Install Instructions

A. GENERAL
1. Size water supply and return piping in accordance
with system requirements. Do not use smaller
diameter piping than the boiler connections.
2. If the P
UREFIRE
®
boiler is used to replace an existing
boiler, make sure the system piping is thoroughly
cleaned and free from debris before installing this
boiler. Sentinel Performance Solutions
(http://www.sentinel-solutions.net/us/) offers a full line
of cleaners (X300), sludge remover (X400), antifreeze
(X500) and corrosion inhibitors (X100/X500) for
hydronic applications.
3. In hydronic systems where sediment may exist, install
a strainer in the boiler return piping to prevent large
particles and pipe scale from entering the boiler heat
exchanger. Use a large mesh screen in the strainer.
4. Install this boiler so that the gas ignition system
components are protected from water (dripping, spraying,
etc.) during operation and service (circulator replacement,
condensate trap cleaning, sensor replacement, etc.).
5. The P
UREFIRE
®
heating boiler is intended for use in a
closed-loop hydronic system. Leaks in the piping
system may require constant make-up water which
may include oxygen, calcium and other substances
which may cause corrosion, calcium scale buildup, or
other attack on the hydronic system piping. The
system water should have a pH value of between 8.2
and 9.5. The water hardness is to be maintained
between 50 ppm CaCO
3
(3 gr/gal) and 150 ppm
CaCO
3
(9 gr/gal). Also, a minimum water pressure of
5 psi is required for proper performance.
B. OPERATING PARAMETERS
1. The PUREFIRE
®
boiler is designed to operate in a
closed loop hydronic system under forced circulation.
This requires the system to be completely filled with
water and requires a minimum water flow through the
boiler to operate effectively.
2. The minimum system pressure is 14.5 psig (100 kPa).
3. Table 4.1 lists the minimum flow rates for each P
UREFIRE
®
model. If a glycol solution is to be used, contact your PB
Heat, LLC representative for minimum flow rates.
Section 4.E provides detailed information about using
glycol for freeze protection.
Table 4.2 provides the water volume of the heat
exchanger including the supply and return pipes that
are attached at the factory.
C. SYSTEM COMPONENTS
Figure 4.1 shows the symbol key for piping diagrams in
this section. The following are brief descriptions of system
components.
1. Pressure/Temperature Gauge: A combination
pressure/temperature gauge is provided with each
P
UREFIRE
®
boiler to be mounted in the piping from the
boiler supply to the system as shown in Figure 4.2 &
4.3. Most local codes require this gauge.
2. Air Elimination: Closed loop hydronic systems require
air elimination devices. As the system water is heated,
dissolved oxygen and other gases will separate from
the liquid. An air elimination device (such as a TACO
Vortech
®
Air Separator) is required to remove the
dissolved gases preventing corrosion in the piping
system and eliminating noise.
3. Expansion Tank: An expansion tank (such as a Bell &
Gossett Series HFT) is required to provide room for
expansion of the heating medium (water or glycol
solution). Consult the expansion tank manufacturer's
instructions for specific information regarding
installation. The expansion tank is to be sized for the
required system volume and capacity. In addition, be
sure that the expansion tank is sized based on the
proper heating medium. Glycol solutions may expand
more than water for a similar temperature rise.
WATER PIPING AND CONTROLS
4. WATER PIPING & CONTROLS
Use only inhibited propylene glycol solutions which
are specifically formulated for hydronic systems.
Unlike automotive antifreeze, solutions for hydronic
applications contain corrosion inhibitors that will
protect system components from premature failure
due to corrosion.
CAUTION
Use only inhibited propylene glycol solutions which
are specifically formulated for hydronic systems.
Ethylene glycol is toxic and may cause any
environmental hazard if a leak or spill occurs.
WARNING
PUREFIRE
®
Model
Minimum Flow Rate
Water
GPM (LPM)
50% Glycol Solution
GPM (LPM)
PF-50 2.2 (8.3) 2.8 (10.6)
PF-80 3.3 (12.5) 4.1 (15.5)
PF-110 4.4 (16.7) 5.5 (20.8)
PF-140 5.5 (20.8) 6.8 (25.7)
PF-210 5.5 (20.8) 6.8 (25.7)
PF-399 13.2 (50.0) 16.5 (62.5)
Table 4.1: Minimum Flow Rate
PUREFIRE
®
Model
Total Water Capacity
Gallons (Liters)
PF-50 0.62 (2.35)
PF-80 0.72 (2.73)
PF-110 0.89 (3.37)
PF-140 1.25 (4.73)
PF-210 1.19 (4.50)
PF-399 2.60 (9.84)
Table 4.2: Heat Exchanger Water Capacity
17