Operating instructions

The combustion chamber insulation con-
tains ceramic fibers, which are classified as
a possible human carcinogen. When
exposed to extremely high temperatures,
the ceramic fibers, which contain crystalline
silica, can be converted into cristobalite.
Avoid Breathing and Contact with Skin and Eyes
When removing or repairing the combustion cham-
ber insulation follow these precaution measures:
1. Use a NIOSH approved respirator which meets
OSHA requirements for cristobalite dust, similar
to N95. Contact NIOSH at 1-800-356-4676 or
on the web at www.cdc.gov/niosh for latest
-
recommendations.
2. Wear long sleeved, loose fitting clothing,
gloves and eyes protection.
3. Assure adequate ventilation.
4. Wash with soap and water after contact.
5. Wash potentially contaminated clothes
separately from other laundry and rinse
washing machine thoroughly.
6. Discard used insulation in an air tight plastic
bag.
NIOSH Stated First Aid:
Eye/Skin: Immediately irrigate
Breathing: Clean fresh air
WARNING
Handling Previously Fired Combustion Chamber Insulation
Maintenance Procedures
68
7. Attach separate hose to the field installed
domestic cold water inlet drain/flush valve.
8. Submerge the other end of this hose
halfway in fluid in the same bucket.
9. Open both drain/flush valves on the domes-
tic cold and hot water lines.
To avoid risk of electrocution ensure all
power is off to the appliance before ser-
vicing. Use G.F.C.I. protected power
supply to pump. Additionally before
powering up the circulating pump
ensure all hose connections and fittings
are leak free and no water is on the floor.
10. Carefully power up the pump allowing the
vinegar to circulate through the domestic
heat exchanger for 1 hour.
11. Turn pump off and carefully remove all
power to the pump.
12. Close both drain/flush valves on the
domestic cold and hot water lines.
13. Remove hose from bucket and pump con-
nected to the drain/flush valve on the
domestic hot water outlet.
14. Relocate the remaining hose still connected
to the domestic cold water inlet drain/flush
valve to the domestic hot water outlet
drain/flush valve and the other end of this
hose from the bucket to a suitable drain.
15. Rinse the domestic heat exchanger for 5 min-
utes by opening both the domestic hot water
outlet drain/flush valve and the isolation (shut)
off valve on the domestic cold water inlet.
16. Close drain/flush valve on the domestic hot
water outlet.
17. Remove hose from the drain/flush valve on
the domestic hot water outlet.
18. Open the field installed isolation (shut off)
valve on the domestic hot water outlet.
19. Turn on all electric to the appliance.
20. Perform the required startup and checkout
procedures as outlined on pages 40 to 58.
Review With Owner
Ensure the owner understands the impor-
tance to perform the maintenance schedule
specified in this manual.
Remind the owner of the importance to call a
licensed contractor should the appliance or
system exhibit any unusual behavior.
WARNING