Raypak RAYTHERM LOW NOX User Manual
PART 1 - GENERAL
1.1 SUMMARY
A. Section includes gas-fired, copper finned-tube water heaters for use with a storage tank.
B. Related Sections
Specifier Note: Use as needed
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. National Fuel Gas Code
E. NEC
RAYTHERM® LOW NOX, TYPE WH
SUGGESTED SPECIFICATIONS
DIVISION 23 52 33.13
FINNED WATER-TUBE WATER HEATERS
Catalog No.: 3500.92D
Effective: 04-15-10
Replaces: 06-1-08
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 (0-55 PPM NOx emissions) water
heaters
B. Certifications
1. CSA
2. ASME HLW Stamp and National Board Listed
1.5 HEAT EXCHANGER WARRANTY
A. Limited five-year warranty from date of installation
B. Limited twenty-year thermal shock warranty from date of installation
C. Limited ten-year warranty for cupro-nickel heat exchangers only
PART 2 - PRODUCTS
2.1 MANUFACTURER
A. Raypak, Inc.
1. Contact: 2151 Eastman Ave., Oxnard, CA 93030; Telephone: (805) 278-5300;
Fax: (800) 872-9725; Web site: www.raypak.com
2. Product: Raytherm
®
Low NOx copper finned-tube water heater(s) (Models 181-401)
2.2 WATER HEATERS
Project Name / Date Division 23 52 33.13 - 1
A. General
1. The water heater(s) shall be fired with
2. The water heater(s) shall be CSA tested and certified with a minimum thermal efficiency of 82
percent at full fire.
3. The water heater(s) shall be ASME inspected and HLW-stamped and National Board
registered for 160 PSIG working pressure, complete with a Manufacturer's Data Report.
4. The water heater(s) shall have a floor loading of 70 lbs. /square foot or less.
B. Heat Exchanger
1. The heat exchanger shall be of a single-bank, horizontal-grid design with integral copper fin
tubes, each end of which is rolled into an ASME boiler-quality steel tube sheet.
2. The heat exchanger shall be sealed to 160 PSIG rated bronze headers with high temperature
silicone "O" rings.
3. The low water volume heat exchanger shall be explosion-proof on the water side and shall
carry a twenty-year warranty against thermal shock.
4. The headers shall be secured to the tube sheet by stud bolts with flange nuts to permit
inspection and maintenance without removal of external piping connections.
5. The heat exchanger shall incorporate “V” baffles, between the tubes, to ensure complete
contact of the external tube surfaces with the products of combustion.
6. The water heater(s) shall be capable of operating at inlet water temperatures as low as 105°F
without condensation.
7. The water heater(s) shall be designed to accommodate field changes of either left or right
hand plumbing and electrical while leaving the tube bundle in place.
8. The heat exchanger shall be AB-1953 compliant in construction and verification by a third
party certification agency.
C. Burners
1. The stainless steel alloy burners shall have lanced ports and slots, utilize multiport radial gas
orifices, and be capable of quiet ignition and extinction without flashback at the orifice.
D. Pilot Control System
1. The water heater(s) shall be equipped with a 100 percent safety shutdown system and an
electronic intermittent ignition system with electronic flame supervision having a nominal 0.8
second flame response time.
2. The ignition shall be Spark Ignition type with full flame rectification to ensure consistent
operation.
3. The igniter will be located away from the water inlet to protect the device from condensation
during startup.
4. The ignition control module shall include two LEDs that indicate flame presence and/or system
status.
E. Gas Train
1. The water heater(s) shall have dual-seated main gas valve(s).
2. Gas control trains shall have a redundant safety shut-off feature, main gas regulator, shut-off
cock and plugged pressure tapping to meet the requirements of ANSI Z21.10.3/CSA 4.3.
F. Water Heater Control
1. The following safety controls shall be provided:
a. High limit control
b. Flow switch, mounted and wired
c. ____PSIG ASME pressure relief valve, piped by the installer to an approved drain
d. Temperature and pressure gauge
2. The water heater(s) shall be equipped with an energy-saving pump control relay
(Economaster), mounted and wired, which automatically shuts off the water heater pump at a
set period after water heater shut-down (adjustable from three to ten minutes) to avoid
standby losses associated with constant pump operation.
G. Firing Mode
1. The water heater(s) shall be equipped to (a) or (b):
gas at a rated input of BTU/hr.
Project Name / Date Division 23 52 33.13 - 2
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