Rheem GX90-640, GX90-550 User Manual

Xtreme High-Input Gas Commercial Water Heaters

Available in 90 Gallon Tank-Type Models

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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:

GX90-550 and

GX90-640 Comply

With SCAQMD Rule 1146.2 for

Low NOxEmissions

Small

Jacket Diameters

• 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 overall 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 diagnostic system –

Our exclusive diagnostic system, with glowing LED lights, verifies system operation sequence by sequence.

• Full port, full flow brass drain valve

LED

Short Floor-to-Vent

Heights

Multiple Water

Connection Options

(On Selected

Models)

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 WORKING PRESSURE (160 PSI FOR ASME MODELS).

Continued next page.

Xtreme Gas continued.

DIMENSIONAL INFORMATION All Dimensions Shown in English and Metric.

WATER CONNECTIONS APPROXIMATE

MODEL FRONT REAR NUMBER UNITS

ABCDEFG SIDE SIDE STD. ASME

GX90-550(A) inches 74.5 68 30 25 10 59 12 2905 945