Drash D-1000B Manual

D-1000B HEATER
Outdoor Use Only
OPERATIONS & MAINTENANCE MANUAL
33 Kings Highway, Orangeburg, NY 10962 Phone: [phone]
ISO 9001: 2000 Registered
Quality Management System
Fax: [phone]
Hotline: [phone]
DHS Manual Part Number: 1002811 Web: www.drash.com
Original Issue: 31 MARCH 2009 Email: [email protected]

Revision History
Date Revision Description
03/31/09 1002811 Original Issue.
This manual contains privileged and confidential information proprietary to DHS Systems, LLC and is intended solely for
use by its customers. No portion of this document may be reproduced for release to a third party without written consent
of DHS Systems, LLC. Additional copies of this manual are available from DHS Systems, LLC.
Copyright © 2009, DHS SYSTEMS LLC

TABLE OF CONTENTS
1. GENERAL...................................................................................................................................................1-1
1.1 Scope.....................................................................................................................1-1
1.2 Receipt of the D-1000B Heater ..............................................................................1-1
1.3 Equipment Description...........................................................................................1-1
1.4 Major Components.................................................................................................1-3
1.4.1 Shell...........................................................................................................................................1-3
1.4.2 Fuel Tank...................................................................................................................................1-3
1.4.3 Combustion Chamber................................................................................................................1-3
1.4.4 Burner Head ..............................................................................................................................1-3
1.4.5 Electric Motor.............................................................................................................................1-3
1.4.6 Control System..........................................................................................................................1-3
1.4.7 Performance..............................................................................................................................1-4
1.4.8 Auxiliary Equipment...................................................................................................................1-4
1.5 Specifications.........................................................................................................1-4
2. SAFETY......................................................................................................................................................2-1
2.1 Scope.....................................................................................................................2-1
2.2 Qualified Personnel................................................................................................2-1
2.3 Signal Words and Labels .......................................................................................2-1
2.3.1 Danger.......................................................................................................................................2-1
2.3.2 Warning .....................................................................................................................................2-1
2.3.3 Caution ......................................................................................................................................2-1
2.3.4 Important....................................................................................................................................2-1
2.4 General Precautions...............................................................................................2-1
2.4.1 Heater........................................................................................................................................2-2
2.4.2 Safety Protections .....................................................................................................................2-2
3. STORAGE & TRANSPORT.......................................................................................................................3-1
3.1 Scope.....................................................................................................................3-1
3.1.1 Transport and Storage...............................................................................................................3-1
3.2 Storage...................................................................................................................3-1
3.2.1 Before storing ............................................................................................................................3-1
3.2.2 After storing ...............................................................................................................................3-1
3.3 Shipping .................................................................................................................3-1
4. OPERATIONS ............................................................................................................................................4-1
4.1 General ..................................................................................................................4-1
4.2 Control Panel..........................................................................................................4-1
4.3 Start Up Procedure for Normal Operations ............................................................4-1
4.4 Start Up Procedures for Cold Weather Operations ................................................4-2
4.5 Start Up Procedures for High Altitude Operations (4500’/1500m)..........................4-2
4.6 Shut Down Procedure............................................................................................4-2
4.7 Filling the Fuel Tank...............................................................................................4-3
5. MAINTENANCE, and REPAIR PROCEDURES........................................................................................5-1
5.1 General ..................................................................................................................5-1
5.2 Maintenance...........................................................................................................5-1
5.2.1 Periodic Maintenance................................................................................................................5-1
5.2.2 Daily Maintenance.....................................................................................................................5-1
5.2.3 50 Hour Maintenance................................................................................................................5-1
5.2.4 Annual Maintenance..................................................................................................................5-2
5.3 Servicing the Fuel Tank..........................................................................................5-2
5.4 Repairs Procedures................................................................................................5-2
5.4.1 General Access .........................................................................................................................5-2
5.4.2 Removal and Installation Electric Motor Assembly ...................................................................5-3

