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INDUSTRIAL BLOW-THRU
Improper installation, adjustment, alteration, service or maintenance can cause property dam-
age, injury or death. Read the installation, operating, and maintenance instructions thoroughly
before installing or servicing this equipment.
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
S-SERIES
DIRECT GAS-FIRED
TECHNICAL MANUAL
mWARNING:
FOR YOUR SAFETY
SPACE HEATER
®
®
ASHRAE
ASHRAE
90.1
COMPLIANT
COMPLIANT
®
S-TM7-02-18
S400-S3200 REV. F
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Table of Contents
Summary of Contents for Cambridge Engineering S Series
- Page 1 S-SERIES DIRECT GAS-FIRED INDUSTRIAL BLOW-THRU SPACE HEATER ® TECHNICAL MANUAL mWARNING: Improper installation, adjustment, alteration, service or maintenance can cause property dam- age, 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.
- Page 2 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.
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Page 3: Table Of Contents
Electrical Wiring Diagrams ..................57 Electrical Connection Diagram ..................62 Gas Train Drawings ......................63 Individual Component Descriptions ................67 ANSI/ASHRAE/IESNA Standard 90.1 ................73 Cambridge Engineering, Inc. 760 Long Road Crossing Dr. Chesterfield, MO. 63005 Phone: (636) 532-2233, (800) 899-1989 Copyright 2018 Fax: (636) 530-6133 Cambridge Engineering, Inc. -
Page 4: Hazard Summary
(e.g. when the heater is providing the make-up air Central Time, Monday through Friday. to a boiler room), the unit is to be interlocked to open inlet air dampers or other such devices. Cambridge Engineering, Inc. S-Series Technical Manual... -
Page 5: Typical System Overview
Discharge Duct Directional Elbows Downturn Filter Section Inlet Duct UNIT Inlet Elbow Inlet Plenum RH-TW Inlet Skirt-Rain Hood Inlet Skirt-Unit Mounting Curb Motorized Discharge Damper Mounting Rail RH-RT Rain Hood-Roof Top RH-TW Rain Hood-Thru Wall S-Series Technical Manual Cambridge Engineering, Inc. -
Page 6: Heater Operation
DAMPER BLADES 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 REGULATOR MANUAL SHUT-OFF VALVE BURNER VIEWPORT Cambridge Engineering, Inc. S-Series Technical Manual... -
Page 7: Installation Instructions
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. S-Series Technical Manual Cambridge Engineering, Inc. -
Page 8: Roof Top Mounting - Curb / Stand / Rail
CURB SECTION 2 X 6 TREATED LUMBER FLASHING 2 x 2 WOOD NAILER (PROVIDED) INSULATION Model S400/S800 65½" 33¼" 25 3/8" S950/S1200/S1600 78 5/8" 33¼" 42" S1850/S2200/S3200 90¼" 36¼" 47 1/8" 2.5" 1 5/8" Cambridge Engineering, Inc. S-Series Technical Manual... -
Page 9: Roof Top / Thru Wall Mounting - Stand / Rail
2 X 6 TREATED LUMBER S950/S1200/S1600 69 7/8" 33¼" 42" S1850/S2200/S3200 75¾" 36¾ " 47 1/8" UNDER ROOF MOUNTING - CURB CURB SECTION CURB 24" REF. 2 x 2 WOOD NAILER (PROVIDED) INSULATION 2.5" 1 5/8" ROOF INSULATION S-Series Technical Manual Cambridge Engineering, Inc. -
Page 10: Roof Top Mounting
Roof Opening* Model Weight S400/S800 550 lbs. 13" 24¾" S950/S1200/S1600 800 lbs. 15" 41½" S1850/S2200/S3200 1500 lbs. 24¼" 46½" * Dimensions allow for ¾" clearance on each side Cambridge Engineering, Inc. S-Series Technical Manual... - Page 11 TREATED LUMBER TREATED LUMBER OPENING (BY OTHERS) (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) S-Series Technical Manual Cambridge Engineering, Inc.
