Lochinvar SNA285-125, SNA500-125 Handling ceramic fiber materials, Cleaning heat exchanger

TM

Installation & Service Manual

12 Maintenance (continued)

Handling ceramic fiber materials

REMOVAL OF COMBUSTION CHAMBER LINING

Cleaning heat exchanger

1. Shut down water heater:

• Follow the “To Turn Off Gas to Appliance” instructions

for the water heater on pages 45 and 46.

￿WARNING

The combustion chamber door insulation in this product contains ceramic fiber material. Ceramic fibers can be converted to cristobalite in very high temperature applications. The International Agency for Research on Cancer (IARC) has concluded, “Crystalline silica inhaled in the form of quartz or cristobalite from occupational sources is carcinogenic to humans (Group 1).”:

￿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 job site

conditions. Current NIOSH recommendations can be found on the

NIOSH website at http://www.cdc.gov/niosh/homepage.ht

ml. 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 the combustion chamber lining from the water heater and place it in a plastic bag for disposal.

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

	• Do not drain the water heater unless it will be exposed
	to freezing temperatures.
2.	Allow time for the water heater to cool to room temperature
	if it has been firing.
3.	Remove the blower assembly (gas air/arm) from the heat
	exchanger access cover. Set bolts aside.
4.	Remove the nuts securing the heat exchanger access cover to
	the heat exchanger and set aside.
5.	Remove the heat exchanger access cover, cover gasket(s) and
	chamber insulation assembly.
		The water	heater contains	ceramic	fiber
￿ WARNING
		materials.	Use care when	handling	these

materials per instructions listed on this page. Failure to comply could result in severe personal injury.

6.Use a vacuum cleaner to remove any accumulation on the water heater heating surfaces. Do not use any solvent.

7.Finish cleaning using a clean cloth dampened with warm water.

8.Install access cover gasket, chamber insulation assembly and cover.

9.Secure nuts on the studs. DO NOT overtighten.

10.Re-install the blower assembly (gas air/arm) using the bolts set aside in Step 3.

11.Close isolation valves on piping to isolate water heater from system. Attach a hose to the water heater drain and flush water heater thoroughly with clean water by using purging valves to allow water to flow through the water make-up line to the water heater.

12.When the water heater has been flushed, restore water heater to operation.

13.Perform start-up and check-out procedures listed in Section 10 - Start-up.

NIOSH stated First Aid.

￿Eye: Irrigate immediately.

￿Breathing: Fresh air.

Oiled bearing circulators

1.The circulator shipped with the Shield water heater is water- lubricated. No oiling is required.

2.Check other circulators in the system. Oil any circulators requiring oil, following circulator manufacturer’s instructions. Over-oiling will damage the circulator.

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