GSI Group 2000 Series User manual

1
Series 2000 Downwind Heater
Downwind Series 2000
Centrifugal Heater
Installation And
Operating Instructions
Owner's
Manual
PNEG-591
MODEL # CH__ - __ __ - __ __ - 2 __ (HIGH)
MODEL # CL__ - __ __ - __ __ - 2 __ (LOW)

2
Series 2000 Downwind Heater

3
Series 2000 Downwind Heater TABLE OF CONTENTS
Safety ..........................................................................................................................4
Series2000HeaterInstallation.........................................................................................6
High Temperature Heater Specifications................................................................6
Low Temperature Heater Specifications................................................................6
AirPressureSwitchandTemperatureSensorBox......................................................7
TransitionHi-Limit Installation................................................................................7
Bin Configuration/Operating Temperature Table...................................................8
Heater Unit Wiring..................................................................................................9
Secondary Heater Unit Wiring................................................................................9
Machine To Earth Ground.....................................................................................10
Proper Installation Of The Ground Rod.................................................................10
Previously Installed Units......................................................................................10
Fuel Connection For Liquid Propane Models.........................................................11
Fuel Connection For Propane Vapor Models........................................................11
Fuel Connection For Natural Gas Models............................................................11
Installing Optional Humidity Sensor....................................................................12
Series2000OperatingProcedure....................................................................................13
Power Up..............................................................................................................13
Normal Operating Displays With Heater Not Running..........................................14
Starting The Dryer.................................................................................................15
Setting Gas Pressure ............................................................................................15
BTU's Per Gauge Pressure (PSI) 10-15 hp Models (Approximate)......................17
BTU's Per Gauge Pressure (PSI) 20-40 hp Models (Approximate).....................18
BTU's Per Gauge Pressure (PSI) Lo-temp Models (Approximate).....................20
Adjusting the Air Pressure Switch.......................................................................21
Adjusting The Vaporizor........................................................................................22
Running The Dryer...............................................................................................22
Programming Set Points.......................................................................................23
Programming Hours To Shutdown.......................................................................24
Drying Grain In The Hours To Shutdown Mode...................................................24
Run Hours Display...............................................................................................24
Multiple Heater Notes............................................................................................24
Modulating Valve Operation.................................................................................25
Factory Configuration..................................................................................................26
ConfigurationDipSwitches(NormallyDone At GSI)............................................26
Error Conditions..........................................................................................................27
Limit Switches......................................................................................................27
MultipleHeater Error Conditions...........................................................................27
Misc Error Numbers..............................................................................................27
Series 2000 Heater Service..........................................................................................28
Series2000 Wiring Diagram.........................................................................................29
Series 2000 Heater Parts............................................................................................30
10-15hpDWHighTemp Heater...............................................................................30
10-15hpDWLowTemp Heater................................................................................31
20-30hpDWHighTempHeater................................................................................32
20-30hp DW Low Temp Heater...........................................................................33
40hp DW High Temp Heater...............................................................................34
40hp DW Low Temp Heater................................................................................35
DW Heater Control Box......................................................................................36
Air Switch Temperature Sensor Box.....................................................................37
DW Propane Vapor Pipetrain..............................................................................38
DW Natural Gas Pipetrain...................................................................................39
DW Propane Vapor Hi-Lo Pipetrain....................................................................40
DW Natural Gas Hi-Lo Pipetrain........................................................................41
DW LP Pipetrain.................................................................................................42
Warranty.......................................................................................................................44

