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3.7.5.2
Hot Water Supply Boiler Application (D-Series)
A hot water supply boiler is designed to operate in an open system. The water quality should be within
the guidelines established by the National Sanitation Foundation (NSF) or the local water authority
guidelines.
Ideally hardness should be between 1 grain and 6 grains per gallon (between 17 ppm and 103 ppm).
Use of excessively hard water may cause premature failure due to buildup of scale; such failure is not
covered by warranty. Scale can also reduce efficiency. For example, a scale thickness of 1/16" will
result in a 12.5% loss of efficiency.
Do not use deionized water. The amount of oils, fats, grease, and other organic matter should be limited
to 10 ppm.
The flow for a D-series boiler should be within the top half of the range specified in Section 3.7.1.1.
These ranges are:
Model #
D700
D1000
D1200
D1500
D1700
D2000
Consult your water conditioning supplier for analysis and recommendations.
3.8
P
-S
C
RE
TART
HECK
Before attempting to start the boiler, make sure the following items have been completed.
1. Inspect the burners to be sure nothing was damaged or knocked loose during shipment. Make
sure that the mixer core in the top of the burner is centered in the burner head. Inspect the pilot
line, main gas train and ignition electrode to be sure they were not damaged during shipment or
installation. Check to see that the pilot is securely attached and that it is properly positioned to
ignite the main burner
2. Flue gas from the boiler is properly vented (refer to Section 3.5).
3. Gas connection has been made, pressure tested for leakage, and the line purged of air. Make
sure all required bleeds and vents have been installed (refer to Section 3.6).
4. Water connections are complete, and the boiler and system have been filled and purged of air
(refer to Section 3.7).
5. Check boiler pump rotation and make sure the direction of water flow through the boiler is correct
(refer to Section 3.7.2).
6. The boiler must be connected to a 120 volt / 60 Hz power source with proper polarity and
dedicated ground. Provide a disconnect having adequate overload protection (refer to Section
3.4).
Minimum Flow
Maximum Flow
83
120
90
120
95
120
120
150
125
150
135
150
L
IST
P-K THERMIFIC
33
®
Gas-Fired Boiler
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