S-SERIES
®
DIRECT GAS-FIRED
INDUSTRIAL BLOW-THRU® SPACE HEATER
TECHNICAL MANUAL
mWARNING:
Improper installation, adjustment, alteration, service or maintenance can cause property damage, injury or death. Read the installation, operating, and maintenance instructions thoroughly
before installing or servicing this equipment.
FOR YOUR SAFETY
The use and storage of gasoline or other flammable vapors and liquids in open containers in
the vicinity of this appliance is hazardous.
FOR YOUR SAFETY
If you smell gas:
1. Open windows.
2. Don’t touch electrical switches.
3. Extinguish any open flame.
4. Immediately call your gas supplier.
Made in the USA
ASHRAE
ASHRAE
90.1
COMPLIANT
COMPLIANT
®
S-TM7-02-18
S400-S3200 REV. F
LIMITED WARRANTY
Cambridge Engineering's Limited Warranty is included within the Terms and Conditions that are sent
with every Order Acknowledgement. For questions regarding Limited Warranty, contact Cambridge
Engineering's Customer Service Group at 1-800-473-4569.
S-SERIES
BLOW-THRU
®
SPACE HEATER
Contents
Hazard Summary ..............................................................................................................2
Typical System Overview ................................................................................................. 3
Accessory Identication .................................................................................................. 3
Heater Operation ............................................................................................................. 4
Heater Conguration ....................................................................................................... 4
Installation Instructions ..................................................................................................... 5
Uncrating Instructions ..................................................................................................... 5
Mounting Location ..........................................................................................................5
Roof Top Mounting - Curb / Stand / Rail .......................................................................6
Roof Top / Thru Wall Mounting - Stand / Rail ...............................................................7
Under Roof Mounting - Curb .........................................................................................7
Roof Top Mounting .........................................................................................................8
Thru Wall Mounting ...................................................................................................... 10
Roof Top / Thru Wall Mounting ...................................................................................12
Under Roof Mounting ................................................................................................... 14
Vertical Indoor Mounting .............................................................................................. 16
Vertical Outdoor Mounting ...........................................................................................18
Rain Hood Inlet Skirt ................................................................................................... 20
Unit Inlet Skirt ..............................................................................................................21
Gas Piping ..................................................................................................................... 22
Electrical Wiring .......................................................................................................... 23
Start-Up Instructions ....................................................................................................... 24
Calibration Procedures ................................................................................................... 29
Operating Instructions ..................................................................................................... 32
Operating Sequence ......................................................................................................32
Electronic Thermostat ................................................................................................... 33
TSS Controller .............................................................................................................35
Maintenance Instructions ................................................................................................ 44
Troubleshooting Instructions ..........................................................................................48
Troubleshooting Guide..................................................................................................48
Damper Motor Replacement & Adjustment .................................................................54
Reference ........................................................................................................................56
Electrical Control Enclosure Isometric Drawing .......................................................... 56
Electrical Wiring Diagrams .......................................................................................... 57
Electrical Connection Diagram .................................................................................... 62
Gas Train Drawings ......................................................................................................63
Individual Component Descriptions .............................................................................67
ANSI/ASHRAE/IESNA Standard 90.1 ........................................................................73
TECHNICAL MANUAL
Copyright 2018
Cambridge Engineering, Inc.
All Rights Reserved
Cambridge Engineering, Inc.
760 Long Road Crossing Dr.
Chesterfield, MO. 63005
Phone: (636) 532-2233, (800) 899-1989
Fax: (636) 530-6133
www.cambridge-eng.com
HAZARD SUMMARY
Hazard Identification
Warnings and Cautions appear at appropriate sections throughout this manual. Read these carefully.
mWARNING: Indicates a potentially hazardous situation which could result in
death or serious injury.
CAUTION: Indicates a situation that may result in accidents with equipment or
mCAUTION: Indicates a potentially hazardous situation which may result in
minor or moderate injury. It may also be used to alert against
unsafe practices.
property damage only.
The following safety precautions apply to the installation, operation, and maintenance of the equipment
described by this technical manual.
mWARNING:
Any unauthorized modification of this equipment
shall void the warranty.
mWARNING:
Only qualified personnel should attempt installation, service, and repair of this equipment. Use
extreme caution and observe safety regulations at
all times.
mWARNING:
Recirculation of room air is not permitted.
Adequate building relief must be provided so as to not
over pressurize the building when the heating system
is operating at its rated capacity. It should be noted
that this can be accomplished by taking into account,
through standard engineering methods, the structure’s
designed infiltration rate, by providing properly sized
relief openings, or by interlocking a powered exhaust
system, or by a combination of these methods.
If the failure or malfunction of this heater creates a
hazard to other fuel burning equipment in the building, (e.g. when the heater is providing the make-up air
to a boiler room), the unit is to be interlocked to open
inlet air dampers or other such devices.
If the heater is installed such that an inlet duct is
utilized, the duct system must be purged with at least
four air changes prior to an ignition attempt.
Installation in Aircraft Hangars
Refer to the Standard for Aircraft Hangars,
ANSI/NFPA 409, for specific information on the
installation requirements for these heaters in aircraft hangars.
Installation in Parking Garages
Refer to the Standard for Parking Structures, ANSI/
NFPA 88A, or the Standard for Repair Garages,
ANSI/NFPA 88B, for specific information on the
installation requirements for these heaters in public
garages.
