Rheem GHE 125-500A Use & Care Manual Download Page 5

5

General Safety Precautions

Be sure to read and understand the entire Use & Care Manual before attempting to install or operate this 

water heater. Pay particular attention to the following General Safety Precautions. Failure to follow these 

warnings could result in a fire or explosion, causing property damage, bodily injury or death. Should you 

have any problems understanding the instructions in this manual, STOP, and get help from a qualified in-

staller or service technician or the gas supplier.

DANGER

!

WARNING

!

Failure to properly vent the water heater to the outdoors 

as outlined in the Venting Section of this manual can 

result in unsafe operation of the water heater. To avoid the 

risk of fire, explosion, or asphyxiation from carbon mon-

oxide, never operate this water heater unless it is properly 

vented and has an adequate air supply for proper opera-

tion. Be sure to inspect the vent system for proper instal-

lation at initial start-up and at least annually thereafter. 

Refer to the Maintenance section of this manual for more 

information regarding vent system inspections.

DANGER

!

WARNING

!

LIQUEFIED PETROLEUM MODELS — Propane (LP) gas, 

must be used with great caution.

•  It is heavier than air and will collect first in lower areas 

making it hard to detect at nose level.

• 

Make sure to look and smell for LP leaks before 

attempting to light appliance. Use a soapy solution to 

check all gas fittings and connections. Bubbling at a 

connection indicates a leak that must be corrected. 

When smelling to detect an LP leak, be sure to sniff 

near the floor too.

•  Gas detectors are recommended in LP applications  

and their installation should be in accordance with the 

manufacturer's recommendations and/or local laws, 

rules, regulations or customs.

•  It is recommended that more than one method be used 

to detect leaks in LP applications.

 IF LP GAS IS PRESENT OR SUSPECTED:

• DO NOT attempt to find the cause yourself;

• DO NOT try to light any appliance;

• DO NOT touch any electrical switch;

• DO NOT use any phone in your building.

•  Leave the building immediately and make sure your 

family and pets leave also.

•  Leave the doors open for ventilation and contact the 

gas supplier, a qualified service agency or the fire 

department.

•  Keep the area clear until the service call has been 

made, the leak is corrected, and a qualified agency has 

determined the area to be safe. Read and Review this 

entire Manual with special emphasis on the Venting Sec-

tions (Pages 11-19) and Operation Section (Pages 23-26) 

prior to any installation work.

Gasoline, as well as other flammable materials and liquids 

(adhesives, solvents, etc.) and the vapors they produce, 

are extremely dangerous. DO NOT handle, use or store 

gasoline or other flammable or combustible materials 

anywhere near or in the vicinity of a water heater. Be sure 

to read and follow the warning label pictured below and 

other labels on the water heater, as well as the warnings 

printed in this manual. Failure to do so can result in prop-

erty damage, bodily injury, or death.

Both LP and natural gas have an odorant added to help 

detection. Some people may not physically be able to 

smell or recognize this odorant. If unsure or unfamiliar 

about the smell associated with LP or natural gas, ask the 

gas supplier. Other conditions, such as "Odorant Fade", 

which causes the odorant to "fade", or diminish in inten-

sity can also hide or camouflage a gas leak. 

!

Water heaters utilizing Liquefied Petroleum gas (LP) are 

different from natural gas models. A natural gas heater will 

not function safely on LP gas and vice versa. No attempt 

should ever be made to convert a heater from natural gas 

to LP gas. To avoid possible equipment damage, personal 

injury or fire: DO NOT connect this water heater to a fuel 

type not in accordance with unit data plate. Propane for 

propane units. Natural gas for natural gas units. These 

units are not certified for any other type fuel.

LP appliances should not be installed below-grade (for 

example, in a basement) if such installation is prohibited 

by federal, state and/or local laws, rules, regulations or 

customs.

WARNING

!

!

D A N G E R

!

FLAMMABLES

Flammable Vapors

      Vapors from flammable

liquids will explode and

catch fire causing death or

severe burns.

Do not use or store flammable

products such as gasoline,

solvents or adhesives in the

same room or area near the

water heater.