5.4.3 Removal and Installation of the Condenser (Capacitor) ........................................................... 5-5
5.4.4 Removal and Installation of Fuel Filter...................................................................................... 5-6
5.4.5 Removal and Installation of Fuel Pump Assembly.................................................................... 5-7
5.4.6 Removal, Inspection and Installation of Electric Motor / Fuel Pump Coupling ......................... 5-8
5.4.7 Removal and Installation of Fuel Solenoid.............................................................................. 5-10
5.4.8 Removal and Installation of Fuel Nozzle................................................................................. 5-11
5.4.9 Removal and Installation of Ignition & Control Components................................................... 5-12
5.4.10 Removal and Installation of the Transformer and High Temp (H.T.) Leads........................... 5-13
5.4.11 Removal and Installation of the Photocell............................................................................... 5-15
6. TEST PROCEDURES................................................................................................................................ 6-1
6.1 Maintenance Repair Test Procedures ................................................................... 6-1
6.2 Thermostat / CO Detector Control Device Test..................................................... 6-1
6.3 Smoke Test ........................................................................................................... 6-1
6.4 Fuel Pressure Test ................................................................................................ 6-2
7. TROUBLESHOOTING............................................................................................................................... 7-1
7.1 General.................................................................................................................. 7-1
7.2 D-1000B Heater..................................................................................................... 7-1
8. ILLUSTRATED PARTS BREAKDOWN....................................................................................................8-1
8.1 D-1000B Heater Exploded Detail........................................................................... 8-1
8.2 Burner Head and Nozzle Assembly Exploded View .............................................. 8-2
8.3 Fuel Pump Assembly Exploded View.................................................................... 8-3
8.4 Pre-Heated Fuel Filter Exploded View................................................................... 8-4
8.5 Control Panel Assembly Exploded View................................................................ 8-5
8.6 Parts List for Exploded View of D-1000B Heater................................................... 8-6
8.7 Heater Sub-Assembly, Skid Body and Heater..................................................... 8-10
8.8 Skid Body Assembly, Heater D-1000B................................................................ 8-11
8.9 D-1000B Heater Accessories .............................................................................. 8-12
9. WARRANTY............................................................................................................................................... 9-1
9.1 Equipment and/or Documentation Feedback Form ............................................... 9-2

D-1000B Heater Operations & Maintenance
1. GENERAL
1.1 Scope
This Operator’s Manual describes the safe operation and field maintenance of the DRASH D-1000B heater.
1.2 Receipt of the D-1000B Heater
Once the unit has been uncrated, immediately write the model and serial number in the space provided below.
Model Number__________________ Serial Number_____________________
Inspect for signs of obvious or concealed freight damage. If damage exists, immediately file a claim with the
transportation company. Be sure that all damaged parts are replaced and that the mechanical and electrical problems
are corrected prior to operation of the unit. If you require service, contact DHS Customer Service (Phone: 800-977-
3647, Fax: [phone], or Email: [e-mail] ). Please have the model and serial number available for all
service calls.
Manufacturer Data Plate
and DRASH Serial Number
Location
Figure 1-1 – Model & Serial Number Location
1.3 Equipment Description
THIS EQUIPMENT IS INTENDED FOR OUTDOOR USE ONLY
WARNING!
The D-1000B model is a compact and mobile, indirect fuel fired air heater that uses 120 volts, 60 Hz input power which
burns JP8, Diesel #1 and Diesel #2 fuel. The heater contains a stainless steel dual Combustion Chamber, a Fuel Pump
and an Electric Motor. A fan, which is mounted on the forward side of the motor, propels additional air into the
combustion chamber as well as around the outside of the chamber. The air which flows around the chamber is heated
through contact with the chamber exterior walls and is sent out of the heater. The air used in the chamber for combustion
is expelled through the exhaust stack. The D-1000B heater was designed for simple maneuverability (wheel-able and
equipped with snow slides). The heaters are stackable for maximum storage efficiency.
GENERAL 1-1 DHS SYSTEMS LLC
No rights are conveyed except as indicated in the legend on the inside front cover of this document.

D-1000B Heater Operations & Maintenance
Maintenance Access Panel
Exhaust Stack
Heat Outlet
Skid Body
Pre-Heated
Fuel Filter
Manufacturer Data Plate
and DRASH Serial
Number Location
Top Cover
Air Intake
Fuel Cap / Tank
Power Cord
Control Panel
Accessory Bag
Compartment
Accessory Bag
Compartment
Figure 1-2 - D-1000B Heater
GENERAL 1-2 DHS SYSTEMS LLC
No rights are conveyed except as indicated in the legend on the inside front cover of this document.