Installation in Car Wash Facilities
A non-recirculating, S-Series Space Heater used in a
Car Wash tunnel application may be designated as a
T-Series Heater on the nameplate.
This S-Series Technical Manual also applies to all
T-Series Heaters.
IMPORTANT
If in doubt regarding installation application, contact Cambridge Customer Service Group at 1-800473-4569 during the hours of 8:00 a.m. to 5:00 p.m.
Central Time, Monday through Friday.
Cambridge Engineering, Inc. 2 S-Series Technical Manual
TYPICAL SYSTEM OVERVIEW
RH-RT
MDD
DT
UNIT
DE
DE
DE
IP
ISU
ACCESSORY IDENTIFICATION
Under Roof Mounting
RH-TW
ISR
Roof Top Mounting
AMS
MR
DD
DE
Thru Wall Mounting
MC
ID
DT
MC
MDD
IE
UNIT
Outdoor Vertical Mounting
MDD
DT
DT
MDD
UNITFS
UNIT
WALL SLEEVE
(BY OTHERS)
DT
DE
Roof Top / Thru Wall Mounting
RH-RT
AMS
Component Identification
AMS Adjustable Mounting Stand
DD Discharge Duct
DE Directional Elbows
DT Downturn
FS Filter Section
ID Inlet Duct
IE Inlet Elbow
IP Inlet Plenum
ISR Inlet Skirt-Rain Hood
ISU Inlet Skirt-Unit
MC Mounting Curb
MDD Motorized Discharge Damper
MR Mounting Rail
RH-RT Rain Hood-Roof Top
RH-TW Rain Hood-Thru Wall
UNIT
MDD
MR
WALL SLEEVE
(BY OTHERS)
DT
DE
Indoor Vertical Mounting
DT
DT
UNIT
RH-TW
IE
ISR
S-Series Technical Manual 3 Cambridge Engineering, Inc.
TYPICAL SYSTEM OVERVIEW
HEATER OPERATION
Cambridge S-Series Blow-Thru® heaters are utilized
to meet the space heating requirements of commercial
or industrial buildings. The control system is typically
designed to cycle the heaters on and off in response to
the rise and fall of the space temperature. The heater
will discharge air at the temperature selected (up to
HEATER CONFIGURATION
160ºF). The operating thermostat is typically located
near the perimeter of the building in a location which
is out of the direct path of the heated discharge air,
insulated from cold surfaces, and shielded from cold
drafts created by air infiltrating the building.
IGNITER & FLAMEROD
BURNER ASSEMBLY
DAMPER MOTOR
DISCHARGE TEMPERATURE SENSOR
ELECTRICAL CONTROL
ENCLOSURE
HINGED ACCESS DOOR
PORT FOR MEASURING
MANIFOLD PRESSURE
MODULATING GAS VALVE
SAFETY SHUT-OFF VALVE
LEAK TEST PORT
SHUT-OFF VALVE
DISCHARGE AIR TEMPERATURE
SAMPLING BOX
MANUAL SHUT-OFF VALVE BURNER VIEWPORT
HIGH LIMIT
DAMPER BLADES
REGULATOR
Cambridge Engineering, Inc. 4 S-Series Technical Manual
INSTALLATION INSTRUCTIONS
UNCRATING INSTRUCTIONS
1. Verify that the number of items on the Bill of
Lading matches the number of items received.
2. Check for shipping damage. Take photographs of
any damage.
IMPORTANT
If damage is found, immediately file a claim with the
carrier before proceeding further.
3. Check the items received to make sure they agree
with the ordering information including verification
of data on the unit nameplate.
IMPORTANT
Do not discard any components or accessories.
MOUNTING LOCATION
Verify feasibility of the installation location selected
with respect to accessibility to the heater for service
and maintenance functions. Ensure the positioning of
the heater does not inhibit fork truck operation, storage rack locations, or other operations within the facility. Ensure the heater inlet and outlet are not blocked
or severely restricted in any way that would affect the
rated airflow through the heater or affect the desired
air distribution pattern of the heater.
It is the responsibility of the installer to communicate
any potential problems with the installation to the person or persons responsible for providing the installation instructions or drawings prior to proceeding with
the installation.
IMPORTANT
Where the mounting height of the heater is a consideration, work platforms or service lifts should be
provided for accessibility to the equipment for service and maintenance activities.
IMPORTANT
Field constructed intake accessories should be designed to minimize the entry of snow and rain.
IMPORTANT
The minimum clearance from the face of the electrical control enclosure to surrounding grounded
surfaces for service activities is 42". Adequate clearance of 42" for burner removal is also required.
Access for service functions is also required on the
side of the unit opposite the control enclosure for a
distance of 24".
S-Series Technical Manual 5 Cambridge Engineering, Inc.
INSTALLATION INSTRUCTIONS
ROOF TOP MOUNTING - CURB / STAND / RAIL
STAND DETAIL
2 x 6 TREATED LUMBER
(BY OTHERS)
NOTES
1
TREATED TIMBER AS REQUIRED UNDER MOUNTING
CURB, RAIL AND STAND TO SECURE AND LEVEL UNIT.
2
SECURE MOUNTING STAND TO TIMBER WITH WOOD LAG
SCREWS AS SHOWN.
3
SECOND MOUNTING ASSEMBLY IS REQUIRED ONLY ON
6
10½"
7
DOWNTURN / CURB
WITH FLASHING
ROOF INSULATION
UNITS WITH FILTER SECTIONS.
