Culligan M1 Series Installation, Operation And Service Instructions page 43

Prepare the Equipment for Cleaning
1. Turn the unit power off.
2. Place the solution tank on the tank stand. Connect the tubing to the cleaning adapter then place the other end
of the tubing at the bottom of the solution tank.
NOTICE The tubing length should be as short as possible to prevent excessive pressure drop. Cut the tub-
ing as required to minimize the length.
3. Remove the product tubing from the service connection and place the end in the solution tank. The concentrate
tubing should still be directed to drain.
4. Replace the Pre-filter cartridge.
5. Apply power to the unit, and then press the RUN NOW button.
6. Fill the tank with 30-40 gallons of RO product water.
CAUTION! DO NOT turn on the RO system unless water can flow from the product and waste
lines.
NOTE Soft water is an acceptable substitute for RO water. When the solution tank is filled, direct the prod-
uct tubing to drain. Next, open the pump system pressure control valve until the system pressure is
approximately 50 psig.
7. Turn the unit power off. Remove wires from terminals 3 and 4 (Pressure switch) and install a jumper wire
across those two terminals.
8. Open the cleaning valve to allow feed water to displace air in the cleaning tubing, then close the inlet water
shutoff valve.
Step 1: Clean the Unit
1. Apply power to the unit, and then press the RUN NOW button.
CAUTION! If the pump is noisy, cavitation is occurring and the pump will be damaged. Turn the
power switch OFF and check for any obstructions to flow. Reduce the pump pressure
as required to prevent cavitation.
2. Record the pump pressure and measure the product water flow at low pressure. This flow will be used to esti-
mate if cleaning has been successful. Turn the unit power off.
3. Add enough acid to the solution tank until the pH is between 2.0 and 2.5.
NOTE If the foulant to be removed is silt or a biofilm, use phosphoric acid.
WARNING! Acid and Sodium Hydroxide are strong chemicals that must be handled carefully to
avoid injury. Wear protective clothing and have a source of water nearby to flush any
spills.
CAUTION! Local codes may prohibit the discharge of acid and caustic solutions to drain. If
necessary, an extra tank can be used to neutralize the solutions before discharging to
drain.
4. Apply power to the unit, and then press the RUN NOW button. After approximately 5 gallons have been drawn
from the solution tank, turn the unit power off.
5. Allow elements to soak for 15 minutes. Apply power to the unit, and then press the RUN NOW button. Draw
another 5 gallons from the solution tank. Turn the unit power off.
Cat. No. 01022940
Service and Maintenance 39