State Industries GS6, GSX, GPX manual Not Enough HOT Water GAS, Test, Results

Page 34

BULLETIN 35

NOT ENOUGH HOT WATER - GAS

CAUSES

Complaints regarding an insufficient supply of hot water are typically the result of a water heater that cannot meet the demands of the residence (both people and appliances). The demand for sufficient hot water may also be exceeded if additional people and/or appliances are added to the residence. Another factor that may reduce the hot water output is mineral build-up. Reference Bulletin 13 to determine if mineral build-up may be effecting your hot water output. The following test will help determine if a water heater is supplying the intended amount of hot water.

TEST

Please read all the steps of the test prior to beginning. NOTE: This test is based on

 

140° F storage temperature and these amounts are approximate.

 

 

STEP 1

Do not use any hot water for two hours to ensure the accuracy of this test. Turn on the

 

cold water at full flow using a double handle faucet and time how long it takes to fill a

 

one-gallon jug. Calculate the Gallons Per Minute (GPM) flow rate as follows.

 

One-gallon Jug filled in:

 

 

 

 

 

 

 

 

 

 

5 seconds = 12 gallons per minute

 

 

 

 

 

 

 

10 seconds = 6 gallons per minute

 

 

 

 

 

 

 

15 seconds = 4 gallons per minute

 

 

 

 

 

 

 

20 seconds = 3 gallons per minute

 

 

 

 

 

 

 

30 seconds = 2 gallons per minute

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

STEP 2

Using a thermometer, turn on the hot water and time how long it takes for the water

 

temperature to drop 30 degrees.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Gallons Per Minute (GPM) Flow Rate

 

 

 

 

 

 

1.5

2

2.5

3

3.5

4

5

6

 

 

 

30 Gallon Tank

14 min.

10 min.

8 min.

7 min.

6 min.

5 min.

4 min.

3 min.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

40 Gallon Tank

18 min.

14 min.

11 min.

9 min.

8 min.

7 min.

5 min.

4 min.

 

 

 

50 Gallon Tank

23 min.

17 min.

14 min.

12 min.

10 min.

9 min.

8 min.

6 min.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

65 Gallon Tank

30 min.

22 min.

18 min.

15 min.

13 min.

11 min.

9 min.

8 min.

 

 

 

75 Gallon Tank

35 min.

26 min.

21 min.

17 min.

15 min.

13 min.

10 min.

8 min.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

100 Gallon Tank

47 min.

35 min.

28 min.

23 min.

20 min.

17 min.

14 min.

11 min.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

119 Gallon Tank

56 min.

42 min.

33 min.

28 min.

24 min.

21 min.

17 min.

14 min.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Minutes to drop 30° F

 

 

 

 

Example: 10 seconds to fill the one-gallon jug equals 6 gallons per minute flow rate. If the temperature drops 30 degrees in 6 minutes that equals 36 gallons of hot water. This is normal for a 50 gallon water heater. The amount will be about 70% of the capacity of the heater.

RESULTS

If the test performed above results in a 70% (+ /- 10 %) capacity, then the heater is performing per specifications and a larger water heater should be considered in order to meet the demand.

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Contents
Models GPX, GS6, GSX Series 200/201 06/09 316876-000Page Service Handbook Tools Required for servicing gas modelsFire or Explosion Harzard Insufficient HOT Water No HOT WaterWater Leakage Problem Possible Cause Test / Corrective Action Table of Contents Water Supply- Cold Use & Care Guide for clearances Basic Installation & OperationSee Labels and Installation Instructions To Fixtures HotHot Water Temperature-PressureAnode Rod Cold WaterNormal Operation Thermal Cut Off Switch TCO The water heater Basic Installation & Operation Combustion Air Requirements Carbon Monoxide WarningReference Vent Connectors PER FT Draining and Filling the Water Heater Draining the Water Heater Filling the Water HeaterChecking the GAS Supply Pressure Checking for Sufficient Combustion AIR or Venting IssuesThen Draft Test Testing the Thermocouple and GAS Control VALVE/THERMOSTAT Thermal Switch ModelsRemoving the Burner from the Manifold/ Burner Assembly Removing the Manifold/Burner AssemblyReplacing the Thermocouple Replacing the Thermocouple and GAS Control VALVE/THERMOSTAT Replacing the Manifold/Burner AssemblyExplosion Hazard Removing the Gas Valve Removing and Replacing the Gas Control Valve/ThermostatReplacing the Gas Valve Water Time to Produce 2nd & 3rd GAS Water Heater Sizing Guide Leakage CheckpointsTechnical Bulletins 35-36Effects Water HammerGeneral FIXMineral BUILD-UP SymptomsCause If tank is new with no lime build-up to any degree Aluminum HydroxideIf tank is new with lime build-up to any degree Causes Condensation Diagnosis Discolored Water TreatmentSmelly Water Procedure Chlorination ProcedureStep Test Not Enough HOT Water GASResults Thermal Expansion Outlet Inlet Cold Water Inlet Valve SHUT-OFF Valve Leaking Temperature and Pressure Relief Valve Insulation Blankets General Information Formulas and ConversionsMM millimeters =Inches X Page Page
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