Carrier 48EZ(N)-A installation instructions Check Gas Input, Adjust Gas Input, Unit Damage Hazard

Page 15

integrated gas unit controller (IGC) has the capability to automatically reduce the evaporator “ON” delay and in- crease the evaporator “OFF” delay in the event of high duct static and/or partially-clogged filter.

Check Gas Input

Check gas input and manifold pressure after unit start-up (See Table 3). If adjustment is required proceed as follows:

SThe rated gas inputs shown in Table 3 are for altitudes from sea level to 2000 ft (610 m) above sea level. These inputs are based on natural gas with a heating value of 1025 Btu/ft3 at 0.60 specific gravity, or propane gas with a heating value of 2500 Btu/ft3 at 1.5 specific gravity.

IN THE U.S.A.:

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 2,000 ft (610 m), refer to the unit rating plate.

For installations above 2,000 ft (610 m) multiply the input by on the rating plate by the derate multiplier in Table 4 for correct input rate.

Table 4 – Altitude Derate Multiplier for U.S.A.*

ALTITUDE FT (M)

PERCENT OF DERATE

DERATE MULTIPLIER

FACTOR{

 

 

 

 

 

 

0---2000

0

1.00

(0---610)

 

 

 

 

 

2001---3000*

8--- 12

0.90

(610

---914)

 

 

 

 

 

 

3001

---4000

12--- 16

0.86

(315---1219)

 

 

 

 

 

 

4001

---5000

16--- 20

0.82

(1220

---1524)

 

 

 

 

 

 

5001

---6000

20--- 24

0.78

(1524

---1829)

 

 

 

 

 

 

6001

---7000

24--- 28

0.74

(1829

---2134)

 

 

 

 

 

 

7001

---8000

28--- 32

0.70

(2134

---2438)

 

 

 

 

 

 

8001

---9000

32--- 36

0.66

(2439

---2743)

 

 

 

 

 

9001---10,000

36--- 40

0.62

(2744

---3048)

 

 

*In Canada see Canadian Altitude Adjustment.

{Derate multiplier factors are based on midpoint altitude for altitude range.

BURNER FLAME

BURNER

MANIFOLD

C99021

Fig. 10 - Monoport Burner

IN CANADA:

The input rating for altitudes from 2,000 to 4,500 ft (610 m to 1372 m) above sea level must be derated 10% by an authorized Gas Conversion Station or Dealer.

EXAMPLE:

90,000 Btu/hr Input Furnace Installed at 4300 ft (1311 m).

Furnace Input Rate at

X

Derate Multiplier

=

Furnace Input Rate at

Sea Level

 

Factor

 

Installation Altitude

90,000

X

0.90

=

81,000

When the gas supply being used has a different heating value or specific gravity, refer to national and local codes, or contact your distributor to determine the required orifice size.

 

!

CAUTION

 

 

 

 

 

 

 

 

 

 

 

UNIT DAMAGE HAZARD

 

 

 

Failure to follow this caution may result in reduced unit

 

 

 

 

 

and/or component life.

 

 

 

 

 

Do Not redrill

an orifice. Improper drilling (burrs,

 

 

 

 

 

out-of-round holes, etc.) can cause excessive burner noise

 

 

 

 

 

and misdirection of burner flame. If orifice hole appears

 

 

 

 

 

damaged or it is suspected to have been redrilled, check

 

 

 

 

 

orifice hole with a numbered drill bit of correct size.

 

 

 

 

 

 

 

 

 

 

Adjust Gas Input

 

 

 

 

The gas input to the unit is determined by measuring the gas flow

 

at the meter or by measuring the manifold pressure. Measuring the

 

gas flow at the meter is recommended for natural gas units. The

 

A

manifold pressure must be measured to determine the input of

--

propane gas units.

 

 

 

 

 

 

48EZ

Measure Gas Flow (Natural Gas Units)

 

Minor adjustment to the gas flow can be made by changing the

 

manifold pressure. The manifold pressure must be maintained

 

between 3.2 and 3.8 IN. W.C.

 

If larger adjustments are required, change main burner orifices

 

following the recommendations of national and local codes.

 

NOTE: All other appliances that use the same meter must be

 

turned off when gas flow is measured at the meter.

