Raypak WH7-300A User Manual

STAINLESS STEEL DOMESTIC WATER HEATERS

XFYRE™, TYPE WH - MODELS 300A-850A

SUGGESTED SPECIFICATIONS

Catalog No.: 3500.81A
Effective: 04/05/13
Replaces: 12/01/09

PART 1 - GENERAL

1.1 SUMMARY
A. Section includes condensing gas-fired, stainless steel hot water supply Heaters

Specifier Note: Use as needed

B. Related Sections

1. Building Services Piping – Division 23 21 00

2. Breeching, Chimneys, and Stacks (Venting) – Division 23 51 00

3. HVAC Instrumentation and Controls – Division 23 09 00

4. Electrical – Division 23 09 33

1.2 REFERENCES
A. ANSI Z21.10.3/CSA 4.3
B. ASME, Section IV
C. 2006 UMC, Section 1107.6
D. ANSI/ASHRAE 15-1994, Section 8.13.6
E. National Fuel Gas Code, ANSI Z223.1/NFPA 54
F. NEC

DIVISION 22 34 36.23

1.3 SUBMITTALS
A. Product data sheet (including dimensions, rated capacities, shipping weights, accessories)
B. Wiring diagram
C. Warranty information
D. Installation and operating instructions

1.4 QUALITY ASSURANCE
A. Regulatory Requirements

1. ANSI Z21.10.3/CSA 4.3

2. Local and national air quality regulations for low NOx

B. Certifications

1. CSA

2. ASME, Section IV, H Stamp and National Board Listed

3. S.C.A.Q.M.D. rule 1146.2 (<20 PPM NOx emissions @ 3% O2)

4. CSA Certified – AB 1953 & VLA 193 Low Lead Compliant

1.5 HEAT EXCHANGER WARRANTY
A. Limited five-year heat exchanger warranty
B. Limited twenty-five-year thermal shock warranty

Project Name / Date Division 23 34 36.23 - 1

PART 2 - PRODUCTS

2.1 MANUFACTURER
A. Raypak, Inc.

1. Contact: 2151 Eastman Ave., Oxnard, CA 93030; Telephone: [phone];
Fax: [phone]; Web site: www.raypak.com

2. Product: XFyre™ condensing stainless steel hot water supply Heater(s)

2.2 HEATERS
A. General

1. Heater(s) shall be fired with gas at a rated input of BTU/hr.

2. Heater(s) shall be CSA tested and certified with a minimum thermal efficiency of 95 percent at
full fire.

3. Heater(s) shall be ASME inspected and stamped and National Board registered for 160 PSIG
maximum allowable working pressure and 210ºF maximum allowable temperature, complete
with a Manufacturer's Data Report.

4. Heater(s) shall have a floor loading of 95 lbs. /square foot or less.

B. Primary Heat Exchanger

1. The primary heat exchanger shall be of a helically wound, multi-pass design and shall
completely encircle the combustion chamber for maximum efficiency.

2. There shall be no banding material, gaskets or "O" rings in the header configuration. The heat
exchanger is removable from the cabinet for replacement without removing the entire heater
assembly from the site. The stainless steel combustion chamber shall be designed to have a
trough located on the bottom front and back section leading to the middle to ensure that
condensation does not collect in the Heater.

3. The low water volume primary heat exchanger shall be explosion-proof on the water side and
shall carry a twenty-five-year warranty against thermal shock.

4. The flue connection, combustion air opening, gas connection, electrical connections and
condensate drain shall be located on the rear. Water connections shall be located on the left
rear top of the unit.

C. Condensate Drain

1. Heater(s) will feature a condensate float switch which will shut down the Heater(s) if the
condensate drain is blocked.

D. Burners

1. The combustion chamber shall be of the sealed combustion type employing the Raypak high
temperature metal fiber burner, mounted in a horizontal orientation.

2. The burner shall be a premix design and constructed of high grade Inconel and must be
capable of firing at both a complete blue flame with maximum gas and air input as well as
firing infrared when gas and air are reduced. The burner must be capable of firing at 100% of
rated input when supplied with 4.0” WC of inlet gas pressure, so as to maintain service under
heavy demand conditions; no exceptions.

3. The burner shall use a combustion air blower to precisely control the fuel/air mixture for
maximum efficiency throughout the entire range of modulation. The combustion air blower
shall operate for a pre-purge period before burner ignition and a post-purge period after burner
operation to clear the combustion chamber.

4. The blower shall infinitely vary its output in response to a PWM signal supplied directly from
the Versa IC modulating control, thereby electronically and precisely adjusting the volume of
air and gas supplied for combustion. Minimum fire shall be 20 percent of rated input.

E. Ignition Control System

1. Heater(s) shall be equipped with a 100 percent safety shutdown.

2. The ignition shall be spark ignition type with full flame rectification by the ignition source, with a
three try-for-ignition sequence, to ensure consistent operation.

3. The igniter will be located above the burner to ensure easy ignition.

Project Name / Date Division 23 34 36.23 - 2