Raypak NH-208DV User Manual

COMMERCIAL, WATER-TUBE, GAS TANKLESS WATER HEATERS

MODELS

188 & 208

DV

PART 1 - GENERAL

1.1 SUMMARY

A. Section Includes Near-Condensing Gas-Fired, Copper Tube Tankless Water Heaters

Specifier Note: Use as needed

B. Related Sections

1. Building Services Piping – Division 22 11 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. 2006 UMC, Section 1107.6

C. ANSI/ASHRAE 15-1994, Section 8.13.6

D. National Fuel Gas Code, ANSI Z223.1/NFPA 54

E. National Electrical Code, ANSI NFPA 70

INSTANT-PAK®, TYPE NH

DIVISION 23 34 36.29

Catalog No.: 3500.82
Effective: 7/1/11
Replaces: New

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 (<20 PPM NOx emissions) water heaters

B. Certifications

1. CSA

2. NSF

3. SCAQMD

1.5 HEAT EXCHANGER WARRANTY

A. Five-year heat exchanger warranty in commercial applications

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: Instant-Pak ® Near Condensing Tankless Hot Water heater(s)

2.2 HEATERS

A. General

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

Project Name / Date Division 23 52 33.13 - 1

2. The heater(s) shall be CSA tested and certified with a minimum Energy Factor of .82 at full
fire.

3. The heater(s) shall have a maximum weight of 54 lbs. or less.

B. Heat Exchanger

1. The heat exchanger shall be a singular copper tube with serpentine nine pass design and
shall have integral copper walls extending into the combustion chamber for maximum
efficiency.

2. There shall be no banding material, bolts, gaskets or "O" rings in the header configuration. The
heat exchanger is removable from the cabinet for replacement without removing the entire
heater from the site.

3. The low water volume heat exchanger shall be explosion-proof on the water side.

4. The concentric flue connection and combustion air opening shall be located on the top of the
heater.

5. The gas connection, electrical connections, water connections shall be located on the bottom
of the heater.

C. Burners

1. The combustion chamber shall be of the sealed combustion type employing 11 Raypak high
temperature stainless steel ribbon burners, mounted onto a gas manifold.

2. The burner shall be a proprietary “Rich-Lean” design and constructed of high grade stainless
steel and must be capable of firing at both a complete blue flame with maximum gas and air
input as well as firing near 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 signal supplied directly from the
integrated modulating control, thereby electronically and precisely adjusting the volume of air
and gas supplied for combustion. Minimum fire shall be 6.25 percent of rated input.

D. Ignition System

1. The 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 to the side of the heat exchanger to protect the device from
condensation during start-up.

4. The ignition control module shall include a three segment LED display that indicates up to 6
individual diagnostic faults.

5. A viewing port shall be provided, (accessed after removal of front cover) permitting visual
observation of burner operation.

E. Gas Train

1. The heater(s) shall have dual-seated main gas valve.

2. Gas control trains shall have a redundant safety shut-off feature, main gas regulation, and
plugged pressure tapping to meet the requirements of ANSI Z21.10.3/CSA 4.3.

F. Heater Control

1. The following safety controls shall be provided:
a. High limit control with manual reset
b. Water Pressure switch, mounted and wired
c. Flame position based combustion and blocked flue sensor
d. Guardian OFW™ Overtemp breach protection safety device

2. The heater(s) shall be equipped with an integrated modulating temperature controller with a 3­segment LED display.

Project Name / Date Division 23 52 33.13 - 2