D-1000B Heater Operations & Maintenance
ACCESSORY BAG
Figure 1-3 – Heater Duct Connection
1.4 Major Components
1.4.1 Shell
The D-1000B Heater features a two-piece, molded polymer composite outer body that is rust-resistant and shockproof.
The upper cover quickly detaches for service to the combustion chamber, electric motor, or fuel pump assembly by
removing four pins as shown in Figure 5-1.
1.4.2 Fuel Tank
The fuel tank is made of steel and is corrosion proof. The fuel tank has an internal fuel level indicator gauge cap and a
drain plug located underneath the fuel tank. Fill tank with JP8, Diesel #1 or Diesel #2 fuel. Fuel tank capacity is 10.8 US
Gallons (41 Liters).
1.4.3 Combustion Chamber
The D-1000B has a dual combustion chamber made of stainless steel and is fully welded to provide clean warm air. The
heater is equipped with ten seconds pre-ventilation cycle to “clean” the combustion chamber once the heater is turned off;
a post ventilation time is automatically regulated by the fan thermostat. During this time the combustion chamber
temperature decreases and this free heat is blown into the area.
1.4.4 Burner Head
The burner head contains the fuel nozzle, dual electrodes, ignition cables and a flame detector.
1.4.5 Electric Motor
The electric motor drives the fuel pump assembly and a fan which propels additional air into the combustion chamber.
1.4.6 Control System
The D-1000B heater has all operational controls located in a watertight control panel mounted on the side of the unit. The
control panel consists of a 3-positioned switch for power, normal operation and thermostat operation, an outlet to connect
the remote thermostat / CO detector and a reset button. The control system utilizes a safety shut-off switch if flame is not
detected, a high temperature switch if ducts become blocked and a safety shut-off switch upon detecting 100ppm of CO
content.
GENERAL 1-3 DHS SYSTEMS LLC
No rights are conveyed except as indicated in the legend on the inside front cover of this document.

D-1000B Heater Operations & Maintenance
GENERAL 1-4 DHS SYSTEMS LLC
No rights are conveyed except as indicated in the legend on the inside front cover of this document.
1.4.7 Performance
With a water-tight control panel, the D-1000B heater was designed to operate in all different types of environmental
conditions. A pre-heated fuel filter allows heater to work at extreme low temperatures. When operating the D-1000B
heater, the noise level when measured at a distance of 3’ (Ft) from the control panel is 76dB. With the remote thermostat
/ CO detector attached, the heater may be operated remotely from within the shelter. The D-1000B has a fuel
consumption rate of 0.81 US Gallon per hour (GPH), approximately 12 hrs of continuous run-time without refueling.
1.4.8 Auxiliary Equipment
Each D-1000B heater will include the following auxiliary equipment:
An exhaust stack.
Two heater ducts (supply and return); 12”dia x 15’ length with transport bags.
A remote control Thermostat / CO (Carbon Monoxide) Detector with a 26’ power cord.
An Operational and Maintenance Manual.
1.5 Specifications
Color: Green
Overall Dimensions:
Length: 53.2 inches.
Width: 23.8 inches.
Height: 32.3 inches with exhaust stack installed (29.5 inches without exhaust stack).
Flue Diameter: 5.9 inches.
Weights:
Dry: 165 lbs (without accessories).
Wet: 242 lbs.
Heater Ducts: 27 lbs each.
Input Power:
Voltage: 120V, 60Hz.
Power Consumption: 520W.
Fuse: 10A.
Heat Input Capacity: 110,000 BTU/hr.
Air Flow: 880 CFM.
Nozzle: 0.60 - 80°S.
Pump Pressure: 170 psi.
Fuel System:
Tank Capacity: 10.8 US Gallon (41 liters).
Fuel Types: JP8, Diesel #1 and Diesel #2.
Certification:
CSA B140.0-03 & B140.8-1967 Certified.
UL 733 Compliant.

