48
VI. Water Piping and Trim C. Standard Installation Requirements (continued)
C. Standard Installation Requirements.
Observe the following guidelines when making the
actual installation of the boiler piping:
1. Safety Relief Valve (Required) - The relief valve is
packaged loose with boiler and must be installed in
the location shown in Figure 35 “Factory Supplied
Piping and Trim Installation”. The relief valve
must be installed with spindle in vertical position.
Installation of the relief valve must comply with
ASME Boiler and Pressure Vessel Code, Section IV.
The standard factory shipped relief valve is rated
for 50 PSI maximum working pressure. Optional
80 PSI and 100 PSI maximum working pressure
rated relief valves are available. If the valve is to be
replaced, the replacement valve must have a relief
capacity equal or exceeding the boiler AHRI Gross
Output rating (model APX500). Pipe the relief valve
discharge to a location where hot water or steam will
not create hazard or property damage if the valve
opens. The end of the discharge pipe must terminate
in an unthreaded pipe. If the relief valve is not
piped to a drain, it must terminate at least 6” above
the oor. Do not run relief valve discharge piping
through an area prone to freezing. The termination
of discharge piping must be in an area where it will
not become plugged by debris.
WARNING
Safety relief valve discharge piping must be
piped such that the potential of severe burns
is eliminated. DO NOT pipe in any area where
freezing could occur. DO NOT install any shut-off
valves, plugs or caps. Consult Local Codes for
proper discharge piping arrangement.
2. Circulator (Required) – Usually at least two
circulators will be required to properly install a
Apex™ Series boiler. See Paragraph B above for
information on sizing the circulators.
3. 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.
4. Fill Valve (Required) – Either manual
(recommended) or automatic ll valve may be used.
However, if automatic rell is employed, a water
meter must be added to evaluate the makeup water
volume taken after initial ll and eliminate any
water leakage as early as possible.
5. 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 ll.
6. Manual Reset High Limit (Required by some
Codes) - This control is required by ASME CSD-1
and some other codes. Install the high limit in the
boiler supply piping just above the boiler with no
intervening valves. Set the manual reset high limit
to 200°F. Wire the limit per Figures 44 and 45A, in
Section VIII “Electrical”.
7. Y-strainer (Recommended) – A Y-strainer or
equivalent strainer removes heating system debris
from hydronic systems and protects boiler heat
exchanger from fouling up. Install the strainer
downstream of full port isolation valve, at the inlet
side of the circulator, for easy service.
8. Flow Control Valve (Strongly Recommended) –
The ow control valve prevents ow through the
system unless the circulator is operating. Flow
control valves are used to prevent gravity circulation
or “ghost ows” in circulator zone systems through
zones that are not calling for heat.
9. Isolation Valves (Strongly recommended) –
Isolation valves are useful when the boiler must be
drained, as they will eliminate having to drain and
rell the entire system.
10. Drain Valve (Required) – Drain valve is packaged
loose with boiler and must be installed in the
location shown in Figure 35 “Factory Supplied
Piping and Trim Installation”.
11. Low Water Cutoff (Required by some Codes) –
LWCO with harness and LWCO transformer are
available as optional components. Order Complete
Kit (Part No. 102097-01) when required.
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