A.O. Smith COF-199 manual Check List and Service Information, Electrical Wiring Replacement

MANIFOLD KIT COMMERCIAL OIL FIRED WATER HEATERS

Precision cut type "L" all copper A.O. Smith manifold kits assure water flow balance of all units. Without this balance, the full water heating and storage potential of the system cannot be achieved. Plus, the units with the higher water flow may have a shortened life. Unions and T & P valves shown in piping diagrams are not included in the manifold kits.

Dimensions shown are for minimum space occupied by complete assemblies. Service space in front of units must be added.

DANGER:

TEMPERATURE SETTING SHOULD NOT EXCEED SAFE TEMPERATURES AT

FIXTURES. SEE WATER TEMPERATURE CONTROL WARNING ON PAGE 11. IF

HIGHER PREHEAT TEMPERATURES ARE NECESSARY TO OBTAIN ADEQUATE

BOOSTER OUTPUT, ADD AN ANTI-SCALD VALVE FOR HOT WATER SUPPLIED

TO FIXTURES.

THREE UNIT MANIFOLD KIT (PART NO. 78693)

TWO UNIT MANIFOLD KIT (PART NO. 78692) FOUR UNIT MANIFOLD KIT (PART NO. 78694)

CHECK LIST AND SERVICE

INFORMATION

IMPORTANT

The installer may be able to observe and correct certain problems which might arise when the unit is put into operation or when it is refired after a prolonged shut-down. HOWEVER, it is recommended that only qualified servicemen, using appropriate test equipment, be allowed to service the heater.

DANGER

BE SURE TO TURN OFF THE ELECTRICITY WHENEVER POSSIBLE OR APPROPRIATE WHEN CHECKING EQUIPMENT.

ELECTRICAL WIRING REPLACEMENT

If any of the original wiring, as supplied with the appliance, must be replaced, it must be replaced with 16 AWG, or greater, copper conductor with 600V, 105°C rated, thermoplastic insulation.

2.Check the fuses.

•The oil burner electrical disconnect switch usually contains fuses.

3.The capacity of the heater may have been exceeded by a large demand for hot water.

•Large demands require a recovery period to restore water temperature.

4.Colder incoming water temperature will lengthen the time required to heat water to the desired temperature.

•If the heater was installed when incoming water temperature was warm, colder water creates the effect of less hot water.

5.Look for hot water wastage and leaking or open hot water faucets.

6.Sediment or lime scale may be affecting water heater operation. Refer to MAINTENANCE for details.

7.Heater or burner may be dirty.

NOT ENOUGH OR NO HOT WATER

	•	Clean all heater flue pipes and flue connector.
1. Be certain the oil burner electrical disconnect switch serving the water	•	Have burner properly cleaned and readjusted.
heater is in the ON position.

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