cask of amontillado study guide answers
LINK 1 ENTER SITE >>> Download PDF
LINK 2 ENTER SITE >>> Download PDF
File Name:cask of amontillado study guide answers.pdf
Size: 2731 KB
Type: PDF, ePub, eBook
Category: Book
Uploaded: 24 May 2019, 14:16 PM
Rating: 4.6/5 from 825 votes.
Status: AVAILABLE
Last checked: 16 Minutes ago!
In order to read or download cask of amontillado study guide answers ebook, you need to create a FREE account.
eBook includes PDF, ePub and Kindle version
✔ Register a free 1 month Trial Account.
✔ Download as many books as you like (Personal use)
✔ Cancel the membership at any time if not satisfied.
✔ Join Over 80000 Happy Readers
cask of amontillado study guide answersWe have 1 Carrier WeatherMaker Two-Zone manual available for free PDF download: Installation And Start-Up Instructions Manual. Consult a qualified installer, service agency, or your distributor or branch for infor- mation or assistance. The qualified installer or agency must use factory-authorized kits or accessories when modifying this prod- uct. Refer to the individual instructions packaged with the kits or accessories when installing. Have fire extinguisher available. Read these instructions thoroughly and follow all warnings or cautions attached to the unit. Consult local and state building codes and Sheet Metal and Air Conditioning National Association (SMACNA) for special installation require- ments. This is the safety-alert symbol These words are used with the safety-alert symbol. DAN- GER identifies the most serious hazards which will result in severe personal injury or death. WARNING signifies hazards which could result in personal injury or death. CAUTION is used to identify unsafe practices which would result in minor personal injury or product and property damage. It is imperative equipment is not over sized. Each zone has independent temperature settings controlled by a thermostat. This allows WeatherMaker Two-Zone to change the temperature settings in zones to reflect occupancy or usage. The WeatherMaker Two-Zone System uses motorized air volume control dampers (also called zone dampers) to regulate the flow of conditioned air into the zones. Consult a qualified installer, service agency, or your distributor or branch for information or assistance. The qualified installer or agency must use factory-authorized kits or accessories when modifying this product. Consult local and state building codes and Sheet Metal and Air Conditioning National Association (SMACNA) for special installation requirements. This is the safety-alert symbol. When you see this symbol on the unit or in instructions and manuals, be alert to the potential for personal injury.window.parent.OnUploadCompleted(202,"/userfiles/ep-9npa sli-manual.xml">http://xn--j1aai7d.xn--p1ai/text/javascript">window.parent.OnUploadCompleted(202,"/userfiles/ep-9npa sli-manual.xml
- Tags:
- cask of amontillado study guide answers, the cask of amontillado study questions answers, the cask of amontillado reading questions answers, the cask of amontillado reading guide answer key, the cask of amontillado study guide questions and answers, cask of amontillado worksheet answers, cask of amontillado study guide answers.
These words are used with the safety-alert symbol. DANGER identifies the most serious hazards which will result in severe personal injury or death. CAUTION is used to identify unsafe practices which would result in minor personal injury or product and property damage. Equipment selection is matched to block load. It is imperative equipment is not over sized. It is imperative ductwork is not under sized. Each zone has independent temperature settings controlled by a thermostat. This allows WeatherMaker Two-Zone to change the temperature settings in zones to reflect occupancy or usage. The WeatherMaker Two-Zone System uses motorized air volume control dampers (also called zone dampers) to regulate the flow of conditioned air into the zones. If thermostats are to be located more than 100 ft from the WeatherMaker Two-Zone Center as measured along the control voltage wires, use 16 AWG colored-coded wires to avoid excessive voltage drop. All wiring is run back to the WeatherMaker Two-Zone Center. Do not mount WeatherMaker Two-Zone Center where it will be accessible to children. Do not locate the center in areas of the home that are noise sensitive since relays are energized and de-energized during operation and may be an annoyance.Locate in an area that is easily accessible in case servicing should be required. Reference multi-damper enabler Installation Instructions. The black mark on the end of the damper shaft represents the position of the damper blade. Make sure insulation does not interfere with operation of actuator. Apply 24vac between COM and OPN to open the damper and COM and CLS to close the damper. (See Fig. 3.) The damper will modulate counter-clockwise to open and clockwise to close. Release button to hold damper shaft in the new position. In areas where excessive condensing may occur, carefully Do not allow mastic to come in contact