Brock GUARDIAN Series User manual

GUARDIAN® Series
CDH Downstream Heater
Installation and Specifications/Owner-Operator’s Manual
MFH1800COctober 2007

Warranty BROCK® GUARDIAN® CDH Downstream Heater
2MFH1800C
Brock Grain Systems (“Brock”) warrants each new Brock Fan or Heater manufactured by it to be free from defects
in material or workmanship for two years from and after the date of initial installation by or for the original
purchaser. If such a defect is found by the Manufacturer to exist within the two year period, the Manufacturer
will, at its option, (a) repair or replace such product free of charge, F.O.B. the factory of manufacture, or (b) refund
to the original purchaser the original purchase price, in lieu of such repair of replacement. Labor costs associated
with the replacement or repair of the Fan or Heater are not covered by the Manufacturer.
Conditions and Limitations
(a) The product must be installed and operated in accordance with instructions published by the Manufacturer or
Warranty will be void.
(b) This product must be purchased from and installed by an authorized Brock Dealer or the Warranty will be void.
(c) Malfunctions or damage resulting from misuse, abuse, negligence, alteration, accident, or lack of proper
maintenance shall not be considered defects under this Warranty.
The Manufacturer shall not be liable for any consequential or special damage which any purchaser may suffer or
claim to suffer as a result of any defect in the product. “Consequential” or “special damages” as used herein
include, but are not limited to, lost or damaged products or goods, costs of transportation, lost sales, lost order,
lost income, increased overhead, labor and incidental costs and operational inefficiencies.
THIS WARRANTY CONSTITUTES THE MANUFACTURER’S ENTIRE AND SOLE WARRANTY AND
THE MANUFACTURER EXPRESSLY DISCLAIMS ANY AND ALL OTHER WARRANTIES,
INCLUDING, BUT NOT LIMITED TO, EXPRESS AND IMPLIED WARRANTIES AS TO
MERCHANTABILITY, FITNESS FOR PARTICULLAR PURPOSES SOLD AND DESCRIPTION OR
QUALITY OF THE PRODUCT FURNISHED HEREUNDER.
Brock Dealers are not authorized to modify or extend the terms and conditions of this Warranty in any manner or
to offer or grant any other warranties for BROCK® products in addition to those terms expressly stated above.
An officer of CTB, Inc., must authorize any exceptions to this Warranty in writing. The Manufacturer reserves
the right to change models and specifications at any time without notice or obligation to improve previous models.
Effective October 2007
BROCK GRAIN SYSTEMS
A Division of CTB Inc.
P.O. Box 2000 · Milford, Indiana 46542-2000 · U.S.A.
Phone [phone] · Fax [phone]
e-mail: [e-mail] · Internet: http//www.brockmfg.com
NOTE: The original, authoritative version of this Manual is the [English] version produced by CTB, Inc. or any of its subsidiaries or
divisions, (hereafter collectively referred to as "CTB"). Subsequent changes to any Manual made by any third party have not been re-
viewed nor authenticated by CTB. Such changes may include, but are not limited to, translation into languages other than [English], and
additions to or deletions from the original content. CTB disclaims responsibility for any and all damages, injuries, Warranty claims and/
or any other claims associated with such changes, inasmuch as such changes result in content that is different from the authoritative CTB-
published [English] version of the Manual. For current product installation and operation information, please contact the Customer Service
and/or Technical Service Departments of the appropriate CTB subsidiary or division. Should you observe any questionable content in any
Manual, please notify CTB immediately in writing to: CTB Legal Department, P.O. Box 2000, Milford, IN 46542-2000 USA.
Thank You
The employees of BROCK GRAIN SYSTEMS would like to thank you for your recent BROCK purchase. If a
problem should arise, your BROCK Dealer can supply the necessary information to help you.
Warranty

