Service Manual

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Water Heater Installation Checklist
Product Handling
Carefully uncrate the heater. Move in place with a hand truck (Do NOT use the
venting pipes for handles).
Electrical Requirements
Make sure there is 120 volts line voltage. Line voltage must be properly polarized.
Adequate ground supplied to the heater.
Venting Requirements
All venting must stay within the required lengths and diameter (see table below).
Proper support of the venting pipe is a MUST (every 5 ft (1.5 m) vertical and 3 ft (.92
m) horizontal). Termination must be located to prevent re-circulation of flue gases.
Gas Requirements
Gas piping sized adequately, 3/4". Install a properly sized regulator (if unknown,
assure an adequate volume of gas is available). 7" W.C. is required when the unit is
running. Gas pressure must stay below 14" W.C. static pressure. Pressure drops
between static pressure and operating flow should be less than 3" W.C.
Service/Mechanical Room
Provide adequate space for servicing heater. Leave enough overhead room to
remove the anode rods for servicing (18" min).
Vent Tables
(Intake Only)
Determining Required Intake Vent Length
1. Determine the total length of straight vent pipe (in feet) required for the intake.
2. Add 5 feet of venting for every 90° elbow.
3. Add 2 ½ feet of venting for every 45° elbow.
4. Total intake vent length cannot exceed Max Intake Vent Length on the venting table shown above.
Example Of Total Intake Vent Length For UCG100H399 Installation:
A 3” venting system has a total of two 90-degree elbows and a total straight pipe length of 10 feet.
Equivalent vent length for elbows: 2 x 5 feet = 10 feet.
Total equivalent intake vent distance = 10 feet + 10 feet = 20 feet total equivalent vent length. This is
below the maximum allowed distance of 25 feet for this model using 3” vent.
The “metal/atmospheric” exhaust system of this unit must follow the National Fuel Gas code.
Model Number
2” Max Intake
Vent Length (feet)
3” Max Intake
Vent Length (feet)
4” Max Intake
Vent Length (feet)
UCG80H125
20
50
75
UCG(80,100)H199
20
50
75
UCG(80,100)H270
20
50
75
UCG(80,100)H399
N/A
75
20
WARNING
The UCG(80,100)H399 model is not approved for 2 inch diameter vent pipe. Venting with 2 inch
pipe may result in damage to the water heater or cause an unsafe condition. DO NOT use 2
inch vent air intake pipe with UCG(80,100)H399.