Carrier 48AJ- User Manual
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Table of Contents:
- Page 2 – LEGEND; PLUG LOCATION REFERENCE
- Page 4 – Gas Heat Unit Operation —
- Page 6 – INPUT/OUTPUT CHANNEL DESIGNATIONS — STAGED GAS HEAT CONTROL BOARD
- Page 7 – INPUT/OUTPUT CHANNEL DESIGNATIONS — CONTROLS EXPANSION BOARD
- Page 27 – Fig. 21 — Space Temperature Averaging Wiring
- Page 28 – Fig. 22 — Electric Heater Power Diagrams
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-56480004-01
Printed in U.S.A.
Form 48/50A-4W
Pg 1
7-07
Replaces: 48/50A-2W
Book 1
1
Tab
1a 1b
Wiring Diagrams
UNITS WITH STARTING SERIAL NUMBER 1307UXXXXX AND LATER
INDEX
ACCESSORIES
NOTE: Accessory wiring is shown on the unit wiring diagrams. Refer
to the appropriate drawing for accessory wiring.
ELECTRIC HEAT POWER DIAGRAMS
NOTE: All power leads connect to (single) TB7 power terminal block
– 2 or 3 conductors per terminal.
TYPE
UNIT
NUMBER
FIG. NO.
Component Arrangement
48/50AJ,AK,AW,AY020-035
48EJ502489
1
48/50AJ,AK,AW,AY036-060
48EJ503652
2
Power Schematic
48/50AJ,AK,AW,AY020-027
48EJ503085
3
48/50AJ,AK,AW,AY030-035
48EJ503084
4
48/50AJ,AK,AW,AY036-041
48EJ503653
5
48/50AJ,AK,AW,AY050
48EJ503082
6
48/50AJ,AK,AW,AY051,060
48EJ503654
7
Main Control Box Circuit
48/50AJ,AK,AW,AY020-060
48EJ503075
8
Auxiliary Control Box Wiring
48/50AJ,AK,AW,AY020-060
48EJ503076
9
Controls Expansion
Board Wiring
48/50AJ,AK,AW,AY020-060
48EJ503086
10
Gas Heat Control Circuit
(2-Stage Heat)
48AJ,AK,AW,AY020-050
48EJ503079
11
48AJ,AK,AW,AY051
48EJ503679
12
48AJ,AK,AW,AY060
48EJ503077
13
Gas Heat Control Circuit
(Staged Gas Heat)
48AJ,AW020-050
48EJ502488
14
48AJ,AW051
48EJ503680
15
48AJ,AW060
48EJ503078
16
Electric Heat Control Circuit
50AJ,AK,AW,AY020-050
48EJ503080
17
50AJ,AK,AW,AY051,060
48EJ503655
18
ACCESSORY
UNIT
FIG. NO.
Motormaster® V Low Ambient
Controller
48/50AJ,AK,AW,AY020-035
19
48/50AJ,AK,AW,AY036-060
20
Space Sensor Temperature
Averaging
48/50AJ,AK,AW,AY020-060
21
Thermostat, Remote Economizer Position Override, Remote Economizer Minimum Position Set
Point, Remote 4 to 20 mA Economizer Position, and Space IAQ Sensor
48/50AJ,AK,AW,AY020-060
8
Outdoor Enthalpy Changeover Sensor and Differential Enthalpy Changeover Sensor
48/50AJ,AK,AW,AY020-060
9
Outdoor Air Quality Sensor, Remote Supply Air Set Point, Demand Limit Controller, Outdoor
Inlet CFM Sensor, Fan Status Switch, Demand Limit-Redline, Demand Limit-Loadshed, Fire
Pressurization, Fire Evacuation, Fire Smoke Purge, and IAQ Override Switch
48/50AJ,AK,AW,AY020-060
10
UNIT SIZES
ELEC CHARACTERISTICS
NOMINAL kW
FIG. NO.
QTY PER UNIT
Lo Heat
Hi Heat
020-050
208/230-3-60
36
72
22
2
460-3-60
380-3-60
400-3-50
36
24
27
72
49
54
22
2
575-3-60
36
72
22
2
051,060
208/230-3-60
54
108
22
3
460-3-60
380-3-60
400-3-50
54
37
41
108
74
82
22
3
575-3-60
54
108
22
3
48/50AJ,AK,AW,AY020-060
Single Package Rooftop
Gas Heating/Electric Cooling and Electric Cooling Units
with
COMFORT
LINK™ Controls
50/60 Hz
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Other Manuals for Carrier 48AJ
Summary
2 LEGEND AND NOTES FOR FIG. 1-18 LEGEND BP — Building Pressure C — Contactor, Compressor CAP — Capacitor CB — Circuit Breaker CCB — Control Circuit Breaker CCH — Crankcase Heater CCN — Carrier Communication Network ® CEM — Controls Expansion Module COMP — Compressor Motor CS — Compressor Safety CSB ...
4 If the control is connected to a ComfortID™ system, the room terminals are equipped with microprocessor controls that give commands to the base module. If linkage is active, the control module will replace local Comfort Link™ set points and occupancy data with linkage supplied data. If Temperature...
6 INPUT/OUTPUT CHANNEL DESIGNATIONS — ECONOMIZER CONTROL BOARD (ECB1) INPUT/OUTPUT CHANNEL DESIGNATIONS — VAV CONTROL BOARD (ECB2) INPUT/OUTPUT CHANNEL DESIGNATIONS — STAGED GAS HEAT CONTROL BOARD POINT NAME POINT DESCRIPTION I/O POINT NAME PLUG AND PIN REFERENCE SIGNAL PIN(S) PORT STATE INPUTS RMTI...
