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Cambridge Engineering Maxitrol M Series Technical Manual

Draw thru direct gas-fired make-up air heaters
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MAKE-UP AIR HEATERS
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
M-SERIES
DRAW THRU
DIRECT GAS-FIRED
TECHNICAL MANUAL
WARNING:
FOR YOUR SAFETY
ASHRAE
ASHRAE
90.1
COMPLIANT
COMPLIANT
®
®
M-TM1-1017
M110-M115 (3HP) REV. G
M115 (5HP) REV. H
M118-M136 REV. C
M140 REV. A

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Summary of Contents for Cambridge Engineering Maxitrol M Series

  • Page 1 M-SERIES DRAW THRU DIRECT GAS-FIRED MAKE-UP AIR HEATERS TECHNICAL MANUAL WARNING: 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 with the Terms and Conditions that are sent with every Order Acknowledgement. For questions regarding the Limited Warranty, contact Cambridge Engineering’s Customer Service Group at 1-800-473-4569 during the hours of 8:00 a.m. to 5:00 p.m. Central Time, Monday...

  • Page 3: Table Of Contents

    Individual Heater Component Descriptions ..............68 Damper Motor Replacement & Adjustment ..............72 Troubleshooting Guide....................75 ANSI/ASHRAE/IESNA Standard 90.1 ................81 Maintenance Log ......................82 Cambridge Engineering, Inc. 760 Long Road Crossing Dr. Chesterfield, MO. 63005 Copyright  2017 Phone: (636) 532-2233, (800) 899-1989 Cambridge Engineering, Inc.

  • Page 4: Hazard Summary

    If in doubt regarding installation or application, account, through standard engineering methods, the contact Cambridge Engineering Customer Service structure’s designed infiltration rate, by providing prop- Group at 800-473-4569 during the hours of 8:00 a.m.

  • Page 5: Typical System Overview

    Remote Control Station to prevent unwanted tampering of the temperature setting and the non-adjustable space sensor is mounted in the space being heated. M-Series Technical Manual Cambridge Engineering, Inc.

  • Page 6: Accessory Identification

    Inlet Collar Inlet Elbow Mounting Curb Motorized Discharge Damper Motorized Inlet Damper Mounting Legs Single Rainhood w/ Inlet Screen Vertical Mount Vertical Mount Outdoor Configuration Indoor Configuration UNIT FSID FLASHING & TRIM BY OTHERS FLOOR Cambridge Engineering, Inc. M-Series Technical Manual...

  • Page 7: Heater / Accessory Weights

    Discharge Duct - 20" Discharge Duct - 50" Discharge Duct - 72" Discharge Damper (internal) Discharge Elbow Discharge Plenum 3-way w/enclosure Discharge Diffuser Mounting Legs 3-foot, set of 4 Mounting Legs 5-foot, set of 4 M-Series Technical Manual Cambridge Engineering, Inc.

  • Page 8: Heater Operation

    HEATER CONFIGURATION BURNER VIEWPORT MANUAL SHUT-OFF VALVE SAFETY SHUT-OFF VALVE (SSV) SHUT-OFF VALVE (SOV) ELECTRICAL / GAS CONTROL ENCLOSURE MANUAL SHUT-OFF VALVE Cambridge Engineering, Inc. M-Series Technical Manual...

  • Page 9: Installation Instructions Uncrating Instructions

    WARNING: Where the mounting height of the heater is a con- sideration, work platforms or service lifts should be provided for accessibility to the equipment for service and maintenance activities. M-Series Technical Manual Cambridge Engineering, Inc.

  • Page 10: Horizontal Mount - Mounting Curb

    PITCH POCKETS OR ROOF BOOTS (BY OTHERS) RECOMMENDED. M136 37½" 88 3/8" 96" M140 Note: The V Bank Filter Section is an integral part of the M140 cabinet, thus it does not require a sepa- rate Mounting Stand/Rail. Cambridge Engineering, Inc. M-Series Technical Manual...

