Rheem Water Heater GX90 550 User Guide

Xtreme  
High-Input Gas Commercial Water Heaters  
Available in 90 Gallon Tank-Type Models  
550,000 BTU/Hr. thru 715,000 BTU/Hr.  
Xtreme Gas Commercial Water Heaters are specifically designed to  
minimize the difficulty of replacing failed water heaters and are versatile for  
new installations. These products are designed for applications requiring  
large quantities of hot water.  
Construction Features:  
• Space saving tank design –  
maximizes installation adaptability  
by offering models with front side  
and rear side inlet/outlet water  
connections. Short heights and  
small jacket diameters result in  
greater installation flexibility.  
• Specialized burner  
assembly –  
each model features five premix  
burners mounted into a metal face  
plate and sealed with a Viton  
gasket. Patented “quick release”  
manifold for easier service.  
• Patented multi-flue tank design  
proprietary steel formulation,  
patented multi-flue design, and  
two coats of high temperature  
porcelain enamel to maximize  
corrosion resistance result in a  
superior heat exchanger design.  
• Spark-To-Pilot ignition system –  
Standard on all models. Provides  
reliable and energy saving ignition  
sequencing by igniting the pilot  
only when the thermostat calls  
for heat.  
• System SentinelLED  
diagnostic system –  
Our exclusive diagnostic system,  
with glowing LED lights, verifies  
system operation sequence  
by sequence.  
• Low profile automatic flue  
damper –  
low profile design minimizes over-  
all product height. Heavy duty vent  
hood supports are designed to  
withstand rigors of installation.  
GX90-550 and  
GX90-640 Comply  
With SCAQMD  
Rule 1146.2 for  
• Full port, full flow brass drain  
valve  
Low NO Emissions  
x
Small  
Jacket Diameters  
Short Floor-to-Vent  
Heights  
Certifications and Ratings:  
• Efficiency – these models have been tested according to ANSI test  
procedures, and exceed the thermal efficiency and standby loss  
requirements of current ASHRAE standards (Part of the Federally  
mandated Energy Policy Act (EPact)). Also exceeds energy efficiency  
codes of all states.  
Multiple Water  
Connection Options  
• Safety and construction – These products are design certified by U.L.:  
a) For operation at 180°F. b) To meet all safety and construction  
requirements of ANSI Z21.10.3-2001 c) As an automatic storage or  
instantaneous water heater. d) As an automatic circulating tank water  
heater. e) For operation on combustible floors and in alcove installations.  
CERTIFIED FOR A 150 PSI MAXIMUM WORKING PRESSURE  
(160 PSI FOR ASME MODELS).  
(On Selected  
Models)  
Continued next page.  
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Xtreme Gas continued.  
DIMENSIONAL DIAGRAM  
C
E
CLEARANCES TO  
COMBUSTIBLES  
MODEL  
T&P  
NUMBER  
UNITS  
inches  
mm  
SIDE  
4
REAR TOP  
OUTLET  
FRONT SIDE  
GX90-550  
4
102  
4
12  
305  
12  
305  
12  
305  
12  
305  
12  
305  
12  
305  
102  
4
GX90-640  
GX90-715  
GX90-500  
GX90-600  
GX90-680  
inches  
mm  
102  
102  
inches  
mm  
4
4
102  
4
102  
4
F B A  
INLET  
FRONT SIDE  
inches  
mm  
102  
102  
inches  
mm  
4
4
102  
4
102  
4
inches  
mm  
SYSTEM  
102  
102  
SENTINEL  
Allow a minimum of 18" (457mm) front clearance  
for servicing.  
2.5 Amps.  
D
G
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Xtreme Gas continued.  
Other Features:  
• Insulation – sag and moisture proof fiberglass  
insulation surrounds the storage tank to  
minimize heat loss.  
• Manual reset high limit – all models are factory  
equipped with a manual reset high limit to meet the  
code requirements of many states.  
• Anode rods – patented design utilizes multiple  
magnesium rods to ensure long life and  
corrosion resistance.  
• Gas control system – fully adjustable thermostat  
from 100°F to 180°F, 24 volt combination gas valve  
includes main gas pressure regulation,  
On-Off manual valve, 120/24 volt transformer, and  
high limit temperature cut-out.  
• Temperature and pressure relief valve –  
AGA/ASME rated and factory installed.  
Round premix burners – precision burners are  
formed from high chromium stainless steel.  
• Hand-hole cleanout – for removal of lime/  
sediment deposits.  
Recommended Specifications (for trade reference only)  
Water heater(s) shall be XTREME model ________________, manufactured by RHEEM-RUUD, having gas input  
of __________ Btu/hr. and a recovery rate of _____________ GPH at a 100°F temperature rise when tested and  
certified at ____________ thermal efficiency. Water heater(s) shall have a storage capacity of 90 gallons. Water  
heater(s) shall have the U.L. seal of certification and supplied with a factory installed AGA/ASME rated temperature  
and pressure relief valve. Tank(s) shall be furnished with a tube bundle having a double coating of high temperature  
porcelain enamel and furnished with magnesium anode rods rigidly supported. Water heater(s) shall meet or  
exceed the thermal efficiency and standby loss requirements of current ASHRAE standards. Tanks shall have a  
working pressure rating of 150 psi, and shall be completely factory assembled, including a pressure regulator  
properly adjusted for operation on ___________ gas with chromium stainless steel burners. Controls will be  
arranged for safety shutoff in event of pilot failure. Water heater(s) shall have front and rear side inlet/outlet water  
connections. Water heater(s) shall be covered by a three year limited warranty against tank leaks.  
Add “A” for ASME construction  
Water heater(s) shall be constructed in accordance with the requirements of the ASME Boiler and Pressure Vessel  
Code, Section IV Part HLW.  
Limited Warranty  
This product features a three year limited warranty against tank leaks. Please refer to Commercial  
Warranty Information brochure for complete warranty information.  
In keeping with its policy of continuous progress and product improvement, Rheem-Ruud reserves the right to make changes without notice.  
Rheem Water Heating • 101 Bell Road, Montgomery, Alabama 36117-4305 • www.rheem.com  
Rheem Canada Ltd./Ltée,128 Barton Street West, Hamilton, Ontario L8N 3P3  
PRINTED IN U.S.A  
07/07 WP  
FORM NO. RR102C-15 Rev. 4  
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