Diagram Water System New Eng

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Note on valves: The “open” and “closed” are the normal operating states for the water system. Follow the arrows in diagram.

OPEN CLOSED

DO NOT EVER BYPASS THIS VALVE UNLESS A CARBON FILTER IS IN #2 FILTER HOLDER!!!!

A

OPEN

CARBON BED Never bypass!!! Unless a carbon filter is installed into #2 filter housing. It removes the chlorine from the tap water so DI tanks are not damaged by the chlorinated water.

For metal valves, DOWN is closed and horizontal is OPEN.

OPEN

Carbon bed backflows and flushes itself once a day in the early morning.

CLOSED

CLOSED

C

B #1 Filter

OPEN

From backflow preventer valve. This valve is tested by Physical Plant once a year.

Flow Meter OPEN

OPEN

Changing Filter #1 (every 6 months) 1. Open A to bypass filter. 2. Close valves B and C to isolate filter. 3. Press RED button on filter housing to depressurize. 4. Remove filter housing and replace filter with 10-inch 5-micron filiter. Have a bucket to collect water. 5. Close fiilter housing and slowly open B while holding down the red button. 6. Once water comes through RED button open C. 7. Close A.

NOTES: 1. #1 Filter should have pressure drop of <5-lbs more or less. 2. City water pressure should be from 40 to 45-lbs. May see as low as 28 to 35-lbs. 3. Change #1 Filter every 6 months minimum.

DI WATER SYSTEM NEW ENGINEERING BLDG ROOM 241

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From Recirculated H2O from labs.

OPEN

Recirculating Pump Check Valve (keeps flow in one direction)

CLOSED

OPEN

T O

OPEN OPEN

L A B S

UV Lamp This reduces the bacteria in water. (Replace every year.)

Pressure Switch

If this valve is bypassed, water no longer treated through RO unit and goes directly to DI tanks.

Valve (orange handle)

From Carbon Bed (PAGE 1)

CLOSED

OPEN

Pressure Switch

RO Unit De-ionization tanks (replace every 6 months). An alarm on first tank will beep and the red light turn on if tank needs replacement. This does not mean both tanks are bad.

Pressure Tank (50 gallon)

NOTES: 1. #2 filter can be replaced with a carbon filter should large carbon bed unit malfunctions. 2. If a DI faucet is left on, the pressure tank can be emptied and it may appear that there is no DI water. Check all lab faucets first. 3. If the water line has little or no water, the recirculating pump will automatically shut off. 4. On occasion, the recirculating pump turned off because the relay inside the control box tripped. Call physical plant for assistance. 5. The DI tanks are rented from the vendor under current contract.

DI WATER SYSTEM NEW ENGINEERING BLDG ROOM 241

E

F OPEN

#2 Filter

OPEN

Changing Filter #2 (every 6 months) 1. Unplug RO unit even if it is on. 2. Close valve E and allow pressure to decrease to 0-lbs. It is possible to disconnect RO unit to expedite pressure decrease. 3. Once pressure is down to 0, close F and tighten loose connection to RO unit. 4. Remove filter housing and replace filter with 10-inch 5-micron filiter. Have a bucket to collect water. 5. With F closed, slowly open E while holding RED button down to release air. 6. Once water comes out at RED button, open F all the way.

Notes on RO Unit: 1. While operating, should see between 180 to 200-lbs of pressure consistently. 2. If >200-lbs, filter may be plugging. If <150-lbs, RO unit may need adjustment. Call for repair. 3. Motor may become hot while refilling pressure tank from empty and has thermal override. 4. RO unit make about 5 gallons/hour. 5. If RO unit fails, call for repair. 6. RO filters probably need replacement about every 2 years or so. 7. RO unit has valve with a RED handle; open valve to flush RO filter about once week. 8. RO system can be bypassed, but will decrease life of DI tanks.

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