AJAX PVG WW, Operating And Maintenance Manual

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ACE BOILER INC.
Page 14
Trouble-shooting Guide
a
Water temperature too high
1 Check the setting of the pilot controller and adjust the hand wheel as necessary.
2 Confirm steam supply pressure to the valve does not exceed that specified in the List of
Materials.
3 Bad sensing element.
4 Check bleed port for proper orifice fitting (No. 4A) and/or plugging.
5 Check for dirt under valve seats.
6 Valve disc is worn.
b
Banging or pinging
1 Check steam traps for proper operation.
2 Check for proper condensate drainage. Clean out all dirt and debris.
3 Check for back pressure in the condensate line.
c
Erratic temperature control
1 Make sure the circulator pump is pumping.
2 Check for proper direction of the circulator pump. The pump should be flowing from the tank
to the nozzle neck.
3 Check steam traps for debris and proper operation.
4 Confirm steam supply pressure to the valve is steady and agrees with that specified in the
List of Materials.
5 The hand wheel on the pilot controller needs adjustment.
6 Check the control temperature bulb for exterior scale or build up and clean if necessary.
7 Check for debris in pilot and valve.
d
Poor recovery
1 Check the setting of the pilot controller and adjust the hand wheel as necessary.
2 Confirm steam supply pressure to the control valve meets that specified in the list of
materials. Check for a clogged strainer, a partially closed supply valve or other obstructions.
3 Make sure the packaged storage water heater is not trying to supply more hot water than it
was designed for. (See performance listed in List of Materials).
4 Check to make sure that the proper bleed port orifice fitting (No. 4A) is on the unit. (See the
pilot Technical Data Sheets enclosed).
5 Check for plugging of the control pipe and the orifice in the No. 5A restriction flow elbow.
6 Check the steam trap for any foreign matter and functionality.
7 Main valve diaphragm may be broken. Test with air or water before dismantling.
8 Shut unit down, remove bonnet and coil. Inspect for scale and fouling, which restrict heat
transfer. Clean with an approved chemical treatment
e
Control valve not closing
1 Check the setting of the pilot controller and adjust the hand wheel as necessary.
2 Confirm steam supply pressure to the valve does hot exceed that specified in the List of
Materials.
3 Check bleed port No. 4A for proper orifice fitting and/or foreign matter.
4 Check the thermostatic sensing element for kinks & operability.
5 Main valve or pilot may be held open by foreign debris.
6 Valve disc is worn.