Carrier 58CTA/CTX Start-Up Procedures, Adjustments, Stage Furnace Setup Switch Description, U.S

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Table 10 – 2-Stage Furnace Setup Switch Description

 

 

 

 

SETUP

SWITCH

NORMAL

DESCRIPTION

SWITCH NO.

NAME

POSITION

OF USE

 

 

 

When OFF, allows 2--- stage operation with a single stage thermostat.

SW--- 1

Adaptive Heat Mode

OFF

Turn ON when using 2 stage thermostat to allow Low Heat opera---

tion when R to W/W1 closes and High Heat operation when R to

 

 

 

 

 

 

W/W1 and W2 close.

SW--- 2

Blower OFF delay

ON or OFF

Control blower OFF delay time. Used in conjunction with SW--- 3.

See Table 14.

 

 

 

SW--- 3

Blower OFF delay

ON or OFF

Control blower OFF delay time. Used in conjunction with SW--- 2.

See Table 14.

 

 

 

Step 2 — Start-Up Procedures

!WARNING

FIRE AND EXPLOSION HAZARD

Failure to follow this warning could cause personal injury, death and/or property damage.

Never test for gas leaks with an open flame. Use a commercially available soap solution made specifically for the detection of leaks to check all connections.

1.Purge gas lines after all connections have been made.

2.Check gas lines for leaks.

!WARNING

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could result in personal injury, or death.

Blower access door switch opens 115-v power to control. No component operation can occur unless switch is closed. Caution must be taken when manually closing this switch for service purposes.

3.To Begin Component Self-Test:

Remove blower access door. Disconnect the thermostat R lead from furnace control board. Manually close blower door switch. Short (jumper) the COM-24v terminal on control to the TEST/TWIN 3/16-in. (8 mm) quick-con- nect terminal on control until the LED goes out (approx- imately 2 sec). Gas valve and humidifier will not be turned on. Remove jumper from terminals. (See Fig. 33 and Table 10.)

NOTE: The furnace control allows all components, except the gas valve, to be run for short period of time. This feature helps diagnose a system problem in case of a component failure. Component test feature will not operate if any thermostat signal is present at the control.

Refer to service label attached to furnace or See Fig. 56. Component test sequence is as follows:

a.LED will display previous status code 4 times.

b.Inducer motor starts on high-speed and continues to run until Step g of component test sequence.

c.Hot surface igniter is energized for 15 sec., then off.

d.Blower motor operates on LO-HEAT speed for 10 sec.

e.Blower motor operates on HI-HEAT speed for 10 sec.

f.Blower motor operates on COOL speed for 10 sec.

g.Inducer motor goes to low-speed for 10 sec., then stops.

h.Reconnect R lead to furnace control board, remove tape from blower door switch and re-install blower door.

4.Operate furnace per instruction on inner door.

5.Verify furnace shut down by lowering thermostat setting below room temperature.

6.Verify furnace restarts by raising thermostat setting above room temperature.

Step 3 — Adjustments

!WARNING

FIRE HAZARD

Failure to follow this warning could result in injury, death and/or property damage.

DO NOT bottom out gas valve regulator adjusting screw. This can result in unregulated manifold pressure and result in excess over-fire and heat exchanger failures.

!CAUTION

FURNACE DAMAGE HAZARD

Failure to follow this caution may result in reduced furnace life.

DO NOT re-drill orifices. Improper drilling (burrs, out-of round holes, etc.) can cause excessive burner noise and misdirection of burner flames. This can result in flame impingement of heat exchangers, causing failures. (See Fig. 49.)

Furnace gas input rate on rating plate is for installations at altitudes up to 2000 ft. (610 M). Furnace input rate must be within +/-2% of furnace rating plate input. For altitudes above 5500 ft. (1676 M), a field-supplied high altitude pressure switch is required.

1.Determine the correct gas input rate.

In the U.S.:

The input rating for altitudes above 2,000 ft. (610 M) must be reduced by 4% for each 1,000 ft. (305 M) above sea level.

For installations below 2000 ft. (610 M), refer to the unit rating plate.

For installations above 2000 ft. (610 M), multiply the in- put on the rating plate by the derate multiplier in Table 11 for the correct input rate.

