ACE BOILER INC.
Page 16
the case the sensitivity screw needs adjustment or the air passage is clogged. Under normal
operating conditions the outlet gauge reading will fall within this range.
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 Mini-Pack is not trying to supply more hot water than it was designed for (See
performance listed in List of Materials enclosed).
4. Check the union orifice plate and auxiliary steam trap(s) for any foreign matter and
functionality.
5. Shut unit down, remove bonnet and coil. Inspect for scale and fouling, which restricts proper
heat transfer. Clean with an approved chemical treatment as necessary.
5. Control Valve not closing:
1. Check the setting of the Accritem and its sensitivity screw (and positioner if provided), and
verify a steady
30 PSI air supply pressure to the Accritem. The outlet pressure gauge on the
Accritem should read 30 PSI when fully opened, and 0 PSI when fully closed. To achieve full
shut-off, it is imperative that the outlet pressure gauge reads 0 PSI. If this is not the case the
sensitivity screw needs adjustment.
2. The packing gland assembly is too tight, locking the valve stem (See Technical literature
enclosed).
3. The temperature stem nut assembly is raised too high (See Technical literature enclosed).
4. Check for proper operation of the control valve solenoid. The solenoid should be energized
and open when the system in normal operating conditions. When the system is off or an
over-temp condition occurs, the solenoid should be de-energized and venting air out of its
third port.
5. Check for and clean out, any debris in the upstream strainer, valve body, and valve seat.
The valve seat may be worn or damaged and unable to seal properly (See Technical
literature enclosed).
6. Zeroing the Powers Actuator: The actuator spring tension has been factory set. If the valve is
leaking steam, the actuator spring range requires adjustment. Follow the steps below and refer to
the manufacturer's Technical instructions enclosed for more explicit direction.
To decrease spring tension on normally closed assembly.
1. Apply air pressure to the actuator to place the valve at "mid-stroke".
2. Hold the actuator stem in place and loosen the valve stem locknuts. Do not turn the
actuator stem at any time during this process as this may damage the diaphragm.
3. While holding the actuator stem in place, turn the valve stem into the actuator stem
(towards the actuator) to the desired position (1/4 to 1/2 turn each time) using the
locknuts. Retighten the locknuts when finished.
To increase spring tension on normally closed assembly.
1. Apply air pressure to the actuator to place the valve at "mid-stroke".
2. Hold the actuator stem in place and loosen the valve stem locknuts. Do not turn the
actuator stem at any time during this process as this may damage the diaphragm.
3. While holding the actuator stem in place, turn the valve stem out of the actuator stem
(away from the actuator) to the desired position (1/4 to 1/2 turn each time) using the
locknuts. Retighten the locknuts when finished.
For other trouble shooting issues, please reference the specific control sheets included in this manual.
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