Lochinvar 45,000 - 260,000 BTU/HR service manual Inspection and Cleaning, Breathing Fresh air

Installation & Service Manual

7Maintenance (continued)

￿Avoid breathing dust and contact with skin and eyes.

•Use NIOSH certified dust respirator (N95). This type of respirator is based on the OSHA requirements for cristobalite at the time this document was written. Other types of respirators may be needed depending on

the jobsite conditions. Current NIOSH recommendations can be found on the NIOSH website at (http://www.cdc.gov/niosh/homepage.html). NIOSH approved respirators, manufacturers and phone numbers are also listed on this website.

•Wear long-sleeved, loose fitting clothing, gloves, and eye protection.

￿Apply enough water to the combustion chamber lining to prevent airborne dust.

￿Remove combustion chamber lining from the appliance and place it in a plastic bag for disposal.

￿Wash potentially contaminated clothes separately from other clothing. Rinse clothes thoroughly.

￿NIOSH stated First Aid:

Eye: Irrigate immediately.

Breathing: Fresh air.

a.Turn “OFF” main power to the appliance.

b.Turn “OFF” external manual gas shutoff valve to appliance.

c.Remove the control panel door.

d.Remove the outer air deflector (FIG. 7-2)

e.Disconnect gas valve wiring and remove gas manifold assembly.

f.Remove ignition wire leading to the pilot assembly from the ignition module.

g.Disconnect the wiring from the flame rollout/interlock switch, see FIG. 5-8, page 38.

h.Remove the lower front jacket panel.

i.Remove the control panel mounting screws. When removing the control panel, lay the control panel to the side with the wiring intact, being careful not to damage any of the wiring.

Remove the combustion chamber door. Use caution to prevent damage to burners, refractory, pilot or wiring.

Inspection and Cleaning

j.Check the heat exchanger surface for sooting. The external surfaces of the copper tubes should be free of any soot deposits. (A slight black smudge is normal with some types of gases.) If abnormal soot deposits are present, the heat exchanger must be cleaned and the cause of the soot problem corrected. Proceed as follows:

k.Remove soot from burners and bottom of the finned tubes with a stiff bristle brush. Dirt may also be removed from burner ports by rinsing the burner thoroughly with water. Drain and dry burners before re-installing. Damaged burners must be replaced.

An appliance installed in a dust or dirt contaminated atmosphere will require cleaning of the burners on a 3 to 6 month schedule or more often, based on severity of contamination. Contaminants can be drawn in with the combustion air. Non-combustible particulate matter such as dust, dirt, concrete dust or dry wall dust can block burner ports and cause non-warrantable failure. Use extreme care when operating an appliance for temporary heat during new construction. The burners will probably require a thorough cleaning before the appliance is placed in service.

l.Remove gas manifold as described in steps a. thru e. in “Heat Exchanger/Burner Access.”

m.Loosen mounting screws and remove front control panel.

n.Loosen screws on the upper front jacket panel and remove toward front of the appliance. Use caution to prevent damage to refractory on the doors inner surface.

o.Check “V” baffles on top of the heat exchanger. Remove and clean if necessary.

p.Remove soot from the heat exchanger with a stiff bristle brush. Soot may also be removed from the heat exchanger by washing thoroughly with detergent and water. Remove the heat exchanger before using water for cleaning. Rinse thoroughly and dry before re-installing. Use a vacuum to remove loose soot from surfaces and inner chamber.

q.Remove the heat exchanger (HEX) filler bracket (FIG. 7-2).

r.The heat exchanger can be removed by sliding towards the front of the appliance. Once the heat exchanger is removed from the appliance, a garden hose can be used to wash the tubes to ensure that all soot is removed from the heat exchanger surfaces.

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