Rheem Xtreme GX90-550 User manual

( n Selected
Models)
GX90-550 and
GX90-640 Comply
With SCAQMD
Rule 1146.2 for
Low NOxEmissions
Small
Jacket Diameters
Short Floor-to-Vent
Heights
Multiple Water
Connection Options
• 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.
• 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.
• 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.
• 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.
• 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 Sentinel™LED
diagnostic system –
ur exclusive diagnostic system,
with glowing LED lights, verifies
system operation sequence
by sequence.
• Full port, full flow brass drain
valve
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:
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.
• 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 WOR ING PRESSURE
(160 PSI FOR ASME MODELS).
Continued next page.

WATER CONNECTIONS APPROXIMATE
MODEL FRONT REAR SHIPPING WEIGHT
NUMBER UNITS ABCDEFG SIDE SIDE STD. ASME
GX90-550(A) inches 74.5 68 30 25 10 59 12 2905 945
mm 1892 1727 768 635 254 1509 25.4 51 51 905 945
GX90-640(A) inches 74.5 68 30 25 10 59 12 2905 945
mm 1892 1727 768 635 254 1509 25.4 51 51 905 945
GX90-715(A) inches 74.5 68 30 25 10 59 12 2905 945
mm 1892 1727 768 635 254 1509 25.4 51 51 905 945
GX90-500(A) inches 74.5 68 30 25 10 59 12 2905 945
mm 1892 1727 768 635 254 1509 25.4 51 51 905 945
GX90-600(A) inches 74.5 68 30 25 10 59 12 2905 945
mm 1892 1727 768 635 254 1509 25.4 51 51 905 945
GX90-680(A) inches 74.5 68 30 25 10 59 12 2905 945
mm 1892 1727 768 635 254 1509 25.4 51 51 905 945
All Models Require a 120V Power Source. (A) Suffix Indicates ASME Tank Construction Available.
MODEL INPUT BTU/HR. THERMAL 40°F 50°F 60°F 70°F 80°F 90°F 100°F 110°F 120°F 130°F 140°F
NUMBER NATURAL & L.P. EFFICIENCY UNITS 22°C 28°C 33°C 39°C 45°C 50°C 56°C 61°C 67°C 72°C 78°C
GX90-550(A) 550,000 NAT 80% GPH 1333 1067 889 762 667 593 533 485 444 410 381
LPH 5047 4037 3364 2884 2523 2243 2019 1835 1682 1553 1442
GX90-640(A) 640,000 NAT 80% GPH 1551 1241 1034 887 776 690 621 564 517 477 443
LPH 5873 4698 3915 3356 2936 2610 2349 2135 1958 1807 1678
GX90-715(A) 715,000 NAT 80% GPH 1733 1387 1156 991 867 770 693 630 578 533 495
LPH 6561 5249 4374 3749 3280 2916 2624 2386 2187 2019 1875
GX90-500(A) 500,000 LP 80% GPH 1212 970 808 693 606 539 485 441 404 373 346
L.P. LPH 4588 3670 3059 2622 2294 2039 1835 1668 1529 1412 1311
GX90-600(A) 600,000 LP 80% GPH 1455 1164 970 831 727 647 582 529 485 448 416
L.P. LPH 5506 4404 3670 3146 2753 2447 2202 2002 1835 1694 1573
GX90-680(A) 680,000 LP 80% GPH 1649 1319 1099 942 824 733 659 599 550 507 471
L.P. LPH 6240 4992 4160 3565 3120 2773 2496 2269 2080 1920 1783
Recovery ratings are based on thermal efficiencies obtained in a CSA certified laboratory. Recovery rate shown on the rating
plate (80%) Thermal Efficiency in accordance with ANSI Z21.10.3 labeling requirements. (A) indicates available ASME model.
RECOVERY CAPACITIES Recovery in U.S. Gallons/Hr. (GPH) and Liters/Hr. (LPH) at Various Temperature Rises.
DIMENSIONAL INFORMATION All Dimensions Shown in English and Metric.
MODEL TAN CAPACITY INPUT BTU/HR. TEMP. 5 10 15 20 30 45 60 120 180 Min. to Rec.
NUMBER
GALLONS LITERS NAT. & L.P. RISE UNITS Min. Min. Min. Min. Min. Min. Min. Min. Min. Contents
GX90-550(A) 90 341 550,000 NAT 100°F GAL 107 152 196 241 330 463 596 1130 1663 10
37.7°C LTR. 407 575 743 911 1248 1752 2257 4276 6294
GX90-640(A) 90 341 640,000 NAT 100°F GAL. 115 166 218 270 373 529 684 1304 1925 9
37.7°C LTR. 434 630 826 1022 1413 2000 2587 4936 7285
GX90-715(A) 90 341 715,000 NAT 100°F GAL. 121 179 236 294 410 583 756 1450 2143 8
37.7°C LTR. 457 676 894 1113 1551 2207 2863 5487 8111
GX90-500(A) 90 341 500,000 LP 100°F GAL. 103 144 184 225 305 427 548 1033 1518 11
L.P. 37.7°C LTR. 391 544 697 850 1156 1615 2073 3909 5744
GX90-600(A) 90 341 600,000 LP 100°F GAL. 112 160 209 257 354 499 645 1227 1809 9
L.P. 37.7°C LTR. 422 606 789 972 1340 1890 2441 4643 6845
GX90-680(A) 90 341 680,000 LP 100°F GAL. 118 173 228 283 393 558 722 1382 2041 8
L.P. 37.7°C LTR. 446 654 862 1070 1486 2110 2886 5230 7726
Xtreme Gas continued.
MAXIMUM DELIVERY In U.S. Gallons and Liters. (Includes useable storage and recovery for indicated times.)