Contents
Topic Page
MFH1800C 3
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Remember! Think SAFETY First . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Support Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Distributor and Installer Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
SAFETY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Recognize SAFETY Information • Understand Signal Words. . . . . . . . . . . . . . . . . . . . 5
Follow SAFETY Instructions • SAFETY Decals . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-6
Operator Electrical SAFETY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Electrical Installation Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
SAFETY Near Hot Surfaces • SAFETY Near Combustible Fuels. . . . . . . . . . . . . . . . . 9
There are Suffocation Hazards in Flowing Grain!. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
About This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Definition of Terms and Pictures • Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Identification of Parts and Hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Plumbing Fittings Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Heater Parts Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-14
General Heater . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Pre-Installation Planning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Tools and Equipment Needed • Heater Inspection • Venting . . . . . . . . . . . . . . . . 15
Heater Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 6
Bin and Transition Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Foundation / Concrete Pad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Electrical Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Wiring SAFETY Reminders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Electrical Connection • Power Interlocking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Plenum Thermostat Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Heater Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Gas Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
General • Liquid Propane • Propane Vapor • Natural Gas. . . . . . . . . . . . . . . . . 23
Operation: Intitial Startup Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Initial Startup Check • Fan and Heater Pre-Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Heater Control Lockout Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Ignition Check • Plenum Temperature Controlling Thermostat Check. . . . . . . . . . . . . 25
Hi-Limit Thermostat Check • Fan and Heater Shut Down . . . . . . . . . . . . . . . . . . . . . 25
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Flame Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Controls • Fan and Heater Shut Down . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Fuel Specifications: Gas Pressure/Orifice Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29-30
Maintenance and Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
SAFETY Reminders • Yearly Startup Checks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Trouble Shooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32-33
Parts Lists . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34-45
Housing Assmebly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34-35
Plumbing Assemblies, 1'' and 3/4'' . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Intake Plumbing Assembly • Regulator Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Vaporizer Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Burner Assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39-40
Two-Rung . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Three-Rung . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Propane Vapor and Natural Gas CDH Downstream Heaters . . . . . . . . . . . . . . . . . . . . . 42-43
Liquid Propane CDH Downstream Heaters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44-45
Models and Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

General BROCK® GUARDIAN® CDH Downstream Heater
4MFH1800C
Remember! Think SAFETY First!
This symbol is used throughout this Manual to identify particular stages where the bin Contractor and/or Operator
need to take special note and precautions regarding the danger described in these Instructions. Please read all the
SAFETY information and the instructions completely prior to beginning the construction.
Support Information
Using this equipment for any other purpose or in a way not within the operating recommendations specified
in this Manual will void the Warranty and may cause injury or death. This Manual is designed to provide
comprehensive planning and construction information for this BROCK® product. The Table of Contents provides
a convenient overview of the information in this Manual.
Dealers: Please provide the Customer with the information to complete the easy reference below.
Dealer or Customer: Complete the following information about your BROCK® product. Store this Manual in a
safe, dry place for future reference.
Distributor and Installer Information
General
Please fill in the following information about your Product.
Keep this Manual in a clean, dry place for future reference.
Distributor’s Name___________________________________________________
Distributor’s Address ________________________________________________
Distributor’s Phone _______________________ Date of Purchase ___________
Installer’s Name _____________________________________________________
Installer’s Address___________________________________________________
Installer’s Phone _______________________ Date of Installation ___________
FAN System Specifications
Model:_______________________________________________________________
Serial Number:________________________________________________________
Fuel Type: _________________________ Control:__________ Volts:___________
Input Rate:________________ MAX MMbtu/hr:__________ MIN MMbtu/hr:_______
Burner Pressure: _____________________ MIN psi:________ Max psi:_______
Supply Pressure: ___________________ MIN psi:________ Max psi:_______

