HTP CG300N65 User Manual
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LP-436 REV. 3.21.14
If the water heater has been undersized.
When large amounts of hot water are drawn from the water heater in a short period of time, and the refill water is very cold.
Due to the efficiency rating of this gas-fired water heater, it may produce more condensation than previous water heater models.
Condensation forming on the flue tubes will drop on the burner, making a “sizzling” sound. In extreme cases, the condensate may even
extinguish the pilot flame. This condition is not uncommon and must never be misinterpreted as a leaking tank. Excess condensation
will disappear once the water becomes heated.
Because of the large amounts of water that can condense, it is very important that a drain pan be installed under the water heater.
Refer to Figure 10. Under no circumstances is the manufacturer to be held liable for any water damage in connection with this
water heater. If the problem does not go away and water continues to drip after the water heater has heated up, check all of the
plumbing connections to make sure they are not leaking.
Main Burner and Pilot
Every 3 months, slide out the burner rack to inspect the burner ports, pilot, and burner orifices. See Figure 15 for burner assembly. Use
a wire brush and vacuum cleaner to remove any dirt or debris present. In order for the water heater to operate properly after cleaning,
make sure the burner rack is returned to its original position.
Cleaning out the Water Heater
Lime, scale, or sediment may accumulate at the bottom of this water heater. The amount deposited will depend on the hardness of the
water supply where this water heater is installed. The harder the water, the more sediment will accumulate. If this sediment is left
unchecked, it will reduce the efficiency and life of the water heater.
To control sediment build-up:
1. Drain a pail of water through the drain valve once a month.
2. Every 3 months, use the following procedure to clean out the bottom of the water heater through the cleanout hole opening:
a. Drain out the water. (Refer to Draining the Water Heater).
b. Remove the cleanout door on the lower right side of the water heater jacket.
c. Undo the 6 hex head bolts securing the cleanout cover and remove the cover.
d. Remove any excess sediment accumulation from the bottom of the water heater, taking care not to damage the water
heater’s glass lining.
e. Inspect the cleanout cover’s gasket for wear and replace it if necessary.
f. Replace the cleanout cover and cleanout cover door.
g. Refill the water heater (refer to Filling the Water Heater) and turn on the gas (refer to Lighting Instructions).
Temperature and Pressure Relief Valve
Manually operate the temperature and pressure relief valve at least once a year. Stand clear of the outlet to avoid being burned. Lift
and release the operating lever on the valve to make it operate freely. If, after manually operating the valve, it fails to completely reset
and continues to discharge water, replace it with a new valve (refer to Draining the Water Heater).
Venting System Inspection
The venting system must be thoroughly inspected once a year. Check the area where the water heater is located to make sure that
there is enough clean combustion and ventilation air. Remove any possible obstructions that would prevent proper air circulation and
venting. Check the venting system. Make sure all of the connections are securely fastened, and that all of the joints are properly sealed.
If any part of the venting system is damaged, it must be replaced by a qualified service technician. Test the ventilation system to make
sure that it is venting properly (refer to Drafthood Operation).
Anode
This water heater is equipped with multiple anode rods that are designed to prolong the life of the glass-lined tank. By the electrolytic
action, these anodes are slowly consumed, protecting the glass-lined tank from corrosion. Each anode should be checked every 2
years by looking through the cleanout port (refer to Draining the Water Heater). If more than half of an anode has been consumed, it
should be replaced. Instructions on how to change an anode can be obtained from the manufacturer.
The life expectancy of the water heater is reduced where a water softener is introduced to fight hard water. The sodium salts added by
a softener make this water extremely conductive. In these conditions, the anodes are consumed more rapidly and should be inspected
every year.
In certain water conditions, the anodes will react with the water, producing discolored or smelly water. The most common complaint is
hot water that smells like rotten eggs. This phenomenon is the result of the reaction between the anodes and hydrogen sulfide gas
dissolved in the water which occurs frequently in well systems. This problem can usually be eliminated or reduced by changing the
anodes to a type more suitable for these conditions (aluminum anodes) and by chlorinating the water heater and plumbing system. If
the problem persists, special filtration equipment may be required. Under no circumstances are the anodes to be removed from the
water heater on a permanent basis. Removal of the anodes will lead to premature failure of the water heater and void the
warranty.