HTP CG300N65 - Manual (Page 5)

5
LP-436 REV. 3.21.14
If the heater is exposed to the following, do not operate until all corrective steps have been made by a qualified serviceman:
1. FIRE
2. DAMAGE
3. WATER
Any claims for damage or shortage in shipment must be filed immediately against the transportation company by the consignee. DO
NOT install or attempt to repair any damaged component or parts. If you detect any damage, contact the dealer where the water heater
was purchased or the manufacturer listed on the warranty.
DO NOT USE THIS APPLIANCE IF ANY PART HAS BEEN UNDERWATER. Immediately call a qualified service technician. Replace
any part of the control unit that has been under water.
B. IMPROPER COMBUSTION
Do not obstruct the flow of combustion and ventilating air. Adequate air is necessary for safe operation.
C. GAS
Should overheating occur or gas supply fail to shut off, turn off the manual gas control valve to the water heater. Ensure that the type of
gas supplied corresponds to that which is marked on the rating plate and main gas valve of the water heater.
D. WHEN SERVICING THE HEATER

To avoid electric shock, disconnect electrical supply before performing maintenance.

To avoid severe burns, allow heater to cool.

Do not use petroleum-based cleaning or sealing compounds in a heater system. Gaskets and seals in the system may be
damaged. This can result in substantial property damage.
 Do not use “homemade cures” or “heater patent medicines”. Substantial property damage, damage to heater, and/or serious
personal injury may result.
E. WATER QUALITY
Water Chemistry
Chemical imbalance of the water supply may affect efficiency and cause severe damage to the water heater and associated equipment.
HTP recommends having water quality professionally analyzed to determine whether it is necessary to install a water softener. It is
important that the water chemistry on both the domestic hot water and central heating sides are checked before installing the water
heater, as water quality will affect the reliability of the system. Failure of a water heater due to lime scale build-up on the heating
surface, low pH, or other chemical imbalance IS NOT covered by the warranty.
Operating temperatures above 135 o F will further accelerate the build-up of lime scale on the heating surface and may shorten the
service life of the water heater. Failure of a heat exchanger due to lime scale build-up on the heating surface, low pH, or other chemical
imbalance IS NOT covered by the warranty.
Outlined on the following page are water quality parameters which need to be met in order for the system to operate efficiently for many
years.
Water Hardness
Water hardness is mainly due to the presence of calcium and magnesium salts dissolved in water. The concentration of these salts is
expressed in mg/L, ppm, or grains per gallon as a measure of relative water hardness. Grains per gallon is the common reference
measurement used in the U.S. water heater industry. Hardness expressed as mg/L or ppm may be divided by 17.1 to convert to grains
per gallon. Water may be classified as very soft, slightly hard, moderately hard, or hard based on its hardness number. The minerals in
the water precipitate out as the water is heated and cause accelerated lime scale accumulation on a heat transfer surface. This lime
scale build-up may result in premature failure of the heat exchanger. Operating temperatures above 135
o
F will further accelerate the
build-up of lime scale on the heating surface and may shorten the service life of the water heater.
Water that is classified as hard and very hard must be softened to avoid heat exchanger failure.