BROCK® GUARDIAN® CDH Downstream Heater SAFETY
MFH1800C 5
Recognize SAFETY Information
This is the Safety-Alert Symbol. When you see this symbol on your equipment or in
this Manual, be alert to the potential for personal injury.
Signal words DANGER, WARNING , or CAUTION , are used with the Safety-Alert Symbol.
Be sure to follow ALL National and Local Safety Standards governing each
installation site.
Understand Signal Words
DANGER indicates an imminently hazardous situation which, if not avoided, WILL
result in death or serious injury.
WARNING indicates a potentially hazardous situation which, if not avoided,
COULD result in death or serious injury.
CAUTION indicates a hazardous situation which, if not avoided, MAY result in
minor or moderate injury.
Follow SAFETY Instructions
BROCK® Heaters are built with your SAFETY in mind. However, accidents can
happen with improper installation or use of any ventilation system using moving
blades and high voltage. BROCK strives to take every reasonable precaution to
design equipment that is safe without compromising or restricting necessary
movement of Heater components.
Carefully read all these SAFETY procedures and follow them whenever you are
around or operating the Heater.
Also read and follow the SAFETY procedures in your Manuals to supplemental
equipment and accessories, and on your equipment SAFETY Decals.
Follow recommended precautions and safe operating practices of all applicable local,
state and national codes at each installation site.
Keep this Manual in a safe, dry place where the Heater Operator can easily obtain it.
Contact your BROCK Dealer to replace a Manual should it become lost or damaged.
CAUTION! For operation and use of your Heater, read and understand this Manual.
Failure to read this Manual by qualified personnel BEFORE Heater
assembly, installation or usage, constitutes a misuse of the equipment
and could void the Warranty.
CAUTION! Failure to follow proper operational procedures may cause damage to
equipment and may result in minor or moderate injury.
SAFETY Decals
SAFETY information has been provided by the Manufacturer to help insure the safe
and proper use of this product. This SAFETY information has been placed on
components throughout the Heater to provide proper access to the user.
IMPORTANT! Carefully read all SAFETY Decals on your Heater and in this Manual.
Follow recommended precautions and safe operating practices.
IMPORTANT! Check all equipment for DANGER, WARNING and CAUTION and other
Decals and their proper placement, before equipment is OPERATED.
Never use equipment if Decals are missing, improperly placed,
damaged or altered. If the SAFETY Decals are not properly placed or if
they are in any way damaged or altered, call the Manufacturer for
immediate replacement. Keep them clean, grease-free and in good
condition.
SAFETY

SAFETY BROCK® GUARDIAN® CDH Downstream Heater
6MFH1800C
.
SAFETY
Check all equipment for DANGER and WARNING Decals, and Fuel Labels and their proper
placement, before equipment is OPERATED. Never use equipment if Decals are missing,
improperly placed, damaged or altered. If the SAFETY Decals are not properly placed or if they
are in any way damaged or altered, call the
Manufacturer for immediate replacement. Keep
them clean and grease-free.
Figure 4 shows the proper
location of the SAFETY
Decals as shipped from
the factory. Replace
damaged or missing
Decals. Make sure the
Decals can be easily seen
at all times.
PROPANE VAPOR /
NATURAL GAS
Read operator's manual for
connection instructions and
burner operating pressures.
0-48695
WARNING
0-48693
-FLAME and HOT surfaces
inside cover may cause
serious injury.
-Do not operate with cover
removed.
-Disconnet power & allow
to cool before servicing.
Figure 1. AXH Heater SAFETY Decal Locations
DANGER Decal (0-48354)
Located on the Control Box Lid, upper right.
It should read exactly as Figure 2 on Page 7.
WARNING Decal (0-48693)
Located on the Housing near the front opening of the
Heater. It should read exactly as Figure 3 on Page 9.
LIQUID PROPANE
Read operator's manual for
connection instructions and
burner operating pressures.
0-48694
LIQUID PROPANE Decal (0-48694)
Located on the Heater Housing near
theVaporizer Assembly. It should read exactly
as Figure 4A on Page 8.
PROPANE VAPOR/NATURAL GAS Decal (0-48695)
Located on the Heater Housing near theVaporizer Assembly.
It should read exactly as Figure 4B on Page 8.

BROCK® GUARDIAN® CDH Downstream Heater SAFETY
MFH1800C 7
Operator Electrical SAFETY
DANGER! Electricity can KILL! Use extreme CAUTION around electrical
components. Failure to follow these instructions will result in death or
serious injury.
DANGER Decal 0-48354 in Figure 2 is located on the Control Box of the Heater as
also shown in Figure 1.
WARNING! DO NOT OPERATE the Heater with any components removed or
damaged. Failure to follow these instructions could result in death,
serious injury, or equipment damage.
Never remove, cut, modify or damage any component part of the Heater.
Keep hands, feet, hair, and clothing away from hot parts or parts in motion. Never wear
loose-fitting clothing or flowing scarves/jewelry around moving parts or equipment.
DANGER! Do not allow the Heater to run while any adjustments are being made.
Failure to shut it off will result in personal injury or death. Disconnect
electrical power BEFORE inspecting or servicing equipment unless
maintenance instructions specifically state otherwise. Failure to do so
will result in death or serious injury.
Before restarting a Heater that has been stopped because of an emergency, an
inspection of the Heater shall be made and the cause of the stoppage determined. The
starting device shall be locked or tagged out before any attempt is made to remove
the cause of the stoppage.
IMPORTANT! A LOCKOUT device must be installed at the time of the Heater
installation to prevent the machine from starting during a safety check,
maintenance, etc. Lockable disconnect switches should open control
enclosures containing hazardous voltage wiring.
All electrical equipment shall be grounded. Ground all non-current carrying metal
parts to guard against electrical shock.
WARNING! Under no circumstances should horseplay be permitted near the
Heater. Failure to follow these instructions could result in death or
serious injury.
CAUTION! Because of the danger of flying debris, protective eyewear/safety glasses
MUST be worn during assembly, installation, maintenance or servicing of
this Heater. Failure to do so may result in minor or moderate injury.
SAFETY
Figure 2. Electrical DANGER Decal 0-48354

