4
III. Operation
A. Installation
1. Proper pretreatment must be determined and installed prior to
the RO system.
2. The water supply and pretreatment equipment should be suf-
ficient to provide a minimum of 20-psig at the maximum feed
flow.
3. An electrical receptacle with a ground fault interrupt (GFI) is
highly recommended.
4. Responsibility for meeting local electrical and plumbing codes
lies with the owner / operator.
5. Install indoors in an area protected from freezing. Space al-
lowances for the removal of the membranes from the pressure
vessels should be provided.
B. Plumbing Connections
Note: It is the responsibility of the end user to ensure that the
installation is done according to local codes and regulations.
1. Connect the pretreated feed water line to the inlet valve (Figure #
1 item J). A feed water shutoff valve should be located within 10
feet of the system.
2. Temporarily connect the product water outlet to a drain. The
product outlet is located on top of the product flow meter. The
product water line should never be restricted. Membrane and/or
system damage may occur if the product line is blocked.
3. Connect the reject water outlet to a drain. The reject outlet is
located on top of the reject flow meter. The reject drain line
should never be restricted. Membrane and/or system damage
may occur if the reject drain line is blocked. An air gap must be
located between the end of the drain line and the drain. The use
of a standpipe or other open drain satisfies most state and local
codes and allows for visual inspection and sampling.
4. If a bladder tank is used for product water storage then the
product pressure switch (Figure #1 item B) needs to be con-
nected. Install a tee and tube fitting in the inlet piping of the
bladder tank and connect the tank to the pressure switch using
poly tubing. A check valve should be installed between the RO
unit and this tee.
5. If an atmospheric tank is used for product water storage, please
cut off the plug and wire the float switch to the tank level input
on the controller when using this float switch with a Watts
Commercial RO system.
C. Electrical
Note: It is the responsibility of the end user to ensure that the
installation is done according to local codes and regulations.
1. Make sure the on / off switch is in the off position (Figure # 1
item A).
2. Plug the unit into a standard 120 volt 3 prong outlet. An outlet
protected with a ground fault interrupt (GFI) is recommended.
D. Startup
1. Verify that the pretreatment equipment is installed and working
properly. Verify that no free chlorine is present in the feed water.
2. Verify that the on / off switch is in the off position.
3. Install a 10" five micron filter cartridge in the prefilter housing.
4. Open the reject control valve completely (Figure # 1 item C) by
turning it counterclockwise.
5. Close the reject recycle control valve (Figure # 1 item D) com-
pletely by turning it clockwise.
6. Open the feed water shutoff valve installed in step III-B-1 above.
7. Move the controller on/off switch to the on position.
8. Allow the unit to run for 15 – 30 minutes to flush the preservative
from the membrane(s).
9. Adjust the reject control valves (Figure # 1 items C & D) until the
desired flows are achieved. Closing the reject valve increases
the product flow and decreases the reject flow. Opening the
reject recycle valve decreases both the reject and product flow.
See the flow rate guidelines and temperature correction table in
the appendix to determine the flow rates for different operating
temperatures.
Do not exceed 200psi on the pump discharge
gauge (Figure #1 item F).
10. Allow the product water to flow to drain for 30 minutes.
11. Turn off the system and connect the product line to the point of
use. The product water line should never be restricted. Mem-
brane and/or system damage may occur if the product line is
blocked.
12. Restart the system and record the initial operating data using the
log sheet.
E. Control Function
1. When the on / off switch is in the on position, the inlet valve
opens and the pump runs. If the product pressure switch is used
then the pump will cycle based on the product water pressure.
The switch is factory set to cut off at 40psi and cut on at 20psi.
Instructions for adjusting the cut off and cut on pressures are
located on the inside cover of the switch.
2. If the water pressure feeding the pump drops below 5psi for more
than 5 seconds, the pump will turn off and the amber light on
the control box will turn on. The controller will automatically reset
after 30 minutes and the pump will turn back on. Cycle the on /
off switch to manually reset a low-pressure shutdown.
3.
Autoflush –
This is a feature that provides increased reject flow
at startup and for 2 minutes every hour. The timer is prepro-
grammed at the factory and should not be adjusted.
WARNING
!
You will need to remove the factory installed jumper wire from
the tank level terminals in the controller.
Product Pressure Switch
/ Tank Level Switch
Small controller used on
PWR2511, PWRO440
& PWR4011
Figure 2
