Table of Contents
Advertisement
6A
Hydronic piping
Near boiler piping components
1. Boiler system piping:
Boiler system piping MUST be sized per the pipe
requirements listed in Table 6A. Reducing the pipe size
can restrict the flow rate through the boiler, causing
inadvertent high limit shutdowns and poor system
performance.
2. Boiler circulating pump:
On Combi units only, an integral boiler circulating pump
is supplied by the factory. System piping must be sized to
meet the minimum requirements in Table 6A on page 35.
For boiler only models, a field supplied boiler circulating
pump must be installed. This circulator must be sized to
meet the specified minimum flow requirements listed in
Table 6B on page 40.
3. Boiler isolation valves:
Field supplied. Full port ball valves are required. Failure
to use full port ball valves could result in a restricted flow
rate through the boiler.
4. Check valves:
Field supplied.
Check valves are recommended for
installation as shown in FIG.'s 6-2 through 6-4 and 6-7
through 6-9. Failure to install check valves could result in
a reverse flow condition during pump(s) off cycle.
5. Unions:
Field supplied. Recommended for unit serviceability.
6. Temperature and pressure gauge:
Factory supplied. The temperature and pressure gauge is
shipped loose. It is the responsibility of the contractor to
install the temperature and pressure gauge on the boiler
water outlet.
7. Pressure relief valve:
Factory supplied. The pressure relief valve is sized to
ASME specifications. Install the 3/4" NPT fitting on the
top right side of the boiler (images in this manual show
relief valve installed).
8. Boiler purge valve:
Field supplied.
The boiler purge valve is used to
remove entrapped air from the heat exchanger during
start-up.
9. System temperature sensor (optional):
Factory supplied with the unit. The manufacturer offers
a system temperature sensor (100157718). The sensor is to
be installed in the heating loop downstream from the
boiler hot water piping and heating loop junction.
Typically the sensor will be located far enough downstream
to sense system diluted water temperature.
34
Installation & Service Manual
™
F I R E T U B E
⚠WARNING The National Standard Plumbing
Code, the National Plumbing Code of
Canada and the Uniform Plumbing
Code limit the pressure of the heat
transfer fluid to less than the minimum
working pressure of the potable water
system up to 30 psi maximum. Also,
the heat transfer fluid must be water
or other non-toxic fluid having a
toxicity of Class 1, as listed in Clinical
Toxicology of Commercial Products,
5
th
Edition.
10. Water Meter:
Field supplied. A water meter to monitor makeup
water is recommended. Makeup water volume should
not exceed 5% of total system per year.
11. Indirect water heater (Boiler Only):
The Epic Fire Tube may be piped to an indirect water
heater to heat domestic hot water with the space heat
transfer medium.
The space heating piping will branch off to flow
the space heat transfer medium through a single
wall heat exchanger coil inside the indirect water
heater.
The indirect water heater is connected to the boiler
supply/return piping.
Epic Fire Tube's control will regulate the flow of
water through the indirect water heater. The indirect
water heater's temperature will be regulated by the
Epic boiler's control or through a field supplied
Aquastat.
The Epic Fire Tube is pre-configured to control the
operation of the DHW pump with Domestic Hot Water
Prioritization programming. The DHW programming
is designed to control and balance the space heating
demand by switching between DHW and space heating.
Lochinvar offers the Squire which is a series of indirect
water heaters. The Squire features a stainless steel vessel
with a single wall stainless steel heat exchanger.
12. Y-Strainer:
Field
supplied.
A
multipurpose strainer is recommended at the inlet of
the heat exchanger to remove system particles from
older hydronic systems and protect newer systems.
A pump controlled by the
Y-strainer
or
equivalent
Advertisement
Table of Contents