SAFETY BROCK® GUARDIAN® CDH Downstream Heater
8MFH1800C
Electrical Installation Requirements
WARNING! Heater installations shall meet the National Fire Protection Association
Standard 61B for the prevention of fires and explosions in grain
elevators and facilities handling bulk raw agricultural commodities.
Failure to follow this standard could result in death or serious injury.
In selecting electrical control equipment to be used with any installation, the
purchaser must use equipment conforming to the National Electrical Code, the
National Electrical Safety Code and other applicable local or national codes.
IMPORTANT! All electrical wiring should be done by a qualified electrician and all
components must meet the National Fire Protection Association
Standard NFPA No. 70, American National Standard Inst. ANSI-C1, and
local requirements.
BROCK assumes no responsibility for the electrical wiring used with
this Heater. BROCK will not be liable for damage to the Heater because
of improper electrical installation or use.
IMPORTANT! All Safety devices, including wiring of electrical devices shall be
arranged to operate such that a power failure or failure of the device
itself will not result in a hazardous condition.
CAUTION! To prevent a hazardous condition, the Heater MUST be prevented from
restarting on its own after a power failure when power returns.
Heater controls should be so arranged that, in case of emergency stop, manual resets
or starts (at the location where the emergency stop initiated) shall be required for
the Heater(s) and associated equipment to resume operation.
SAFETY

BROCK® GUARDIAN® CDH Downstream Heater SAFETY
MFH1800C 9
SAFETY Near Hot Surfaces
WARNING! If the Heater has been in operation, avoid contact with the Heater
surface, flame and ignition components until these parts have had
sufficient time to cool. Failure to follow this WARNING could cause
serious injury. Disconnect the power and allow the Heater to COOL
BEFORE servicing.
CAUTION! Do not operate the Heater with the Housing removed or damaged. Do
not permit any close object or obstruction to affect or restrict the airflow
output at the Heater front. To do so could cause equipment damage or
personal injury.
The WARNING Decal 0-48693 in Figure 3 is located on the Housing hear the front
opening of the Heater as shown in Figure 1.
SAFETY Near Combustible Fuels
WARNING! Avoid allowing open flame or lit cigarettes near Heater fuels and the
tanks and pipes which supply them to the Heater. Failure to follow this
WARNING could cause combustion/fire, equipment damage, and/or
serious injury.
CAUTION! Do not operate the Heater if fittings, hoses or other plumbing
components have been damaged. To do so may cause combustion/fire
leading to equipment damage or personal injury.
The Decals in Figures 4A and 4B are used to identify the proper fuel for the Heater.
They are placed on the heater Housing as shown in Figure 1.
SAFETY
WARNING
0-48693
-FLAME and HOT surfaces
inside cover may cause
serious injury.
-Do not operate with cover
removed.
-Disconnet power & allow
to cool before servicing.
Figure 3. WARNING Decal 0-48693
PROPANE VAPOR /
NATURAL GAS
Read operator's manual for
connection instructions and
burner operating pressures.
0-48695
Figure 4A.
LIQUID PROPANE Decal 0-48694
Figure 4B.
PROPANE VAPOR/NATURAL GAS
Decal 0-48695

