Cambridge Air Solutions SPEC AIR Series Technical Manual
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Cambridge Air Solutions SPEC AIR Series Technical Manual

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SPEC AIR SERIES
TECHNICAL MANUAL
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.
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
DRAW THRU
DIRECT GAS-FIRED
VENTILATION UNIT
WARNING:
FOR YOUR SAFETY
ASHRAE
ASHRAE
90.1
COMPLIANT
COMPLIANT
®
SPEC AIR -TM1-0122

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Summary of Contents for Cambridge Air Solutions SPEC AIR Series

  • Page 1 SPEC AIR SERIES DRAW THRU DIRECT GAS-FIRED VENTILATION UNIT TECHNICAL MANUAL WARNING: 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.
  • Page 2 LIMITED WARRANTY Cambridge Air Solutions Limited Warranty is included within the Terms and Conditions that are sent with every Order Acknowledgement. For questions regarding Limited Warranty, contact Cambridge Air Solutions Customer Service Group at 1-800-473-4569. Cambridge Air Solutions 760 Long Road Crossing Dr.

  • Page 3: Table Of Contents

    SPEC AIR SERIES TECHNICAL MANUAL CONTENTS HAZARD SUMMARY ............................3 TYPICAL SYSTEM OVERVIEW ........................4 Accessory Identification.........................5 Unit/Accessory Weights ........................5 Unit Operation .............................6 Unit Configuration .............................6 INSTALLATION INSTRUCTIONS Uncrating Instructions ..........................7 Mounting Location ............................7 Horizontal Mount – Mounting Curb ....................8 Horizontal Mount – Roof Top Preparation..................9 Gas Piping ..............................11...
  • Page 4 Gas Control Systems ..........................44 Remote Control Station Components ..................45 Individual Unit Component Descriptions ...................46 Damper Motor Replacement & Adjustment ................51 Troubleshooting Guide ........................52 ANSI/ASHRAE/IESNA STANDARD 90.1 ....................57 MAINTENANCE LOG ............................58 QR CODE ................................59 Cambridge Air Solutions. Spec Air Series Technical Manual...

  • Page 5: Hazard Summary

    If in doubt regarding installation or application, equipment. Use extreme caution and observe contact Cambridge Air Solutions Customer Service safety regulations at all times. Obey applicable Group at 800-473-4569 during the hours of 8:00 a.m.

  • Page 6: Typical System Overview

    The adjustable portion of the temperature selector is typically mounted in the Remote Control Station to prevent unwanted tampering of the temperature setting and the non-adjustable space sensor is mounted in the space being heated. Cambridge Air Solutions. Spec Air Series Technical Manual...

  • Page 7: Accessory Identification

    V-Bank Filter Section Discharge Duct - 50" Discharge Nozzles Discharge Damper Curb 14" 3HP motor 5HP motor 7.5HP motor 10HP motor 15HP motor 20HP motor 25HP motor 1. Primary drive motor not included Spec Air Series Technical Manual Cambridge Air Solutions...

  • Page 8: Unit Operation

    MODULATING GAS VALVE /REGULATOR SAFETY SHUT-OFF VALVE (SSV) DAMPER MOTOR ACCESS (IF DISCHARGE DAMPER SELECTED) LEAK TEST PORT SHUT-OFF VALVE (SOV) ELECTRICAL / GAS CONTROL ENCLOSURE ACCESS DOOR (BOTH SIDES) MANUAL SHUT-OFF VALVE Cambridge Air Solutions. Spec Air Series Technical Manual...

  • Page 9: Installation Instructions

    Spec Air Series Technical Manual Cambridge Air Solutions...

  • Page 10: Horizontal Mount - Mounting Curb

    (BY OTHERS) UNIT BASE 7/8" TYP 14" RAIL CROSS SECTION INSULATION & CANT (BY OTHERS) 3" Model Reference (inch) 33" 33" 33" 33 7/8" 48 5/8" 54 5/8" 66 5/8" 88 3/8" Cambridge Air Solutions. Spec Air Series Technical Manual...

  • Page 11: Horizontal Mount - Roof Top Preparation

    A. Secure mounting stands to rail wood nailer with wood lag screws and add waterproof IMPORTANT sealant. The Spec Air Series product line is suitable for horizontal mount - roof top configurations only. B. Mounting stand construction: 12 Ga. galvanized steel. Required for filter section Prepare the roof for installation.
  • Page 12 Use a clear or gray HIGH PRESSURE REGULATOR ASSEMBLY (HPR) silicone caulking to prevent water leaks. TYP, IF REQUIRED 5. Seal all roof penetrations to prevent roof leaks. Cambridge Air Solutions. Spec Air Series Technical Manual...