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Page 12: Thru Wall Mounting
3/8" dia. 69 7/8" 33¼" 43 7/8" 29" 42¼" S1850/S2200/S3200 1500 lbs. 4 (6*) 1/2" dia. 75¾" 36¾" 48 7/8" 38¾" 47¼" *For optional filter section ** Dimensions allow for 1" clearance on each side Cambridge Engineering, Inc. S-Series Technical Manual... - Page 13 HANGING ROD WASHER WASHER WASHER DOUBLE LOCK NUTS WASHER DOUBLE LOCK NUTS SHIPPING POSITION HANGING RODS, NUTS AND WASHERS BY OTHERS L BRACKET C BRACKET FOR S400 - S800 UNITS FOR S950 - S3200 UNITS S-Series Technical Manual Cambridge Engineering, Inc.
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Page 14: Roof Top / Thru Wall Mounting
Wall Opening* Model Weight S400/S800 550 lbs. 16" 28¼" S950/S1200/S1600 800 lbs. 18" 45" S1850/S2200/S3200 1500 lbs. 27½" 50" * Dimensions allow for 1½" clearance on each side Cambridge Engineering, Inc. S-Series Technical Manual... - Page 15 EXTERNAL GAS TRAIN WITH ENCLOSURE (APPLICABLE TO SOME FM AND XL GAPS OPTIONS) STAND DETAIL 2 X 6 TREATED LUMBER 10½" (BY OTHERS) 12" 2 X 4 TREATED LUMBER (PROVIDED) TREATED LUMBER (BY OTHERS) S-Series Technical Manual Cambridge Engineering, Inc.
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Page 16: Under Roof Mounting
3/8" dia. 69 7/8" 33¼" 43 7/8" 30" 41¼" S1850/S2200/S3200 1500 lbs. 4 (6*) 1/2" dia. 75¾" 36¾" 48 7/8" 37¼" 46¾" *For optional filter section ** Dimensions allow for ¾" clearance on each side Cambridge Engineering, Inc. S-Series Technical Manual... - Page 17 HANGING ROD WASHER WASHER DOUBLE LOCK NUTS WASHER DOUBLE LOCK NUTS SHIPPING POSITION HANGING RODS, NUTS AND WASHERS BY OTHERS L BRACKET C BRACKET FOR S400 - S800 UNITS FOR S950 - S3200 UNITS S-Series Technical Manual Cambridge Engineering, Inc.
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Page 18: Vertical Indoor Mounting
27 7/8" 26" 25½" S950/S1200/S1600 950 lbs. 3/8" dia. 26" 43 7/8" 29" 42¼" S1850/S2200/S3200 1750 lbs. 1/2" dia. 34 7/8" 48 7/8" 38¾" 47¼" * Dimensions allow for 1" clearance on each side Cambridge Engineering, Inc. S-Series Technical Manual... - Page 19 SHIPPING POSITION HANGING ROD HANGING ROD WASHER WASHER WASHER WASHER DOUBLE LOCK NUTS DOUBLE LOCK NUTS MOUNTING POSITION MOUNTING POSITION C BRACKET L BRACKET FOR S950 - S3200 UNITS FOR S400 - S800 UNITS S-Series Technical Manual Cambridge Engineering, Inc.
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Page 20: Vertical Outdoor Mounting
57 7/8" 33¼" 27 7/8" 16" 25¼" S950/S1200/S1600 750 lbs. 69 7/8" 33¼" 43 7/8" 18" 42½" S1850/S2200/S3200 1500 lbs. 75¾" 36¾" 48 7/8" 27½" 47¾" * Dimensions allow for 1½" clearance on each side Cambridge Engineering, Inc. S-Series Technical Manual... - Page 21 BASE OF HEATER FILTER SECTION (OPTIONAL) INLET SKIRT (FIELD ASSEMBLED) CHANNEL SUPPORT (BY OTHERS) MOUNTING DETAIL SECURE STRUCTURAL CHANNEL TO WALL (AS REQUIRED) (BY OTHERS) DOWNTURN BUILDING WALL BUILDING FOOTING S-Series Technical Manual Cambridge Engineering, Inc.