SAFETY BROCK® GUARDIAN® CDH Downstream Heater
10 MFH1800C
There are Suffocation Hazards in Flowing Grain!
DANGER! Be aware that where Heaters are installed in conjunction with Grain
Bins, there are other hazards involved. ONLY AUTHORIZED
PERSONNEL should enter a Heater or Grain Bin area.
You CAN suffocate under material in a grain bin/tank.
Entry into ANY grain bin is a potential hazard.
DANGER! NEVER enter the tank during loading or unloading. Failure to follow
these instructions will lead to death or serious injury.
Flowing material may trap and suffocate, as shown in Figures 5 through 7 below.
Crusted material collapses and suffocates, as ahown in Figure 6.
SAFETY
Figure 5.
Flowing Material
Traps and Suffocates
From the time the
auger starts, you
have 2-3 seconds to
react.
In 4-5 seconds, you
are trapped.
After 22 seconds,
you are completely
covered.
Figure 6.
Suffocation Hazards
Figure 7.
Crusted Material Collapses
and Suffocates

BROCK® GUARDIAN® CDH Downstream Heater About This Manual
MFH1800C 11
The intent of this Manual is to help you follow step-by-step instructions for
identification and installation of your BROCK® AXH Heater.
IMPORTANT! Pay particular attention to all SAFETY Information in this Manual.
CAUTION! For operation and use of your Heater, read and understand this Manual.
Failure to follow proper operational procedures may cause personal
injury or equipment damage .
Contact your BROCK Dealer to replace this Manual should it become lost or damaged.
Warranty information is included on the inside front cover of this Manual.
Motor choices and specifications are provided in the Parts Listing section at the back
of this Manual.
Major changes from the last printing will be listed on the back cover.
Definition of Terms
• This Planning Symbol is used in areas where planning needs to take place before
assembly and/or installation continue.
• “Horizontal (-),” and “vertical ( ),” “bottom,” and “top” refer to the Heater as it
is standing.
• “Right hand” (RH) and “left hand” (LH) terms are determined by facing in the
direction of the discharged airflow, i.e., the Inlet would be the RH side of the
Heater, the Motor the LH side.
• Names for components and parts which have BROCK® Part Numbers have been
capitalized throughout this Manual to call attention to them in the installation.
• Photographs may be of prototypes and could vary slightly from actual models.
IMPORTANT! Some Heater Guards have been removed for illustrative purposes only.
Measurements
The symbols ('') equals inches and (') equals feet in English measurements.
Metric measurements are shown in millimeters and square brackets following the
English measurement, unless otherwise specified. For example: 15' [4 572]
90' [27 432]
Metric equivalents are listed after the English measurement and not always repeated
throughout the Manual.
These units of measurement are also used:
• (“) or in -inches
• (‘) or ft -feet
• inlb - inch lb
• ftlb - foot pounds (12 inlbs)
• inlb - inch pounds
• cfm - cubic feet per minute
• inwc - inches water column
• sqft - square feet
• A - amps or amperes
• FLA -full load amps
• V - volts
•Ph -phase
• psi - pounds per square inch
• btu/hr - British thermanl Units per hour
• MMbtu/hr - million btu per hour
• gal/hr - gallons per hour
• cfh - cubic feet per hour
About This Manual

About This Manual BROCK® GUARDIAN® CDH Downstream Heater
12 MFH1800C
Identification of Parts and Hardware
IMPORTANT! No hardware substitutions are permitted unless noted.
Diagrams are provided throughout this Manual to identify Parts and Hardware used
in that application.
• Parts and basic components are identified in Figures and their accompanying
Tables as “Items” with a black number in white circle.
• Hardware (and hardware connections between Parts) are identified with a white
number in a shaded circle. See Figure 8. Hardware Item numbers are listed
after the Parts in a Figure Table.
• Dimensions and lengths are noted with a white circle on an arrow or line, then
identified with numeric values in a Figure Table.
• Very small numbers near an illustration (i.e., 1257-48) are identification of the
graphic, not a Part Number.
Plumbing Fittings Identification
3
2
1
6
7
5
Item Description
1 Locking Hex Nut
2HexNut
3 Flange Nut
4 Flange Head Bolt
5BinSealBolt
6 Gr 8 Hex Head Cap Screw
7 Gr 5 Hex Head Cap Screw
8 Gr 5 Carriage Bolt
1
1Hardware/Part
Connection
Parts
Figure 8. Hardware Identification
8
4
123
456
Nominal Schl 40 Schl 80
Pipe Size OD Wall Wall
1/8 0.405 0.068 0.095
1/4 0.540 0.088 0.119
3/8 0.675 0.091 0.126
1/2 0.840 0.109 0.147
3/4 1.050 0.113 0.154
1 1.315 0.133 0.179
1 1/4 1.660 0.140 0.191
1 1/2 1.900 0.145 0.200
Item Description
1 Elbow 90°
2 Elbow 45°
3Tee
4 Nipple
5 Adapter
6 Bushing
Figure 9. Plumbing Fittings Identification