4
Series 2000 Downwind Heater
SAFETY
SAFETY FIRST
General Safety Statements
The GSI Group Inc’s Principal concern is
yoursafetyandthesafety of others associated with
grain handling equipment. We want to keep you
as a customer. This manual is to help you under-
stand safe operating procedures and some prob-
lems which may be encountered by the operator
and other personnel.
Asownerand/oroperator, itisyourrespon-
sibility to know what requirements, hazards and
precautions exist and inform all personnel associ-
ated with, or in the area of the product. Safety
precautions may be required from the personnel.
This product is ideal for the conditioning of corn,
soy beans or other select grains. Avoid any alter-
ation to the equipment, such alterations may pro-
duce a very dangerous situation, where serious in-
jury or death may occur. If a decal is damaged or missing contact:
The GSI Group Inc.
1004 E. Illinois St.
Assumption, IL 62510
217-226-4421
A free replacement will be sent to you.
DANGER indicates an imminentlyhazardoussituation
which, if not avoided, will result in death or serious in-
jury
WARNING indicates a potentially hazardous situation
which , if not avoided, could result in death or serious
injury.
CAUTION indicates a potentially hazardous situation
which, if not avoided, may result in minor or moderate
injury.
CAUTION used without the safety alert symbol indi-
cates a potentially hazardous situation which, if not
avoided, may result in property damage.
BE ALERT!
Danger!
Personnel operating or
working around electrical
equipment should read this
manual. This manual must be delivered with
equipment to its owner. Failure to read this
manual and its safety instructions is a misuse
of the equipment.
CAUTION
CAUTION
WARNING
DANGER
This is the safety alert symbol.
It is used to alert you to poten-
tial personal injury hazards.
Obey all safety messages that
follow this symbol to avoid possible in-
jury or death.
The GSI Group Inc. recommends that you
contact your local power company and have a rep-
resentative review your installation so your wir-
ing will be compatible with their system and so
thatyouwillhaveadequatepowersuppliedtoyour
unit.

5
Series 2000 Downwind Heater SAFETY
Roof Damage Warning And Disclaimer
GSI DOES NOT WARRANT ANY ROOF DAMAGE
CAUSEDBYEXCESSIVEVACUUMORINTERNALPRES-
SURE FROM FANS OR OTHER AIR MOVING SYSTEMS.
ADEQUATE VENTILATION AND/OR "MAKEUP AIR" DE-
VICES SHOULD BE PROVIDED FOR ALL POWERED AIR
HANDLING SYSTEMS. GSI DOES NOT RECOMMEND
THE USE OF DOWNWARD FLOW SYSTEMS (SUCTION).
SEVERE ROOF DAMAGE CAN RESULT FROM ANY
BLOCKAGE OF AIR PASSAGES. RUNNING FANS DUR-
ING HIGH HUMIDITY/COLD WEATHER CONDITIONS
CAN CAUSE AIR EXHAUST OR INTAKE PORTS

6
Series 2000 Downwind Heater
SPECIFICATIONS
Heater Size
Inside Height
Inside Width
Inside length
10-15
30.1/4"
19.1/2"
24"
20-30
33.1/4"
21.3/4"
24"
40
33.1/4"
23.11/16"
24"
Heater Dimensional Specifications
Hi-Temp Hi-Temp Lo-Temp Model
10-15HP 20-40HP All units
All Models BTU Rating 2225000 4500000 500000
Weight 145 145 135
Liquid Models Maximum Fuel flow (GPH) 24 49 N/A
Orifice size 0.2188 0.3125 N/A
Mod Valve Bypass Orifice Blue Aluminum Yellow
Minimum operating pressure 1 1 N/A
Maximum operating pressure 15 15 N/A
Minimum line size 3/8" 3/8" N/A
Vapor Models Maximum Fuel flow(CFH) 931 1898 210
Orifice size 0.2188 0.3125 0.109
Mod Valve Bypass Orifice Blue Aluminum Yellow
Minimum operating pressure 1 1 1
Maximum operating pressure 15 15 15
Minimum line size 3/8" 3/8" 1/2"
Natural Gas Maximum Fuel flow(CFH) 2496 4643 500
Models Orifice size 0.3438 0.4688 0.156
Mod Valve Bypass Orifice Aluminum Aluminum Green
Minimum operating pressure 0.5 0.5 1
Maximum operating pressure 7 7 7
Minimum line size 1.1/4" 1.1/4" 1"
CentrifugalHeaterSpecifications