4
MOUNTING STAND CONSTRUCTION:
12 GA. GALVANIZED STEEL
5
MOUNTING RAIL CONSTRUCTION:
18 GA. GALVANIZED STEEL
6
REMOVE HANGER BRACKET AND REPLACE SCREWS
7
ADJUSTABLE ± 3¾"
24"
REF.
2
1
2 X 6 TREATED LUMBER
Model A B C
S400/S800
S950/S1200/S1600
S1850/S2200/S3200
24"
TYP.
C
MOUNTING STAND
MOUNTING RAIL
B
65½" 33¼" 25 3/8"
78 5/8" 33¼" 42"
90¼" 36¼" 47 1/8"
4
5
A
CURB SECTION
3
2.5"
1 5/8"
FLASHING
2 x 2 WOOD NAILER
(PROVIDED)
INSULATION
Cambridge Engineering, Inc. 6 S-Series Technical Manual
INSTALLATION INSTRUCTIONS
ROOF TOP / THRU WALL MOUNTING - STAND / RAIL
STAND DETAIL
2 x 6 TREATED LUMBER
(BY OTHERS)
2
1
24"
TYP.
NOTES
1
TREATED TIMBER AS REQUIRED UNDER MOUNTING RAIL
AND STAND TO SECURE AND LEVEL UNIT.
2
SECURE MOUNTING STAND TO TIMBER WITH WOOD LAG
SCREWS AS SHOWN.
3
THIRD MOUNTING ASSEMBLY IS REQUIRED ONLY ON
6
10½"
7
ROOF INSULATION
UNITS WITH FILTER SECTIONS.
4
MOUNTING STAND CONSTRUCTION:
12 GA. GALVANIZED STEEL
5
MOUNTING RAIL CONSTRUCTION:
18 GA. GALVANIZED STEEL
6
REMOVE HANGER BRACKET AND REPLACE SCREWS
7
STAND IS ADJUSTABLE ±3¾"
C
MOUNTING STAND
MOUNTING RAIL
4
5
2 X 6 TREATED LUMBER
B
3
UNDER ROOF MOUNTING - CURB
CURB
24"
REF.
A
Model A B C
S400/S800
S950/S1200/S1600
S1850/S2200/S3200
57 7/8" 33¼" 25 3/8"
69 7/8" 33¼" 42"
75¾" 36¾ " 47 1/8"
CURB SECTION
2 x 2 WOOD NAILER
(PROVIDED)
INSULATION
2.5" 1 5/8"
ROOF INSULATION
S-Series Technical Manual 7 Cambridge Engineering, Inc.
INSTALLATION INSTRUCTIONS
ROOF TOP MOUNTING
mWARNING:
Due to the size and weight of this equipment, it
is recommended the heater mounting structure be
reviewed and approved by a qualified structural
engineer and the roof manufacturer before installing this equipment.
IMPORTANT
Before proceeding with the installation, verify the
feasibility of the location selected with respect to
accessibility for service and maintenance functions.
IMPORTANT
To minimize snow and rain ingestion, position the
heater inlet opposite the prevailing winds.
mCAUTION
To prevent contaminated air from being drawn
into the heater, install the heater’s inlet at least
10 feet from any building exhaust, process exhaust, sewer stacks, or other sources that would
allow contaminants to be drawn into the heater.
Consult local codes for additional references.
1. Prepare roof penetration to the dimensions below.
See page 6 for Roof Top Mounting - Curb/Stand/
Rail drawing.
IMPORTANT
Accurate measurements are critical and will affect
the installation process. Verify that the roof opening
aligns with the curb opening.
2. Secure the mounting curb and mounting rail(s) per
the structural engineer and roof manufacturer’s recommendations.
Cambridge recommends mounting the heater a minimum of 24" off the roof surface in areas where snow
accumulation could impact heater operations.
3. Attach the mounting stands to the heater while the
heater is on the ground. Adjust the height of the
stands so the heater inlet is slightly (1/8” below
level) lower than the discharge. This allows any
ingested moisture to drain out of the heater, through
weep holes located at the inlet of the heater, onto
the roof surface.
4. Lower the discharge duct through the mounting
curb and the roof opening and secure the counterflashing to the mounting curb.
5. Use a crane or comparable lifting device to raise
and position the equipment. Use a spreader bar to
prevent damage and connect slings to the lifting
brackets.
mWARNING:
Do not attach lifting means to heater accessories.
Make connections to heater only.
IMPORTANT
Inlet accessories may be attached on the ground or
on the roof depending on the method chosen by the
installer.
6. Caulk all the joints between the heater and the
accessories with silicone caulk to prevent water
leaks.
IMPORTANT
Do not caulk the downturn/counterflashing for the
curb interface.
7. Seal all roof penetrations to prevent roof leaks.
IMPORTANT
The roof curb and mounting rail(s) should be
installed so that the heater will mount level.