BROCK® GUARDIAN® CDH Downstream Heater Heater Parts Identification
MFH1800C 13
General Heater
Heater Parts Identification
Item Description
1 Housing
2 Coil, Vaporizer (p. 38)
3 Regulator assembly (pp. 37-38)
4 Intake Plumbing Assembly (pp. 37-38)
5 Fitting, Conduit 1/2''
6 Decal, PV/N Fuel Supply (pp. 6,9)
7 Decal, BROCK® 16''
8 Handle, Plastic (pp. 34-35)
9 Plate, Serial Number (pp. 34-35)
10 Hose, LP (p. 38)
11 Adapter, 3/4 npt x 1/2 msae Elbow (p. 38)
12 Assembly, Standard Plumbing (p. 36)
13 Gauge (p. 36)
14 Control Box Assembly (pp. 14, 41)
15 Decal, DANGER 0-48354 (pp. 6,7)
16 Access Panel (pp. 34-35)
17 Decal, WARNING 0-48693 (pp. 6,9)
18 Burner Assembly (pp. 39-40)
Figure 10. CDH Downstream Heater
3
10
WARNING
0-48693
-FLAME and HOT surfaces
inside cover may cause
serious injury.
-Do not operate with cover
removed.
-Disconnet power & allow
to cool before servicing.
END VIEW
4
5
88
18
1
2
11
12
13
14 17
CONTROL
MIN
PSI
MAX
MMbtu/hr
VOLTS
MIN
MMbtu/hr
Brock Manufacturing
Milford, IN
SUPPLY PRES
INPUT RATE
FUEL TYPE
MODEL
SN
0-48691
BURNER PRES MIN
PSI
MAX
PSI
MAX
PSI
15
2
16
1
3
4
10
8
7
12
11 13
14
9
*

Heater Parts Identification BROCK® GUARDIAN® CDH Downstream Heater
14 MFH1800C
Controls
Figure 11.
Heater Controls 0-48779
20
7
6
Section A Detail
Section A-A Detail
Item Description
1Box,ElecAx
2 Lid, Elec Box 14x16 Blk
3 Panel, Elec. Mounting, AXH
4 Xfmr, Ign 175va 120v-60000v 60h
5 Base, Burner Control
6Control, Burner 115v Flame Rect LME69
7 Switch, Assy Selector 2nc, 1no
8 Nameplate, OFF/ON
9 Operator, Pilot Light Green
10 Nameplate, Power ON
11 Operator, Pilot Light Red
12 Nameplate, FAULT
13 Lamp, Led 120 V White”
14 Terminal, Fuse 15a 1/4 x 1 1/4''
15 Fuse,5a 250v 1/4 x 1-1/4''
16 Terminial, 20a 26-12ga
17 Barrier, End Terminial
18 Clamp, End 35 mm
19 Track, 35mm x 3.88''
20 Lug, Ground 6-14ga
21 Plug, Liquid Tight Knock-seal 7/8''
22 Bushing, Snap Heyco 1/2''
23 Thermostat, Hi Limit 200f Man Reset
24 Conduit, Flex 1/2''
25 Fitting, Conduit, 1/2'' Elbow
26 Wire 10 Ga Green Thhn
27 Wire 16ga Black Thw
28 Wire 16ga White Thw
29 Label,white Unprinted (10) 5 mm
30 Decal, Diagram Heater
31 Decal, Electrical Hazard
32 Decal, BROCK® 12''
33 Screw, Pan #8-32 x 1/2''
34 Screw, Pan 10-32 x 3/8''
35 Latch, Box (Grey)
36 Pivot, Latch (Grey)
37 Seal, Neop Closed Cell .125''
38 Wshr, .203 x .625 x .044 c/z
39 Gasket, 1/4 x 1/2 x 35ft Pvc Foam
40 Wire 16ga White Thw
41 Wire 16ga Red Thw
23
5
14
9
13
11
13
35 36
33
25
3
4
22
24
25
21
38
34
14
18
17
16
18
19
29
31
32
1
2
39
8
10 12

