PB Heat MI/MIH series manual Maintenance, A.General, B.Daily With Boiler In Use

MAINTENANCE

A.GENERAL

1.Disconnect this boiler from the gas supply piping during any pressure testing of the gas system.

2.Check pipes adjacent to cold walls or in unheated spaces. Insulate and tape them if necessary to be sure they can’t freeze up. Keeping the water moving at all times will reduce the likelihood of freezing. See Section 3 for glycol instructions.

3.If there is considerable foreign matter in the boiler water, the boiler should be shut down and allowed to cool, then drained and thoroughly flushed out. Use the drain valve at the bottom of the return connection to drain the boiler. Pipe the drain cock to a suitable drain or containment device if a glycol solution is used. Flush the system to remove remaining matter. If there is evidence that hard scale has formed on the internal surfaces, the boiler should be cleaned by chemical means as prescribed by a qualified water treatment specialist.

4.There must not be signs of continuous wetness at the chimney. If signs of continuous wetness are observed, a qualified service agency must be consulted to modify the vent configuration to prevent the formation of condensate.

B.DAILY (WITH BOILER IN USE)

Daily boiler observation can be performed by the owner. If any potential problems are found, a qualified installer or service technician/agency must be notified.

1.Remove any combustible materials, gasoline and other flammable liquids and substances that generate flammable vapors from the area where the boiler is contained. Make certain that the boiler area has ample air for combustion and ventilation and that there are no obstructions to the free flow of air to and from the boiler.

2.Observe general boiler conditions (unusual noises, vibrations, etc.)

3.Observe operating temperature and pressure on the combination gauge located on the left side of the

boiler. Boiler pressure should never be higher than

5 psi (35 kPa) below the rating shown on the safety relief valve; 25 psig (172 kPa) maximum for a 30 psig (207 kPa) rating, 45 psig (310 kPa) maximum for a 50 psig (345 kPa) rating). The valve rating can be found on the top of the safety relief valve (see Figure 5 for location of the safety relief valve). Boiler temperature should never be higher than 250°F (121°C).

4.Check for water leaks in boiler and system piping.

5.Smell around the appliance area for gas. If you smell gas, follow the procedure listed in the Lighting/Operating Instructions in Section 7.

C.WEEKLY (WITH BOILER IN USE)

1.Flush float-type low-water cut-off (if used) to remove sediment from the float bowl as stated in the manufacturer’s instructions.

D.MONTHLY (WITH BOILER IN USE)

1.Check boiler room floor drains for proper functioning.

2.Check function of the safety relief valve (monthly unless specified otherwise by manufacturer) by performing the following test:

a.Check valve piping to determine that it is properly installed and supported.

b.Check boiler operating temperature and pressure.

c.Lift the try lever on the safety relief valve to the full open position and hold it for at least five seconds or until clean water is discharged.

d.Release the try lever and allow the valve to close. If the valve leaks, operate the lever two or three times to clear the valve seat of foreign matter. It may take some time to determine if the valve has shut completely.

e.If the valve continues to leak, it must be replaced before the boiler is returned to operation.

f.Check that operating pressure and temperature have returned to normal.

g.Check again to confirm that valve has closed completely and is not leaking.

3.Test low-water cut-off (if used) as described by the manufacturer.

4.Test limit as described in Section 7F, “Check-Out Procedure.”

5.Test function of gas safety shut-off features as described by gas valve and ignition control manufacturer.

6.Cycle the boiler at least once and check operation of the vent damper.

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