  • Page 13: Gas Piping

    Do not attempt to start the unit at this time. matter and purged. Premature start-up can result in damage to the equipment and components. 4. Verify that the gas piping, when installed, will Spec Air Series Technical Manual Cambridge Air Solutions...

  • Page 14: Electrical

    Group at 800-473-4569. 5. Wire the Remote Control Station and other temperature control options using Class 2 wiring WARNING: per Cambridge Air Solutions wiring diagram For roof mounting, the gas and electrical and National Electrical Code Article 725 or local codes.

  • Page 15: Start-Up Instructions

    Verify the field wiring, both primary and (page 15) control, has been installed according to the 8. Gas Valve Leak Check Cambridge Air Solutions wiring diagram and (page 16) the National Electrical Code. 9. Gas Train Leak Check (page 17) f.
  • Page 16 (not local Cambridge Air Solutions representative provided). The pressure drop across the or Cambridge Air Solutions’ Customer Service burner profile plate shall be 0.68" WC for units Group at 800-473-4569 to determine the size without filters and 0.72" WC for units with and capacity requirements that are required.
  • Page 17 7. CALCULATING AND ADJUSTING BURNER MANIFOLD PRESSURE IMPORTANT Call the Cambridge Air Solutions Customer Service Group at 800-473-4569 if unable to obtain the required pressure drop across the burner profile plate. a. Turn the disconnect switch off.
  • Page 18 The pressure drop across the burner profile damper that was adjusted in Step 5 (page 14) must not fall below 0.51 inches WC for natural gas units and 0.55 inches WC for natural gas with a filter section or Cambridge Air Solutions. Spec Air Series Technical Manual...
  • Page 19 (approximately " 1-1/2" to 2 long that is evenly spread across the burner (without gaps). Verify that the minimum fire flame signal is steady and above 2.0 microamps (mA). Spec Air Series Technical Manual Cambridge Air Solutions...
  • Page 20 If adjustment is required, the Low Fire Start adjustment screw is located on the multi-functional PC board as shown in the drawing. Only minor adjustments are normally required to obtain the proper setting. Cambridge Air Solutions. Spec Air Series Technical Manual...
  • Page 21 Turn the blower and burner service switches to the “REMOTE” position and, if applicable, turn the Remote Control Station mode selector switch to the “HEATING” position. c.1. If the Remote Control Station utilizes Spec Air Series Technical Manual Cambridge Air Solutions...

  • Page 22: Operating Instructions

    11. Unit runs and modulates discharge temperature warm up timing. to maintain space temperature set point. 7. Gas valve opens. 12. Repeat steps (2) through (12). 8. Burner lights. 9. Igniter is de-energized. Cambridge Air Solutions. Spec Air Series Technical Manual...
  • Page 23 4. Low airflow switch closes. 5. If inlet temperature is above entering air thermostat set point skip to step (12). 6. After the purge delay continue with igniter warm up timing. (cont'd on next page) Spec Air Series Technical Manual Cambridge Air Solutions...
  • Page 24 9. Burner lights 10. Igniter is de-energized 11. Low Fire Start is de-energized after 15 seconds 12. Unit runs at maximum discharge temperature to reach thermostat set point 13. Repeat steps (2) through (12) Cambridge Air Solutions. Spec Air Series Technical Manual...

  • Page 25: Electronic Thermostat

    OPERATING INSTRUCTIONS ELECTRONIC THERMOSTAT The Cambridge Air Solutions Operating Electronic Thermostat (OET) controls the unit’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 26 (-) the measured temperature. 2. Press and hold the button while HEAT OFF pressing the or the button until the DOWN desired temperature for the unit to turn OFF is displayed. Cambridge Air Solutions. Spec Air Series Technical Manual...

