Ace Heating Solutions Mini-Pack, Инструкция по эксплуатации и техническому обслуживанию

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ACE BOILER INC.
Page 13
5. Plant steam is used as the heating medium and is controlled by a pneumatic control valve, which in
turn receives its signal from the temperature controller (Accritem). Connect the air supply to the
filter/regulator (minimum 35 PSI supply to the air pressure regulator). The instrument air supply
gauge on the pressure regulator should be regulated to 30 PSI to the Accritem. If the control valve
is equipped with a valve positioner these pressures will still apply. The outlet pressure gauge on
the Accritem should read 30 PSI when fully opened, and 0 PSI when fully closed. Under normal
operating conditions the outlet gauge reading will fall within this range.
6. Set the temperature knob on the Accritem (figure 2.2) to its lowest temperature setting.
7. Turn on the system by turning the control panel switch to the “ON” position (The manual steam
supply valve should be closed at this time). The green light should come on. At the same time, it
will energize the solenoid on the control panel allowing air to the control valve actuator, which in
turn will open the control valve. Make sure the circulator pump is running. (Please refer to the
pump instruction manual for details.)
8. Turn on a number of hot water fixtures to establish a steady 50% load if possible, with at least a
flow of 8 to 10 GPM for the initial startup. Make sure these stay on and there is not an additional
load applied elsewhere during initial startup.
9. Manually open the main steam shut-off valve upstream of the control valve and SLOWLY allow
steam to pass through the control valve. Continue until the shut-off valve is 100% open.
10. The Mini-Pack will now function automatically, reacting according to demand fluctuations and will
stabilize once limits are met.
11. Slowly increase the system temperature output by adjusting the temperature knob on the Accritem
(figure 2.2). Watch the temperature gauge on the front of the unit and wait for the temperature to
stabilize prior to turning it up again. Repeat this procedure slowly until the desired outlet
temperature set point has been achieved. Please note that the temperature knob on the Accritem
may not be accurate to the actual water temperature (see gauge on shell). Once you have
achieved your set point, it is recommended to loosen the set screw on the knob and reposition as
necessary to indicate the actual (gauge) temperature on the Accritem face plate.
12. Once stabilized, turn off the hot water fixtures one at a time and watch the temperature gauge on
the unit. There should only be slight temperature fluctuations. With no hot water fixtures on, the
temperature gauge should remain stable. Watch the temperature for 5 minutes to verify the steam
valve has closed. If the temperature slowly creeps up, the valve is leaking steam and may have
debris on the seat or the valve requires "zeroing". "Zeroing" the valve requires adjusting the stem
length until the valve closes tightly.
See Page 15 under Trouble Shooting.
13. With the system warm, check the operation of the high limit safety control (figure 2.0). Do this by
rotating the temperature dial to its lowest setting and setting the Accritem control 20
q
above the
high limit set point. Check that the temperature of the system matches the temperature set point of
the high limit when it engages and shuts the control valve (the red high temp light will engage on
the control panel as well).
Caution: Very hot water may splash as it is discharged; take the
necessary precautions to avoid contact. Return the temperature dial to the desired set point.
14. Observe the entire system over a period of variable loads to determine if any calibration is
necessary on the Accritem temperature controller. The sensitivity of this controller is adjusted by
turning the restriction screw. (See
inserts on the Accritem enclosed ).
15. After start-up, inspect the strainer for any dirt, scale, welding particles or debris that may have
accumulated and remove as necessary; any debris can damage the valve seat or obstruct it from
full shut-off, resulting in possible over-temp conditions and/or scalding .
9. With the system warm, check the operation of the controller. Do this by
Check that the temperature of the system matches the temperature set point of
the controller when it engages and shuts the control valve (the red high temp light will engage on
the control panel as well).
Caution:
Very hot water may splash as it is discharged; take the
necessary precautions to avoid contact. Return the temperature to the desired set point.
10. Observe the entire system over a period of variable loads to determine if any calibration is
necessary on the temperature controller. (See
inserts on the controller enclosed ).
11. After start-up, inspect the strainer for any dirt, scale, welding particles or debris that may have
accumulated and remove as necessary;
any debris can damage the valve seat or obstruct it from
full shut-off, resulting in possible over-temp conditions and/or scalding .
12. Check the flange bolt section for leaks. Tighten only enough to stop leakage. Never tighten more
than necessary. Excessive tightening will shorten the life of the gasket and stretch the studs. See
Page 8 for proper torque values.