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Natco Fire-Coil Volume Water Heaters
SECTION 1.
General Information
1A. Introduction
This manual provides installation, operating, and
maintenance instructions for Fire Coil Volume Water
Heaters, Sizes 175 through 400. Review all application
and installation procedures completely before
proceeding with the installation. Experience has
shown that most operating problems are caused by
improper installation.
The Fire-Coil heaters are offered in a basic
configuration (see Figure 1). On PW heaters the pump
is factory installed. On VW heaters the pump is field
installed.
1B. Warranty
The Fire-Coil heaters are sold with a limited
factory warranty. Details are specified on the back
cover of this manual.
TOP VIEW
A
8-1/2 in.
(216mm)
INLET OUTLET
Gas Connection
Size
Nat.
Propane
Size
in.
mm
in.
175
3
/
19
1
/
4
2
250
3
/
19
1
/
4
2
3
1
325
/
19
/
4
2
400
3
/
19
1
/
4
2
Note: Dimensions may vary.
Figure 1. General configuration.
SIDE VIEW
B
30-3/16 in. (767mm)
Water
Connect.
Size
A
mm
in.
mm
in.
13
1
1
/
38
18
2
13
1
1
/
38
22
1
/
2
2
1
3
13
1
/
38
26
/
2
4
13
1
1
/
38
31
3
/
2
4
Make all warranty claims to an authorized Natco
representative or directly to the factory. Claims must
include the heater serial number and model (this
information can be found on the rating plate),
installation date, and name of the installer. Shipping
costs are not included in the warranty coverage.
Some accessory items are shipped in separate
packages. Inspect everything for damage immediately
upon delivery, and advise the transporter of any
shortages or damage. Any such claims should be filed
with the transporter. The transporter will not accept a
claim from the shipper, Natco.
The warranty does not cover damage caused by
improper installation, operation, or field modification.
1C. Technical Assistance
Consult Natco or your local wholesaler with any
questions or problems involving the specification,
installation and operation of Natco equipment. An
experienced technical support staff is ready to assist in
V
OPTIONAL
VENT CAP FOR
OUTDOOR USE
DRAFTHOOD MUST
C
BE INSTALLED IN
THE FIELD
INLET
5-1/2 in.
(140mm)
26-1/2 in.
(673mm)
U.S. Only
B
(Outdoor)
mm
in.
mm
in.
457
26
1
/
673
14
1
/
2
16
572
31
787
18
1
/
16
3
3
679
35
/
908
19
/
4
16
806
40
1
/
1022
22
5
/
4
8
DRAFTHOOD
C
HEADER
LOCATION
OUTLET
40-9/16 in. (1030mm)
C
C
(Indoor)
mm
in.
mm
in.
357
23/
597
2
473
24
3
/
629
4
7
488
25
/
657
8
575
26
7
/
683
8
Page 1
V
Vent
Dia.
mm
6
152
7
178
8
203
9
229
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