SAFETY CONSIDERATIONS
CONTENTS
INSTALLATION Step 1 — Provide Unit Support
Step 11 — Position Power Exhaust/Barometric
Step 4 — Make Unit Duct Connections
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NOTES
Fig. 5 - Base Unit Dimensions - 48AJ,AK020-030
Fig. 6 — Base Unit Dimensions — 48AJ,AK035-050
Fig. 7 — Base Unit Dimensions — 48AJ,AK060
Fig. 8 — Base Unit Dimensions — 48AW,AY020-030
Fig. 9 — Base Unit Dimensions — 48AW,AY035-050
Fig. 10 — Base Unit Dimensions — 48W,AY060
Fig. 11 — Base Unit Dimensions — 48EJ,EK024-034
Fig. 12 — Base Unit Dimensions — 48EJ,EK038-048
Fig. 13 — Base Unit Dimensions — 48EJ,EK054-068
Fig. 14 — Base Unit Dimensions — 48EW,EY024-034
Fig. 15 — Base Unit Dimensions — 48EW,EY038-048
Fig. 16 — Base Unit Dimensions — 48EW,EY054-068
Fig. 17 — Rigging Information
Fig. 17 — Rigging Information cont
Table 1A — Physical Data — 48AJ,AK,AW,AY Units
UNIT 48AJ,AK,AW,AY
Table 1B — Physical Data — 48EJ,EK,EW,EY Units
UNIT 48EJ,EK,EW,EY
UNIT 48EJ,EK,EW,EY
48EJ,EK,EW,EY Units
Table 2 — Operating Weights
48AJ,AK,AW,AY Units
Fig. 19 — Air Distribution — Thru-the-Side
Table 3 — Evaporator Fan Motor Data
Fig. 18 — Air Distribution — Thru-the-Bottom
Step 5 — Install Flue Hood
Table 4 — 48A,E Series Staged Gas Implementation
Fig. 23 — Field Gas Piping
Table 6 - Thermistor Designations
Fig. 24 — Supply-AirThermistor Connections
Fig. 26 — Field Control Remote Start/Stop
Fig. 25 — Indoor Air Quality Sensor Configuration
Step 9 - Make Electrical Connections
Fig. 27 — Control Board Diagram
Table 7 — Electrical Data — 48AJ,AK,AW,AY Units
UNIT SIZE
30.8/28.0
236.3/230.9
Table 8 — Electrical Data — 48EJ,EK,EW,EY Units
30.8
0.96
UNIT
Fig. 28 - Field Power Wiring Connections
LEGEND
Thermostat Wiring CV Only- Install a Carrier-approvedaccessory thermostat assembly per current price pages according to the installation instructions included with the ac- cessory or these instructions. Locate the thermostat on a solid interior wall in the conditioned space to sense the average temperature
LEGEND
Fig. 33 — Field Control Temperature Sensor
Fig. 32 — Field Control Thermostat Wiring
Wiring CV or VAV Units
Table 9 — CCN Connection Approved Shielded Cables
Fig. 35 — Field HIR Heat Interlock Relay Wiring
Step 10 — Make Outdoor-AirInlet Adjustments
Fig. 34 - Space Temperature Averaging Wiring
Right Side/Center Economizer Hood Shown
Fig. 37 - Economizer Hood Assembly
Fig. 36 — Adding Seal Strip to Top of Hood Sides
Mounting Flange
Fig. 38 — Adding Seal Strip to Sides of Hood Top
Fig. 39 — Adding Seal Strip to Back of Hood Top
Fig. 40 — Adding Foam Strip to Cross Member
Filter Track Assembly
Attached to Filter Track Assembly
Fig. 43 - Mounting Angle Without Tabs
Fig. 44 — Mounting Angle With Tabs Attached to
Save screws
Fig. 47 - Wiring Connections for Solid-State
Enthalpy Control HH57AC077
CONTROL
Fig. 49 - Economizer Details
CONTROL POINT
CURVE
48AJ,AK,AW,AY060 and 48EJ,EK,EW,EY054-068
Fig. 51 - Pressure Transducer Locations
48AJ,AK,AW,AY020-030and 48EJ,EK,EW,EY024-034
Fig. 52 - Motormaster III Control Baffle Details
Fig. 53A — Motormaster III Sensor Location
48AJ,AK,AW,AY035 and 48EJ,EK,EW,EY038
Fig. 53B — Motormaster III Sensor Location
Fig. 53C — Motormaster III Sensor Location
48AJ,AK,AW,AY040, 050 and 48EJ,EK,EW,EY048