Model L W
S400/S800
S950/S1200/S1600
S1850/S2200/S3200
* Dimensions allow for ¾" clearance on each side
Weight
550 lbs. 13" 24¾"
800 lbs. 15" 41½"
1500 lbs. 24¼" 46½"
8. Install the directional elbows. Consult the job layout for the orientation of the elbows.
Roof Opening*
Cambridge Engineering, Inc. 8 S-Series Technical Manual
TYPICAL INSTALLATION
ROOF TOP MOUNTING
RAIN HOOD
FILTER SECTION
(OPTIONAL)
UNIT
ADJUSTABLE MOUNTING STAND
MOUNTING RAIL
ELECTRICAL CONTROL ENCLOSURE
(PROVIDED WITH EXTERNAL GAS TRAIN)
EXTERNAL GAS TRAIN WITH ENCLOSURE
(APPLICABLE TO SOME FM AND XL GAPS OPTIONS)
XL GAPS: FORMERLY IRI (INDUSTRIAL RISK INSURERS)
ELECTRICAL JUNCTION BOX
FM: FACTORY MUTUAL
CURB / RAIL / STAND DETAIL
DOWNTURN
NOTE:
DO NOT CAULK
THIS JOINT
COUNTERFLASHING
MOUNTING CURB
DISCHARGE DUCT
DIRECTIONAL
ELBOWS
2 X 6 TREATED LUMBER
2 X 4 TREATED LUMBER
(BY OTHERS)
(PROVIDED)
TREATED LUMBER
(BY OTHERS)
TREATED LUMBER (THICKNESS OF ROOF INSULATION) AS
REQUIRED UNDER MOUNTING STANDS AND CURB TO SECURE
AND LEVEL THE UNIT AND TO SPREAD THE LOAD. (BY OTHERS)
10½"
12"
TREATED LUMBER
(BY OTHERS)
24"
ROOF
OPENING
S-Series Technical Manual 9 Cambridge Engineering, Inc.
INSTALLATION INSTRUCTIONS
THRU WALL MOUNTING
mWARNING:
Due to the size and weight of this equipment, it
is recommended the heater mounting structure be
reviewed and approved by a qualified structural
engineer before installing this equipment.
IMPORTANT
Before proceeding with the installation, verify the
feasibility of the location selected with respect to
accessibility to the equipment for service and maintenance functions.
mCAUTION
To prevent contaminated air from being drawn into
the heater, install the heater’s inlet at least 10 feet
from any building exhaust, process exhaust, sewer
stacks, or other sources that would allow contaminants to be drawn into the heater. Consult local
codes for additional references.
1. Prepare wall penetration to the dimensions below.
2. Connect inlet accessories to the unit including
filter section (optional) and rain hood prior to lifting the heater in place. Note the inlet skirt for rain
hood (optional) is installed from the outside of the
building (page 20).
3. Install hanging rods to adequate ceiling supports
and align with the hanging brackets on the unit.
Refer to hanging rod size shown on table below.
Locate the hanging rods so that the weep holes
provided in the rain hood are located a minimum
of 3" beyond the outside wall surface.
5. Use a forklift or comparable lifting device to raise
and position the heater. Take precautions to prevent equipment damage (dents and/or scratches)
when the heater is being lifted into position.
6. Use washers and double lock nuts to secure the
unit on the hanging rods.
IMPORTANT
The discharge end of the heater should be raised
slightly (1/8" above level). This allows any ingested
moisture to drain out of the heater through weep
holes located in the rain hood to the exterior of the
building.
7. Apply shims, by others, at the bottom of the rain
hood to take up slack in the opening, leaving a
small joint between the top of the rain hood and
the wall.
8. Install fiberglass insulation in the gaps around the
wall opening and the rain hood. Apply enough
material to accommodate the full thickness of the
wall.
9. Install finish trim pieces (by others) to the top,
sides and bottom of the rain hood on both the
inside and outside wall surfaces.
10. Apply silicone caulk at the joint between the top
of the rain hood and the outside wall surface.
Make certain this is a continuous bead and that it
runs the entire width of the rain hood. Caulk all
other exposed joints.
11. Install the directional elbows. Consult the job layout for the orientation of the elbows.
4. Remove the lag bolts used to fasten the unit to the
skid. Do not remove the hanging brackets from the
side of the heater. On S400/S800 model heaters,
rotate the mounting brackets 180˚ and retighten
the securing hardware.
Hanging Rods Wall Opening**
Model Qty. Size A B* C H W
S400/S800
S950/S1200/S1600
S1850/S2200/S3200
*For optional lter section
** Dimensions allow for 1" clearance on each side
Weight
550 lbs. 4 (6*) 3/8" dia. 57 7/8" 33¼" 27 7/8" 26" 25½"
800 lbs. 4 (6*) 3/8" dia. 69 7/8" 33¼" 43 7/8" 29" 42¼"
1500 lbs. 4 (6*) 1/2" dia. 75¾" 36¾" 48 7/8" 38¾" 47¼"
Cambridge Engineering, Inc. 10 S-Series Technical Manual
TYPICAL INSTALLATION
THRU WALL MOUNTING
RAINHOOD
EXTERIOR WALL TRIM
(BY OTHERS)
INTERIOR WALL TRIM
(BY OTHERS)
ELECTRICAL CONTROL ENCLOSURE
(LOCATE MIN. 10 FT. FROM INTAKE)
VENT w/SCREEN
VENT PIPE TO OUTDOORS
INCOMING POWER
(BY OTHERS)
CONTROL WIRING CONDUIT
(BY OTHERS)
REMOTE CONTROL STATION
INLET GAS PIPE
FILTER SECTION
(OPTIONAL)
UNIT
HANGING BRACKET
LOW PRESSURE SHUT-OFF VALVE
HIGH PRESSURE REGULATOR (HPR)
HIGH PRESSURE SUPPLY TAP
HIGH PRESSURE SHUT-OFF VALVE
HANGING ROD
(BY OTHERS)
DOWNTURN
DIRECTIONAL
ELBOWS
(OPTIONAL)
SEDIMENT TRAP
(BY OTHERS)
HANGING ROD DETAILHANGING BRACKET DETAIL
HANGING ROD
NUT
WASHER
DOUBLE LOCK NUTS
SHIPPING POSITION
WASHER
HANGING RODS, NUTS AND WASHERS BY OTHERS
L BRACKET
FOR S400 - S800 UNITS
HANGING ROD
NUT
WASHER
DOUBLE LOCK NUTS
WASHER
C BRACKET
FOR S950 - S3200 UNITS
S-Series Technical Manual 11 Cambridge Engineering, Inc.