7
Series 2000 Downwind Heater HEATER INSTALLATION
Air Pressure Switch and
Temperature Sensor Box
Installation
1. Using air switch box as a
guide, mark 2 holes on ple-
num side wall appproximately
24" to right of transition cen-
tered up and down in plenum.
2. Drill air switch filter hole 5/8"
diameter for snug fit. Drill tem-
perature sensor hole 5/8" or
largerto accommodate mounting
nut.
3. Mount Box to Bin using (4)
self drilling screws
4. Caulk between housing and side-
wall to seal.
Air Switch Box Assembly
1. Mark location on transition
one (1) foot up from the bot-
tom (entrancecollar) and cen-
tered in the transition.
2. Drill or knock out 7/8" diam-
eter hole on marked location.
3. Install transitionhi-limit using
supplied self drilling screws.
Transition Hi-limit Installation
Figure 1: The transition connecting the Series 2000 Heater to the bin with
the sensor in place.

8
Series 2000 Downwind Heater
Bin Configuration
IMPORTANT! When
mounting (2) heaters on a
bin it is imperative that
they be situated as
illustrated in this draw-
ing. Plenum thermostat
must be to the right of
master heater and master
heater must be to the
right of slave heater.
IMPORTANT!
DO NOT EXCEED
PLENUM
TEMPERATURES
LISTED IN TABLE
THIS TABLE IS NOT INTENDED AS A DRYING GUIDE.
IT SHOULD BE USED AS A REFERENCE FOR SETTING MAXIMUM PLENUM
TEMPERATURE FOR SAFE OPERATION.
PMET-OL HCTAB
-HGIH PMET YRDHCTAB GNIRRITSON -HGIH PMET HTIW GNIRRITS
SUOUNITNOC WOLF
)GNITALUCRICER(
NROC
02-5
0
EVOBA TNEIBMA PMET 021
0
041
0
061
0
ECIR
01-5
0
EVOBA TNEIBMA PMET 001
0
001
0
TON DEDNEMMOCER
SNAEB &TAEHW
02-5
0
EVOBA TNEIBMA PMET 011
0
021
0
TON DEDNEMMOCER
Operating Temperature Table
HEATER INSTALLATION

9
Series 2000 Downwind Heater HEATER INSTALLATION
1. Be sure fan unit is installed and
wired to meet local codes. Be
sure equipment is well grounded
(see page 10).
2. A separate neutral is required
for 120 volt heater circuit in 220
volt 1PH and 3PH fan units. For
460 volt fan units a separate 120
volt power supply or transformer
is required.
3. Run 5-wire black cord from
heater unit to fan unit and se-
cure to fan.
4. Orange and red wires should be
connected in series with coil in
fan. When contacts in heater be-
tween these wires open fan
Wiring
Heater Unit
4. Third heater unit may also be added to system.
If adding third unit, run connections to master
unit #1 and connect them in parallel with sec
ondary heater unit.
2. Run (2) 20 gauge (minimum) wires from sec-
ondary heater unit (slave) to heater unit #1
1. Secondary heater unit runs as a slave of heater
unit #1 and requires no plenum temperature
sensor.
Figure 3: Secondary heater wiring diagram.
Figure 2: Wiring diagram for the fan and heater unit.
SECONDARY HEATER UNIT
shuts down. Recommended wiring is shown in Figure 2.
5. Black and white wires should be connected to a fused 120V
power supply as shown. Green wire should be connected to
ground in fan. Heater should have power, even with fan off.
(master).
3. Connect wires as shown in Figure 3.