  • Page 11: Horizontal Mount - Roof Top Configuration

    IMPORTANT Accurate measurements are critical and will affect in- stallation process. 2. Assemble and secure the roof curb to the support structure per the recommendations of the structural engineer and roof manufacturer. M-Series Technical Manual Cambridge Engineering, Inc.
  • Page 12 M110 - M115 Typical Curb and Discharge Duct Typical Curb and Discharge Duct Roof Opening Model M110* 17¾" 17¾" M112* 19¼" 19¼" M115* 22¼" 22¼" * DIMENSIONS ALLOW FOR ¾" CLEARANCE ON EACH SIDE Cambridge Engineering, Inc. M-Series Technical Manual...
  • Page 13 CLEARANCE ON EACH SIDE This is an instrument of service and is the sole property WHERE USED: of Cambridge Engineering, Inc. It may not be copied, reproduced, or re-used on any other project without M-Series Technical Manual Cambridge Engineering, Inc.
  • Page 14 7-9 Wires Req'd (By Others) Discharge Plenum Hanger Bracket Typical Curb and Typical Curb and Discharge Duct Discharge Duct Roof Opening Model M140*** 55¼" 55¼" *** DIMENSIONS ALLOW FOR 1½" CLEARANCE ON EACH SIDE Cambridge Engineering, Inc. M-Series Technical Manual...

  • Page 15: Horizontal Mount - Outdoor Pad Mount Configuration

    INSTALLATION INSTRUCTIONS HORIZONTAL MOUNT - OUTDOOR PAD MOUNT CONFIGURATION IMPORTANT Cambridge Engineering recommends mounting the WARNING: heater a minimum of 24" off the mounting surface in Due to the size and weight of this equipment, it areas where snow accumulation could impact heater is recommended the heater support structure be operation.
  • Page 16 30½" 30½" M125*** 36" 36" M130**** 43" 43" M136**** 49" 49" *** DIMENSIONS ALLOW FOR 1½" CLEARANCE ON EACH SIDE **** DIMENSIONS ALLOW FOR 2" CLEARANCE ON EACH SIDE Typical Duct Interface Typical Curb Cambridge Engineering, Inc. M-Series Technical Manual...
  • Page 17 TYPICAL INSTALLATION HORIZONTAL MOUNT - OUTDOOR PAD MOUNT CONFIGURATION M140 Wall Opening Model M140**** 56¼" 56¼" **** DIMENSIONS ALLOW FOR 2" CLEARANCE ON EACH SIDE Typical Duct Interface TYPICAL CURB M-Series Technical Manual Cambridge Engineering, Inc.

  • Page 18: Horizontal Mount - Thru Wall Configuration

    Block the heater where neces- sary. Use a spreader bar to prevent damage and con- nect slings to the lifting brackets. IMPORTANT Cambridge Engineering recommends mounting the heater’s rainhood a minimum of 24" off the ground or other surfaces. Cambridge Engineering, Inc.
  • Page 19 TYPICAL INSTALLATION HORIZONTAL MOUNT - THRU WALL CONFIGURATION M110 - M115 Wall Opening Model M110** 32¼" 35" M112** 32¼" 35" M115** 46¼" 35" ** DIMENSIONS ALLOW FOR 1" CLEARANCE ON EACH SIDE M-Series Technical Manual Cambridge Engineering, Inc.
  • Page 20 55¼" M120*** 57¾" 55½" M125*** 69¾" 72¼" M130**** 92½" 73¼" M136**** 92½" 98¼" M140**** 121¾" 97¾" *** DIMENSIONS ALLOW FOR 1½" CLEARANCE ON EACH SIDE **** DIMENSIONS ALLOW FOR 2" CLEARANCE ON EACH SIDE Cambridge Engineering, Inc. M-Series Technical Manual...

