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6
Water Piping and Trim
2. Flow Switch (Required) – A flow switch is
required in lieu of manual reset low water
cutoff (LWCO) for forced circulation coil-type
water boilers to prevent overheating and
heat exchanger failure in accordance with
requirements of ASME Boiler and Pressure
Vessel Code, Section IV, and ANSI/ASME CSD-
1 – latest edition, "Controls and Safety Devices
for Automatically Fired Boilers".
The flow switch is factory provided. Follow
Section 6, Paragraph A and Section 7
'Electrical' of these instructions to install and
wire the flow switch.
3. Circulator (Required) – Usually at least two
circulators will be required to properly install
an Apex boiler. See Paragraph B above for
information on sizing the circulators.
4. Expansion Tank (Required) – If this boiler
is replacing an existing boiler with no other
changes in the system, the old expansion tank
can generally be reused. If the expansion tank
must be replaced, consult the expansion tank
manufacturer's literature for proper sizing.
5. Fill Valve (Required) – Either manual
(recommended) or automatic fill valve may be
used. However, if automatic refill is employed,
a water meter must be added to evaluate the
makeup water volume taken after initial fill
and eliminate any water leakage as early as
possible.
6. Automatic Air Vent (Required) –At least one
automatic air vent is required. Manual vents will
usually be required in other parts of the system
to remove air during initial fill.
106308-05 - 3/23
(continued)
Figure 6-7: Boiler Head Loss
APEX
Installation, Operating, & Service Instructions
7. Manual Reset High Limit - Apex boilers have
factory provided UL 353 listed boiler control
and UL 1434 listed manual reset high limit.
An optional manual reset external high limit is
available from Thermal Solutions to meet local
code requirements.
8. Y-strainer (Recommended) – A Y-strainer or
equivalent strainer removes heating system
debris from hydronic systems and protects
boiler heat exchanger from fouling. Install
the strainer downstream of full port isolation
valve at the inlet side of the circulator for easy
service.
9. Flow Control Valve (Strongly Recommended)
– The flow control valve prevents flow through
the system unless the circulator is operating.
Flow control valves are used to prevent gravity
circulation or "ghost flows" in circulator zone
systems through zones that are not calling for
heat.
10. Isolation Valves (Strongly Recommended) –
Isolation valves are useful when the boiler must
be drained, as they will eliminate having to
drain and refill the entire system.
11. Drain Valve (Required) – Drain valve is
packaged loose with boiler and must be
installed in the location shown in Figure 6-1
or 6-6 "Factory Supplied Piping and Trim
Installation".
12. An optional LWCO with manual reset is
available from Thermal Solutions to meet local
code requirements.
45
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