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Page 22: Rain Hood Inlet Skirt
4. Hang the upper skirt portion from the rear lip of 6. Caulk all seams with silicone caulk. the rain hood and rotate forward into place. Secure with the sheet metal screws provided. Cambridge Engineering, Inc. S-Series Technical Manual... -
Page 23: Unit Inlet Skirt
3. Secure the front panel to the side panels with the hardware provided by others. (Typical both sides.) sheet metal screws provided through the clearance 5. Caulk all seams with silicone caulk. holes in the front panel. S-Series Technical Manual Cambridge Engineering, Inc. -
Page 24: Gas Piping
1/8" NPT tap and high pressure manual shutoff valve up- Do not attempt to start unit at this time. Premature start- stream of the high gas pressure regulator. up can result in damage to equipment and components. Cambridge Engineering, Inc. S-Series Technical Manual... -
Page 25: Electrical Wiring
In this application, the sen- Premature start-up can result in damage to sor should be located on the first column in from the equipment and components. outside wall when feasible. S-Series Technical Manual Cambridge Engineering, Inc. -
Page 26: Start-Up Instructions
Do not proceed with start-up unless the gas supply instructions will void the warranty. pressure agrees with nameplate pressure require- ments. If the gas supply pressure is in excess of the maximum pressure indicated, a separate positive Cambridge Engineering, Inc. S-Series Technical Manual... - Page 27 If a high pressure regulator is needed and has not been installed, check with your c. Turn the blower service switch to the “OFF” posi- local agent or Cambridge Engineering’s Customer tion. Service Group at 1-800-473-4569 to determine the size and capacity requirements.
- Page 28 Reconnect the wire to terminal #8 on the amplifier. sistent ignition at minimum fire and locking in the flame safeguard relay. Do not allow the flame signal j. When performing a start-up proceed to the next to drop below 2.0 microamps DC. Cambridge Engineering, Inc. S-Series Technical Manual...
- Page 29 130°F. On heaters with dual temperature Do not allow leak detector solution to come in contact with electrical components. selection dials on the face of the control, set the Space Heat dial to 160°F. S-Series Technical Manual Cambridge Engineering, Inc.
- Page 30 All safety controls must be returned to normal valve in the gas train, connect the manometer to the operating conditions. leak test port between the valves and wait 30 sec- onds to read the manometer. If the reading is greater Cambridge Engineering, Inc. S-Series Technical Manual...
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Page 31: Calibration Procedures
I f another interlock device controls the operation of counterclockwise. the heater, activate this device. d. After the motorized discharge damper opens, the blower motor will start. e. After a delay for pre-purge and igniter warmup, the burner will ignite. S-Series Technical Manual Cambridge Engineering, Inc. - Page 32 3 of the Remote Heat Adjustment (RHA) in tion and allow the Discharge Air Temperature the remote control station. Sampling Box time to cool. 3. Remove the RHA from the remote control station. Cambridge Engineering, Inc. S-Series Technical Manual...
- Page 33 14. Turn the burner and blower service switches to the “OFF” position. Remove the jumper from terminals 2 and 3 of the RHA if one was added during step 5. S-Series Technical Manual Cambridge Engineering, Inc.
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Page 34: Operating Instructions
11. Low Fire Start is de-energized after 15 seconds. 12. Unit runs and modulates until operating thermo- stat and/or interlock opens (heater shuts off). 13. Steps (2) through (12) repeat themselves auto- matically as necessary. Cambridge Engineering, Inc. S-Series Technical Manual... -
Page 35: Electronic Thermostat
OPERATING INSTRUCTIONS ELECTRONIC THERMOSTAT The Cambridge Engineering Operating Electronic Thermostat (OET) controls the heater’s ON/OFF operation in a space heating mode. It includes the following features: • Digital LED display of current temperature and temperature settings. • LED indication of status of output relay. - Page 36 (-) the measured temperature. 2. Press and hold the button while pressing HEAT OFF or the button until the desired tempera- DOWN ture for the heater to turn OFF is displayed. Cambridge Engineering, Inc. S-Series Technical Manual...