with actuator. Do not allow mastic to come in contact with actuator. Do not allow mastic to come in contact with actuator.http://alliance-ltd.com/userfiles/ep-d3va-manual.xml Do not allow mastic to come in contact with actuators It is recommended that the bypass be installed. Be sure the bypass is properly supported. For single-speed furnace applications, the bypass air must never exceed 25 percent. The duct sensor must be radiant shielded to prevent heat from affecting the correct air temperature. The sensor is to be installed downstream of the indoor coil, but before the electric heaters. It can be installed through the wall of the fan coil or may be located entirely inside the fan coil near the blower inlet. Anchor firmly in place with cable ties so that it cannot interfere with the blower wheel. To activate the HP temperature sensor, remove factory supplied resistor from HP terminal block and replace with sensor leads. This is non-adjustable. (See Fig. 12 for connection to WeatherMaker Two-Zone center.) If so, the WeatherMaker Two-Zone System will perform the following: The actual control of the dampers, HVAC equipment, and system fan will change with the configuration of the system. Depending upon the configuration, WeatherMaker Two-Zone can control heat pumps, furnaces, and dual fuel applications, (dual fuel will require a third party relay interface). WeatherMaker Two-Zone will then prepare to operate the heating or cooling equipment as requested by the thermostat. (See Fig. 12.) The intent is to provide the HVAC equipment with unrestricted ductwork and to reduce pressure surges. WeatherMaker Two-Zone also fully opens the dampers whenever a heating or cooling cycle is completed (this is done after a 90 sec delay). All zone dampers will remain fully open until the next heating or cooling cycle. One example may be a Heat Recovery Ventilator. If WeatherMaker Two-Zone is not actively controlling the HVAC system, then it must not impose any control influences (such as closed zone dampers) on the system and prevent proper operation of other devices. When the zone 1 thermostat has the fan selector switch in the AUTO position, the fan will operate only when the heating and cooling equipment is operating. When the zone 1 thermostat has the fan selector switch in the ON position, the fan will operate continuously. Zone 2 will not control this. WeatherMaker Two-Zone operates the heat pump by energizing the compressor contactor and controlling the reversing valve through the O relay output. The W1 and W2 contacts are always used for heat sources. These are heating only units such as furnaces, strip heaters, etc. The relay outputs for WeatherMaker Two-Zone are shown in Table 1. This changes actual load that is applied to the HVAC equipment. If the zone airflow decreases, the cooling equipment will tend to lower supply-air temperatures which could tend to exceed the LAT trip limits. Conversely, the heating equipment will tend to raise the supply-air temperatures which could exceed high trip limits. In the heating mode, WeatherMaker Two-Zone will perform the same duct temperature optimization. The trip limits will be determined by the jumper setting. (See Fig. 12.) This will continue until the LAT problem is corrected. This control is especially useful in retrofit applications where the size and routing of the ductwork may not be entirely known or satisfactory. The other zone in the system may or may not have an open damper depending upon its particular needs. WeatherMaker Two-Zone will detect this, and open up the closed damper allowing the equipment to continue to operate. A 10k resistor can be installed in place of the duct sensor at the terminal block. By disabling the duct temperature optimizer, the LAT safety algorithm is removed from the system. The heating LAT is adjustable for the duct sensor. In this Installation Instruction, you will find the section showing an adjustment for the heating LAT. (See Fig. 12.) It is very important that this temperature is properly set. For gas or oil furnaces, the temperature limit will be in the higher temperature range. For heat pumps the temperature setting should always be in the lower temperature range. If this condition persists, it should always be looked upon as an indication of a HVAC problem, not a WeatherMaker Two-Zone problem. See pre-sale literature for thermostat part numbers. Review and understand the following items before installing. This will assure that Y signals are generated for cooling, and W signals are generated for heating from thermostat to zone module input. If installation is a heat pump system, the zone control board will provide proper output signal to heat pump. This will disable the Timeguard and 4-cycle per hr (cph) protection built into thermostat. Let zone control board perform the Timeguard and cycle protection. Refer to thermostat Installation Instruction under Zoning for more detail. Connect G between zone 1 thermostat and zone 1 input on zone control module. Do not use Tstat HP option. When Tstat Fnc is selected this will