Shellab SCO26H-2 - Manual (Page 6)

3.6 Humidification Water Supply: On the back of the body there is a 1/4" compression fitting
marked WATER IN. This fitting should only be plumbed to a DISTILLED WATER supply
source. Please note that when attaching the water supply line to the fitting on the unit, two
wrenches must be used: one to hold the fitting from turning in the panel, while using the
other to tighten the compression fitting. The supply source should be gravity fed or
pressure can be regulated to no more than 2 psi with a water pressure regulator valve.
Deionized or tap water should NOT be used. They will have a detrimental effect on
the unit causing corrosion or obstructions and premature failure of this assembly,
and VOID your warranty.
3.7 Fill the Vapor Generator: It takes approximately 880cc (0.88 Liter) to initially fill the vapor
generator, after that a continuous supply is required to maintain the operating level. If the
supply is disconnected or in some other manner cut off from the vapor generator, the level
will drop and the float switch in the vapor generator will shut the vapor generator off and the
low water indicator light on the front panel will be lit.
3.8 Water Drain Line: On the external back of the test chamber, at the bottom, there is a
copper drain line for excess condensation to drain from the bottom of the chamber. Ideally,
this line would be run into a floor drain, but could be run to a shallow pan with an automatic
sump pump. Under no circumstances should this line be plugged. If the line is plugged the
condensation will pool on the floor of the test chamber and flow out when the door is
opened.
3.9 Vapor Trap: Located in the water drain line, this trap consists of a solenoid valve
controlled by a timer. The timer is set to open and allow condensate to be removed from
the unit on a regular basis. This will prevent the chamber humidity and CO
2
from escaping
and still allow any condensation to drain away.
3.10 Pressure Relief Valve: Marked RELIEF, this valve is located just to the right of the
WATER IN fitting at the back of the unit. It provides pressure relief for the vapor generator
system. The cracking pressure is 5. psi. The protective shipping cap must be removed
before operation as this valve should never be plugged or covered.