D-1000B Heater Operations & Maintenance
2. SAFETY
2.1 Scope
This chapter contains general information for the safe operation and maintenance of the D-1000B heater.
The cautions and warnings point out known conditions that are
potentially hazardous. However, no manual can cover every
possible situation. If in doubt, contact DHS.
Before calling DHS for assistance, please identify the heater
by its DRASH assigned serial number, (see Section 1.2
Receipt of your D-1000B Heater) or the serial number is
located on the Manufacturer decal. (See Figure 1-1).
Service and repairs should be performed only by authorized
DHS technicians.
2.2 Qualified Personnel
For the purposes of this manual, a qualified person is one who is familiar with this manual, the operation of the specific
equipment and the hazards involved in operation and maintenance. This manual is not intended to be a substitute for
proper training. We strongly recommend that operators receive training directly from DHS.
Phone: [phone]
Fax: [phone]
Email: [email protected]
IMPORTANT
READ ALL OF THE INFORMATION CONTAINED IN THIS MANUAL BEFORE
OPERATING THE HEATER.
DHS Systems Contact Information
2.3 Signal Words and Labels
Signal words and labels are used throughout this manual. The words and symbols convey the following advice:
2.3.1 Danger
Danger refers to immediate hazards that will result in severe personal injury or death.
2.3.2 Warning
Warning refers to a hazard or unsafe method or practice that may result in severe personal injury or death.
2.3.3 Caution
Caution refers to a hazard or unsafe method or practice that may result in equipment damage or personal injury.
2.3.4 Important
Important refers to a hazard or unsafe method or practice that can result in equipment damage.
2.4 General Precautions
PLEASE REMEMBER SAFETY FIRST. If you are not sure of the instructions or procedures, contact DHS before
continuing.
This manual emphasizes the safety precautions necessary during the operation and maintenance of your heater. Each
section has caution and warning messages. These messages are for your safety and the safety of the equipment
involved. If any of the cautions or warnings is not readily understood, contact DHS before proceeding.
When an abnormal condition is observed and procedures in the manual do not specifically cover the condition, work
should be stopped. Contact DHS for assistance. An authorized DHS technician will provide guidance on the abnormal
condition before any work can be continued.
SAFETY 2-1 DHS SYSTEMS LLC
No rights are conveyed except as indicated in the legend on the inside front cover of this document.

D-1000B Heater Operations & Maintenance
2.4.1 Heater
The following safety precautions should be observed:
The D-1000B heater must be used OUTDOORS ONLY.
Always follow local ordinances and codes when using this heater.
Always remove the fabric covers from each end of the heater before operating.
Operate the heater outdoors; upright with the exhaust stack attached and away from flammable or explosive
materials (the minimum distance must be 6.5 ft / 2 m).
Ensure fire extinguisher / equipment is readily available.
Unplug heater when not in use.
Before performing any maintenance or repair work, you must:
Turn the power switch to the off position.
Wait for the heater to cool down.
Unplug the heater from the power supply.
These safety precautions are necessary to prevent serious personal injury or death.
Keep the heater enclosure clean and cleared of any debris within the shell.
Ensure the stack and ducts are clear of any obstructions that would restrict airflow.
Do not operate heater without the top cover properly installed.
Do not operate the heater without the fan properly installed.
Ensure your body and clothing stay clear of all moving parts.
Immediately stop the heater and fix any fuel leaks.
Do not perform maintenance while the heater is operating.
CAUTION
Keep all solvents, cleaners or flammable liquids away. Adequate ventilation must be
available. Avoid breathing vapors. Avoid fire, explosion, and any other health
hazards. Always use protective equipment to prevent personal injuries to the head,
face, eyes, hands, and feet.
2.4.2 Safety Protections
The D-1000B heater has the following safety devices installed:
Flame Detector Safety Shut-off Switch: In case of the flame extinguishing, the safety shut-off switch will cut in
and stop the heater; at the same time the reset button will illuminate (See Figure 4-1, Item #1).
High Temperature Limit Switch: If the heater ducts become blocked (exceeding 250°F), the high temperature
limit switch shuts down the heater.
CO Safety Shut-off Switch: This safety shut-off switch will shut down the heater upon detecting 100 PPM of
Carbon Monoxide.
Thermostatic Safety Switch (TSS): When the heater is switched off, the TSS assures that the fan continues to
run until the surface temperature of the combustion chamber drops, assuring a safe restart.
Fan Pressure Switch: When the fan stops working, this device disables ignition and cuts fuel supply.
SAFETY 2-2 DHS SYSTEMS LLC
No rights are conveyed except as indicated in the legend on the inside front cover of this document.

