TM 10-4610-215-10TM 08580A-10/1CAUTIONIf raw water hoses freeze, poor water flow will reduce pressure in R.O. pump.The R.O. PUMP LOW PRESSURE lamp will come on and R.O. pump will shutitself off. Bring hoses under cover until ice melts.NOTEThe ROWPU produces less product water when the temperature of raw waterdrops.b.When the ROWPU is shut down during cold weather (temperature falls below 32 °F (0 °C),remove the R.O. elements (para. 3-4) . Store the elements indoors or in a tent where the temperature is abovefreezing and allow them to dry. Drain all water from ROWPU as follows:Make sure drained water runs toward lower ground (downstream) as far fromthe raw water source as possible.(1) Drain ROWPU pipe, filters, and connections:(a) Open seven drain valves (para. 2-38).(b) Open five vent valves (para. 2-23 b).(c) Facing trailer from towing end, jack-up left side to permit maximum water drainagethrough drain valves.(2) Drain R.O. pump as described below:CAUTIONDo not operate R.O. PUMP JOG switch (42, fig. 2-4) for more than 5 seconds ata time. You will damage pump if you do.NOTEThe JOG switch can be used when the R.O. pump LOW PRESSURE lamp ison.(a) After water stops flowing out of drains, set R.O. PUMP JOG switch to JOG. Hold it therefor 3 to 5 seconds to force water from pump.(b) Repeat operation of R.O. PUMP with JOG switch until no more water comes from theDRAIN PULSE DAMPENER drain (fig. 2-39).(c) Disconnect plastic tubing from bottom of R.O. vessels so they can drain. Reconnecttubing when vessels are fully drained.2-96
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