Install Instructions

28
4 Hydronic piping
Installation & Service Manual
9. Inspect the liquid level in the expansion tank. The system
must be full and under normal operating pressure to ensure
proper water level in the expansion tank. Ensure that
diaphragm type ex pan sion tanks are properly charged and
not water logged.
10. Start the boiler according to the Section 6 - “Start-Up
Instructions” in this manual. Operate the system, including
the pump, boiler and radiation units, for one hour.
11. Recheck the water level in the expansion tank. If it exceeds
half the tank volume, open the tank to reduce the water
level. Recheck pres sure charge on diaphragm type tanks.
12. Shut down the entire system and vent all ra di a tion units
and high points in the system.
13. Close the water makeup valve and check the strainer and
pressure reducing valve for sediment or debris. Reopen the
water makeup valve.
14. Verify system pressure with the boiler pres sure gauge
before beginning regular operation.
15. Within three days of start-up, recheck and bleed all air vents
and the expansion tank using these instructions.
TABLE - 4B
SYSTEM TEMPERATURE RISE CHART
Based on Boiler Output in Btu/hr
Btu/hr
20°F T 30°F T 40°F T
Input Output GPM Ft/hd GPM Ft/hd GPM Ft/hd
315,000 258,000 26.0 4.1 17.3 2.2 13.0 1.3
360,000 295,000 29.7 5.4 19.8 2.5 14.9 1.5
399,000 327,000 -- -- 22.0 3.6 16.5 2.0
500,000 410,000 -- -- 27.6 6.6 20.7 3.5
Piping of the Boiler System
The drawings in this section (see FIG’s 4-4 through 4-6)
show typical heating boil er piping installations. Before
beginning the in stal la tion, consult local codes for specific
plumb ing re quire ments. The installation should provide
unions and valves at the inlet and outlet of the boil er so it
can be isolated for service. The boiler cir cu lat ing pump, air
sep a ra tor, expansion tank and oth er components required
for proper installation must be purchased locally. An air
separation device must be supplied in the in stal la tion piping
to eliminate trapped air in the system. Lo cate a system
air vent at the highest point in the sys tem. The system
must also have a properly sized expansion tank installed.
Typically, an air charged di a phragm-type expansion tank
is used. The expansion tank must be installed close to the
boiler and on the suction side of the system pump to ensure
proper op er a tion. A water meter to monitor makeup water
is recommended. Makeup water volume should not exceed
5% of total system per year. Install a Y-strainer or equivalent
multi-purpose strainer just before the boiler pump at the
inlet of the heat exchanger. This item is used to remove
system debris from older hydronic systems and to protect
newer systems.
⚠ CAUTION
This boiler system should not be
operated at less than 12 PSIG (83 kPa)
(Non-metallic system piping must have
an oxygen barrier to be considered a
closed loop).