D-1000B Heater Operations & Maintenance
3. STORAGE & TRANSPORT
3.1 Scope
The D-1000B heater is designed for outdoor use only. No special packaging is required for storage or transport.
3.1.1 Transport and Storage
IMPORTANT
The owner of the Heater is responsible for investigating local ordinances, applicable
laws, codes and regulations concerning the transportation of Diesel fuel and or JP8.
Before the D-1000B heater is transported or placed in storage, the heater must be totally cooled off. Before moving the
heater, the heater’s power switch must be in the OFF (O) position and unplugged. Ensure the following equipment is
installed and attached to the heater before transporting or storing.
Store the exhaust stack inside the fabric cover with straps which covers the heat outlet.
Protective (fabric) covers are placed on the air inlet and heat outlet area.
Repack and place the Accessory Bag with the Operator’s Manual and Remote Thermostat / CO Detector into the
accessory bag compartment. (See Figure 1-1).
Ensure the fuel cap is securely tightened.
3.2 Storage
3.2.1 Before storing
Always repack the accessory bag with the operators’ manual and remote thermostat / CO detector before storage. Place
the exhaust stack inside the fabric cover with straps and secure exhaust stack with straps. Reinstall all protective covers
and replace accessories bag into compartment in the base of the heater, see Figure 1-1. Drain the fuel from the tank
using the following steps:
1. Remove the four quick release pins.
2. Remove the top cover.
3. Carefully lift the heater up and remove the skid body.
4. Using a suitable container, remove drain plug and drain fuel. (You may need to lift the opposite end from drain
plug to ensure all fuel is drained).
5. Reinstall drain plug.
6. Lift the heater and place back into the skid body.
7. Reinstall top cover and four quick release pins.
3.2.2 After storing
1. Remove all fabric covers and Accessories Bag from heater.
2. Install exhaust stack.
3. Add fuel; run the heater outdoors in accordance to the start up procedures for 10 minutes.
4. Service heater if any problems are noted.
3.3 Shipping
Before shipping the D-1000B heater, ensure the power switch is in the OFF (O) position (the center position), the exhaust
stack is securely fastened inside the heat outlet fabric cover, the operators’ manual and remote thermostat / CO detector
are placed inside the Accessories Bag and placed in the base of the heater. Ensure all protective covers are in place.
This heater should be shipped in an enclosed box and securely fastened to a pallet.
STORAGE & TRANSPORT 3-1 DHS SYSTEMS LLC
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D-1000B Heater Operations & Maintenance
STORAGE & TRANSPORT 3-2 DHS SYSTEMS LLC
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THIS PAGE INTENTIONALLY LEFT BLANK

D-1000B Heater Operations & Maintenance
4. OPERATIONS
4.1 General
The following chapter contains general information for operating the D-1000B
heater.
4.2 Control Panel
Operation of the D-1000B heater requires the usage of the control panel shown in Figure 4.1
OPERATIONS 4-1 DHS SYSTEMS LLC
No rights are conveyed except as indicated in the legend on the inside front cover of this document.
1
3
2
5
4
100V-60Hz
II
I
Figure 4-1 - Control Panel Layout
1 – Reset Button - Press the reset button to reset the lock-out condition.
2 – Power Switch – Three positioned switch, controls power to the unit.
3 – Receptacle, Thermostat / CO Detector – Receptacle for thermostat usage, remotely.
4 – Power Cord – 120V 60Hz.
5 – Power Indicator Light – Will illuminate when power cord is plugged in.
4.3 Start Up Procedure for Normal Operations
1. Remove protective covers from each end and check for debris
2. Remove exhaust stack from heat outlet fabric cover.
3. Remove the operators’ manual and the thermostat / CO detector from the accessories bag.
4. Install exhaust stack.
5. Inspect fuel level and fill if necessary (use Diesel fuel or JP8).
6. Install the ducts and secure ducts by tightening strap. Minimize any bends. Keep ducts straight.
7. Connect heater to a 120V 60Hz grounded power supply; ensure the power indicator light (5) is illuminated.
8. If using, the remote thermostat / CO detector connect the cord’s plug into receptacle (3), set the temperature,
and place the power switch (2) in the ON (II) position.
9. If not using the remote thermostat / CO detector, place the power switch (2) in the ON (I) position.
CAUTION
Outdoor Use Onl
y
NOTE
When the heater is started for the first time or is started after the fuel tank has been
completely emptied, the flow of fuel to the burner may be impaired by air in the
system. In this case, the control box will cut out the heater and it will be necessary to
restart the starting procedures once or twice by depressing the reset button (1).
10. If the heater fails to start, press the reset button (1) to reset the lock-out condition.
11. If heater fails to start after three attempts, check the Troubleshooting section of the Operator’s manual.