  • Page 21: Vertical Mount - Outdoor Configuration

    IMPORTANT installing this equipment. Cambridge Engineering recommends mounting the heater a minimum of 60" off the mounting surface in areas where snow accumulation could impact the IMPORTANT heater operation.
  • Page 22 15. Adjust internal vibration isolation, if applicable, per 12. For M140 installations, see the field assembly draw- the setup instructions provided with this manual. ings provided with components. Cambridge Engineering, Inc. M-Series Technical Manual...
  • Page 23 Model M118*** 26½" 26½" M120*** 30½" 30½" M125*** 36" 36" M130**** 43" 43" M136**** 49" 49" *** DIMENSIONS ALLOW FOR 1½" CLEARANCE ON EACH SIDE **** DIMENSIONS ALLOW FOR 2" CLEARANCE ON EACH SIDE M-Series Technical Manual Cambridge Engineering, Inc.
  • Page 24 7-9 WIRES REQ'D (BY OTHERS) (BY OTHERS) INLET GAS PIPE HIGH PRESSURE SHUT-OFF VALVE HIGH PRESSURE SUPPLY TAP HIGH PRESSURE REGULATOR (HPR) (OPTION) INSULATION DISCHARGE DUCT DUCT OPENING COLLAR TEK SCREW OUTER PERIMETER UNIT ROOF Cambridge Engineering, Inc. M-Series Technical Manual...

  • Page 25: Vertical Mount - Indoor Configuration

    VERTICAL MOUNT - INDOOR CONFIGURATION IMPORTANT WARNING: Cambridge Engineering recommends mounting the Due to the size and weight of this equipment, it is heater’s rain hood a minimum of 60" off the ground or recommended the heater support be reviewed and...
  • Page 26 14. Adjust internal vibration isolation, if applicable, per 11. Install the discharge accessory by screwing the the setup instructions provided with this manual. accessory to the heater. Install hanging rods from the ceiling supports to the accessory̓s support brackets. Cambridge Engineering, Inc. M-Series Technical Manual...
  • Page 27 Model M118*** 51¾" 56" M120*** 57¾" 56" M125*** 69¾" 72½" M130**** 92½" 73½" M136**** 104" 83½" *** DIMENSIONS ALLOW FOR 1½" CLEARANCE ON EACH SIDE **** DIMENSIONS ALLOW FOR 2" CLEARANCE ON EACH SIDE M-Series Technical Manual Cambridge Engineering, Inc.

  • Page 28: Gas Piping

    KPA), the heater and its manual shut-off valve must tions must not penetrate the unit base or mounting be disconnected from the gas supply system during curb. Cambridge Engineering recommends using pressure testing. Failure to comply will void the pitch pockets or roof boots to seal the penetrations.

  • Page 29: Electrical

    Consult the design drawing or your local Cambridge Engineering Premature start-up can result in damage to the Representative for placement assistance. Do not equipment and components.

  • Page 30: Start-Up Instructions

    Verify the field wiring, both primary and (page 30) control, has been installed according to the 8. Gas Valve Leak Check Cambridge Engineering wiring diagram and (page 31) the National Electrical Code. 9. Gas Train Leak Check Verify that a sediment trap has been provided (page 32) upstream of other gas train components.
  • Page 31 (Note: The burner service switch must is needed and has not been installed, check with remain in the “OFF” position) your local Cambridge Engineering representative b. Check the pressure drop across the burner profile or Cambridge Engineering’s Customer Service...
  • Page 32 FLA. High amperage may indicate excessive blower to increase or decrease the pressure drops, as RPM. Call the Cambridge Engineering Customer required. Hold the adjusting nut and retighten Service Group at 800-473-4569 if unable to obtain ac- the jam nut to secure the mechanism.
  • Page 33 3-5 minutes. Turn the blower and burner switch- tapped fitting on the manual shut-off es to the "OFF" position. Access the high limit and valve located just prior to the burner for M-Series Technical Manual Cambridge Engineering, Inc.
  • Page 34 With the burner operating, spray the com- drive the modulating valve to minimum plete gas train with leak detector solution, fire. checking all pipe connections and plugs. Turn the blower and burner service “ ” switches to the position. Cambridge Engineering, Inc. M-Series Technical Manual...
  • Page 35 #3 on the signal conditioner ting. that was removed in Step 10.d.2 (See page 32). v. Remove the meter and reattach the red wire to terminal FP on the FSR board. M-Series Technical Manual Cambridge Engineering, Inc.
  • Page 36 Engineering Customer Service Group at 800-473-4569 cation. Refer to Individual Component during the hours of 8:00 a.m. to 5:00 p.m. Central Description Section for additional infor- Time, Monday through Friday. mation (page 66). Cambridge Engineering, Inc. M-Series Technical Manual...