setup control inputs to recognize Y1 and Y2 for firstand second-stage cooling, W1 and W2 for firstand second-stage heating. When a heat pump system is used, Equipmt HP mode should be selected. The zone control board will provide the proper output signal to the heat pump. With Fan mode should be selected when a heat pump is installed and fan is needed to come on immediately with demand.When DTO On is selected (Factory default) and if a LAT trip occurs, closed dampers will begin opening to try and keep equipment running by maintaining proper air temperatures. However, if LAT temperatures exceed their limits, equipment will start staging down. When DTO Off is selected, equipment will stage down. Closed dampers will not open on inial trip, however if LAT temperatures exceed their limits, control will lockout and damper will open. You get 1 for each file you add. TABLE OF CONTENTS PAGE Safety Considerations.1 Installation Considerations.1 Introduction.1 Installation.1-4 Sequence Of Operation.4-7 Thermostat Wiring.6-8 Care And Maintenance.8 Troubleshooting.9-11 Wiring Diagrams.12-16 Wiring Diagram Notes.16 SAFETY CONSIDERATIONS Improper installation, adjustment, alteration, service, maintenance, or use can cause fire, electrical shock, or other conditions which may cause personal injury or property damage. Refer to the individual instructions packaged with the kits or accessories when installing. Follow all safety codes and wear safety glasses. Have fire extinguisher available. Consult local and state building codes and Sheet Metal and Air Conditioning National Association (SMACNA) for special installation require- ments. Recognize safety information. This is the safety-alert symbol. When you see this symbol on the unit or in instructions and manuals, be alert to the potential for personal injury. Understand the signal words DANGER, WARNING, or CAU- TION. These words are used with the safety-alert symbol. CAUTION is used to identify unsafe practices which would result in minor personal injury or product and property damage. Equipment selection is matched to block load. It is imperative equipment is not over sized. 7. Ductwork must be designed based off the sum of peak plus 25 percent oversize. It is imperative ductwork is not under sized. INTRODUCTION The WeatherMaker Two-Zone System allows the air conditioning and heating equipment to control temperatures in 2 distinct spaces or zones within a building. Each zone has independent temperature settings controlled by a thermostat. NOTE: Thermostats are purchased separately. The comfort temperature settings can change automatically through the use of schedules if programmable thermostats are selected. This allows WeatherMaker Two-Zone to change the temperature settings in zones to reflect occupancy or usage. Rev HOT parts under this label Y1 W1 W2 W1 W2 G RH RC B O Y2 Y1 Equipment Term. Make sure insulation does not interfere with operation of actuator. Before insulating the ductwork, check for proper damper operation. Apply 24vac between COM and OPN to open the damper and COM and CLS to close the damper. (See Fig. 3.) The damper will modulate counter-clockwise to open and clockwise to close. To prevent personal injury or possible equipment damage, disconnect the power supply before routing wire. MOUNTING HUB AIRFLOW NOTE: Use No. PAGE 5 If you encounter a situation where 1 zone seems to have poor ductwork, then the WeatherMaker Two-Zone system is capable of reverting back to a fully open, constant-volume system. If this condition persists, it should always be looked upon as an indication of a HVAC problem, not a WeatherMaker Two-Zone problem. In automatic changeover, the zoning system works on a first come first serve basis. High Heating Temperature Trip Limit Setting — When DTO is On, temperature is sensed by duct temperature sensor. PAGE 10 I J K L Red LED—Displays ON when fan is energized. M Red LED—Displays ON when first-stage cooling is energized. N Red LED—Displays ON when second-stage cooling is energized. O Red LED—Displays ON when first-stage heat is energized. Red LED—Displays ON when second-stage heat is energized. J2 (Not Shown)—Cut for 50 hz operation. Located under plastic housing approximately 1 in.Red LED—Displays ON when reversing valve is energized. TA F NTNTS PA Safety onsiderations.1 Installation onsiderations.1 Introduction.1 Installation Sequence f peration Thermostat Wiring Troubleshooting Wiring Diagrams are And Maintenance.20 MFT ZNIN SSTM SAFT NSIDATINS Improper installation, adjustment, alteration, service, maintenance, or use can cause fire, electrical shock, or other conditions which may cause personal injury or property damage.The qualified installer or agency must use factory-authorized kits or accessories when modifying this product.Follow all safety codes and wear safety glasses. Have fire extinguisher available.This is the safety-alert symbol. Understand the signal word DAN, WANIN, or AU- TIN. DAN- identifies the most serious hazards which will result in severe personal injury or death. WANIN signifies hazards which could result in personal injury or death. AUTIN is used to identify unsafe practices which would result in minor personal injury or product and property damage. INSTAATIN NSIDATINS 1. Install in non-condensing area with ambients between 32 F and 120 F. 2. Use vibration isolators (flex connectors) on zone dampers and ductwork to minimize noise. 