A.O. Smith GPVH-50 사용자 설명서

11

HOTTER  WATER  CAN  SCALD: 
Water heaters are intended to produce hot water.  Water heated to a 
temperature which will satisfy space heating, clothes washing, dish 
washing, cleaning and other sanitizing needs can scald and permanently 
injure you upon contact.  Some people are more likely to be permanently 
injured by hot water than others.  These include the elderly, children, the 
infi rm, or physically/mentally handicapped.  If anyone using hot water in 
your home fi ts into one of these groups or if there is a local code or state 
law requiring a certain temperature water at the hot water tap, then you 
must take special precautions.  In addition to using the lowest possible 
temperature setting that satisfi es your hot water needs, a means such 
as a *mixing valve, should be used at the hot water taps used by these 
people or at the water heater, see Figure 2.  Valves for reducing point 
of use temperature by mixing cold and hot water are also available:
 
Consult a Qualifi ed Installer or Service Agency.  Follow  manufacturer’s 
instructions for installation of the valves.  Before changing the factory 
setting on the thermostat, read the “Temperature Regulation” section 
in this manual.

This water heater shall not be connected to any heating systems or 
component(s) used with a non-potable water heating appliance.

All piping components connected to this unit for space heating 
applications shall be suitable for use with potable water.

Toxic chemicals, such as those used for boiler treatment shall not be 
introduced into this system.

When the system requires water for space heating at temperatures 
higher than required for domestic water purposes, a tempering valve 
must be installed.  Please refer to Figure 2 for suggested piping 
arrangement.

CLOSED WATER SYSTEMS
Water supply systems may, because of code requirements or such 
conditions as high line pressure, among others, have installed devices 
such as pressure reducing valves, check valves, and back flow 
preventers. Devices such as these cause the water system to be a 
closed system.

THERMAL EXPANSION
As water is heated, it expands (thermal expansion). In a closed system 
the volume of water will grow. As the volume of water grows there will be 
a corresponding increase in water pressure due to thermal expansion. 
Thermal expansion can cause premature tank failure (leakage). This type 
of failure is not covered under the limited warranty. Thermal expansion 
can also cause intermittent temperature-pressure relief valve operation: 
water discharged from the valve due to excessive pressure build up. 
The temperature-pressure relief valve is not intended for the constant 
relief of thermal expansion. This condition is not covered under the 
limited warranty.

A properly sized thermal expansion tank should be installed on all 
closed systems to control the harmful effects of thermal expansion. 
Contact a local plumbing service agency to have a thermal expansion 
tank installed.

NOTE:  To protect against untimely corrosion of hot and cold 
water fi ttings, it is strongly recommended that di-electric unions 
or couplings be installed on this water heater when connected 
to copper pipe.

All gas piping must comply with local codes and ordinances or with the 
National Fuel Gas Code (ANSI Z223.1/ NFPA-54) whichever applies. 
Copper and brass tubing and fi ttings (except tin lined copper tubing) 
shall not be used.