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Page 37: Tss Controller
OPERATING INSTRUCTIONS TSS CONTROLLER The Cambridge Engineering TSS Controller provides several features to tailor the operation of the Cambridge heating system to particular applications. • Seven day programmable clock. • Separate temperature settings for Heating and Setback operation. • Separate schedules for Summer Ventilation and Heating modes. - Page 38 SETTING AUTOMATIC ADJUSTMENT FOR DAYLIGHT SAVING TIME The TSS Controller has the ability to automatically detect and adjust for daylight saving time. The default setting on the controller is to recognize daylight saving time. Cambridge Engineering, Inc. S-Series Technical Manual...
- Page 39 "YES" if daylight DOWN saving time should be recognized or "NO" if daylight saving time is not recognized. 4. Press the button to exit SETBACK SCHEDULE/EXIT the scheduling program. S-Series Technical Manual Cambridge Engineering, Inc.
- Page 40 Setting this timer, located on the front "--:--" is displayed (between 11.59PM and 12.00AM for of the TSS panel, will override the SETBACK tempera- time settings; between 12.31 and 1.01 for date settings). Cambridge Engineering, Inc. S-Series Technical Manual...
- Page 41 Off 10 On 11 On 11 Off 11 Off 11 On 12 On 12 Off 12 Off 12 On 13 On 13 Off 13 Off 13 On 14 On 14 Off 14 Off 14 S-Series Technical Manual Cambridge Engineering, Inc.
- Page 42 ON time. DOWN 9. Press and bold the button while DAY OF WEEK pressing the or the button until the light DOWN for the desired day is illuminated. Cambridge Engineering, Inc. S-Series Technical Manual...
- Page 43 SETBACK SCHEDULE/EXIT HED 7 the scheduling program. HSD 8 HED 8 15. Verify that the correct current time and light for day HSD 9 of the week are still displayed. HED 9 S-Series Technical Manual Cambridge Engineering, Inc.
- Page 44 DOWN 6. Repeat steps 2-5 until all required holiday cycles have desired holiday start date. been entered. 7. Press the button to exit SETBACK SCHEDULE/EXIT the scheduling program. Cambridge Engineering, Inc. S-Series Technical Manual...
- Page 45 (A period [.] after the F will indicate the Calibration Mode). 2. Pressing the or the button will display the DOWN current calibration difference above or below (-) the measured temperature. S-Series Technical Manual Cambridge Engineering, Inc.
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Page 46: Maintenance Instructions
Severe Service Model Quantity Size (High ambient, dirty or 6 months S400/S800 20" x 25" x 2" moist location, high vibra- tion) S950/S1200/S1600 20" x 25" x 2" S1850/S2200/S3200 16" x 25" x 2" Cambridge Engineering, Inc. S-Series Technical Manual... - Page 47 BELT TENSIONING BURNER CLEANING The Cambridge Engineering burner is for the most Using a Browning Belt Tension Checker and a part self-cleaning. However, if the application is straight edge, verify proper belt tension according to extremely dirty or dusty, it may become necessary to the following table: periodically clean the burner.
- Page 48 (open) position. Cambridge Engineering, Inc. S-Series Technical Manual...
- Page 49 BONNET SCREW VALVE BONNET CORE/DIAPHRAGM SUBASSEMBLY BLEED HOLE Locate bleed hole in core/diaphragm sub--- BODY GASKET assembly approximately 30° from valve inlet CAUTION Do not damage valve seat VALVE BODY Disassembled View of ASCO Valve S-Series Technical Manual Cambridge Engineering, Inc.
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Page 50: Troubleshooting Instructions
13. Blower a) Defective or locked bearings a) Replace bearings. b) Physical damage b) Replace or repair blower 14. Belts a) Belt Slipping a) Tighten belts. b) Belt broken or missing b) Replace belts. Cambridge Engineering, Inc. S-Series Technical Manual... - Page 51 6. Multi-Functional PC Board a) Low fire start set too low a) Adjust modulating valve voltage between 10 and 13 Volts DC. b) Thermistor open or not connected b) Properly install or replace thermistor. S-Series Technical Manual Cambridge Engineering, Inc.
- Page 52 Increase differential temperature setting. b) Open or short in thermistor circuit b) Check wiring or replace thermistor. 4. Damper Motor End Switch a) End switch making intermittent contact a) Replace end switch assembly. Cambridge Engineering, Inc. S-Series Technical Manual...