D-1000B Heater Operations & Maintenance
4.4 Start Up Procedures for Cold Weather Operations
1. Connect heater to a 120V 60Hz grounded power supply for 15 minutes to pre-heat fuel filter.
2. Remove protective covers from each end and check for debris.
3. Remove exhaust stack from heat outlet fabric cover.
4. Remove the operators’ manual and the thermostat / CO detector from the accessories bag.
5. Install exhaust stack.
6. Install the ducts and secure ducts by tightening strap. Minimize any bends. Keep ducts straight
7. If using, the remote thermostat / CO detector connect the cord‘s plug into receptacle (3), set the temperature,
and place the power switch (2) in the ON (II) position.
8. If not using the remote thermostat / CO detector, place the power switch (2) in the ON (I) position.
9. If the heater fails to start, press the reset button (1) to reset the lock-out condition.
10. If heater fails to start after two attempts, check the Troubleshooting section of the Operator’s manual.
4.5 Start Up Procedures for High Altitude Operations (4500’/1500m)
1. Refer to Section 5.4.1 to gain internal access to the burner head.
2. Refer to Figure 5-9; remove rubber grommet (68) from burner flange (61).
3. Secure maintenance access panel and reinstall top cover.
4. Refer to Section 4.3 or 4.4 for start up procedures depending on conditions.
4.6 Shut Down Procedure
1. Place the power switch (2) to the OFF (O) position or if used set the thermostat to the lowest setting. By placing
the power switch in the OFF (O) position or setting the thermostat to the lowest setting, the flame will go out, but
the fan continues to spin for approximately 90 seconds cooling the combustion chamber.
CAUTION
Surfaces and pieces may be hot.
2. Remove the exhaust stack and heater duct. (Ensure items are cool before removing).
3. Repack the exhaust stack inside the heat outlet fabric cover.
4. Repack operator’s manual and remote thermostat / CO detector into the accessories bag.
5. Return the accessory bag to its compartment in the base of the heater.
6. Repack heater ducts into transport bag.
7. Replace fabric covers on each end of the heater.
OPERATIONS 4-2 DHS SYSTEMS LLC
No rights are conveyed except as indicated in the legend on the inside front cover of this document.

D-1000B Heater Operations & Maintenance
4.7 Filling the Fuel Tank
WARNING!
DO NOT USE GASOLINE. USING ANY UNAPPROVED FUELS FOR THE HEATER COULD
RESULT IN DAMAGE TO THE HEATER AND / OR PERSONAL INJURY.
Ensure the power switch is in the OFF (O) position. It is recommended to allow 5 minutes for the D-1000B heater to cool
before refueling.
1. Unplug the power cord from the power supply.
2. Unscrew the fuel cap and refuel the heater. (Use JP8, Diesel #1 or Diesel #2 fuel).
3. Reinstall the fuel cap. Clean any spills that may have occurred.
4. Reconnect the heater to the power supply; resume heater usage by placing the power switch to the ON (II)
position if using the remote thermostat or to the ON (I) position if not using the remote thermostat.
OPERATIONS 4-3 DHS SYSTEMS LLC
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D-1000B Heater Operations & Maintenance
OPERATIONS 4-4 DHS SYSTEMS LLC
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THIS PAGE INTENTIONALLY LEFT BLANK

