In General; Receiver Tank; Refrigerated Dryer; Intercoolers - Sahara -Pak HC-1260 Instruction Manual

INSTALLATION DIAGRAMS

IN GENERAL

In order for the condensate to properly enter the Robo Drain
reservoir, the condensate line to the Robo Drain must al-
ways be installed below the bottom of the vessel to be
drained. It is equally important to provide a means for the air
that is contained in the reservoir to escape (vent) as the
condensate enters the reservoir. If the air can not escape,
the condensate will not enter the reservoir. Below are sug-
gestions on how to best install the Robo Drain on typical
types of vessels that have to drained of condensate. How-
ever, it is possible to install the Robo Drain without a bal-
ance line (Dwg. not shown), providing the condensate en-
ters the top inlet and the flow rates are less than 9 GPH
(750 cfm for an aftercooler or 1500 cfm drier) for a 1/2"
drain line and 19 GPH (1500 cfm for an aftercooler or 3000
cfm drier) for a 3/4" line. The use of unions and shut-off
valves are recommended for both the condensate line and
the balance line.

RECEIVER TANK

The preferred installation for a Robo Drain on a receiver
tank is having the condensate enter the top inlet port and
having the balance line go back to the tank at a position that
is above the level of the condensate (Dwg. 1).
FILTER and AFTERCOOLER MOISTURE SEPARATOR
If a cyclone separator or filter has pipe plugs located in the
top of the head, the plug closest to the discharge pipe
should be removed and the balance line should be installed
(Dwg. 2). If there is no provision on the cyclone separator or
filter for a balance line, install it in the discharge side of the
pipe line and as close to the cyclone separator as possible.

REFRIGERATED DRYER

If a balance line is required, it must be connected to the port
located on top of the separator that is closest to the dis-
charge side (Dwg. 2), or between the separator and the air-
to-air heat exchanger. If a port is not available as described
above, then venting to atmosphere is recommended. When
venting to atmosphere, the condensate should enter
through the bottom entry port on the drain. The bleed or
needle valve is installed on the 1/8" NPT vent port and al-
lows the air in the Robo Drain reservoir to escape to the
atmosphere (Dwg. 3). The bleed valve (not included) should
be adjusted so that only 3 to 5 bubbles per second are visi-
ble. We do not recommend installing a vent line down
stream from the dryer. The vent line can be a conduit for
transferring moisture from the drain to the previously dried
air. This can result in unwanted moisture being sent down
stream.

INTERCOOLERS

Install the condensate drain line into the upper port only.
This will prevent the possibility of condensate being drawn
back into the intercooler on some systems. It is important
that the vent line be installed on the same stage that is be-
ing drained or to atmosphere.
BALANCE LINE
As mentioned above, both the use and the placement of a
balance line is very important. Most drain failures are the
result of an improper balance line installation. The balance
line should be 1/4" tubing or larger, and installed on top of a
pipe or vessel, not the bottom. A needle valve is recom-
mended for controlling the air flow. Avoid having any loops
or low areas in the balance line that might allow moisture to
collect in the line and prevent the passage of air from the
drains reservoir.
Reference CS010 Rev 1
Page 4 of 4 11/15/2012