Harsco Industrial MODU-FIRE FORCED DRAFT N750 Installation & Owner's Manual page 33

5.1.3 Monthly
1.
Using the control panel, enter the information mode and scroll down to view the flame signal. When the boiler
is firing, the signal will be "yes" and when the boiler is not firing, the signal will be "no".
2. Test high-limit control by reducing setting below the operating temperature. Burner should shut off. After
readjusting the thermostat, press the button to reset the switch.
3. Test operating temperature control by reducing temperature setting as necessary to check burner operation.
4. Check flue gas temperature at outlet. If there is a temperature increase over previous readings, the probable
cause is soot or water-scale build- up on the tubes.
5. Test the water flow switch by trying to restart boiler with the system pump off. The boiler should not operate
and the control should display LOW FLOW/ILK.
6. Test low gas pressure switch and high gas pressure switch utilizing the procedure in sections 3.11.4 & 3.11.5.
The boiler should fail to start and the control should display LOW GAS or HIGH GAS
7. Inspect and clean the inlet screen of any accumulated dust or lint.
8. The relief valve should be tested as per manufacturer's instructions or every two months by lifting the lever for
5 seconds and allowing the valve to snap shut. Please see the manufacturer's recommendations on the relief
valve tag.
5.1.4 Annually
In addition to the recommended monthly service:
1. Inspect burner and ignition system. Wash the burner (do not scrub or use wire brush) to remove any soot or
foreign material that may have accumulated. See Section 5.2 on "Cleaning the Burner." Check the burner
and its parts. If there is evidence of deterioration or corrosion, replace immediately.
2. Inspect combustion chamber. To access the heat exchanger, remove the front door and the front inner
wrapper. Note any signs of deterioration. Examine the gasket and replace if necessary, using a Harsco In-
dustrial, Patterson-Kelley gasket kit only.
3. Inspect and clean heat exchanger. Wash the copper tubes with water and non corrosive soap. Be sure to
rinse thoroughly. Green scale on the tubes indicates that the boiler is condensing which is detrimental to boi-
ler life. Perform corrective action as necessary.
4. Examine the venting system.
a. Check all joints and pipe connections for tightness.
b. Check vent for corrosion or deterioration. If any venting needs replacing, do so immediately.
5. Inspect heating system for other problems.
6. Perform combustion analysis and adjust if necessary (See 3.12.3).
7. Leak test gas valves. Leak Test must be performed only by qualified Harsco Industrial, Patterson-Kelley certi-
fied personnel, who have been trained in this procedure. This procedure is available on request from the
Harsco Industrial, Patterson-Kelley factory.
MODU-FIRE® Forced Draft Gas-Fired Boiler
33