3. Place dampers away from areas that may be noise sensitive. 4. TXV is required in air conditioning and heat pump applications. 5. Use separate isolated transformer to supply power to WeatherMaker Two-Zone enter. (40va minimum, class 2, transformer, field supplied) T'stat HP Fnc ff n WANIN. HT parts under this label Fig. 1 WeatherMaker Two-Zone System A oad calculations must be performed to determine equipment size.It is imperative the equipment is not over sized. 7. Ductwork must be designed based off the sum of peak plus 25 percent oversize. It is imperative the ductwork is not under sized. INTDUTIN The WeatherMaker Two-Zone System allows the air conditioning and heating equipment to control temperatures in 2 distinct spaces or zones within a building.NT: Thermostats are purchased separately. INSTAATIN Step 1 heck quipment and Jobsite INSPT QUIPMNT File claim with shipping company, prior to installation, if shipment is damaged or incomplete.Make sure insulation does not interfere with operation of actuator.Apply 24vac between M and PN to open the damper and M and S to close the damper. (See Fig. 3.) The damper will All wiring must comply with local, state, and national codes. NT: Use No. 18 AW color-coded, insulated (35 min) wire. If thermostats are to be located more than 100 ft from the WeatherMaker Two-Zone enter as measured along the control voltage wires, use 16 AW colored-coded wires to avoid excessive voltage drop. All wiring is run back to the WeatherMaker Two-Zone enter. Step 3 Install WeatherMaker Two-Zone NT: WeatherMaker Two-Zone is approved for indoor use only and should never be installed with any of its components exposed to the elements. Do not mount the the WeatherMaker Two-Zone enter where it will be accessible to children. Do not locate the center in areas of the home that are noise sensitive since relays are energized and and de-energized during operation and may be an annoyance. Install WeatherMaker Two-Zone in an area with a temperature range between 32 F and 120 F. Install the WeatherMaker Two-Zone center in a vertical position.MUNTIN HU AIFW AIFW PSITIN INDIAT ATUAT HUSIN QUIK AD AS UTTN (D) FID INSTAD PW WIIN S M PN ANUA TATIN STPS MUNTIN AKT To prevent possible damage to the WeatherMaker Two-Zone enter, do not mount on plenum, ductwork, or flush against furnace. Step 4 Install Zone Dampers IMPTANT: If conditions exist for possible condensing, the motor must be positioned for adequate draining. (See Fig. 2.) NT: If a multi-damper enabler is used to link dampers together, then add 5va per damper to the transformer power supply rating.Zone dampers may be installed in any direction. Install dampers so the actuator is visible for inspection and accessible in the event it would ever need service. The black mark on the end of the damper shaft represents the position of the damper blade. DAMP MUNTIN AKT Fig. 3 Damper 24-vac onnections A95096 modulate counter-clockwise to open and clockwise to close. If in an emergency it becomes necessary to force a damper open manually, press in the red quick blade release button with 1 hand and turn the mounting hub to reposition the damper shaft.To avoid noise and vibration, do not hard mount dampers to any solid structure such as joists.In areas where excessive condensing may occur, carefully 2 3. Properly seal joint using duct tape, mastic, or other approved method. NT: There should be a minimum of 4 ft between the zone damper and the first branch duct if more than 1 branch duct is downstream of the zone damper. UND FXI DUTWK 1. Slip 1 end of flexible ductwork over 1 end of zone damper. (See Fig. 8.) 3 2 T 3 A92480 Fig. 10 ectangular Fibrous lass Ductwork 2. Screw field-supplied screws and tabs into zone damper. 3. Properly seal joint using duct tape, mastic, or other approved method. It is recommended that the bypass be installed. The bypass should be installed according to local codes and SMANA standards.For single-speed furnace applications, the bypass air must never exceed 25 percent. Step 6 Install Duct Temperature Sensor ocate the duct temperature sensor in the main supply trunk after the heating and cooling coil and before the bypass damper and before the first branch. The sensor should be installed between the Dx coil and the heater heaters. To activate the Dx coil temperature sensor, remove factory supplied resistor from Dx terminal block and replace with sensor leads. When activated, the Dx sensor has built in AT setpoints of 105 F and 110 F. This is non-adjustable. SQUN F PATIN Step 1 Sequence of vents for a Normal Heating or ooling ycle The thermostats will determine if active heating or cooling is required. If so, the WeatherMaker Two-Zone system will perform the following: Make sure all