10
Series 2000 Downwind Heater
HEATER INSTALLATION
It is very important that a machine
to earth ground rod be installed at
the fan. This is true even if there is
a ground at the pole 15 feet away.
This ground needs to be as close to
the fan as possible, but no more than
8 feet away. The ground rod should
beconnected to the fan controlpanel
with at least a #6 solid bare copper
ground wire, or in accordance with
local requirements. The machine to
earth ground provides additional
safety if there is a short. It also pro-
vides the grounding necessary for
long life and operation of the solid
state circuit boards used on control
circuits and the electronic ignition
systems.
Machine To Earth
Ground
Dig a hole large enough to hold 1
or 2 gallons of water. Work the
ground rod into the earth until it is
completely in the ground.
It is recommended that previously installed units be checked to see
that a machine to earth ground has been installed by an electrician.
(Groundrodsand wires arenotsupplied by Airstream).Itisrecommended that
therodnotbedrivenintodryground.Thefollowingstepsensureproperground
rod installation:
1. Dig a hole large enough to hold 1 to 2 gallons of water.
2. Fill hole with water.
3. Insert rod through water and jab it into the ground.
4. Continue jabbing the rod up and down, the water will work its way
down the hole, making it possible to work the rod completely
into the ground. This method of installing the rod gives a good
Previously Installed Units
Proper Installation Of The Ground Rod
conductive bond with the surrounding soil.
5. Connect the bare copper ground wire to the rod with the proper
ground rod clamp.
6. Connect the bare ground wire to the fan control boxes with a
grounding lug. See figure 4.
7. Ground wire must not have any breaks or splices. Insulated
wire is not recommended for grounding.
Figure 4: Use a
#6 or approved
size bare copper
ground wire.
Install a 5/8"
diameter 8' long
copper-clad
ground rod, 2'
away from the
foundation and 1'
below the surface
of the ground or
in accordance
with local
requirements.

11
Series 2000 Downwind Heater HEATER INSTALLATION
Standard electrical safety prac-
tices and codes should be used
when working with a heater.
Refer to the National Electric
Code Standard Handbook by
the National Fire Protection
Association. A qualified elec-
trician should make all wiring
installations.
IMPORTANT! Do not use pro-
pane tanks that have previ-
ously been used for ammonia
unless they have been purged
according to procedures of the
National L.P. Association.
Fuel supply system must
comply with local codes for L.P.
gas installation.
1. Propane vapor models are designed to run di-
rectly off of a supply tank or from a separate
3. After installation is complete check all connec-
tions for leaks. DO NOT USE FLAME FOR
LEAK TESTING.
Liquid Propane Models
Natural Gas Models
Propane Vapor Models
ALWAYS DISCONNECT
AND LOCK OUT
POWER
BEFORE WORKING ON
OR AROUND HEATER
1. Natural gas models are designed to run directly
off of a supply tank or from a separate
external vaporizer.
2. Run proper size line (see specification on page 7)
to pipetrain on heater. Have a qualified gas
service person inspect installation to be sure ev-
erything is installed according to local codes
and ordinances.
3. After installation is complete check all connec-
tions for leaks. DO NOT USE FLAME FOR
LEAK TESTING.
3. After installation is complete check all connec-
tions for leaks with liquid detergent or compa-
rable. Wear rubber gloves and eye protection.
Avoid contact with liquid propane. DO NOT
USE FLAME FOR LEAK TESTING.
1. L.P. models are designed to run on liquid pro
pane with liquid draw from the propane tank.
Avoid using propane supply tanks that have been
used for vapor draw for long periods of time.
When using liquid draw systems any moisture
that may be present in tank or lines may freeze
when system is used in cold weather. To avoid
this situation, purge the system with methanol.
2. Run proper size line (see specification on page
7) to liquid pipetrain on heater. Have a qualified
gas service person inspect installation to be sure
that everything is installed according to local
codes and ordinances.
Fuel Connection
external vaporizer.
2. Run proper size line (see specifications on page
7) to pipetrain on heater. Have a qualified gas
service person inspect installation to be sure that
everything is installed according to local codes
and ordinances.