D-1000B Heater Operations & Maintenance
MAINTENANCE, and REPAIR PROCEDURES 5-1 DHS SYSTEMS LLC
No rights are conveyed except as indicated in the legend on the inside front cover of this document.
5. MAINTENANCE, and REPAIR PROCEDURES
5.1 General
This chapter contains general information for operator-level, qualified personnel. A qualified person is one who is familiar
with this manual, the operation of the D-1000B heater; the hazard involved in its operation and maintenance, and has
been certified by the DHS Training Program. This chapter also describes the procedures for both periodic and daily
maintenance.
Periodic maintenance at the five-year interval is not covered in this manual; maintenance at this interval should be
performed by authorized DHS technicians. Maintenance and service contracts can be arranged with DHS Logistics Co.
Parts for maintenance and service can also be obtained from DHS Logistics Co. Please contact DHS for more
information (Phone: [phone], Fax: [phone] or E-mail: [email protected] ).
This manual is not intended to be a substitute for proper training. We strongly recommend that operators receive training
directly from DHS.
The cautions and warnings point out known conditions that are potentially hazardous. Note that no manual can cover
every possible situation. If in doubt, contact DHS.
Before calling DHS for assistance, please identify the heater by its DRASH serial number. The serial number is located
on the control panel side of the heater as shown in Figure 1-1.
Only authorized DHS technicians should perform Service and repairs beyond the scope of this manual.
5.2 Maintenance
This section describes preventive and regular maintenance schedules. Preventive and regular maintenance will ensure a
long trouble free life to your heater.
5.2.1 Periodic Maintenance
Periodic maintenance of the heater is necessary and must be part of the daily routine of operating the heater.
Maintenance activities should be performed at the following periodic intervals:
5.2.2 Daily Maintenance
Check the following points prior to starting the heater:
Ensure that both fabric covers have been removed.
Inspect both ends and the exhaust stack port for any debris. Remove debris.
Install heater ducts, secure by tightening strap. Minimize any bends. Keep ducts straight.
Verify fuel tank is full.
Verify that the exhaust stack is properly installed.
5.2.3 50 Hour Maintenance
After every 50 hours of operation, perform the following maintenance.
Remove, disassemble and inspect the pre-heated fuel filter.
Clean the fuel filter with clean fuel.
Remove top cover and clean the heaters’ exterior.
Loosen and slide the maintenance access panel rearward.
Using compressed air, clean the interior area.
Clean the fan blade.
Check for leaks.
Check for proper attachment of High Temp (H.T.) connectors to electrodes.
Remove burner assembly, clean and check electrode setting; adjust according to Step 5.4.9