EXAMPLE:

88,000 BTUH INPUT FURNACE INSTALLED AT 4300 FT. (1310 M)

 

 

Derate

 

Furnace Input Rate

Furnace Input Rate

X

Multiplier

=

at Installation

at Sea Level

 

Factor

 

Altitude

88,000

X

0.90

=

79,200

In Canada: The input rating must be reduced by 10% for altitudes of 2,000 ft. (610 M) to 4,500 ft. (1372 M) above

58CT

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Contents Ama CUT Hazard Safety ConsiderationsFurnace Reliability Hazard Introduction DimensionsClearances to Combustibles Codes and Standards Electrostatic Discharge ESD Precautions ProcedureCarbon Monoxide Poisoning and Unit Damage Hazard LocationGeneral Location Relative to Cooling Equipment FIRE, Injury or Death HazardFire Hazard Property Damage HazardOutdoor Combustion Air Method AIR for Combustion VentilationFurnace Corrosion Hazard Carbon Monoxide Poisoning HazardAir for Combustion, Ventilation, and Dilution for Outdoors Upflow Installation InstallationSuspended Furnace Support Downflow InstallationHorizontal Installation FIRE, EXPLOSION, and Carbon Monoxide Poisoning HazardRoll-Out Protection Platform Furnace SupportDuct Flanges Opening dimensions In. mmHorizontal Unit Suspension Ductwork Acoustical Treatment Supply Air Connections Filter Arrangement Carbon Monoxide Poisoning HazardAIR Ducts General RequirementsSpeed External Static Pressure IN. WC Size Inlet Air Delivery CFM With FilterFurnace GAS Piping Fire or Explosion Hazard Air Delivery CFM With Filter*Downflow Furnaces Return Air ConnectionsUpflow Return Air Configurations and Restrictions Furnace Damage Hazard Maximum Capacity of PipeFurnace MAY not Operate Hazard WiringElectrical Connections Electrical Shock Hazard Electrical Shock and Fire HazardElectrical Connection to J-BOX Electrical DataBOX Relocation Fire or Electrical Shock Hazard Power Cord Installation in Furnace J-BOXBX. Cable Installation in Furnace J-BOX Electrical Box on Furnace Casing Side. See FigTwo-Stage Furnace with Two-Speed Air Conditioner See notes 2, 11, and 12 on the page following these figures Venting AccessoriesMasonry Chimney Requirements General Venting RequirementsChimney Inspection Chart Vent Height Appliance Application RequirementsInternal Area of Chimney Upflow Application-Vent Elbow Up Downflow Application-Vent Elbow Up then Left Horizontal Left Application Vent Elbow Left Diameter Vent Height Orientation INPUTBTUH/HR Furnace VentUsing Tin Snips to Cut Tie Points Burn Hazard START-UP, ADJUSTMENT, and Safety CheckGeneral Fire and Explosion Hazard Start-Up ProceduresAdjustments Stage Furnace Setup Switch DescriptionRedundant Automatic Gas Control Valve Altitude Derate Multiplier for U.S.AOrifice Hole Seconds Size of Test Dial For Revolution Gas Rate cu ft. /hrFurnace Overheating Hazard Color Speed AS Shipped Speed SelectionDesired Heating Mode Setup Switch Blower OFF Delay SEC Check Safety ControlsChecklist Stage Furnace Blower OFF delay Setup SwitchA08485 Orifice Size and Manifold Pressures In wc for Gas Input Rate A08219 A08219A Introduction Service and Maintenance ProceduresCarbon Monoxide Poisoning and Fire Hazard Care and MaintenanceWiring Diagram Blower Motor and Wheel Cleaning AND/OR Replacing AIR FilterFilter Size Information IN. / MM Unit Damage Hazard Cleaning Heat ExchangerIgniter Position-Top View Sequence of Operation58CT Single-Speed Cooling Single-Stage Thermostat and Two-Speed Cooling Adaptive ModeThermidistat Mode Continuous Blower Mode Wiring DiagramsTroubleshooting Troubleshooting Guide 2-Speed KitAdapter Chimneyin Usedswitch Shutoffvent Blocked Catalog No58CT---10SI