12
Series 2000 Downwind Heater
HEATER INSTALLATION
Installing Optional Humidity Sensor
1. Humidity sensor should be mounted 6-8"
right of the airswitch/temperature sensor
box. See Figure A.
2. Using sensor as a guide drill or knock-out
7/8" diameter hole in the center of the
plenum on the bin sidewall. If you are
using sensor to sense drying air humidity.
3. Insert pipe nipple from sensor housing
throughhole in side wall and use self-
drilling screws to mount to sidewall.
Figure B
4. Do not caulk sensor box openings on side
of box, they are for air escape.
Figure A
Figure B

13
Series 2000 Downwind Heater
ALWAYS DISCONNECT
AND LOCK OUT POWER
BEFORE WORKING ON
OR AROUND HEATER
OPERATING PROCEDURE
The control panel display showing initial start up.
All safety and high limit switches are checked upon
power up. If a safety or limit is open, the control dis-
playsit. Thecontrolcannotoperatewitha safety switch
error, and the fan cannot turn on with an error condi-
Standard electrical safety practices and codes should
be used when working with a heater. Refer to the
National Electric Code Standard Handbook by
the National Fire Protection Association. A quali-
fied electrician should make all wiring installa-
tions.
Power Up
The controller locks up with the main display alter-
nating between a "FAN" and "ON" message. This
may be bypassed by depressing and holding the
"FAN BYPASS" switch (lower right switch). Nor-
mal operating procedure should be to power up the
controller with the fan off.
If multiple heaters are tied together, and the
master detects that the slave fan is on (the air
switch stuck?), the master will lock up display-
ing "SLA ERROR". This condition may be by-
passed with the "FAN BYPASS" switch.
tion. There is no way to bypass an error condition. It
must be fixed. (See errors on page 21)
The air switch is also checked on power up.
The air switch must indicate no airflow. This is
necessary to check the function of the air switch.
However, if the operator forgets and turns the fan
on before the controller has been powered up,

14
Series 2000 Downwind Heater
OPERATING PROCEDURE
Normal Operating Displays With Heater Not Running
The heater display with fan on (airflow).
When drying is not occurring, and the limit
or error condition is corrected, the display returns
to its normal output. This is not the case with an
error or limit condition during the drying opera-
tion. This causes the display to lock up in the er-
ror display mode. This is to keep the display
locked up with the condition illuminated. ( see
section on "Running the Dryer" for mode expla-
nation on page 17).
The main display shows the plenum temperature. If
the dryer has not been running, the display should
show outside temperature. The control is preset at
the factory to display temperature in centigrade or
fahrenheit.
"AIRFLOW" or "NO AIRFLOW" is displayed
if air is flowing or not flowing. "RX TX" (receive,
transmit) is displayed if multiple heaters are con-
nected.
All safeties or high limits are continuously
checked during the off mode. A limit switch open,
or any other error condition will cause the display
to show the limit or error condition.

