Thrush DSVE Series - Manual (Page 17)

Thrush Co.
Manual #9636-0550
4.2 Installation (Continued)
1. Connect the cold water source to the water side connection port. Be sure the
upstream manual shutoff valve is in the closed position. If an in-line check valve
or back flow preventer is used, a suitable expansion tank must be installed in the
hot water outlet side of the unit. (Figure 4-4)
2. Connect the hot water outlet piping to the hot water outlet port located in the top of
the Hot-Pak. Be sure the downstream manual shutoff valve is in the closed
position. (Figure 4-4)
3. Connect the steam piping to the steam inlet port (Figure 4-4).
Any temperature control valve installed on the Hot-Pak should be of the
fail-closed design.
The temperature control valve should be installed per the valve manufacturer’s
instructions. A 1 ¼” NPT connection for the temperature sensing element is
located beneath the relief valve connection.
A safety solenoid should be installed on the temperature control valve pilot or
pneumatic control and connected to the control panel. Terminal connections for a
safety solenoid are provided on the terminal strip of the control panel. For a direct
acting temperature control valve, a normally closed solenoid valve is usually
used. For a pneumatic type control valve, a three-way solenoid is usually used.
A strainer and drip leg should be installed on the inlet side of the temperature
control valve. The strainer should be oriented such that condensate cannot
puddle in the body.
4. Connect a properly sized steam trap to the condensate drain of the Hot-Pak. The
trap should be installed with an isolation valve for maintenance purposes. A
strainer and a dirt leg should also be installed on its inlet side. Float and
thermostatic steam trap assemblies can be ordered from Thrush. A float and
thermostatic type steam trap is recommended for a modulating type of service for
use as a water heater. If the condensate is under pressure or sufficient height is
not available to allow condensate drainage, a pumping trap or another form of
condensate removal may be required.
5. Once all connections outlined above have been performed, the unit is ready for
the initial startup procedure.
4.2.1 Water Quality
Thrush recommends a water test to ensure adequate water hardness levels between
17 ppm and 103 ppm (1 grain and 6 grains per gallon). Do not use deionized water.
Damage to the Hot-Pak caused by water quality is not covered by warranty.