- Page 53 15,000 Ω 1 and 3 or 2 and 3 on TS144 exceeds 6,000 Ω. c) Correct wiring terminations. c) Sensor cross-wired to amplifier d) Perform appropriate calibration procedure d) Temperature Control System out of cali- (pages 29-31). bration S-Series Technical Manual Cambridge Engineering, Inc.
- Page 54 1 and 2 on TS114J is less than 8,000 Ω; terminals 1 and 3 or 2 and 3 on TS144 is less than 2,900 Ω. b) Perform temperature control system b) Temperature control system out of calibration calibration. Cambridge Engineering, Inc. S-Series Technical Manual...
- Page 55 (T244 or TS244/TD244) a) Induced voltage in field wiring a) Utilize shielded, twisted pair wiring. 4. Remote Heat Adjust (TD114 or CEI 4175-0-960) a) Induced voltage in field wiring a) Utilize shielded, twisted pair wiring. S-Series Technical Manual Cambridge Engineering, Inc.
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Page 56: Damper Motor Replacement & Adjustment
(This is to avoid a “Call-for-Fan” few clicks, as required, to obtain the correct starting signal from the remote control station during the position. (Refer to Figure 1.) next two steps). Cambridge Engineering, Inc. S-Series Technical Manual... - Page 57 16. Using a deep-well, 1/2" hex socket or nut driver, turn the upper cam hex nut clockwise in one click increments until the damper linkage tube rests against the hex shaft. (Refer to Figure 3. ) S-Series Technical Manual Cambridge Engineering, Inc.
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Page 58: Reference
REFERENCE ELECTRICAL CONTROL ENCLOSURE ISOMETRIC DRAWING Cambridge Engineering, Inc. S-Series Technical Manual... -
Page 59: Electrical Wiring Diagrams
Low Temperature Cutout Switch - Fan/Off/Heat Entering Air Thermostat Motor Multi-Tap Transformer (24 & 120 Volt) Motor Starter Flame Rod Class 2 Transformer (24 Volt) Modulating Valve Flame Safeguard Relay Temperature Sensor - LTC/EAT S-Series Technical Manual Cambridge Engineering, Inc. - Page 60 Discharge Temperature Sensor Switch - Fan/Off/Heat Motor Entering Air Thermostat Switch - SOV Leak Test Modulating Valve Flame Rod Multi-Tap Transformer (24 & 120 Volt) Motor Starter Flame Safeguard Relay Class 2 Transformer (24 Volt) Cambridge Engineering, Inc. S-Series Technical Manual...
- Page 61 Switch - Fan/Off/Heat Motor Starter Flame Rod Switch - SOV Leak Test Modulating Valve Flame Safeguard Relay Multi-Tap Transformer (24 & 120 Volt) Overload Relay Fuse 24 Volt Control Class 2 Transformer (24 Volt) S-Series Technical Manual Cambridge Engineering, Inc.
- Page 62 Flame Rod Multi-Tap Transformer (24 & 120 Volt) Overload Relay Flame Safeguard Relay Class 2 Transformer (24 Volt) Override Timer Switch Fuse 24 Volt Control Tamperproof Sensor Calibration Resistor Fuse 120 Volt Control Programmable Thermostat/Timer Cambridge Engineering, Inc. S-Series Technical Manual...
- Page 63 Switch - SOV Leak Test Motor Starter Flame Rod Multi-Tap Transformer (24 & 120 Volt) Modulating Valve Flame Safeguard Relay Class 2 Transformer (24 Volt) Overload Relay Fuse 24 Volt Control Temperature Sensor - LTC/EAT S-Series Technical Manual Cambridge Engineering, Inc.
