Manuals / Carrier / Household Appliance / Heating System

Carrier 48PG20-28 specifications Sensor Locations OAT and MAT, Temperature Changeover Set Points

Models: 48PG20-28

1 64

Download 64 pages 4.71 Kb

Page 40

Fig. 24 — Sensor Locations (OAT and MAT)

DAMPER

ASSEMBLY

WIRE

HARNESS

DAMPER	WIRE TIES
ACTUATOR
	PL7

ECONOMIZER BLOCK OFF

PL7

OUTSIDE AIR

ENTHALPY

INDOOR AIR

ENTHALPY

Fig. 23 — EconoMi$er IV Component Locations (Exploded View)

mA

MAT LOCATION

19

18	LED ON
18	D
17	D
17
16	LED OFF	LED ON
16	LED OFF	C
15		C
15
14		LED OFF	LED ON
13			B
13
12			LED OFF	LED ON
			LED OFF	A
11				A

OAT LOCATION

10

LED OFF

9

100

40

45

50

55

60

65

70

75

80

85

90

95

DEGREES FAHRENHEIT

Fig. 24 — Sensor Locations (OAT and MAT)

Fig. 25 — Temperature Changeover Set Points

Table 28 — EconoMi$er IV Sensor Usage

ECONOMI$ER IV WITH OUTDOOR AIR

ECONOMI$ER IV WITH SINGLE

APPLICATION

DRY BULB SENSOR

ENTHALPY SENSOR

Accessories Required

Accessories Required

Outdoor Air Dry Bulb

None. The outdoor air dry bulb sensor is factory installed.

CRTEMPSN002A00*

Differential Dry Bulb

CRTEMPSN002A00*

(2) CRTEMPSN002A00*

Single Enthalpy

HH57AC078

None. The single enthalpy sensor is factory installed.

Differential Enthalpy

HH57AC078

and

CRENTDIF004A00*

CRENTDIF004A00*

CO2 for DCV Control using a

33ZCSENCO2

33ZCSENCO2

Wall-Mounted CO2 Sensor

CO2 for DCV Control using a

33ZCSENCO2†

OR

33ZCSENCO2†

OR

and

CRCBDIOX005A00††

and

CRCBDIOX005A00††

Duct-Mounted CO2 Sensor

33ZCASPCO2**

33ZCASPCO2**

*CRENTDIF004A00 and CRTEMPSN002A00 accessories are used on many different base units. As such, these kits may contain parts that will not be needed for installation.

†33ZCSENCO2 is an accessory CO2 sensor.

**33ZCASPCO2 is an accessory aspirator box required for duct-mounted applications. ††CRCBDIOX005A00 is an accessory that contains both 33ZCSENCO2 and 33ZCASPCO2 accessories.

40

Image 40

Carrier 48PG20-28 Sensor Locations OAT and MAT, Temperature Changeover Set Points, EconoMi$er IV Sensor Usage

Contents

CONTENTS Installation, Start-Upand Service InstructionsSAFETY CONSIDERATIONS INSTALLATION Step 1 - Provide Unit Support Fig. 1 - Roof Curb Details Fig. 3 - Rigging Details Fig. 2 - Shipping Rail RemovalSHIPPING RAILS Fig. 4 - Base Unit Dimensions Table 1 - Physical Data 48PG 1750 Step 5 - Make Unit Duct Connections Fig. 5 - Alignment Hole DetailsFig. 6 - Alignment Hole Location Fig. 8 - Air Distribution - Concentric DuctStep 6 - Install Flue Hood and Inlet Hood Fig. 11 - Combustion Fan Housing LocationFig. 9 - Concentric Duct Details Fig. 10 - Flue and Inlet Hood LocationsStep 9 - Make Electrical Connections Fig. 12 - Condensate Drain DetailsFig. 13 - Condensate Drain Piping Details Fig. 14 - Field Gas PipingFig. 15 - Field Power Wiring Connections Fig. 16 - Field Control Thermostat WiringFig. 17 - Outdoor-AirHood Component Shipping LocationCOMPRESSOR 10.6 LEGEND AND NOTES FOR TABLES 4A AND 4B Fig. 18 - Outdoor-AirHood DetailsFig. 19 - Outdoor-AirHood Assembled Fig. 20 - Manual Damper DetailsFig. 22 - Bracket and Hood Positioning PRE-START-UP START-UP3.Connect pressure gage to manifold pressure tap AIRFLOW AIRFLOW AIRFLOW AIRFLOW Page AIRFLOW AIRFLOW Page AIRFLOW AIRFLOW Page AIRFLOW Page Page AIRFLOW AIRFLOW GENERAL NOTES FOR FAN PERFORMANCE DATA TABLES Table 25 - Evaporator Fan Motor Specifications Table 24 - Operation Air Quantity LimitsHD60FK651 Table 27 - Fan Rpm at Motor Pulley Settings Fig. 24 - Sensor Locations OAT and MAT Fig. 25 - Temperature Changeover Set PointsTable 28 - EconoMi$er IV Sensor Usage Fig. 26 - EconoMi$er IV Wiring APPROXIMATE DRY BULB TEMPERATURE- F C Fig. 27 - Enthalpy Changeover Set Pointsand LED Locations 13B CTO x OA + TR x RA = TM Table 29 - CO2 Sensor Standard Settings Operating SequenceFig. 30 - Subcooler Operation SERVICE What to do if you smell gasLubrication Fig. 32 - Removing Heat Exchanger CeramicFig. 31 - Typical Gas Heating Section Baffles and ClipsFig. 33 - Evaporator-FanMotor Adjustment Fig. 34 - Evaporator-FanAlignment and AdjustmentCondenser-FanAdjustment Fig Table 30 - Belt Tension AdjustmentFig. 35 - Condenser-FanAdjustment Table 31 - Sensor Temperature/Resistance ValuesGas Valve Adjustment Fig. 37 - Charging Chart - 48PG20Fig. 38 - Charging Chart - 48PG24 Fig. 39 - Charging Chart - 48PG28Fig. 41 - Spark Gap Adjustment Fig. 40 - Gas ValveProtective Devices Table 32 - Altitude CompensationFig. 42 - Typical Low Voltage Control Schematic Fig. 43 - Typical Power Schematic Page Fig. 45 - Typical Component Arrangement - 48PG28 LEGEND FOR FIGTable 33 - Cooling Service Analysis TROUBLESHOOTINGLEGEND TXV - Thermostatic Expansion Valve Table 34 - Gas Heating Service Analysis PROBLEMPoor Flame Characteristics CAUSELEGEND IDM - Induced-DraftMotor Fig. 46 - IGC Control Heating and CoolingIGC - Integrated Gas Unit Controller EconoMi$er IV Troubleshooting Table 35 - IGC Board LED Alarm CodesMIXED-AIRINPUT - To check mixed-airinput Copyright 2005 Carrier Corporation Page UNIT START-UPCHECKLIST TEMPERATURESI. PRE-START-UP II.START-UP