lines. Once the
system is operational, the fluid runs through the strainer, which removes any foreign objects. The strainer
screen should be cleaned periodically.
2.6.3 Condensate Drain Line
2.6.3.1 Gravity Drain
A 7/8 in O.D. copper (sweat type) line is provided to drain the condensate drain pan. This line also drains the
humidifier, if applicable. A “P” type condensate trap must be installed. The height of the trap must be at least
2 in to exceed the total static pressure of the system and ensure proper water drainage from the drain pan.
The drain line must be located so it will not be exposed to freezing temperatures. The drain line should be the
full size of the connection. See the installation drawing provided with your unit for the size and location of the
condensate drain line.
CAUTION
Do not use chloride-based water conditioning additives in condensate drain pans. They cause corrosion
on the coil fins.
CAUTION
Properly size and vent the P-trap according to applicable codes and best practices.