BROCK® GUARDIAN® CDH Downstream Heater Pre-Installation Planning
MFH1800C 15
Tools and Equipment Needed
WARNING! Inventory all tools and pieces of hardware near the Heater during
installation or servicing. Tools left inside in the Heater could cause
personal injury or equipment damage.
• Flat-blade screwdriver
• Saw and blades to cut Heater opening in metal transition
• 1/2" open end wrenches/Socket wrenches with 1/2'' socket
• 5/16'' open-end wrench or a 12-point 3/8'' socket and ratchet
•Hammer
• Wire cutters and wire strippers
• Pipe wrench
• Adjustable wrench
• Pipe sealant
• Leak detection solution (soak solution)
• 12'' drift punch for aligning holes with Transition
• Drill bits
• Tape measure
Heater Inspection
DANGER! Electricity can kill! Inspections MUST be done with the MAIN POWER
LOCKED OUT.
• Check all fasteners for tightness.
• Check inside the Heater Housing for loose objects.
• Inspect electrical controls and wire connections for tightness.
• Retighten any loose hardware, and/or electrical fittings.
• Make a note of your Serial Number and other specifications for your Heater,
found on the Serial Number Identification Plate (Item 9 on Page13). Write the
information in the blanks on Page 4 of this Manual for quick reference.
Venting
Adequately vent your Bin roof to prevent Heater back pressure. For good Heater
performance, the bin should have an exhausted area equal to 1 sq. ft. for each 1500
cfm airflow rate.
Pre-Installation Planning

Pre-Installation Planning BROCK® GUARDIAN® CDH Downstream Heater
16 MFH1800C
Heater Dimensions
Figure 12 shows dimensions for various Heater sizes. Use these Figures, along with
the Heater dimensions, to plan the foundation position before it is installed and before
Heater openings in the Transition Panels are cut.
.
Width Height
MODEL AB C D
inches [mm] inches [mm] inches [mm] inches [mm]
CDH27-10 16 1/4'' [413] 19 1/4'' [489] 30 1/8'' [765] 32 3/4'' [832]
CDH27-15 19 1/8'' [486] 22 1/8'' [562] 30 1/8'' [765] 32 3/4'' [832]
CDH27-20 20 3/8'' [518] 23 3/8'' [594] 30 1/8'' [765] 32 3/4'' [832]
CDH30 21 3/4'' [552] 24 3/4'' [629] 33 1/2'' [851] 36 1/8'' [918]
CDH33-40 22 3/4'' [578] 25 3/4'' [654] 36 13/16'' [935] 39 7/16'' [1 002]
CDH33-50 25 1/8'' [638] 28 1/8'' [714] 36 13/16'' [935] 39 7/16'' [1 002]
Figure 12. Heater Dimensions
A
B
CD

BROCK® GUARDIAN® CDH Downstream Heater Pre-Installation Planning
MFH1800C 17
Bin and Transition Inspection
The bin should be well sealed to prevent air loss from the plenum or the ductwork
below the grain. Caulk all joints, seams, and applicable bin foundation connections
to prevent air leakage at or under the Heater connection or drying Floor.
The Heater Transition should be installed to minimize airflow restriction. The air
entrance needs be as clear as possible from Floor Supports. Use all sealant, caulk or
gaskets which the manufacturer recommends.
A properly fitting, gradually angled Heater Transition is necessary to connect your
Heater to the opening in the Bin.
IMPORTANT! Do NOT use anything for a Transition that would severely angle or
disrupt airflow from the Heater into the bin.
Ask your BROCK® Dealer about BROCK® Heater Transitions. If your BROCK®
Transition has already been ordered, you will need to assemble it using the one of the
following Manuals:
•LOW Transition with 38'' h x 33'' w [965 x 838] Heater Backplate: 9-39788 for
Narrow (2.67'') Corrugated Bins and 9-46450 for (4'') Wide Corrugated Bins:
BROCK® Instruction MGB1499.
•AERATION Transition (9-39786) for Narrow (2.67'') Corrugated Bins:
BROCK® Instruction MGB1500.
•HIGH Transition (9-39787) for Narrow (2.67'') Corrugated Bins: BROCK®
Instruction MGB1501.