zone dampers are fully open.The equipment may be a compressor, furnace, strip heater, etc. Set the zone damper to the open or closed position based upon the individual zone demand.Turn off the heating or cooling equipment when all zones are satisfied.This is the basic sequence of operation for the WeatherMaker Two-Zone System. The actual control of the dampers, HVA equipment, and system fan will change with the configuration of the system. Depending upon the configuration, WeatherMaker Two-Zone can control heat pumps, furnaces, and dual fuel (this may require a third party relay interface, depending on equipment configuration) applications. Step 2 Selection of a System Mode The first step in any heating or cooling cycle requires Weather- Maker Two-Zone to receive an input from any thermostat located in a zone. The intent is to provide the HVA equipment with unrestricted ductwork and to reduce pressure surges. All the zone dampers will remain fully open until the next heating or cooling cycle. The other reason for opening the dampers is to provide unrestricted ductwork to other equipment which is not directly controlled by WeatherMaker Two-Zone.If WeatherMaker Two-Zone is not actively controlling the HVA system, then it must not impose any control influences (such as closed zone dampers) on the system and prevent proper operation of other devices.When the zone 1 thermostat has the fan selector switch in the AUT position, the fan will operate only when the heating and cooling equipment is operating. When the zone 1 thermostat has the fan selector switch in the N position, the fan will operate continuously. Zone 2 will not control this. Step 4 HVA quipment onnections The WeatherMaker Two-Zone relay outputs are shown in Table 1. The and contacts are used for the compressor contactor only. The and contacts are always used for heat sources. The relay outputs for WeatherMaker Two-Zone are shown in Table 1. In automatic changeover, the zoning system works on a first come first serve basis. Step 5 Duct Temerature ptimizer (AT eaving Air Temperature) As the WeatherMaker Two-Zone system operates through a heating or cooling cycle, the zone demands will change. This changes the actual load that is applied to the HVA equipment. If the zone airflow decreases, the cooling equipment will tend to lower the supply-air temperatures which could tend to exceed the AT trip limits.In cooling, when the AT reaches the non-adjustable low temperature trip limit (50 F) the AT algorithm begins operating, closed dampers are initially opened 3 positions, then 1 position every 20 sec there after until full open. WeatherMaker Two-Zone will not shut down second-stage cooling (if used); however, if temperature continues to drop to 45 F zoning system will turn off both stages of cooling. If the temperature improves the system will stay in the duct temperature optimizer mode until the AT reaches 55 F or higher. At 55 F the AT algorithm will reset and return dampers to their original position. In the heating mode, Weather- Maker Two-Zone will perform the same duct temperature optimization. The trip limits will be determined by the jumper setting. (See Fig. 12.) This will continue until the leaving air temperature (AT) problem is corrected. This control is especially useful in retrofit applications where the size and routing of the ductwork may not be entirely known or satisfactory. The duct temperature optimizer works by controlling how cold or hot the air inside the supply-air duct gets by monitoring the temperature of the air inside the supply-air system. Whenever WeatherMaker Two-Zone is providing heating or cooling, the zone within the home that is asking for the conditioned air will always have its damper fully open. The other zone in the system may or may not have an open damper depending upon its particular needs. WeatherMaker Two-Zone will detect this, and open up the closed damper allowing the equipment to continue to operate. The duct temperature optimizer may be disabled on the control center. A 10k resistor can be installed in place of the duct sensor at the terminal block.It is highly recommended that you use this control option. The heating AT is adjustable for the duct sensor. In this Installation Instruction, you will find the section showing an adjustment for the heating AT. (See Fig. 12.) It is very important that this temperature is properly set. For gas or oil furnaces, the temperature limit 5 will be in the higher temperature range. For heat pumps the temperature setting should always be in the lower temperature range. If you encounter a situation where 1 zone seems to have poor ductwork, then the WeatherMaker Two-Zone system is capable of reverting back to a fully-open, constant-volume system. If this condition persists, it should always be looked upon as an indication of a HVA problem, not a WeatherMaker Two-Zone problem. Step 6 lectronic Thermostat onnection with WeatherMaker Two-Zone ontrol orporate-made Non-programmable and programmable thermostats can be connected to the Zone Perfect Two-Zone. See pre-sale literature for thermostat part nos. NT: The zone control board is only capable of 2-stage heat and 2-stage cool operation. Fig. 13 and 14 will reflect these applications only.THMSTAT STUP 1. Thermostat will not operate unless both and are connected to zone module input. 