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Section 1
General Information
1A.
Introduction
This manual provides information for the
installation and operation of Natco volume water
heaters. It is strongly recommended that all
application and installation procedures be reviewed
completely before proceeding with the installation.
Consult the Natco factory, or local factory
representative, with any problems or questions
regarding this equipment. Experience has shown that
most problems are caused by improper installation.
Some accessory items are shipped in separate
packages. Verify receipt of all packages listed on the
package slip. Inspect everything for possible damage
upon delivery, and inform the carrier of any shortages
or impairments. Any such claims should be filed with
the carrier. The carrier, not the shipper, is responsible
for shortages and damage to the shipment whether
visible or concealed.
IMPORTANT WARNING:
All volume water heaters must be installed in
accordance with the procedures outlined in this
manual. The warranty does not apply to heaters not
installed or operated in accordance with these
procedures. Consult local building and safety codes
before proceeding with work. The installation must
conform to the requirements of the authority having
jurisdiction or, in the absence of such requirements, to
the latest edition of the National Fuel Gas Code;
ANS1 Z223.1, National Electrical Code ANSI/NFPA
70 and/or in Canada CAN1-B149 requirement.
Figure 1 – Boiler Configuration
When required by the authority having jurisdiction, the
installation must conform to American Society of
Mechanical Engineers safety codes for controls and
safety devices for automatically fired heaters No.
CSD-1, and in Canada CGA 3.3. Any modification to
the water heater, its gas controls, gas orifices, wiring
or draft diverter may void the Natco warranty. If field
conditions require such modifications, consult factory.
1B.
Heater Identification
Consult rating plate on the heater. The following
example simplifies the heater identification.
1
P W
1 6 7 0
(1)
Basic heater model.*
(2)
Input rate X 1000 BTU/hr.
(3)
Indoor (I) or Outdoor (E) installation.
(4)
Gas type: Natural (N) or Propane (P).
(5)
Ignition system: I.I.D. (09) or continuous pilot
(16).**
(6)
Firing rate: On/Off (C), 2-stage (K), 4-stage (L),
or Mech. Mod (H).
*Model VW water heaters for use with separate
storage tank. There must be a field installed pump to
circulate water between the heater and the storage
tank.
*Model PW water heaters are basically the same as
the VW series except that the PW heaters come with
integrally mount pumps.
*Model IW water heaters are tankless instantaneous
heaters, complete with mount pump for use in
applications having a suitable diversity in heater load.
**Special Options: I.I.D. (04) 115 volts or I.I.D. (08)
IRI Controls
Natco commercial water heaters are available in
two models: an indoor version and an outdoor
version. Both are available from the factory. See
Figure 1.
3
2
3
4
5
6
I
N
09
L
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