INSTALLATION INSTRUCTIONS
ROOF TOP / THRU WALL MOUNTING
mWARNING:
Due to the size and weight of this equipment, it
is recommended the heater mounting structure be
reviewed and approved by a qualified structural
engineer and the roof manufacturer before installing this equipment.
IMPORTANT
Before proceeding with the installation, verify the fea-
sibility of the location selected with respect to acces-
sibility to the equipment for service and maintenance
functions.
IMPORTANT
To minimize snow and rain ingestion, position the
heater inlet opposite the prevailing winds.
mCAUTION
To prevent contaminated air from being drawn
into the heater, install the heater’s inlet at least 10
feet from any building exhaust, process exhaust,
sewer stacks, or other sources that would allow
contaminants to be drawn into the heater. Consult
local codes for additional references.
1. Prepare wall penetration to the dimensions below.
See page 7 for Roof Top/Thru Wall Mounting
Stand/Rail drawing.
IMPORTANT
Accurate measurements are critical and will affect
installation process.
2. Secure the mounting rails per the structural engi-
neer and roof manufacturer’s recommendations.
IMPORTANT
The mounting rails should be installed so that the
heater will mount level. Cambridge recommends
mounting the heater a minimum of 24" off the roof
surface in areas where snow accumulation could
impact heater operations
3. Attach the mounting stands to the heater while
the heater is on the ground. Adjust the height
of the stands so the heater inlet is slightly (1/8”
below level) lower than the discharge. This allows
any ingested moisture to drain out of the heater,
through weep holes located at the inlet of the
heater, onto the roof surface.
4. Use a crane or comparable lifting device to raise
and position equipment. Use a spreader bar to
prevent damage and connect slings to the lifting
brackets.
mWARNING:
Do not attach lifting means to heater accessories.
Make connections to heater only.
IMPORTANT
Inlet accessories may be attached on the ground or
on the roof depending on the method chosen by the
installer.
5. Install the wall sleeve to the heater discharge.
6. Install fiberglass insulation in gaps around the
wall opening and wall sleeve. Apply enough material to accommodate the full thickness of the wall.
7. Install finish trim pieces (by others) to top, sides
and bottom of the wall sleeve on both the inside
and outside wall surfaces.
8. Apply silicone caulk at the joint between the top
of the wall sleeve and the outside wall surface.
Make certain this is a continuous bead and that it
runs the entire width of the wall sleeve. Caulk all
other exposed joints.
9. Seal all roof penetrations to prevent roof leaks.
10. Install the downturn and directional elbows.
Consult the job layout for the orientation of the
elbows.
Wall Opening*
Model H W
S400/S800
S950/S1200/S1600
S1850/S2200/S3200
* Dimensions allow for 1½" clearance on each side
Weight
550 lbs. 16" 28¼"
800 lbs. 18" 45"
1500 lbs. 27½" 50"
Cambridge Engineering, Inc. 12 S-Series Technical Manual
TYPICAL INSTALLATION
ROOF TOP / THRU WALL MOUNTING
RAIN HOOD
ADJUSTABLE MOUNTING STAND
MOUNTING RAIL
FILTER SECTION
(OPTIONAL)
UNIT
WALL SLEEVE
EXTERIOR WALL TRIM
(BY OTHERS)
INTERIOR WALL TRIM
(BY OTHERS)
ELECTRICAL CONTROL ENCLOSURE
(PROVIDED WITH EXTERNAL GAS TRAIN)
EXTERNAL GAS TRAIN WITH ENCLOSURE
(APPLICABLE TO SOME FM AND XL GAPS OPTIONS)
ELECTRICAL JUNCTION BOX
STAND DETAIL
2 X 6 TREATED LUMBER
2 X 4 TREATED LUMBER
(BY OTHERS)
(PROVIDED)
10½"
12"
DOWNTURN
DIRECTIONAL
ELBOWS
TREATED LUMBER
(BY OTHERS)
S-Series Technical Manual 13 Cambridge Engineering, Inc.
INSTALLATION INSTRUCTIONS
UNDER ROOF MOUNTING
mWARNING:
Due to the size and weight of this equipment, it
is recommended the heater mounting structure be
reviewed and approved by a qualified structural
engineer and the roof manufacturer before installing this equipment.
IMPORTANT
Before proceeding with the installation, verify the
feasibility of the location selected with respect to
accessibility to the equipment for service and maintenance functions.
m CAUTION
To prevent contaminated air from being drawn
into the heater, install the heater’s inlet at least 10
feet from any building exhaust, process exhaust,
sewer stacks, or other sources that would allow
contaminants to be drawn into the heater. Consult
local codes for additional references.