15
Series 2000 Downwind Heater OPERATING PROCEDURE
1. At heater turn toggle switch to "ON" position.
2. Press the "PROGRAM TEMPERATURE" but-
ton.
3. Use the increase or decrease button to set the
"PLENUM HIGH LIMIT SET POINT" to de-
sired setting (100°-160°*).
4. Press the "PROGRAM TEMPERATURE" but-
ton to continue to set the "CYCLE SETPOINT".
(hi-lo units only)
5. Use the increase or decrease buttons to set the
"CYCLE SET POINT" to desired setting (90°-
150°*) (hi-lo units only).
6. Press "programstemperature" buttonto continue
to set the desired "relative humidity" setting,
lower setting will run heater longer. (humidity
sensor units only) Use arrow keys to set.
7. Press the "PROGRAM TEMPERATURE" but
ton to continue to set the "TEMPERATURE
DIFFERENTIAL".
8. Use the increase or decrease buttons to set the
"TEMPERATURE DIFFERENTIAL" to 10°*.
9. Press "progam temperature" button to continue
to set "relative humidity differential". Use ar-
row keys to adjust to 5%. ( Hudidity sensor units
only).
10. Open all manual gas shut off valves, on and to
the heater unit.
11 Start the fan unit.
12. Make sure that the blade is spinning in the right
direction. If not place the toggle switch in the
"OFF" position and correct the problem.
13. After the fan reaches full speed the display should
read "AIRFLOW" in the upper right hand corner.
If not adjust air switch. (See page 19)
14. Press the start button on the heater control.
15. After 10 seconds the burner should ignite. If not,
turn"OFF"the toggle switch andthenback"ON".
Repeat 12-15.
Programming the temperature differential.
Setting Gas Pressure
Starting The Dryer
*Temperatures are fahrenheit.
After heater power is turned on, the fan must be
turned on. Attempting to start the dryer without the
air switch indicating there is airflow will cause an air-
flowalarmtogo offwhenthe start switch isdepressed.
The airflow alarm is simply the entire display going
blank, and the "NO AIRFLOW" message flashing for
a few seconds. The display must show "AIRFLOW"
before the dryer can be started.
To start the dryer, just push the "START" switch.
The first message to come up will be the "PURGE"
message--the drying process begins with a 10 sec-
ond purge.
When multiple heaters are connected together,
drying may be started from any heater control.

16
Series 2000 Downwind Heater
17. Pressthe"PROGRAMTEMPERATURE"but-
ton to change the high limit set point. Press it
againtochangethe"CYCLESETPOINT". (hi-
lo units only)
18. Decrease the "CYCLE SET POINT TEM
PERATURE" until the heater cycles to low
flame. (hi-lo units only)
16. When the burner ignites the display should read
"HI-FLAME " at the left of the display. Loosen
the nut on the main regulator and turn screw in, to
increase pressure and out to decrease pressure.
The pressure gauges should be set at 10-15 lbs.
for LP units, or 4-6 lbs.. for natural gas units. (use
the charts on the following pages to set pressure)
19. Open or close the low cycle ball valve until
the gas pressure is 3-5 lbs. for LP, or 1-2 lbs.
for natural gas. (hi-lo units only)
20. Increase the cycle set point toreturn to high
flame. (hi-lo units only)
21. Watch heater run several minutes to make
sure it cycles between hi and lo flame or on
andoff properly.
22. Hi-flame pressure should be adjusted so ple-
num reaches cycling temperature easily.
23. Adjust pressure on on/off units so that unit is
on approximately 75% of the time.
OPERATING PROCEDURE

17
Series 2000 Downwind Heater OPERATING PROCEDURE
2 4 6 8 10 12 14 15
ALL
MODELS 816,013 1,148,640 1,409,477 1,632,026 1,825,859 1,995,762 2,153,700 2,227,883
Fan Static
Model Pressure 60 80 100 120 140 160 180
2"24681013
10hp4"135681114
6"11356810
2" 3 6 9 12 15
15 hp 4" 3 5 7 10 13
6"235691114
Gau
g
e Pressure (psi) Required to Maintain Temperature (Approximate)
(10-15 hp High Temperature Propane Units Only)
Heat Rise
(
°F
)
10-15 hp Units
BTUs Per Gau
g
e Pressure
(p
si
)
PROPANE MODELS
(
A
pp
roximate
)
OPERATING PRESSURE (psi)
Hi
g
h Temperature 10-15hp 7/32" (0.219") Orifice
1234567
ALL
MODELS 859,104 1,218,432 1,489,296 1,718,208 1,921,584 2,107,632 2,276,352
Fan Static
Model Pressure 60 80 100 120 140 160 180
2" 1 1.75 2.5 3.5 4.75 6
10 hp 4" 0.75 1.25 2 2.75 3.75 4.75 6
6" 0.5 1 1.5 2 2.75 3.5 4.25
2" 1.5 2.5 3.75 5.5
15 hp 4" 1.25 2 3 4.25 5.75
6" 0.75 1.25 2 2.75 3.75 5 6
OPERATING PRESSURE (psi)
Gau
g
e Pressure (psi) Required to Maintain Temperature (Approximate)
(10-15 hp High Temperature Natural Gas Units Only)
Heat Rise
(
°F
)
10-15 hp Units
BTUs Per Gau
g
e Pressure
(p
si
)
NATURAL GAS MODELS
(
A
pp
roximate
)
Hi
g
h Temperature 10-15hp 11/32" (0.344") Orifice