Keep flammable products:

1. far away from heater,

2. in approved containers,

3. tightly closed and

4. out of children's reach. 

Water heater has a main

burner and pilot flame.

The pilot flame:

1. which can come on at 

any time and

2. will ignite flammable 

vapors.

Vapors:

1. cannot be seen,

2. are heavier than air,

3. go a long way on the 

floor and

4. can be carried from 

other rooms to the pilot

    flame by air currents.

Installation:

Do not install water heater

where flammable products will

be stored or used unless the

main burner and pilot flames

are at least 18" above the

floor. This will reduce, but not

eliminate, the risk of vapors

being ignited by the main

burner or pilot flame.

Read and follow water heater warnings and instructions. If owners

manual is missing, contact the retailer or manufacturer.

DANGER

!

Summary of Contents for GHE 125-500A

Page 1: ...rmed by a qualified installer service agency or the gas supplier WARNING If the information in these instructions are not followed exactly a fire or explosion may result causing property damage person...

Page 2: ...zards that can kill or hurt you and others All safety messages will follow the safety alert sym bol and either the word DANGER WARNING CAUTION or NOTICE These words mean DANGER An imminently hazardous...

Page 3: ...for altitudes greater than 2 000 up to 5 400 FT HA2 LP Gas Approved for altitudes greater than 5 400 up to 7 800 FT For LP Models see table 6 for approved altitude ranges FOR NATURAL GAS MINIMUM GAS S...

Page 4: ...lations the temperature was set at 120 F before water heater was shipped from the factory The illustration infor mation on pages 25 shows the Display and how to adjust the water temperature Hotter wat...

Page 5: ...ion Section Pages 23 26 prior to any installation work Gasoline as well as other flammable materials and liquids adhesives solvents etc and the vapors they produce are extremely dangerous DO NOT handl...

Page 6: ...of the ser viceable components D RESTAURANT INSTALLATION If the water heater is to be installed in a restaurant or other lo cation where NSF International listing is required this unit must be sealed...

Page 7: ...ure Pressure Temperature and Pressure Relief Valves and Vacuum Relief Valves is provid ed with the water heater No valve is to be placed between the relief valve and the water heater For a circulating...

Page 8: ...nnecting the exhaust vent pipe the condensate elbow assembly supplied but not factory installed must be connected to the ex haust pipe on the water heater See Figure 2 The free end of the 3 x 3 x 1 5...

Page 9: ...earances shown in Figure 4 NOTICE DO NOT use in conjunction with a GFCI To avoid the risk of fire explosion or asphyxiation from carbon monoxide NEVER operate this water heater unless it is properly v...

Page 10: ...he Thermal Expansion Tank if required A manual valve union and a sediment trap shall be provided in front of the gas valve All gas piping must conform to local codes and or the National Fuel Gas Code...

Page 11: ...tarting the vent installation careful planning should be given to the routing and termination of the vent pipes The length of the vent pipes inlet and outlet should be kept to a minimum Also see Figur...

Page 12: ...ruc tions Manual for complete instructions on venting and condensate drainage Stress levels in the pipe and fittings can be signifi cantly increased by improper installation If rigid pipe clamps are u...

Page 13: ...ent and Air Intake Pipe Lengths 6 Pipe Table 4 Minimum and Maximum Vent and Air Intake Pipe Lengths 4 Pipe 50 0 240 Fuel Type Fuel Type NAT or LP NAT or LP Vent4 ft 20 GHE119 500 GHE125 500A 50 50 120...

Page 14: ...d However improper location or installation can result in severe damage to the structure or exterior finish of the building VERTICAL VENT INSTALLATION Once the vent terminal location has been determin...

Page 15: ...lbow A screen that significantly restricts airflow will reduce the performance of the water heater and could cause nuisance control lockouts Com plete the installation of the remainder of the vent and...

Page 16: ...equal to 12 30 5 cm and above expect ed snow level from the ground the instal lation must be modified as shown below See Figure 14 Vent Terminal Low ground clearance Terminate exhaust vent with 45 elb...