1. Prepare roof penetration to the dimensions below.
See page 7 for Under Roof Mounting - Curb
drawing
IMPORTANT
Accurate measurements are critical and will affect
the installation process. Verify that the roof opening
aligns with the curb opening.
IMPORTANT
The mounting curb or mounting structure should
be installed such that the heater’s inlet plenum will
mount level.
3. Seal all roof penetrations to prevent roof leaks.
4. Lower the inlet duct through the mounting curb
and the roof opening.
5. Secure the inlet plenum to the curb.
6. Connect inlet accessories to the heater including
filter section (optional) and inlet elbow prior to
lifting the heater in place.
7. Install hanging rods to adequate ceiling supports
and align with the hanging brackets on the heater.
Refer to hanging rod size shown on table below.
8. Remove the lag bolts used to fasten the unit to the
skid. Do not remove the hanging brackets from the
side of the heater. On S400/S800 model heaters,
rotate the hanging brackets 180˚, and retighten the
securing hardware.
9. Use a forklift or comparable lifting device to raise
and position the heater. Take precautions to prevent equipment damage (dents and/or scratches)
when the heater is being lifted into position.
10. Use washers and double lock nuts to secure equipment on the hanging rods.
2. Install the mounting curb and the mounting structure per the structural engineer and roof manufacturer’s recommendations.
Model Qty. Size A B* C L W
S400/S800
S950/S1200/S1600
S1850/S2200/S3200
*For optional lter section
** Dimensions allow for ¾" clearance on each side
Weight
550 lbs. 4 (6*) 3/8" dia. 57 7/8" 33¼" 27 7/8" 25" 25"
800 lbs. 4 (6*) 3/8" dia. 69 7/8" 33¼" 43 7/8" 30" 41¼"
1500 lbs. 4 (6*) 1/2" dia. 75¾" 36¾" 48 7/8" 37¼" 46¾"
11. Install the directional elbows. Consult the job layout for the orientation of the elbows.
Hanging Rods Roof Opening**
Cambridge Engineering, Inc. 14 S-Series Technical Manual
TYPICAL INSTALLATION
UNDER ROOF MOUNTING
FILTER SECTION (OPTIONAL)
CURB DETAIL
TREATED LUMBER (THICKNESS OF ROOF INSULATION) AS
REQUIRED UNDER MOUNTING CURB TO SECURE AND LEVEL
THE UNIT AND TO SPREAD THE LOAD. (BY OTHERS)
HANGING ROD DETAILHANGING BRACKET DETAIL
HANGING ROD
NUT
WASHER
DOUBLE LOCK NUTS
SHIPPING POSITION
WASHER
HANGING RODS, NUTS AND WASHERS BY OTHERS
L BRACKET
FOR S400 - S800 UNITS
HANGING ROD
NUT
WASHER
DOUBLE LOCK NUTS
WASHER
C BRACKET
FOR S950 - S3200 UNITS
S-Series Technical Manual 15 Cambridge Engineering, Inc.
INSTALLATION INSTRUCTIONS
VERTICAL INDOOR MOUNTING
mWARNING:
Due to the size and weight of this equipment, it
is recommended the heater mounting structure be
reviewed and approved by a qualified structural
engineer before installing this equipment.
IMPORTANT
Before proceeding with the installation, verify the
feasibility of the location selected with respect to
accessibility to the equipment for service and maintenance functions.
m CAUTION
To prevent contaminated air from being drawn
into the heater, install the heater’s inlet at least 10
feet from any building exhaust, process exhaust,
sewer stacks, or other sources that would allow
contaminants to be drawn into the heater. Consult
local codes for additional references.
1. Prepare wall penetration to the dimensions below.
2. Connect the inlet accessories to the heater including
the filter section (optional), the inlet elbow and the
rain hood prior to standing the heater upright. Note
the inlet skirt for the rain hood (optional) is installed
from the outside of the building (page 20).
3. Install hanging rods to adequate ceiling and/or wall
supports per the structural engineer’s recommendations and align with the hanging brackets on the
heater. Refer to the hanging rod size shown on the
table below. Locate the hanging rods so that the
weep holes provided in the rain hood are located a
minimum of 3" beyond the outside wall surface.
4. Remove the lag bolts used to fasten the unit to the
skid. Rotate the hanging brackets for the vertical
application and retighten the securing hardware.
5. Utilizing the lifting brackets on the front of the heater,
use a forklift or comparable lifting device to raise
and position the heater. Take precautions to prevent
equipment damage (dents and/or scratches) when the
heater is being lifted into position.
6. Use washers and double lock nuts to secure equipment on hanging rods.
IMPORTANT
The rain hood should be sloped slightly (1/8" off
level). This allows any ingested moisture to drain
out of the heater through weep holes located in the
rain hood to the exterior of the building.
7. Apply shims at the bottom of the rain hood to take up
slack in the opening, leaving a minimal joint between
the top of the rain hood and the wall.
8. Install fiberglass insulation in the gaps around the
wall opening and the rain hood. Apply enough material to accommodate the full thickness of the wall.
9. Install finish trim pieces (by others) to the top, sides
and bottom of the rain hood on both the inside and
outside wall surfaces.
10. Apply silicone caulk at the joint between the top
of the rain hood and the outside wall surface.