18
Series 2000 Downwind Heater
OPERATING PROCEDURE
2 4 6 8 10 12 14 15
ALL
MODELS 1,663,135 2,345,140 2,878,779 3,328,663 3,721,115 4,068,100 4,393,548 4,541,914
Fan Static
Model Pressure 60 80 100 120 140 160 180
2"22457810
20 hp 4" 1 2 3 4 5 7 8
6"1234567
2" 2 3 5 7 9 12 15
25 hp 4" 2 3 4 6 8 10 13
6"22456810
2"24681115
30 hp 4" 2 4 5 7 10 13
6" 2 3 4 6 8 10 13
2" 3 6 8 12
40 hp 4" 3 5 7 11 14
6"347912
Gau
g
e Pressure (psi) Required to Maintain Temperature (Approximate)
(20-40 hp High Temperature Propane Units Only)
Heat Rise
(
°F
)
20-40 hp Units
BTUs Per Gau
g
e Pressure
(p
si
)
PROPANE MODELS
(
A
pp
roximate
)
OPERATING PRESSURE (psi)
Hi
g
h Temperature 20-40hp 5/16" (0.313") Orifice

19
Series 2000 Downwind Heater
1234567
ALL
MODELS 1,597,824 2,266,320 2,770,656 3,195,648 3,573,216 3,919,776 4,234,416
Fan Static
Model Pressure 60 80 100 120 140 160 180
2" 0.75 1.25 1.75 2.5 3.25 4.25 5.5
20 hp 4" 0.5 1 1.5 2 2.75 3.5 4.5
6" 0.5 0.75 1.25 1.75 2.25 3 3.75
2" 1 1.75 2.25 3.5 4.75 6.25
25 hp 4" 0.75 1.5 2.25 3.25 4 5.25 6.25
6" 0.5 1.25 1.75 2.5 3.25 4.25 5.5
2" 1.25 2 3 4.5 6
30 hp 4" 1 1.75 2.75 3.75 5 7
6" 0.75 1.5 2.25 3 4 5.25 7
2" 1.75 3 4.5 6.25
40 hp 4" 1.5 2.5 4 5.5
6" 1.25 2.25 3.5 4.75 6.75
OPERATING PRESSURE (psi)
Gau
g
e Pressure (psi) Required to Maintain Temperature (Approximate)
(20-40 hp High Temperature Natural Gas Units Only)
Heat Rise
(
°F
)
20-40 hp Units
BTUs Per Gau
g
e Pressure
(p
si
)
NATURAL GAS MODELS
(
A
pp
roximate
)
Hi
g
h Temperature 20-40hp 15/32" (0.469") Orifice
OPERATING PROCEDURE

20
Series 2000 Downwind Heater
OPERATING PROCEDURE
2 4 6 8 10 12 14 15
ALL
MODELS 203,405 287,160 351,771 409,203 457,063 497,744 538,425 555,176
Lo-Temp Units
BTUs Per Gau
g
e Pressure
(p
si
)
PROPANE MODELS
(
A
pp
roximate
)
OPERATING PRESSURE (psi)
Low Temperature All hp 7/64"
(
0.109"
)
Orifice
1234567
ALL
MODELS 177,840 251,712 308,256 355,680 397,632 435,936 470,592
OPERATING PRESSURE (psi)
BTUs Per Gau
g
e Pressure
(p
si
)
NATURAL GAS MODELS
(
A
pp
roximate
)
Low Temperature All hp 5/32"
(
0.156"
)
Orifice
Lo-Temp Units