Dunkirk H2OI Single Coil Stainless Steel Indirect Water Heaters - Manual (Page 5)

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II. Pre-installation Considerations
Inspect shipment carefully for signs of damage. All equipment is carefully inspected and packed. Manufacturer’s
responsibility ceases upon delivery of the water heater to the carrier in good condition. Any claims for damage or
shortage, must be filed immediately against the carrier by the consignee. No claims for variances or shortages will be
allowed by the Manufacturer, unless they are presented within sixty days after receipt of the equipment.
Installation must conform to the requirements of the authority having jurisdiction. In the absence of such requirements,
installation must conform to the National Plumbing Code and the National Electrical Code ANSI/NFPA No. 70, current
edition.
IMPORTANT CONSIDERATIONS BEFORE INSTALLATION
1. Water Heater Sizing.
Choose the water heater model based on the expected water usage for the given site. The average residence
with one shower or more will require a Model 40 or larger. The Model 30 should only be considered for
residences with minimal water demand, or for commercial applications without showers. See Tables 2 and 3.
Consult ASHRAE sizing guides and other references.
Factors that increase water demand dramatically include high flow shower heads, hot tubs, and the use of more than one
shower at a time. Increase the tank size if these factors are present. Consult ASHRAE sizing guides and other references.
Dimensions, weights, ratings, and capacities are outlined in Table 1.
2. Boiler Sizing.
The water heater will provide the rated performance only if it is used with a boiler with a heating capacity of at least as
much as the capacity ratings in Tables 2 and 3. If the boiler has less capacity, the water heating output will be reduced.
NOTICE
If the boiler takes longer to heat up from a cold start, hot water shortage may occur.
The maximum heat transfers through the coil (heat input) of the water heaters at 240 deg.
F boiler supply temperature and 210 deg. F potable water temperature are as follows:
• Models 30 – 115 single coil units and models 60-D, 80-D, and 115-D dual coil units
are less than 96,000 BTU/HR.
• Models 80-HO, 115-HO, 80-HO-C, and 115-HO-C high output units are less than
84,000 BTU/HR.
• Models 85-XHO and 115-XHO, the extra high output series, are less than 175,000
BTU/HR.
Potable water temperature is limited to below 210 deg. F and nominal water containing
capacity is below 120 gallons for all indirect models.
Accordingly, per Part HLW-101.2, Section IV of the ASME Boiler and Pressure Vessel Code,
all indirect water heater products are exempt from compliance with the code.
Check with local codes for applicability