  • Page 37: Operating Instructions

    11. Low Fire Start is de-energized after 15 seconds. 12. Unit runs and modulates until operating thermostat and/or interlock opens (heater shuts off). 13. Steps (2) through (12) repeat themselves automati- cally as necessary. M-Series Technical Manual Cambridge Engineering, Inc.

  • Page 38: 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 39 (-) 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. M-Series Technical Manual Cambridge Engineering, Inc.

  • Page 40: 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 41 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. M-Series Technical Manual Cambridge Engineering, Inc.
  • Page 42 "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. Cambridge Engineering, Inc. M-Series Technical Manual...
  • Page 43 TSS panel, will override the SETBACK tempera- ture setting and increase the space temperature to the HEAT ON and HEAT OFF temperature settings for the amount of time set on the OVERRIDE timer. M-Series Technical Manual Cambridge Engineering, Inc.
  • Page 44 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 Cambridge Engineering, Inc. M-Series Technical Manual...
  • Page 45 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. M-Series Technical Manual Cambridge Engineering, Inc.
  • Page 46 HED 7 SETBACK SCHEDULE/EXIT 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 Cambridge Engineering, Inc. M-Series Technical Manual...
  • Page 47 DOWN desired holiday start date. 6. Repeat steps 2-5 until all required holiday cycles have been entered. 7. Press the button to exit SETBACK SCHEDULE/EXIT the scheduling program. M-Series Technical Manual Cambridge Engineering, Inc.
  • Page 48 (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. Cambridge Engineering, Inc. M-Series Technical Manual...

  • Page 49: Maintenance Instructions

    M136- 9/16" 8 - 10 7 - 9½ M140 M140 50-60 9/16" 4 or M140 50-60 9/16" 9-11 8-10 M140 9/16" 10-12 9-11 8½ - M140 9/16" 8-10 10½ M-Series Technical Manual Cambridge Engineering, Inc.

  • Page 50: Reference

    20¾" M118* 21 7/8" 18¾" 23½" 23½" M120* 24½" 24¾" 27½" 27½" M125* 31¼" 31¼" 33" 33" M130* 36 5/8" 36 5/8" 39" 39" M136* 42½" 42¾" 45" 45" M140 50" 50" 52¼" 52¼" Cambridge Engineering, Inc. M-Series Technical Manual...

  • Page 51: Gas Train Drawings

    > 400 MBH Low Pressure ELECTRIC SHUT-OFF VALVE (SOV) CSA Certified ELECTRIC SAFETY SHUT-OFF VALVE (SSV) Horizontal Mount > 400 MBH High Pressure CSA Certified ELECTRIC SAFETY SHUT-OFF VALVE (SSV) ELECTRIC SHUT-OFF VALVE (SOV) M-Series Technical Manual Cambridge Engineering, Inc.
  • Page 52 In the extreme case, faulty valve operation will occur and the valve may fail to open or fully close. BURNER CLEANING The Cambridge Engineering burner is for the most part self-cleaning. However, if the application is extremely IMPORTANT dirty or dusty, it may become necessary to periodically It is not necessary to remove the valve from the gas clean the burner.
  • Page 53 7. Replace the valve bonnet and the bonnet screws (6). Torque the screws in a crisscross manner to 100 ± 10 in-lbs. Replace the solenoid and make the electrical hookup. M-Series Technical Manual Cambridge Engineering, Inc.
  • Page 54 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 Cambridge Engineering, Inc. M-Series Technical Manual...
  • Page 55 If soap is used, ensure that all soap is rinsed out of the filter. Visually inspect the filter to ensure that it is clean. Allow to dry before returning to service. M-Series Technical Manual Cambridge Engineering, Inc.
  • Page 56 * Continuous filters are manufactured in lengths of 24 panels. Cut filter panels like chain links. For example, 6 (2x3) means cut 2 rows x 3 panels long for total of 6 panels of this type. Cut only between filter panels. Cambridge Engineering, Inc. M-Series Technical Manual...

  • Page 57: Electrical Control Enclosure Isometric Drawing

    REFERENCE ELECTRICAL CONTROL ENCLOSURE ISOMETRIC DRAWING M110 - M115 M-Series Technical Manual Cambridge Engineering, Inc.
  • Page 58 REFERENCE ELECTRICAL CONTROL ENCLOSURE ISOMETRIC DRAWING M118 - M136 Cambridge Engineering, Inc. M-Series Technical Manual...
  • Page 59 ELECTRICAL CONTROL ENCLOSURE ISOMETRIC DRAWING M140 M-Series Technical Manual Cambridge Engineering, Inc.