Page 17: ...rdance with current ANSI Z223 1 NFPA 54 National Fuel Gas Code A vent shall not terminate directly above a sidewalk or paved driveway that is located between two single family dwellings and serves bot...

Page 18: ...s 2 In accordance with current ANSI Z223 1 NFPA 54 National Fuel Gas Code A vent shall not terminate directly above a sidewalk or paved driveway that is located between two single family dwellings and...

Page 19: ...nt pipe To prevent this from happening the pipe should be installed with a slight upward slope of 1 8 per foot The vent system must be supported every 5 feet of vertical run and every 3 feet of hori z...

Page 20: ...20 Installation Schematic Diagram Figure 18...

Page 21: ...ically grounded Elec trical power should be supplied through a fused disconnect switch located near the water heater Where local codes permit use the supplied power cord for field connection A groundi...

Page 22: ...ater heater and piping air vented Water connections tight and free of leaks C Gas Supply Gas line equipped with shut off valve union and sediment trap drip leg Approved pipe joint compound used Soap a...

Page 23: ...ith the application Hotter water increases the Potential for Hot Water SCALDS When this water heater is supplying general purpose hot water requirements for individuals a thermostatically con trolled...

Page 24: ...as valve is opened and ignitor remains energized for 3 seconds Is flamed detected within 5 seconds Control is manually reset by pressing the i button Blower is de energized and control goes into locko...

Page 25: ...25 Operation Steps to adjust the setpoint temperature Figure 21...

Page 26: ...e knob will not turn by hand don t try to repair it call a qualified service technician Force or attempt to repair may result in a fire or explosion C Do not use this appliance if any part has been un...

Page 27: ...established the inspection program can be modified to suit the water conditions Cleaning should be per formed if the scale has accumulated above the drain valve opening A wet dry shop vac with a nozzl...

Page 28: ...should be less than 25 ppm In the combustion readings are outside of the specified ranges check the manifold pressure on the gas control at the outlet pressure tap See figure 21 for the location of t...

Page 29: ...n the tank Drain the water heater to remove scale and sediment Insufficient hot water Heater undersized for load Reduce hot water usage rate Check display for error code See tables 8 and 9 Temperature...

Page 30: ...t WZ hZ D K Khd K s Ed Table 8 shows a list of lockout error codes A lockout code will be visible on the control dis play in the form of a code letter A followed by a number and a short message Lockou...

Page 31: ...E ZZKZ h E KZ KZd h D d Zd ZKhE ZZKZ t d Z d E KZ KW E t ZZKZ W ZZKZ Table 9 shows a list of blocking error codes A blocking code will be visible on the control dis play in the form of a code letter...

Page 32: ...i t e h t f o t s o m s p m a o r c i m 7 e r u l i a f e m a l f A d e y a l p s i d o s l a s i s e r u l i a f e m a l f f o r e b m u n e h t f o l a t o t g n i n n u r A l a i r t e h t g n i r...

Page 33: ...the measurement is taken after the cycle Besides resistance the continuity of the ignitor circuit can be checked With the multimeter probes still in the terminal switch the meter to check for continui...

Page 34: ...Sensors 2 in 1 T P Relief Valve Condensate Elbow Assembly Trim Plate 2 pcs Flue Gas Temperature Sensor Blocked Exhaust Switch Inlet Pipe Nipple Power Supply Junction Box Insulation Tank Top Air Intake...

Page 35: ...trol Panel Parts Stando 3 5 in length Transformer 120 VAC 24 VAC Relay Terminal Block Main Operating Control Control Display Display Bracket Description Description Fuse 5A delay Stando 2 5 in length...

Page 36: ...ting ange insulation disk retaining plate and bolts Flange Assembly Gasket blower to transition tube Blower Gas Control Gasket burner to mounting ange Burner Gas Pressure Switch Gas Control Flange w g...

Page 37: ...37 Notes...

Page 38: ...38 Notes...

Page 39: ...39 Notes...

Page 40: ...ng information should be made available a Model and serial numbers of the water heater as shown on the rating plate attached to the jacket of the heater b Address where water heater is located and can...

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