Make certain this is a continuous bead and that it
runs the entire width of the rain hood. Caulk all
other exposed joints.
11. Install the second downturn and directional
elbows. Consult the job layout for the orientation
of the elbows.
Hanging Rods Wall Opening*
Model Qty. Size A B H W
S400/S800
S950/S1200/S1600
S1850/S2200/S3200
* Dimensions allow for 1" clearance on each side
Weight
650 lbs. 4 3/8" dia. 23 3/8" 27 7/8" 26" 25½"
950 lbs. 4 3/8" dia. 26" 43 7/8" 29" 42¼"
1750 lbs. 4 1/2" dia. 34 7/8" 48 7/8" 38¾" 47¼"
Cambridge Engineering, Inc. 16 S-Series Technical Manual
TYPICAL VERTICAL INDOOR INSTALLATION
STRUCTURAL
KNEE BRACE
(BY OTHERS)
mWARNING:
The primary structural support
element of a vertically mounted
heater is the base. Any support to
the heater cabinet should be considered secondary, only as a means
to help stabilize the heater.
HANGING ROD DETAIL
SECOND DOWNTURN
(OPTIONAL)
DOWNTURN
SECOND DOWNTURN
(OPTIONAL)
GAS TRAIN WIRING
(FIELD CONNECTED)
DIRECTIONAL
ELBOWS
GAS TRAIN
HANGING ROD
(BY OTHERS)
UNIT
BASE OF HEATER
ELECTRICAL CONTROL
ENCLOSURE
FILTER SECTION
(OPTIONAL)
INLET ELBOW
DOWNTURN
SHIPPING POSITION
MOUNTING POSITION
FOR S400 - S800 UNITS
DOUBLE LOCK NUTS
L BRACKET
HANGING BRACKET DETAIL
HANGING RODS, NUTS AND WASHERS BY OTHERS
HANGING ROD
NUT
WASHER
WASHER
DOUBLE LOCK NUTS
RAIN HOOD
HANGING ROD
NUT
WASHER
WASHER
INTERIOR WALL TRIM
(BY OTHERS)
EXTERIOR WALL TRIM
(BY OTHERS)
SHIPPING POSITION
MOUNTING POSITION
C BRACKET
FOR S950 - S3200 UNITS
S-Series Technical Manual 17 Cambridge Engineering, Inc.
INSTALLATION INSTRUCTIONS
VERTICAL OUTDOOR MOUNTING
mWARNING:
Due to the size and weight of this equipment, it
is recommended the heater mounting structure be
reviewed and approved by a qualified structural
engineer before installing this equipment.
IMPORTANT
Before proceeding with the installation, verify the
feasibility of the location selected with respect to
accessibility to the equipment for service and maintenance functions.
mCAUTION
To prevent contaminated air from being drawn
into the heater, install the heater’s inlet at least 10
feet from any building exhaust, process exhaust,
sewer stacks, or other sources that would allow
contaminants to be drawn into the heater. Consult
local codes for additional references.
1. Prepare wall penetration to the dimensions below.
6. Secure the heater in place with contractor supplied
hardware.
7. Install the wall sleeve to the downturn.
8. Install fiberglass insulation in the gaps around the
wall opening and the wall sleeve. Apply enough
material to accommodate the full thickness of the
wall.
9. Install finish trim pieces (by others) to the top,
sides and bottom of the wall sleeve on both the
inside and outside wall surfaces.
10. Apply silicone caulk at the joint between the wall
sleeve and the outside wall surface. Make certain
this is a continuous bead and that it runs the entire
width of the wall sleeve. Caulk all other exposed
joints.
11. Mount the gas train enclosure to the wall structure
and connect gas piping between the heater and the
enclosure.
2. Connect the inlet accessories to the heater including the filter section (optional).
3. Install structural uprights and associated wall supports per structural engineers recommendations.
4. Remove the lag bolts used to fasten the unit to the
skid.
5. Utilizing the lifting brackets on the front of the
heater, use a forklift or comparable lifting device
to raise and position the heater. Take precautions to prevent equipment damage (dents and/
or scratches) when the heater is being lifted into
position.
Model A B C H W
S400/S800
S950/S1200/S1600
S1850/S2200/S3200
* Dimensions allow for 1½" clearance on each side
Weight
500 lbs. 57 7/8" 33¼" 27 7/8" 16" 25¼"
750 lbs. 69 7/8" 33¼" 43 7/8" 18" 42½"
1500 lbs. 75¾" 36¾" 48 7/8" 27½" 47¾"
12. Install the inlet skirt to the heater inlet and attach
the skirt extension to the exterior wall (page 21).
13. Install wall sleeve, second downturn and direc-
tional elbows. Consult the job layout for the orientation of the elbows.
Mounting Holes Wall Opening*
Cambridge Engineering, Inc. 18 S-Series Technical Manual
TYPICAL VERTICAL OUTDOOR INSTALLATION
INTERIOR WALL FLASHING
(BY OTHERS)
EXTERIOR WALL FLASHING
(BY OTHERS)
DOWNTURN
UNIT
mWARNING:
The primary structural support
element of a vertically mounted
heater is the base. Any support to
the heater cabinet should be considered secondary, only as a means
to help stabilize the heater.