  • Page 60: Electrical Wiring Diagrams

    Entering Air Thermostat Low Temperature Cutout Switch - SOV Leak Test Exhaust Fan Interlock Motor Multi-Tap Transformer (24&120 Volt) Motor Starter Class 2 Transformer (24 Volt) Flame Rod Flame Safeguard Relay Modulating Valve Temperature Sensor Cambridge Engineering, Inc. M-Series Technical Manual...
  • Page 61 Entering Air Thermostat Motor - Supply Fan Class 2 Transformer (24 Volt) Fire Protection Interlock Motor Starter - Supply Fan Temperature Sensor Flame Rod Motor Starter - Exhaust Fan Flame Safeguard Relay Modulating Valve M-Series Technical Manual Cambridge Engineering, Inc.
  • Page 62 Switch - SOV Leak Test Entering Air Thermostat Motor Multi-Tap Transformer (24&120 Volt) Flame Rod Motor Starter Class 2 Transformer (24 Volt) Flame Safeguard Relay Modulating Valve Temperature Sensor Fuse 24 Volt Control Overload Relay Cambridge Engineering, Inc. M-Series Technical Manual...
  • Page 63 Class 2 Transformer (24 Volt) Exhaust Fan Interlock Overload Relay Tamper Proof Space Sensor Flame Rod Temperature Sensor Flame Safeguard Relay Purge Timer R1A&R1B Relay Gas Valve Fuse 24 Volt Control Relay - Intermittent/Continuous Fuse 120 Volt Control M-Series Technical Manual Cambridge Engineering, Inc.
  • Page 64 Flame Safeguard Relay Overload Relay Class 2 Transformer (24 Volt) Fuse 24 Volt Control Purge Timer Tamper Proof Space Sensor Fuse 120 Volt Control R1A&R1B Relay - Gas Valve Temperature Sensor Temperature Setback System Cambridge Engineering, Inc. M-Series Technical Manual...
  • Page 65 Modulating Valve Tamper Proof Space Sensor Flame Safeguard Relay Profile Damper Adjustment Temperature Sensor Fuse 24 Volt Control Profile Damper Motor Variable Frequency Drive Fuse 120 Volt Control Purge Timer High Gas Pressure Switch M-Series Technical Manual Cambridge Engineering, Inc.

  • Page 66: Connection Diagram

    FOR MAXITROL SERIES 44 SYSTEMS AND SERIES 14 SYSTEMS WITH RHA CONTROL USE 2 WIRE SHIELDED TWISTED-PAIR 18 AWG MINIMUM RUN SEPARATE FROM ALL OTHER AC WIRING GROUND SHIELD AT REMOTE CONTROL STATION ONLY Cambridge Engineering, Inc. M-Series Technical Manual...

  • Page 67: Gas Control Systems

    Maxitrol 44 above) or operated intermittently based on a thermostat at maximum discharge temperature for space heating. Requires Maxitrol 44 controls and a signal to switch between modes (Exhaust Fan Interlock, Temperature Setback System, Manual Make-Up Air Switch, etc.) M-Series Technical Manual Cambridge Engineering, Inc.

  • Page 68: Remote Control Station Components

    Remote Control Station to indicate a clogged filter con- contact to automatically increase the discharge tempera- dition. Includes an adjustable pressure switch mounted in ture. the make-up air heater control enclosure to monitor the pressure drop across the filters. Cambridge Engineering, Inc. M-Series Technical Manual...
  • Page 69 An exhaust fan interlock is used to interlock the make- up air heater as a slave to an exhaust fan. Terminals are provided in the Remote Control Station for wiring of dry contacts (by others). M-Series Technical Manual Cambridge Engineering, Inc.

