Maintenance
WARNING: Turn off the electrical power supply, the manual gas control valve, and the manual water control valve before servicing.
The unit should be checked once a year or as necessary by a certified and trained technician. If repairs are needed, the repairs should be done by a certified and trained technician.
The following systems and parts should be checked at least once a year:
1.Venting systems
2.Burners
3.Manual operation of the pressure relief valve to ensure correct operation.
4.Periodic cleaning of the water filter, refer to figure below.
5.Heat exchanger. Remove the thermistor and check for a mineral coating . A mineral coating on the thermistor requires flushing the heat exchanger with a descaling solution. Scale build up will void your warranty and shorten the life of your water heater.
Troubleshooting
Water Isn’t Hot Enough
The T-K2 can burn gas at a maximum input rate of 185,000 BTUH. This puts a limit on the possible output temperature and flow capabilities (See flow chart on the last page of this manual). If the water doesn’t seem hot enough, compare the flow and temperature that is being attained to the T- K2 flow vs. temperature chart. If the unit is not performing according to the chart, first check that the gas supply line is sized properly, and that the gas pressure is within the required range. If the gas line is okay, check the plumbing for mixing valves, thermostatic valves, scald protection, single handled valves or crossed connections. If the unit is performing in accordance with the flow chart, then it may be undersized for the application. If the unit is performing according to the chart, the output temperature can be adjusted using the TK-RE01 or with the dipswitches on the unit (See pgs. 21-22)
It Takes Too Long to Get Hot Water
The T-K2 takes three seconds to ignite, and three more to get up to temperature. The rest of the time needed for hot water to get to a fixture is due to the length of piping between the water heater and the fixture. If the unit seems to be taking longer than six seconds to initiate, check the filter and flow sensor for any debris or damage.
