Smith GT-150, Installation, Operating And Maintenance Manual

Page: 11 / 40

GT INSTALLATION AND OPERATION INSTRUCTIONS Page 11
The following are important rules that must be followed
when constructing the condensate system:
1. Connect the condensate trap to the drain using
1/2 in , 13 mm , silicone, rubber, reinforced nylon, or
PEX tubing. Long runs must be properly pitched
and supported to prevent blockage.
2. Do not use nylon tubing, as it will collapse, blocking
drainage. This could damage the boiler.
3. Do not seal the opening between the condensate pipe
and the condensate drain pipe, Figure 19. In the event
of a blocked drain the opening will allow the condensate
to overfl ow and prevent the boiler from fl ooding.
4. Never have the drain pipe higher than the hole in the
back cabinet, this will fl ood the boiler.
5. Never allow the drain to freeze or become blocked.
This will cause condensate to fill the combustion
chamber resulting in a no heat condition and damage
to the boiler.
6. NEVER use copper, steel, or galvanized piping in
the construction of the condensate system.
7. When a condensate pump is used or required, select
a pump that is designed for residential furnaces.
GENERAL PLUMBING GUIDELINES
If connecting this boiler to a system containing cast iron
radiation, be sure to add a strainer to the system to trap
any sediment that may dislodge. Failure to do this could
harm the heat exchanger and void the warranty! The
use of non-oxygen barrier radiant tubing is acceptable,
provided that non-ferrous pipe, valves, and fi ttings are
used throughout the entire hydronic system.
CAUTION: All heating system piping must be
installed in accordance with the ANSI/ASME Boiler
and Pressure Vessel Code, Section IV. All applicable
local codes and ordinances must also be followed. If
the boiler is installed above any radiation elements
it must be fitted with a low water cutoff device
installed above the normal boiler water level!
CAUTION: This boiler must have adequate water
flowing through it whenever the burner is on.
Failure to do this will damage the unit and void the
warranty!
CAUTION: All systems must be fl ushed to remove
sediment, flux, filings and other foreign matter.
Use products such as Fernox “Superfl oc” for new
installations and CHR “Central Heating Restorer”
for retrofits. Also add an inhibitor to the system
water to prevent limestone and magnetite deposits
from forming and to protect the boiler from galvanic
corrosion. An inhibitor such as CHP, “Central Heating
Protector” from Fernox is recomended. DO NOT
connect this boiler to a system that contains any
cast iron radiation or non oxygen barrier radiant
tubing. Failure to comply with these instructions will
seriously damage the boiler, voiding warranty!
CAUTION: The boiler fittings cannot support any
weight. The plumbing system must be supported by
the building structure. A wrench must be used to
hold the boiler fi ttings when installing the heating
system piping. Failure to do so can seriously damage
the boiler, voiding warranty!
The GT hot water boiler comes from the factory ready
to be piped to the heating system. Each boiler is
equipped with a safety relief valve which must be piped
in accordance with the ANSI/ASME Boiler and Pressure
Vessel Code, Section IV, see Figure 20.
WARNING: Never install any type of valve
between the boiler and the relief valve or an
explosion causing extensive property damage,
severe personal injury or death may occur!
Figure 20 - Relief Valve Piping
The GT boiler must be used only in a Primary/Secondary
pumping system to avoid cycling problems in systems
that have poor flow or heating zones with very small
capacities. An
1 1/4 in , 32 mm , primary loop system must
be used in all cases, regardless of the confi guration of
the secondary system design.
Understand and follow the plumbing requirements
provided in this section. Keep serviceability in mind when
installing plumbing around the boiler cabinetry. Install
fi ttings that will allow the system to be fl ushed if needed
during annual check-ups. An inhibitor to the system water
to prevent lime and magnetite deposits from forming, and
to protect the boiler from galvanic corrosion. A minimum
clearance of
1 in , 25 mm must be maintained between
heating system pipes and all combustible construction.
All heating system piping must be supported by suitable
hangers not the boiler. The thermal expansion of the
system must be considered when supporting the system.
A minimum system pressure of
12 psig , 84 kPa must
be maintained.