  • Page 70: Individual Heater Component Descriptions

    The disconnect must be off before accessing the electrical con- trol enclosure. Once the control enclo- sure is open, experienced service technicians may activate the electrical circuit to assist in troubleshooting. Cambridge Engineering, Inc. M-Series Technical Manual...
  • Page 71 The high gas pressure switch should be set at 25% above manifold gas pressure. The adjustment screw is located under the top plate. M-Series Technical Manual Cambridge Engineering, Inc.
  • Page 72 MR212 valve, the minimum fire adjusting screw is located under the large dust cover. The MR212 modulating valve also serves as the manifold pressure regulator to control the burner manifold pressure. The MR212 is rated for 5 PSIG. Cambridge Engineering, Inc. M-Series Technical Manual...
  • Page 73 In the “LOCAL” or “OFF” position, the service techni- cian has local control of the heater. These switches must be placed in the “REMOTE” position for normal control from the Remote Control Station. M-Series Technical Manual Cambridge Engineering, Inc.

  • Page 74: Damper Motor Replacement & Adjustment

    3/8" diameter clevis pin. Do not switch plunger being the twelve o’clock reference connect the damper linkage at this time. position. If it is beyond the four o’clock position, use Cambridge Engineering, Inc. M-Series Technical Manual...
  • Page 75 Do not over-drive the damper motor as damage to the PC board or tripping of the onboard fuse may result. If the fuse trips, place the blower service switch in the “OFF” position for 15 seconds to allow fuse to reset. M-Series Technical Manual Cambridge Engineering, Inc.
  • Page 76 CSA Certified ELECTRIC SHUT-OFF VALVE (SOV) ELECTRIC SAFETY SHUT-OFF VALVE (SSV) Horizontal Mount > 400 MBH XL GAPS Compliant formerly Industrial Risk Insurers (IRI) CSA Certified ELECTRIC SAFETY SHUT-OFF VALVE (SSV) ELECTRIC SHUT-OFF VALVE (SOV) Cambridge Engineering, Inc. M-Series Technical Manual...

  • Page 77: Troubleshooting Guide

    13. Blower Damage 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. M-Series Technical Manual Cambridge Engineering, Inc.
  • Page 78 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. Cambridge Engineering, Inc. M-Series Technical Manual...
  • Page 79 Defective FSR a) Replace FSR. 3. Operating Thermostat a) Differential temperature setting too tight a) Increase differential temperature setting. 4. Damper Motor End Switch a) End switch making intermittent contact a) Replace end switch assembly. M-Series Technical Manual Cambridge Engineering, Inc.
  • Page 80 Replace the sensor if the resistance mea- sured is more than: 7,000 Ω for the T244; 5,500 Ω for the TS244; or 2,250 Ω for the TD244. b) Induced voltage in field wiring b) Utilize shielded, twisted pair wiring. c) Space sensor located improperly c) Sensor in cold draft - relocate Cambridge Engineering, Inc. M-Series Technical Manual...
  • Page 81 Replace the sensor if the resistance mea- sured at: terminals 1 and 2 on TS114 is less than 8,000 Ω; terminals 1 and 3 or 2 and 3 on TS144 is less than 2,900 Ω. b) Temperature control system out of cali- b) Perform temperature control system cali- bration bration. M-Series Technical Manual Cambridge Engineering, Inc.
  • Page 82 3. Space Temperature Selector (T244A or TS244A/TD244A) a) Induced voltage in field wiring a) Utilize shielded, twisted pair wiring. 4. Remote Heat Adjust (TD114) a) Induced voltage in field wiring a) Utilize shielded, twisted pair wiring. Cambridge Engineering, Inc. M-Series Technical Manual...

  • Page 83: Ansi/Ashrae/Iesna Standard 90.1

    However sions of this standard do not apply to single family Cambridge Engineering certifies that its equip- houses, low rise residential buildings and buildings ment has a 100% combustion efficiency (Ec) and (or portions of buildings) that use energy primarily a 92% thermal efficiency (Et).

  • Page 84: Maintenance Log

    MAINTENANCE LOG M O D E L N O . S E R I A L N O . Date Activity Technician Cambridge Engineering, Inc. M-Series Technical Manual...
  • Page 85 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 86 760 Long Road Crossing Dr., Chesterfield, MO 63005 Phone: (636) 532-2233 (800) 899-1989, Fax: (636) 530-6133 www.cambridge-eng.com...

This manual is also suitable for:

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