Thrush DSHE User Manual
(Horizontal Model)
Semi-Instantaneous Water Heater
Steam to Water Design
Manual # 9636-0555 Rev. B
Operation&MaintenanceManual
340West8thStreet
Peru,IN46970
PH:765‐472‐3351
FX:765‐472‐3968
www.thrushco.com
COPYRIGHTTHRUSHCO.,INC.2014
Thrush Co.
Table of Contents
Section No. Description Page No.
1 General Product Information 1
2 Safety Information/Warnings 2-3
3
Component and Operational Information 4-10
4 Installation, Initial Startup and Operation 11-19
5 Maintenance Information 20-22
6 Electrical Drawings 23-25
7 Parts Ordering/Contact Information 26
THIS DOCUMENT CONTAINS INFORMATION THAT THRUSH DEEMS CONFIDENTIAL AND PROPRIETARY.
THE BASIC THRUSH PRODUCT REVEALED IN THIS DOCUMENT IS PATENTED, AS ARE CERTAIN PRODUCT
COMPONENTS. IN CONSIDERATION FOR THE RECEIPT OF THIS DOCUMENT, RECIPIENT AGREES NOT TO
REPRODUCE, COPY, USE OR TRANSMIT THIS DOCUMENT OR THE INFORMATION CONTAINED HEREIN, IN
WHOLE OR IN PART, OR TO PERMIT OTHERS TO DO SO, FOR ANY PURPOSE WITHOUT FIRST OBTAINING
THE EXPRESS WRITTEN PERMISSION FROM THRUSH.
COPYRIGHT THRUSH CO., INC. 2014
Manual #9636-0555
Thrush Co.
Manual #9636-0555
Section 1
General Product Information
1.1 Overview
The Thrush Hot-Pak® has been carefully assembled and factory tested to provide years
of trouble-free service. This manual provides information to allow the installer/operator to
install, operate, service and maintain the Hot-Pak. In this manual the installer/operator
will find that multiple Hot-Pak models are covered. Visually these different models will
look very similar. The main difference between models is the height and diameter of the
unit. The model number designates the size of the unit (Figure 1-1 Overview). Although a
standard configuration is shown throughout this manual, optional equipment is available.
36"
MAX.
STEAMINLET
CONDENSATE
DRAIN
ModelDesignation
DSHE‐642
No.ofTubePasses
BundleLength(FT)
BundleDiameter(IN)
ExtendedSurfaceArea(Optional)
HorizontalDesign
SteamtoWater
DoubleWallConstruction(Optional)
TEMPERATURESENSOR
OPENAREAOF
LASTBAFFLE
WATERINLET
CONNECTION
Figure 1-1 Overview
SAFETYRELIEFVALVE
WATEROUTLET
Shell
Jacket
Insulation
TubeBundle
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Section 2
Safety Information/Warning
2.1 Safety Information
Practical safety features have been incorporated into the design and manufacture of the
Thrush Hot-Pak. If questions are not answered by this manual, or if specific installation,
operation, and/or maintenance procedures are not clearly understood, contact your
Thrush representative before proceeding. Personnel qualified for use with steam
equipment must, at all times, observe all safety regulations while performing
maintenance or repairs.
All installation, operation, and maintenance procedures should be performed by
experienced, trained, personnel. The Hot-Pak utilizes steam, boiler water, or high
temperature water under pressure as well as electricity. The potential exists for severe
personal injury or death if proper procedures are not followed.
Manual #9636-0555
Because this is an automatic valve, hot (potentially scalding) water could be
released without warning.
Water will be very hot, potentially scalding, causing serious bodily injury.
With any piece of equipment utilizing steam, boiler water, high temperature water
under pressure, and electricity, there is a potential for severe personal injury or
death if proper installation, operation and maintenance procedures are not
followed.
There is a potential for severe personal injury or death if proper rigging
procedures are not followed. Rigging should be done with proper
equipment and qualified personnel.
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Manual #9636-0555
2.1 Safety Information continued
Before making any piping connections, assure that all piping is clean and free of
any foreign material such as debris or scale. Foreign material in the piping can
cause damage to the unit and/or affect the performance and operation. Manual
shutoff valves should be installed upstream/downstream from all connections to
act as an isolation device. These valves should be in the closed position and
remain so until the installation is complete.
Any temperature control valve installed on the Hot-Pak should be of the fail-closed
design.
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.
To protect the tube bundle from damage, the unit must be filled with water before
allowing steam to enter.
When shutting down, always shut off the hot fluid first.
The support stand was designed to aid the installation process of the Hot-
Pak into system piping. The support stand is not a replacement for system
piping supports. System piping must be supported before and after the Hot-
Pak in conjunction with the support stand.
Thrush Co.
Section 3
Component and Operational Information
3.1 Component Identification
The following paragraphs contain functional descriptions for each of the major
components of a standard Thrush Hot-Pak. This manual provides information for multiple
Hot-Pak models. All the components listed have the same functional purpose throughout
each model. Although a standard Hot-Pak will be used for illustrations, optional
equipment will also be shown for reference.
Manual #9636-0555
Figure 3-1 Components
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Manual #9636-0555
3.1.1 Safety Relief Valve
The safety relief valve is a valve that automatically relieves pressure on the inside of the
shell (also known as the water side). If the temperature or pressure inside the shell
exceeds a specified setting, the valve will open. Field installation is required for the
safety relief valve and also requires an adequate drain be piped to the discharge side of
the valve. (Figure 3-2)
Because this is an automatic valve, hot (potentially scalding) water could be
released without warning.
Figure 3-2 Safety Relief Valve
3.1.2 Temperature Gauge
The temperature gauge is a visual representation of the temperature inside the shell
(or water side). It can be used as a reference when setting the temperature aquastat.
(Figure 3-3)
Figure 3-3 Temperature Gauge
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3.1.3 Temperature Aquastat
The temperature aquastat limits the temperature of water inside the shell. The aquastat
must be set 15 degrees higher than the maximum operating temperature. If the water
temperature exceeds this limit, the aquastat sends a signal to the solenoid valve to dump
the overheated water. (Figure 3-4)
Figure 3-4 Temperature Aquastat
3.1.4 Solenoid Valve
The solenoid valve is an electrically actuated valve that dumps overheated water. The
solenoid valve must be piped to an adequate drain. If water inside the shell exceeds a
predetermined set point on the temperature aquastat, the aquastat sends a signal to this
valve telling it to open. The valve will then discharge the overheated water to a drain.
(Figure 3-5)
Manual #9636-0555
Water will be very hot, potentially scalding, causing serious bodily injury.
Figure 3-5 Solenoid Valve
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