Thrush DSHE Series - Manual (Page 18)

Thrush Co.
Manual #9636-0555
4.2 Installation (Continued)
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.
4.3 Initial Startup Procedure
Before starting the Hot-Pak, all equipment should be inspected for proper installation.
Any equipment that appears to be damaged or any installation errors should be
corrected before any water, steam or electricity is supplied.
When starting up, always introduce the cold fluid first. Introduce the hot side fluid
slowly. Bring the unit from ambient temperature up to operating temperature
gradually. Do not introduce hot or cold fluids suddenly, which could damage the
unit and void the warranty. A qualified electrician should make all electrical
connections.