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Type of Surface
Combustible Surfaces
Recommended Service Clearance
† "C" dimension includes clearance to remove the burner. Do not put pipes, ducts, etc. in this area above the boiler.
* CSA minimum. Actual clearance depends upon venting requirements.
** Service access need be only on one side of a boiler or row of boilers.
Boilers may be installed immediately adjacent to each other. However, Harsco Industrial, Patterson-
Kelley recommends this clearance between each boiler when there is insufficient access at the rear to
allow for service and adjustment.
vertical clearances.
In Canada: The boilers are approved for installation with zero clearance to combustible surfaces, but 24
inch service clearances are recommended.
3.4
E
C
LECTRICAL
ONNECTIONS
The boiler is wired for 120 volts, single phase, 60 hertz. The electrical connections should be made in
the junction box on the rear of the boiler. The total operating amperage is indicated on the rating
nameplate. The 700 and 1000 series require less than 8 amps; while the 1500, 1700, 2000 series
requires less than 12 amps. Before starting the boiler, check to ensure that the proper voltage and
amperage is connected to the boiler.
An external electrical disconnect (not supplied with the boiler) with adequate overload protection is
required. The boiler must be grounded in accordance with local codes or in the absence of such
requirements, in the U.S. with National Electrical Codes, ANSI/NFPA No. 70, latest edition and in
Canada, wire according to the current Canadian Electrical Code, Part I, CSA C22.1.
NOTICE! A dedicated earth ground (green wire) is required to avoid nuisance shutdowns. Do not
ground through the conduit. It is also important that proper polarity be maintained.
3.5
I
A
E
NLET
IR AND
3.5.1 Applicable Codes & Standards
CODES
United States:
NFPA 54/ANSI Z223.1
NFPA/ANSI 211
Canada
CAN/CSA B149.1
STANDARDS
Bumping hazard from overhead ducts! Install all components with adequate
V
XHAUST
ENTING
National Fuel Gas Code
Chimneys, Fireplaces, Vents and Solid Fuel Burning Appliances
Installation Codes for Gas Burning Equipment
Dimensions (inches)
A
B
30
24*
30
24
11
®
P-K THERMIFIC
Gas-Fired Boiler
C†
D
30
24
30
24**
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