D-1000B Heater Operations & Maintenance
5.2.4 Annual Maintenance
Check all nuts, bolts, fittings, and connections for looseness. Tighten as required.
Clean or replace the fuel filter.
Drain and flush the fuel tank.
Remove burner assembly, clean, and adjust electrode setting.
Remove and replace fuel nozzle.
5.3 Servicing the Fuel Tank
During regular scheduled maintenance or when the fuel tank becomes contaminated or dirty, the fuel tank can be cleaned
by removing the drain plug and draining the fuel. Using approximately four gallons (15 liters) of clean Diesel or JP8 fuel,
the fuel tank can be flushed.
If a leak is detected, the fuel tank is a non-repairable item, it must be replaced. For information on how to replace the fuel
tank, please contact DHS.
5.4 Repairs Procedures
5.4.1 General Access
To gain internal access to the motor assembly, combustion chambers, and the burner head, remove the four pins that
secure the top cover to the skid body as shown in Figure 5-1. Remove top cover. Loosen and slide the maintenance
access panel rearward.
Top Cover
Maintenance
Access Panel
Skid Bod
y
Quick Release
Pins
Figure 5-1 – General Access to Heater
MAINTENANCE, and REPAIR PROCEDURES 5-2 DHS SYSTEMS LLC
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D-1000B Heater Operations & Maintenance
NOTE!
In the following Repair Procedures, the numbers in parentheses refer to item
numbers listed in Chapter 8, Illustrated Parts Breakdown diagram on page 8-1 or
otherwise noted.
5.4.2 Removal and Installation Electric Motor Assembly
5.4.2.1 Removal procedures:
1. Disconnect power cord and allow heater to cool.
2. Remove the four quick release pins as shown in Figure 5-1; remove top exterior cover.
3. Using an 8mm nut driver, remove the upper heat shield (5) by removing six screws (79) and two sheet metal
screws (78). Remove heat shield and set aside.
4. Using a 4mm Allen wrench, loosen set screw (92) and remove fan blade (15).
5. Disconnect the three wires from the fuel solenoid (71).
6. Using a 15mm open end wrench, loosen and disconnect at the fuel pump, the fuel supply line (18) to the fuel filter
and fuel return line (22B) to the fuel tank.
7. Using a 13mm open end wrench, loosen and disconnect the fuel feed hose (65) at the fuel pump to the burner
head (61).
8. Using a 2.5mm Allen wrench, loosen (DO NOT REMOVE) three set screws on the fuel pump collar to the back of
the electric motor; remove fuel pump (70) from electric motor (10).
9. Using a Phillips screwdriver, loosen and remove two control panel mounting screws (81); pull out the control
panel assembly (29) from the base (30) to expose the terminal boards.
10. Disconnect and remove three wires; black wire (#9), tan wire (#10) from the terminal board (47), the yellow and
green stripe ground wire from the small terminal board (46) as shown in Figure 5-2.
Figure 5-2 – Control Panel Terminal Board
11. Slide the plastic cover off the capacitor (11) and disconnect two female terminal couplers. (See Figure 5-3).
12. Using a 13mm socket wrench, loosen and remove the mount nut and lock washer; remove capacitor (11).
13. Using an 8mm nut driver, loosen and remove four screws (78) securing the motor assembly plate (12).
14. Remove the electric motor (10) from the lower heat shield assembly (6).
15. Turn the electric motor (10) and plate assembly (12) upside down.
16. Using a 8mm nut driver, loosen and remove four electric motor mounting screws (79) and four spring washers
(80); remove unserviceable electric motor.
MAINTENANCE, and REPAIR PROCEDURES 5-3 DHS SYSTEMS LLC
No rights are conveyed except as indicated in the legend on the inside front cover of this document.

D-1000B Heater Operations & Maintenance
Figure 5-3 - Capacitor Wire Connections
5.4.2.2 Installation procedures:
1. Place serviceable electric motor (10) onto the motor assembly plate (12) and reinstall four mounting screws (79)
and four spring washers (80). Using a 8mm nut driver tighten hardware.
2. Install motor assembly plate (12) into lower heat shield (6).
3. Using an 8mm nut driver reinstall four screws (78) and tighten.
4. Using a 13mm socket wrench, reinstall capacitor (11) to the electric motor (10) install and tighten the lock washer
and nut.
5. Reconnect two female terminal couplers from the electric motor (10) to the capacitor (11) and reinstall the plastic
cover as shown in Figure 5-3.
6. Position fuel pump (70) behind electric motor (10) aligning tabs on the plastic coupler to the slots inside the
electric motor as shown in Figure 5-6 and Figure 5-7. Push in until fuel pump (70) is seated against the electric
motor (10).
7. Using a 2.5mm Allen wrench, tighten the three set screws on the fuel pump collar to the electric motor (10).
8. Using a 13mm open end wrench, connect and tighten the fuel feed hose (65) from the burner head (61) to fuel
pump (70).
9. Using a 15mm open end wrench, at the fuel pump, connect and tighten the fuel supply line (18) from the fuel filter
and fuel return line (22B) to the fuel tank at the fuel pump (70).
10. Install fan blade (15) and ensure it is flush with the forward end of the shaft.
IMPORTANT!
Fan blade must be positioned correctly on the electric motor shaft to ensure correct balance
of the fan.
11. Using a 4mm Allen wrench, tighten set screw (92) to secure the fan blade (15) in place.
12. Feed the electric motor wires through to the control panel.
MAINTENANCE, and REPAIR PROCEDURES 5-4 DHS SYSTEMS LLC
No rights are conveyed except as indicated in the legend on the inside front cover of this document.