2. If selected thermostat is a heat pump (HP) or 2-speed (2S) model, convert thermostat to air conditioning operation. This will assure that signals are generated for cooling, and W signals are generated for heating from thermostat to zone module input. If installation is a heat pump system, the zone control board will provide proper output signal to heat pump. 3. Select Zoning option on thermostat. This will disable the Timeguard and 4-cycle per hour (cph) protection built into thermostat.ZN NT AD STUP 1. onfigure zone control board jumper for T stat (thermostat) Fnc option only. Do not use T stat HP option. When T stat Fnc is selected this will setup control inputs to recognize and for first and second stage cooling, and for first and second stage heating. 2. onfigure zone control board for either quipmt (equipment), HP or Fnc. When quipmt HP mode is selected a heat pump should be used. With fan mode should be selected when a heat pump is installed and fan is needed to come on immediately with demand. When DT is on is selected and if a AT trips occurs, closed dampers will begin opening to try and keep equipment running by maintaining proper air temperatures. However, if AT temperatures exceed their limits, equipment will start staging down. When DT off is selected, equipment will stage down.Set thermostat dip switch to N to convert thermostat to A operation. Disable timeguard and cycle protection in thermostat by setting it to zone mode.Set thermostat dip switch to N to convert thermostat to A operation. Disable timeguard and cycle protection in thermostat by setting it to zone mode.TU UTD SNS NNTIN S1 S2 TW-STA HAT, TW-STA S NTS 1, 3 AND 4 Fig. 14 orporate-model Programmable Thermostat Wiring Diagrams 8 A95214 9 Step 7 TUSHTIN This section contains information to assist you in troubleshooting problems and errors associated with the WeatherMaker Two-Zone system. Step 8 System Diagram, Jumpers, and Switches NT: The duct and Dx inputs must have either a sensor or a 10k resistor connected. 10K ohm resistor in place or with a Dx coil temperature sensor attached. High Heating Temperature Trip imit Setting Temperature sensed by duct temperature sensor. When the duct temperature reaches this temperature setting, the duct temperature optimizer is enabled. If the AT is exceeded then heating will turn off. NT: Dx coil sensor recommended for heat pump operation.It should be switched to the N position only upon heat pump compressor failure to provide emergency heat. Damper Fuse Protects damper from electrical damage (3 Amp). D omprotec verride Momentarily short pins together for temporary equipment time delay override. Will change compressor lockout time form 5 minutes to 30 sec for 1 cycle. J6 jumper onnects c and h internally. F mergency heat D Will turn on when emergency Heat is on.H reen D Flashes once every second for normal operation, alternates with red D for diagnostic errors. 9 10 I ed D Displays N when fan is energized. M ed D Displays N when first-stage heat is energized. J ed D Displays N when first-stage cooling is energized. N ed D Displays N when second stage heat is energized. K ed D Displays N when second-stage cooling is energized. J2 (Not Shown) ut for 50 hz operation.Table 2 Troubleshooting D DS DSIPTIN ATIN QUID reen flashes 1 time every second and Normal operation. None. no other Ds are flashing.First-stage heat limit exceeded; heat will be locked out. Duct temperature sensor. Second-stage heat limit exceeded. First-stage cool limit exceeded; cool will be locked out. Second-stage cool limit exceeded. DX temperature sensor. First-stage heat limit exceeded; heat will be locked out. DX temperature sensor error. Secondstage heat limit exceeded. Second-stage cool limit exceeded. 1. Duct temperature sensor. 2. Temperature sensor is shorted. 1. Duct temperature sensor. 2. Temperature sensor is open. 1. Dx temperature sensor. 2. Temperature sensor is shorted. 1. Dx temperature sensor. 2. Temperature sensor is open. Damper fuse blown. Fatal control center circuit board failure. Wait until duct temperature cools below exceeded temperature trip. (Heat leaving air temperature trip limits set at AT limits PT on central control circuit board; range is 110 to 175 F.) Wait until duct temperature cools below exceeded temperature trip.Wait until duct temperature raises above exceeded temperature trip (50 F). Wait until Dx temperature cools below exceeded temperature trip. Fixed at 110 F. Wait until Dx temperature cools below exceeded temperature trip. Fixed at 105 F. Wait until duct temperature raises above exceeded temperature trip (45 F). Wait until duct temperature raises above exceeded temperature trip (50 F). 1. Verify that duct temperature sensor or 10K ohm resistor is attached to control center at duct temperature connectors. 2.