WALL SLEEVE
SECOND DOWNTURN
(OPTIONAL)
DIRECTIONAL
ELBOWS
GAS TRAIN WIRING
(FIELD CONNECTED)
GAS TRAIN ENCLOSURE
GAS TRAIN
ELECTRICAL CONTROL ENCLOSURE
BASE OF HEATER
INLET SKIRT
(FIELD ASSEMBLED)
MOUNTING DETAIL
DOWNTURN
FILTER SECTION
(OPTIONAL)
CHANNEL SUPPORT
(BY OTHERS)
SECURE STRUCTURAL CHANNEL
TO WALL (AS REQUIRED)
(BY OTHERS)
BUILDING WALL
BUILDING FOOTING
S-Series Technical Manual 19 Cambridge Engineering, Inc.
INSTALLATION INSTRUCTIONS
RAIN HOOD INLET SKIRT
1. Assemble the lower skirt section with the sheet
metal screws provided.
2. Assemble the upper skirt section with the sheet
metal screws provided.
3. Attach the upper skirt assembly to the lower skirt
assembly with the sheet metal screws provided.
4. Hang the upper skirt portion from the rear lip of
the rain hood and rotate forward into place. Secure
with the sheet metal screws provided.
5. Clamp the skirt extensions on the inside of the
inlet skirt (as shown) so that the skirt extension is
flush to the exterior wall. Secure the extension to
the rain hood with the sheet metal screws provided. Secure the extension to the building exterior
with hardware provided by others. (Typical both
sides.)
6. Caulk all seams with silicone caulk.
Cambridge Engineering, Inc. 20 S-Series Technical Manual
INSTALLATION INSTRUCTIONS
UNIT INLET SKIRT
1. Attach the front panel of the inlet skirt to the unit
top with the sheet metal screws provided.
2. Attach the side panels to the unit sides with the
sheet metal screws provided. (Typical both sides.)
3. Secure the front panel to the side panels with the
sheet metal screws provided through the clearance
holes in the front panel.
4. Clamp skirt on the inside of the side panel (as
shown) so that the skirt extension is flush to the
exterior wall. Secure the extension to the side
panel with the sheet metal screws provided.
Secure the extension to the building exterior with
hardware provided by others. (Typical both sides.)
5. Caulk all seams with silicone caulk.
S-Series Technical Manual 21 Cambridge Engineering, Inc.
INSTALLATION INSTRUCTIONS
GAS PIPING
IMPORTANT
Refer to the heater name plate for determining the minimum
gas supply pressure for obtaining the maximum gas capacity for which this heater is specified. Any field-installed
components including, but not limited to, meters, regulators, strainers and external gas trains must be installed
such that the minimum operating supply pressure for obtaining the maximum gas capacity is provided.
IMPORTANT
Units with external gas trains must be installed so that the
equivalent distance from the outlet of the gas train to the
inlet of the heater does not exceed 4 feet.
.1. Check with the local utility or gas supplier to determine
the gas supply pressure.
CAUTION:
If the gas supply pressure is in excess of the
maximum standing pressure indicated (14” WC, or 1
PSIG, or 2 PSIG, or 5 PSIG) on the heater nameplate,
a separate positive shutoff high pressure regulator must
be added upstream of the heater’s individual manual
shutoff valve. This regulator must be vented to the
outside of the building at least 10 feet from any intake
opening. The vent pipe should be designed to prevent
the entry of water, snow, insects or other foreign material that could cause blockage. There must be no reduc-
tion in size of the vent piping. Depending on the length
and the configuration of the vent piping the pipe size
may need to be increased. Refer to the applicable codes
for proper sizing.
2. Properly size the gas supply piping for the rated input
capacity, per local codes, and/or the National Fuel Gas
Code, NFPA 54/ANSI 223.1 or the CAN/CSA B149
Installation Codes.
3. Make sure the supply piping is free of foreign matter and
purged.
4. Verify that the gas piping, when installed, will not restrict or
block the unit access door from fully opening.
5. Install the gas piping to the unit in accordance with
local codes or, in their absence, in accordance with the
National Fuel Gas Code, NFPA 54, NFPA 54/ANSI
223.1 or the CAN/CSA B149 Installation Codes.
IMPORTANT
A 1/8" NPT tap is supplied with the heater for measuring
the gas supply pressure. If the gas supply pressure exceeds
that indicated on the nameplate, the installer must install a
1/8" NPT tap and high pressure manual shutoff valve upstream of the high gas pressure regulator.
mCAUTION:
An adequate sediment trap must be installed upstream
of all gas controls for the heater and as close to the gas
inlet connection of the heater as practical.
IMPORTANT
Many gas train components are equipped with Listed
Vent Limiters as atmospheric bleeds, however, local codes
may require that these vents and bleeds be vented to the
outdoors. If so, the vent piping should be designed to prevent the entry of water, snow, insects or other foreign materials that could cause blockage.
6. Apply test pressure to the supply piping system and
check for leaks. Use liquid gas detector.
mWARNING:
Do not use flame for leak checking.
mCAUTION:
If the test pressure is in excess of 1/2 PSIG
(3.45 KPA), the heater and its manual shutoff valve
must be disconnected from the gas supply system during pressure testing. Failure to comply will void warranty.
If the test pressure is less than or equal to 1/2 PSIG (3.5
KPA), the heater must be isolated from the gas supply piping
by closing its manual shutoff valve during pressure testing.
mWARNING:
Do not attempt to start unit at this time. Premature startup can result in damage to equipment and components.
Cambridge Engineering, Inc. 22 S-Series Technical Manual
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