  • Page 27: Tss Controller

    OPERATING INSTRUCTIONS TSS CONTROLLER The Cambridge Air Solutions 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 28 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 Air Solutions. Spec Air Series Technical Manual...
  • Page 29 ON is "NO" if daylight saving time is not recognized. displayed. 4. Press the button to SETBACK SCHEDULE/EXIT exit the scheduling program. Spec Air Series Technical Manual Cambridge Air Solutions...
  • Page 30 HEAT ON and HEAT OFF 11.59PM and 12.00AM for time settings; between temperature settings for the amount of time set on 12.31 and 1.01 for date settings). the OVERRIDE timer. Cambridge Air Solutions. Spec Air Series Technical Manual...
  • Page 31 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 Spec Air Series Technical Manual Cambridge Air Solutions...
  • Page 32 DOWN desired ON time. 9. Press and bold the button while DAY OF WEEK pressing the or the button until the DOWN light for the desired day is illuminated. Cambridge Air Solutions. Spec Air Series Technical Manual...
  • Page 33 HED 7 SETBACK SCHEDULE/EXIT exit the scheduling program. HSD 8 HED 8 15. Verify that the correct current time and light for HSD 9 day of the week are still displayed. HED 9 Spec Air Series Technical Manual Cambridge Air Solutions...
  • Page 34 DOWN the desired holiday start date. 6. Repeat steps 2-5 until all required holiday cycles have been entered. 7. Press the button to SETBACK SCHEDULE/EXIT exit the scheduling program. Cambridge Air Solutions. Spec Air Series Technical Manual...
  • Page 35 (A period [.] after the F will indicate the Calibration Mode). 2. Pressing the or the button will display DOWN the current calibration difference above or below (-) the measured temperature. Spec Air Series Technical Manual Cambridge Air Solutions...

  • Page 36: Maintenance Instructions

    - Standard Service Seasonal Service (Motor is idle for 6 1 year 1 year months or more) Continuous Operation - Severe Service (High ambient, dirty 6 months 6 months or moist location, high vibration) Cambridge Air Solutions. Spec Air Series Technical Manual...

  • Page 37: Blower Cleaning

    Leak Check, of the Start-up Procedures (see page 16). BURNER CLEANING The Cambridge Air Solutions burner is for the most WARNING: part self-cleaning. However, if the application is In the extreme case, faulty valve operation will...

  • Page 38: Asco Gas Valves

    6. Replace the body gasket and the core/diaphragm sub-assembly with the closing spring attached. Locate the bleed hole in the core/diaphragm sub-assembly approximately 30˚ CCW from the valve inlet. Cambridge Air Solutions. Spec Air Series Technical Manual...
  • Page 39 ASCO Rebuild Kit. ∗ BONNET SCREW ∗ BLEED HOLE Locate bleed hole in ∗ core/diaphragm sub--- assembly approximately 30° from valve inlet  CAUTION Do not damage valve seat Disassembled View of ASCO Valve Spec Air Series Technical Manual Cambridge Air Solutions...

  • Page 40: Filters

    Disposable pleated panel filters are replaced when they become dirty. Replace the filter with the same size of filter which is removed from the filter section. Note the airflow markings on the filter. Cambridge Air Solutions. Spec Air Series Technical Manual...

  • Page 41: Reference

    27 1/2" 62 1/4" 31 1/8" 31 1/4" 18 3/4" 62 1/2" 33" 65 1/4" 36" 36 5/8" 18 5/8" 57" 39" 65 5/8" = UNIT DISCHARGE AREA UNIT BOTTOM UNIT INLET Spec Air Series Technical Manual Cambridge Air Solutions...

  • Page 42: Gas Train Drawing

    REFERENCE GAS TRAIN DRAWING Horizontal Mount > 400 MBH High Pressure CSA Certified ELECTRIC SAFETY SHUT-OFF VALVE (SSV) ELECTRIC SHUT-OFF VALVE (SOV) Cambridge Air Solutions. Spec Air Series Technical Manual...

  • Page 43: Electrical Control Enclosure Isometric Drawing (V18 - V30)

    REFERENCE ELECTRICAL CONTROL ENCLOSURE ISOMETRIC DRAWING NOTE: Component location and / or orientation may differ from that shown above. Spec Air Series Technical Manual Cambridge Air Solutions...

  • Page 44: Electrical Wiring Diagrams

    R1A&R1B Relay - Gas Valve Tamper Proof Space Sensor Fuse 120 Volt Control Temperature Sensor Temperature Setback System NOTE: Refer to wiring diagram shipped with unit for specific requirements of your installation. Cambridge Air Solutions. Spec Air Series Technical Manual...