E
C
G
F
D
BA
OUTLET
FRONT SIDE
INLET
FRONT SIDE
SYSTEM
SENTINEL
T&P
4412
102 102 305
4412
102 102 305
4412
102 102 305
4412
102 102 305
4412
102 102 305
4412
102 102 305
GX90-550 inches
mm
GX90-640 inches
mm
GX90-715 inches
mm
GX90-500 inches
mm
GX90-600 inches
mm
GX90-680 inches
mm
CLEARANCES TO
COMBUSTIBLES
MODEL
NUMBER UNITS SIDE REAR TOP
DIMENSIONAL DIAGRAM
Allow a minimum of 18" (457mm) front clearance
for servicing.
2.5 Amps.
Xtreme Gas continued.

• Insulation – sag and moisture proof fiberglass
insulation surrounds the storage tank to
minimize heat loss.
• Anode rods – patented design utilizes multiple
magnesium rods to ensure long life and
corrosion resistance.
• Temperature and pressure relief valve –
AGA/ASME rated and factory installed.
• Hand-hole cleanout – for removal of lime/
sediment deposits.
• Manual reset high limit – all
models are factory
equipped with a manual reset high limit to meet the
code requirements of many states.
• Gas control system – fully adjustable thermostat
from 100°F to 180°F, 24 volt combination gas valve
includes main gas pressure regulation,
n- ff manual valve, 120/24 volt transformer, and
high limit temperature cut-out.
• Round premix burners – precision burners are
formed from high chromium stainless steel.
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.
Xtreme Gas continued.
Other Features:
Rheem Water Heating • 101 Bell Road, Montgomery, Alabama 36117-4305 • www.rheem.com
Rheem Canada Ltd./Ltée,128 Barton Street West, Hamilton, ntario L8N 3P3
P R I N T E D I N U. S . A 0 7 / 0 7 W P F R M N . R R 1 0 2 C - 1 5 R e v. 4
In keeping with its policy of continuous progress and product improvement, Rheem-Ruud reserves the right to make changes without notice.