Armstrong FLO-RITE-TEMP 8120DW Installations- und Einstellungsanweisungen - Seite 3
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3.
An Armstrong Y-strainer should be installed
before the pressure reducing valve to reduce the
chance of dirt fouling.
4.
If an externally piloted pressure reducing valve is
used, the control pipe should be pitched away
from the PRV and installed at the pressure gauge
on the shell of the heat exchanger.
5.
A steam safety relief valve should be used prior to
the heat exchanger if either or both of the
following conditions exist. (1) If the maximum
steam pressure could exceed the minimum water
pressure in the tubes, or (2) The maximum steam
pressure could exceed 150 psig (the maximum
steam pressure rating of the shell).
IMPORTANT -Steam supply pipe size
coming to the heat exchanger should NOT be
smaller than the steam connection supplied on
the heater, otherwise steam flow could be
restricted. If a pressure reducing valve is used,
D
1.
An 18 inch minimum thermal loop should be piped into the water inlet and outlet of the FLO-RITE-TEMP
and should be located as close to the mixing valve as possible (See Fig. 3-1A). These loops will act as a
thermal check valve or heat trap to prevent the conduction of heat through the water from the unit during
inactive times.
2.
Isolation valves and hose connections added to both the inlet and outlet water supplies will allow for
Clean-In-Place equipment to be utilized.
3.
Use pipe unions on both the water inlet and outlet to allow ease of water heater mixing valve removal for
maintenance and removal of the tube bundle for cleaning (See Fig. 3-1A).
4.
For adjusting the unit, an isolation valve and hot water by-pass to drain should be installed close to the unit
October 31, 2002 @ 3:15 pm
WATER PIPING INSTALLATION
(Follow same plumbing for DW units)
A
C
B
C
E
B
installation should be as close as possible to the
Flo-Rite-Temp. Downstream piping from the
Pressure Reducing Valve should be expanded
immediately after the PRV to accomodate the
expanded volume of steam.
6.
To vent start-up air, an Armstrong Thermostatic
Air Vent is included and installed on the top
connection, opposite the trap drain connection of
the heat exchanger. This discharge can be piped
to drain or the floor if preferred.
7.
Install a vacuum breaker in the piping between the
heat exchanger drain connection and the steam
trap. This will prevent improper draining of the
heat exchanger caused by a possible vacuum
forming when the steam is shut off.
8.
Install a suitable steam pressure gauge in the 1/4"
coupler located in the top mid section of the heat
exchanger shell. This gauge will help diagnose
pressure problems should they occur. This port
may also be used for a PRV external control pipe
if a PRV is required.
F
A
Fig. 3-1
3