  • Page 45: Connection Diagram

    Run separate from power wiring Run separate from all AC wiring requirements of your application Ground shield at control end only NOTE: Refer to wiring diagram shipped with unit for specific requirements of your installation. Spec Air Series Technical Manual Cambridge Air Solutions...

  • Page 46: Gas Control Systems

    Requires Maxitrol 44 controls and a signal to switch between modes (Exhaust Fan Interlock, Temperature Setback System, Manual Occupancy Switch, etc.) Cambridge Air Solutions. Spec Air Series Technical Manual...

  • Page 47: Remote Control Station Components

    Figure 1 timer with independent programs for summer ventilation/heating modes and integral electronic thermostat with separate selectable day/night setback temperatures (see page 25). The thermostat contact is wired between Z1 and Z2. Spec Air Series Technical Manual Cambridge Air Solutions...

  • Page 48: Individual Unit Component Descriptions

    A 115 volt GFI duplex receptacle, if selected, is provided outside the unit's electrical enclosure. The electrical supply source for this device is the unit’s control power transformer (5 amps max.). Figure 2 Figure 3 Cambridge Air Solutions. Spec Air Series Technical Manual...
  • Page 49 25% technicians may activate the above manifold gas pressure. The electrical circuit to assist in troubleshooting. adjustment screw is located under the top plate. Spec Air Series Technical Manual Cambridge Air Solutions...
  • Page 50 Maxitrol 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 Air Solutions. Spec Air Series Technical Manual...
  • Page 51 In the “LOCAL” or “OFF” position, the service technician has local control of the unit. These switches must be placed in the “REMOTE” position for normal control from the Remote Control Station. Spec Air Series Technical Manual Cambridge Air Solutions...
  • Page 52 Volt and FNM-1.6 for 150 va 115 Volt. Consult the unit wiring diagram to identify the proper fusing for the unit in question. Do not increase the fuse rating over that which is specified. Cambridge Air Solutions. Spec Air Series Technical Manual...

  • Page 53: Damper Motor Replacement & Adjustment

    “REMOTE” position. 6. Unscrew the motor bracket screws using a 3/8” socket. Set Point Line End Switch Dial Service Switch Rotation Visual Indicator Rotation Switch Power Light & Adaptation Button Status Light Spec Air Series Technical Manual Cambridge Air Solutions...

  • Page 54: Troubleshooting Guide

    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 Air Solutions. Spec Air Series Technical Manual...
  • Page 55 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. Spec Air Series Technical Manual Cambridge Air Solutions...
  • Page 56 Replace FSR. 3. Operating Thermostat a) Differential temperature setting too a) Increase differential temperature tight setting. 4. Damper Motor End Switch a) End switch making intermittent a) Replace end switch assembly. contact Cambridge Air Solutions. Spec Air Series Technical Manual...
  • Page 57 Space sensor located improperly 2. Modulating Valve (M611 or MR212) a) Disassemble valve and remove foreign a) Foreign material holding valve open material. b) Disassemble valve and assemble b) Modulating valve misassembled correctly. Spec Air Series Technical Manual Cambridge Air Solutions...
  • Page 58 Perform calibration calibration. c) Defective amplifier c) Replace amplifier. 3. Space Temperature Selector (T244A or TS244A/TD244A) a) Induced voltage in field wiring a) Utilize shielded, twisted pair wiring. Cambridge Air Solutions. Spec Air Series Technical Manual...

  • Page 59: Ansi/Ashrae/Iesna Standard 90.1

    Direct gas-fired heating equipment has no low rise residential buildings and buildings (or minimum efficiency requirement. However portions of buildings) that use energy primarily Cambridge Air Solutions certifies that its for industrial, manufacturing or commercial equipment has a 100% combustion efficiency processes.

  • Page 60: Maintenance Log

    MAINTENANCE LOG M O D E L N O . S E R I A L N O . Date Activity Technician Cambridge Air Solutions. Spec Air Series Technical Manual...

  • Page 61: Qr Code

    SCAN THIS CODE TO ACCESS OUR ”HOW-TO” SERVICE VIDEOS ONLINE. https://www.cambridgeair.com/parts-service/how-to-service-videos Cambridge Air Solutions 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 62 760 Long Road Crossing Dr., Chesterfield, MO 63005 Phone: (636) 532-2233 (800) 899-1989, Fax: (636) 530-6133 www.cambridgeair.com...

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