PeerlessBoilers PBC-34, Installation, Operation & Maintenance Manual

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i. Use closely spaced tees, less than 4 pipe
diameters apart.
ii. Use a low loss header system or a hydronic
separator such as a Caleffi 548 series.
b. Central Heat Circulator- A properly sized
circulator should be installed to provide heat out
to the system off of the Primary secondary header.
Piping Recommendations:
- Use 6 wraps of Teflon tape on the supply and
return connections if using a direct NPT
adapter.
- Use two 45° elbows to offset the CH piping
either in front of or behind the domestic water
piping. This allows for easy installation of a
shutoff and cleaning kit along with a domestic
relief valve.
c. PB Heat recommends treating the boiler loop
water with water treatment products such as those
made by Sentinel, Fernox, or other equivalent
water treatment systems to help extend the lifetime
of the heat exchangers.
2. Domestic Water Piping
a. The installer supplied temperature limiting device
must be installed consistent with local, national,
and international plumbing codes as well as the
device manufacturer’s instructions.
b. Additional temperature limiting devices may be
required at the domestic water fixtures in the
dwelling.
c. Choose the lowest practical DHW setpoint.
d. The domestic hot water can be piped directly off
of the structure’s main cold water supply.
e. It is required to install a filtration/water treatment
system before the boiler to protect the plate heat
exchanger from scale build up. This is good
practice even in areas with high quality water to
extend the life of the heat exchanger PB Heat
recommends products such as those made by
ScaleCutter
®
(shown in Figure 4.5) or other
equivalent water treatment systems to improve the
water quality before it enters the boiler.
f. A properly sized safety relief valve (not provided) is
required on the domestic outlet side of the boiler.
g. A drain valve should be located immediately
before the domestic inlet and after the domestic
outlet of the boiler. This allows for easy flushing
and descaling of the plate heat exchanger. A set of
shutoff valves should be placed before the
domestic inlet drain valve and after the domestic
outlet drain valves as well in order to isolate the
rest of the domestic supply to the structure (as
shown in Figure 4.7). Domestic water service
valve kits, like Webstone kit 4443WPR or other
similar valve kits, meet the needs listed above.
Flow Restriction:
All Series PBC™ boilers contain a built-in flow
restrictor on the domestic water side of the boiler.
This restrictor protects the flow sensor from
abnormal wear and contains a screen filter to
protect against large sediment. Regular
maintenance of this screen is recommended. See
Section 11 for further maintenance instructions.
The Flow restrictor is sized at 4.75 gallons per
minute. If it is found that an application for the
PBC-52™ requires additional DHW flow rate, the
flow regulator can be removed if the following
conditions are met:
1. An inline filter is installed prior to the Domestic
Inlet connection of the unit.
2. DHW flow rate is limited to 6.5 GPM or below
through the boiler by some means.
E. FREEZE PROTECTION
1. Glycol for hydronic applications is specially formulated
for heating systems. It includes inhibitors which prevent
the glycol from attacking metallic system components.
Make sure that the system fluid is checked for correct
glycol concentration and inhibitor level.
2. Use only inhibited polypropylene glycol solutions of
up to 50% by volume. Ethylene glycol is toxic and
can chemically attack gaskets and seals used in
hydronic system.
3. The anti-freeze solution should be tested at least once
per year and as recommended by the manufacturer of
the product.
4. Anti-freeze solutions expand more than water. For
example, a 50% by volume solution expands 4.8%
with a 148°F temperature rise while water expands
about 3% for the same temperature increase.
Allowance for this expansion must be considered in
sizing expansion tanks and related components.
5. The flow rate in systems utilizing glycol solutions
should be higher than in a water system to
compensate for decreased heating capacity of the fluid.
WATER PIPING AND CONTROLS
Series PBC™
Model
Boiler Input
Btu/hr (kW)
Gross Output
Btu/hr (kW)
PBC-34™ 80,000 (23.4) 76,000 (22.3)
PBC-40™ 100,000 (29.3) 95,000 (27.8)
PBC-52™ 120,000 (35.2) 114,000 (33.4)
Table 4.2: Series PBC™ Series Heating Input and
Gross Outputs
⚠
DANGER
– Water temperatures over 125°F
– (52°C) can cause severe burns
– instantly, or death from scalds.
– Children, the disabled, and the
– elderly are at the highest risk of
– being scalded.
– Feel water before bathing or showering.
– Read this manual in its entirety before setting
domestic hot water setpoint.
– A temperature limiting device (listed to ASSE 1070
or ASSE 1017) is required.