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Honeywell VP522A, Quick Start Manual, Page: 4 / 8

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Honeywell VP522A Quick Start Manual Download Page 4

 B SEQUENCING WATER VALVE

TROUBLESHOOTING

For troubleshooting the 

 or B, see Figure 2.

YES

REPACK VALVE AND

INSPECT INTERNAL

PARTS. REPLACE BENT,

BROKEN, OR WORN

PARTS

RESTORE VALVE/SYSTEM

TO OPERATION

I

YES

CHECK ACTUATOR

YES

REPLACE

DIAPHRAGM.

MAKE

OPERATIONAL

CHECK.

YES

CHECK

SYSTEM

PRESSURES

DISASSEMBLE VALVE AND

INSPECT FOR FOREIGN MATERIAL

OR BLOCKED PORTS. CHECK FOR

BROKEN PARTS. CLEAN AND I

REPLACE AS NECESSARY.

DISASSEMBLE VALVE.

REPLACE WORN SEATS

AND PLUGS. REPLACE

VALVE IF LOWER SEAT IS

DEFECTIVE.

YES

DISASSEMBLE VALVE.

INSPECT FOR FOREIGN

MATERIAL OR BENT STEM.
CLEAN OR REPLACE STEM

AND LUBRICATE.

RESTORE VALVE,’

SYSTEM TO
OPERATION

I

Fig. 2. VP522 Troubleshooting Flowchart.

Summary of Contents for VP522A

Page 1: ...ortioning valve that controls the flow of first hot and then cold water to a fan coil unit as branchline pressure increases and the reverse as branchline pressure decreases No flow occurs at mid pressure See Table 1for operating sequence The VP522B diverts the return water from the coil directly to return piping of the system feeding the coil During the dwell period of the VP522A when both ports a...

Page 2: ...pens Cold port open 100 Specifications See Table 2 for VP522 model number size capacity index and close off rating Table 2 VP522 Specifications Not available for replacement Use valve with different nominal pipe size and same capacity index T Not available for replacement Use valve with different capacity index 5 Rating will maintain closure against 15 psi 103 kPa difference in return line pressur...

Page 3: ...ome into contact with the diaphragm as it will cause serious damage 0 0 Adjust the system temperature controller through its control range The valve should operate to control the flow of water as required to provide heating or cooling when both hot and chilled water are available Make sure the branchline pressure builds up to near full main pressure when controller is set at the extreme end of the...

Page 4: ...LACE DIAPHRAGM MAKE OPERATIONAL CHECK I YES CHECK SYSTEM Pr PRESSURES DISASSEMBLE VALVE AND INSPECT FOR FOREIGN MATERIAL OR BLOCKED PORTS CHECK FOR BROKEN PARTS CLEAN AND I REPLACE AS NECESSARY I DISASSEMBLE VALVE REPLACE WORN SEATS AND PLUGS REPLACE VALVE IF LOWER SEAT IS DEFECTIVE 1 YES DISASSEMBLE VALVE INSPECT FOR FOREIGN MATERIAL OR BENT STEM CLEAN OR REPLACE STEM AND LUBRICATE IRESTORE VALVE...

Page 5: ...followers from packing nut Retain both packing followers Discard old packing Remove packing spring from valve bonnet Clean out packing nut and packing spring with a commercial solvent degreaser AWARNING Use solvents in a well ventilated area Avoid prolonged inhalation of solvents or contact with the skin Careless handling of solvents can cause permanent injury to the respiratory system and skin ti...

Page 6: ...VP522A and B Parts List See Fig 3 Fig Key No Part No Description 2 3 4 4 5 6 7 a 9 10 10 10 10 11 12 13 14 15 16 17 17 1 8 19 20 21 22 23 23 314456 23 314462 24 See Table 4 Stem and Disc Holder Assembly 25 Valve Body 312760 309 zlo4 313816 00063 314436 00065 315412 315413 314460 315409 310143 310137 310135 313825 Screw 8 32 x 1 2 in slot head 4 Lockwasher No 4 4 Actuator top Diaphragm 1 Diaphragm ...

Page 7: ...E ACTUATOR ASSEMBLY 312817L ALL A MODELS EXCEPT Al 039 A1047 AND Al237 312817S FOR A1039 A1047 AND Al237 MODELa 312817W FOR 81003 MODELS 312817Y FOR B1011 AND B1029 MODELS X2053 1 Fig 3 VP522A and B Exploded View SeeTable 3 75 2598 ...

Page 8: ...me and Building Control Honeywell Inc Honeywell Limited Honeywell Limitee Honeywell Plaza 740 Ellesmere Road P O Box 524 Scarborough Ontario Minneapolis MN 55408 0524 MlP 2V9 Helping You Control Your World 75 2598 Rev 6 92 Printed in U S A ...

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