Pre-Installation Planning BROCK® GUARDIAN® CDH Downstream Heater
18 MFH1800C
Foundation/Concrete Pad
IMPORTANT! The Heater (and Fan) should be mounted on a level concrete pad that
has been poured at a height determined by the Transition manufac-
turer's instructions.
DO NOT ATTACH the Fan or Heater to the pad. The Fan and Heater need to
have the ability to move freely, therefore not putting the Transition in a bind.
See Figure 15.
See the Heater Dimensions in Figure 12 for suggested Foundation size. Note that
the foundation is wider on the Motor side of the Heater, not centered on the
Transition centerline.
Figure 13. Heater Installation at Bin
2
1
4
563
LEFT SIDE VIEW
DIRECTION OF
AIR FLOW
TOP VIEW
1
2
3
4
5
6
DIRECTION OF AIR FLOW
2
4
5
1
3
6Item Description
1BinSidewall
2 Bin Foundation
3 Fan Transition
4FanPad
5AxialFan
6 AXH Heater

BROCK® GUARDIAN® CDH Downstream Heater Electrical Installation
MFH1800C 19
Wiring SAFETY Reminders
DANGER! Electricity can kill! All electrical wiring MUST be done by a certified/
licensed electrician. All components must meet the National Fire
Protection Association Standard NFPA No. 70, American National
Standard Inst. ANSI-C1, and applicable national, state and local
electrical SAFETY codes.
WARNING! Heater installations shall meet the National Fire Protection Association
Standard 61B for the prevention of fires and explosions in grain
elevators and facilities handling bulk raw agricultural commodities.
Failure to follow this standard could result in death or serious injury.
In selecting electrical control equipment to be used with any installation, the
purchaser must use equipment conforming to the National Electrical Code, the
National Electrical Safety Code and other applicable local or national codes. Follow
all applicable local, state and national electrical codes for wiring.
Heater controls should be so arranged that, in case of emergency stop, manual resets
or starts (at the location where the emergency stop initiated) shall be required for
the Heater(s) and associated equipment to resume operation.
BROCK assumes no responsibility for the electrical wiring used with
this Heater. BROCK will not be liable for damage to the Heater because
of improper electrical installation or use.
IMPORTANT! All SAFETY devices, including wiring of electrical devices shall be
arranged to operate such that a power failure or failure of the device
itself will not result in a hazardous condition.
CAUTION! To prevent a hazardous condition, the Heater MUST be prevented from
restarting on its own after a power failure when power returns.
Install an electric disconnect within reach of each Heater.
CAUTION! Do not jeopardize your BROCK® Heater Warranty with improper
electrical installation!
Electrical Installation

Electrical Installation BROCK® GUARDIAN® CDH Downstream Heater
20 MFH1800C
Electrical Connection
Control power - The Heater is designed for 115v connections. If the Fan does not
have 115v controls, a 250va step-down Transformer may be required to reduce the
control voltage. Consult the Fan manufacturer for recommendations.
Control Transformer size - 380, 460v, and 575v GUARDIAN® Series BROCK®
Fans are equipped with a 100va control Transformer. It must be changed to a 250va
transformer to carry the Heater load.
Power Interlocking
Connect the Heater Power Conduit to the Fan Control Box. In the Fan Control Box,
connect the:
•Black wire to 115v interlocked power, Terminal #7 in BROCK® Fans.
•White neutral wire to neutral, Terminal #2 in BROCK® Fans.
•Green ground wire to the ground lug in the Fan Control Box.
WARNING! Connect only to a 115v electrical control source, which is interlocked to
the Fan Motor. The Heater power must shut off when the Fan Motor is
not operating for any reason. If the Fan Motor is wired with internal
thermo protection, it must be wired so that the power to the contactor
and the Heater is removed when the thermo device trips. If these
instructions are not followed, equipment damage and/or personal injury
could result.
380 460 575
Transformer PN 0-48244 0-48240 0-48242
Voltage
0-48876
Figure 14. Fan Control
Figure 15. Heater Control
OVERLOAD ADJUSTMENT OVERLOAD RESET
AUXILIARY CONTACTS
CONTROL FUSE, 2A
TERMINAL #7
TERMINAL #2, NEUTRAL