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Page 64: Electrical Connection Diagram
REFERENCE ELECTRICAL CONNECTION DIAGRAM Cambridge Engineering, Inc. S-Series Technical Manual... -
Page 65: Gas Train Drawings
MANOMETER TAP FOR UNIT SUPPLY PRESSURE READING CSA Certified HAND SHUT-OFF VALVE Certified by CSA International to comply with ANSI Standard Z83.4/CSA3.7 Complies with Factory Mutual insurance requirements Complies with XL Insurance Global Asset Protection Services requirements S-Series Technical Manual Cambridge Engineering, Inc. - Page 66 Filter Section MANOMETER TAP FOR UNIT SUPPLY PRESSURE READING High Pressure HAND SHUT-OFF VALVE CSA Certified FM Compliant Certified by CSA International to comply with ANSI Standard Z83.4/CSA3.7 Complies with Factory Mutual insurance requirements Cambridge Engineering, Inc. S-Series Technical Manual...
- Page 67 ELECTRIC SHUT-OFF VALVE W/ VISUAL INDICATOR (SOV) CSA Certified EXTERNAL GAS TRAIN ENCLOSURE FM Compliant (ROOF SUPPORT BY OTHERS) Certified by CSA International to comply with ANSI Standard Z83.4/CSA3.7 Complies with Factory Mutual insurance requirements S-Series Technical Manual Cambridge Engineering, Inc.
- Page 68 High Pressure HAND SHUT-OFF VALVE CSA Certified XL GAPS Compliant Certified by CSA International to comply with ANSI Standard Z83.4/CSA3.7 Complies with Factory Mutual insurance requirements Complies with XL Insurance Global Asset Protection Services requirements Cambridge Engineering, Inc. S-Series Technical Manual...
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Page 69: Individual Component Descriptions
See the operating and programming a series/parallel combination in order to instructions for the TSS Controller (page 35). simulate a single thermistor response. S-Series Technical Manual Cambridge Engineering, Inc. - Page 70 ELECTRONIC DISCHARGE-LOCAL (EDL) system utilizes Maxitrol’s Series The EDL temperature control system 44 modulation controls. The Space utilizes Maxitrol’s Series 14 modula- Temperature Selector (STS) is set tion controls. The discharge tempera- to the desired space temperature ture sensor, which is mounted in the...
- Page 71 (DTS). plate. The low gas pressure switch will have to be reset This box should not be tampered with whenever gas supply has been interrupted. unless performing the Calibration Procedures (pages 29-31). S-Series Technical Manual Cambridge Engineering, Inc.
- Page 72 105˚F or 120 to 160˚F. A jumper or switch contact gas pressure to build on the seat of is required across terminals 20 and 22 to activate the the SSV safety shut-off gas valve. higher temperature selection. Cambridge Engineering, Inc. S-Series Technical Manual...
- Page 73 55˚F) in the ventilation mode; or (b) the gas valve before attempting to secure the enclosure door. fails to remain energized during a heating cycle. 3) The EAT (Entering Air Thermostat) circuit func- tions automatically to turn off the burner when the out- S-Series Technical Manual Cambridge Engineering, Inc.
- Page 74 150 VA 24 Volt; FNM-1.6 for 150 VA 115 Volt; and FNM-2.25 for 200 VA 115 Volt. Consult the heater wir- ing diagram to identify the proper fusing. Do not increase the fuse rating over that which is specified. Cambridge Engineering, Inc. S-Series Technical Manual...
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Page 75: Ansi/Ashrae/Iesna Standard 90.1
DDC system with the neces- sary programming for zone control, automatic shutdown, setback and optimum start can also meet the standard. Units intended to operate continuously - No spe- cial controls are required to meet the standard. S-Series Technical Manual Cambridge Engineering, Inc. -
Page 76: Cambridge Engineering, Inc
MAINTENANCE LOG M O D E L N O . S E R I A L N O . Date Activity Technician Cambridge Engineering, Inc. S-Series Technical Manual... -
Page 77: Cambridge Engineering, Inc
SCAN THIS CODE TO ACCESS OUR "HOW-TO" SERVICE VIDEOS ONLINE. https://www.cambridge-eng.com/parts-service/how-to-service-videos Cambridge Engineering, Inc. reserves the right to change specifications, modify the design and/or substitute equivalent materials without notice as the result of code requirements, product enhancements, ongoing research/development and vendor changes beyond our control. - Page 78 760 Long Road Crossing Dr., Chesterfield, MO 63005 Phone: (636) 532-2233 (800) 899-1989, Fax: (636) 530-6133 www.cambridge-eng.com...