Fig. 54 — Side Return Air Conversion
Step 13 — Field Modifications
START-UP
Fig. 56 — Wiring Field-SuppliedUnloaders for
Constant Volume Units
Fig. 57 — Toshiba TOSVERT130-E3VFD
Factory-InstalledJumpers
13.Replace jumper across terminals ST and CC
13.Replace jumper across terminals R and CC
Optional Field Wiring
LEGEND Typical Factory Wiring
See below for building pressure to signal level
Table 17 — DIP Switch Configuration
Table 18 — DIP Switch Factory Settings
AIRFLOW
AIRFLOW
AIRFLOW
1.06
2.15
3.18
4.81
AIRFLOW
AIRFLOW
AIRFLOW
AIRFLOW
AIRFLOW
AIRFLOW
Table 34 — Air Quality Limits
Table 33 — Motor Limitations
Sequence of Operation
Table 36 - Software Control Link Points
Table 35 — User Defined Set Points
The Time Guard function maintains a minimum off time of 5 minutes, a minimum ON time of 10 seconds, and a minimum delay before starting the second compressor of 10 seconds
Fig. 59 — Heat Interlock Relay Wiring
Table 38 — Stage Gas System Inputs/Outputs
Table 37 — Staged Gas System Components
Table 39 — Navigator Display Menu Structure
Fig. 60 — Navigator Display
Operation and Controlling Factors
Fig. 61 — Space Temperature Reset Wiring
Table 40 — Occupied Heat and Morning Warm-Up
Fig. 62 - Field-SuppliedSmoke Detector Wiring
Units with 2 Compressors
Table 41 — Smoke Control Modes
Table 42 — Cooling Capacity Staging Table, CV
Fig. 63 — Door Latch
SERVICE
Fig. 64 — Spark Gap Adjustment
Fig. 66 — Gas Heat Section Details
Fig. 65 — Typical Gas Heating Section
Fig. 68 — Evaporator Fan Coupling
Fig. 67 — Evaporator-FanAlignment and Adjustment
Lubrication
Belt Tension Adjustment — To adjust belt tension
Evaporator Fan Service and Replacement
Evaporator-FanMotor Replacement
Condenser-FanAdjustment
Fig. 71 — Cooling Charging Chart
Gas Valve Adjustment
Fig. 72 — Cooling Charging Chart
48EJ,EK,EW,EY024-034
Fig. 74 — Cooling Charging Chart
Fig. 73 — Cooling Charging Chart
48EJ,EK,EW,EY054-068
48AJ,AK,AW,AY020-060
Protective Devices
LEGEND for Fig. 77-83— Typical Wiring Schematics
TABLE 1A
Fig. 78 — Typical 48EK VAV 24-VControl Circuit
Fig. 79 — Typical CV 24-VControl Circuit
Fig. 80 — Typical 48EK VAV 115-VControl Circuit
Fig. 81 — Typical 48EJ CV 115-VControl Circuit
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TROUBLESHOOTING
HPS - High-PressureSwitch
FPS — Freeze Protection Switch
LPS - Low-PressureSwitch
LEGEND
compressor
LPS — Low-PressureSwitch
LEGEND FPS — Freeze Protection Switch
HPS — High-PressureSwitch
8-Pass
LPS — Low-PressureSwitch
LEGEND FPS — Freeze Protection Switch
HPS — High-PressureSwitch
TXV — Thermostatic Expansion Valve
LEGEND HPS — High-PressureSwitch
LPS — Low-PressureSwitch
LPS — Low-PressureSwitch
HPS - High-PressureSwitch
LEGEND
TXV — Thermostatic Expansion Valve
TXV — Thermostatic Expansion Valve
LEGEND HPS — High-PressureSwitch
LPS — Low-PressureSwitch
TXV — Thermostatic Expansion Valve
LEGEND HPS — High-PressureSwitch
LPS — Low-PressureSwitch
IGC — Integrated Gas Unit Controller
Fig. 94 — IGC Control Heating and Cooling
LEGEND IDM — Induced-DraftMotor
Table 45 — Control Board LED Alarms
Table 44 - IGC Control Board LED Alarms
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CALL FOR FREE CATALOG
SERVICE TRAINING
TEMPERATURES
START-UPCHECKLIST
PRE-START-UP
ELECTRICAL
GENERAL