 

Proceed as follows:

 

 

 

 

1.Turn off gas supply to unit.

2.Remove pipe plug on manifold (See Fig. 11) and connect manometer. Turn on gas supply to unit.

3.Record number of seconds for gas meter test dial to make one revolution.

4.Divide number of seconds in Step 3 into 3600 (number of seconds in one hr).

Pipe Plug

Manifold

 

A07679

Fig. 11 - Burner Assembly

5.Multiply result of Step 4 by the number of cubic feet (cu ft) shown for one revolution of test dial to obtain cubic feet (cu ft) of gas flow per hour.

6.Multiply result of Step 5 by Btu heating value of gas to obtain total measured input in Btuh. Compare this value with heating input shown in Table 3 (Consult the local gas supplier if the heating value of gas is not known).

15

Image 15
Contents Safety Considerations Table of ContentsProvide Unit Support Receiving and InstallationIntroduction Check Equipment48EZ-A24-36 Unit Dimensions 48EZ-A42-60 Unit Dimensions Number Roof Curb DimensionsInspection Field Fabricate DuctworkProvide Clearances Rig and Place UnitRigging/Lifting of Unit See Fig Install Flue HoodInstall Gas Piping Connect Condensate DrainSediment Trap Fire or Explosion HazardConfiguring Units for Downflow Vertical Discharge Install Duct ConnectionsPhysical Data Unit 48EZ-A Physical Data Unit 48EZ-A Cont’d Maximum Gas Flow CapacityHeating Inputs Unit Component Damage Hazard Install Electrical ConnectionsSpecial Procedures for 208-V Operation High-Voltage ConnectionsTransformer Protection Balance Point Setting-Thermidistat or Hybrid ThermostatPRE-START-UP Control Voltage ConnectionsUnit Sequence of Operation Start-up Heating and Make Adjust- mentsSTART-UP Check for Refrigerant LeaksAdjust Gas Input Check Gas InputUnit Damage Hazard Start-up Cooling and Make Adjust- ments Unit Operation Hazard Checking and Adjusting Refrigerant ChargeIndoor Airflow and Airflow Adjustments Gas Heating Fan Speed Set-upTwo Cooling Fan Speeds Set-up Dehumidification feature used Continuous Fan OperationColor Coding for Indoor Fan Motor Leads Dry Coil Air Delivery* Horizontal Unit 48EZ-A24-60 Unit Heating Rise MotorRange Speed Color Dry Coil Air Delivery* Horizontal Discharge Unit 48EZ-A24-60 1354 1290 1226 1158 1102 1046 981 918 843 55oF Heating Rise Medium1 48EZ ---,NA48090 48EZ ---,NA48130 Unit Heating Rise Motor Wire Cooling Standard CFM Scfm Horizontal and Downflow Filter Pressure Drop Table IN. W.CUnit Standard CFM Scfm Size Downflow Cooling Standard CFM Scfm Economizer + Tons48EZ a 208/230-1-60 Ladder Wiring Diagram, Unit 48EZ-A 208/230-3-60 Connection Wiring Diagram, Unit 48EZ-A Cont. 208/230-3-60 Ladder Wiring Diagram, Unit 48EZ-A Cooling Charging Table-Subcooling Indoor Blower and Motor MaintenanceCleaning the Blower Motor and Wheel Air FilterMain Burners Limit SwitchInduced Draft combustion air Blower Assembly Burner IgnitionElectrical Controls and Wiring Outdoor FanRefrigerant Circuit Indoor Airflow Pressure SwitchesLoss of Charge Switch Gas InputHigh-Pressure Switch Copeland Scroll Compressor Puron RefrigerantExplosion Hazard Unit Operation and Safety Hazard Refrigerant SystemCompressor Oil Troubleshooting START-UP ChecklistPuronr R-410A Quick Reference Guide Symptom Cause Remedy Troubleshooting Guide Cooling or Heat Pump Heating ModeTroubleshooting Guide-Heating Troubleshooting Guide-LED Error CodesLED OFF III. START-UP Electrical Supply Voltage Compressor Amps TemperaturesRemove and Store in Job Files Preliminary Information Model no