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TYPE
Component Arrangement
Power Schematic
Main Control Box Circuit
Auxiliary Control Box Wiring
Controls Expansion
Board Wiring
Gas Heat Control Circuit
(2-Stage Heat)
Gas Heat Control Circuit
(Staged Gas Heat)
Electric Heat Control Circuit
ACCESSORY
Motormaster® V Low Ambient Controller
Space Sensor Temperature Averaging
Thermostat
Remote Economizer Position Override
Remote Economizer Minimum Position Set Point
Remote 4 to 20 mA Economizer Position
Space IAQ Sensor
Outdoor Enthalpy Changeover Sensor
Differential Enthalpy Changeover Sensor
Outdoor Air Quality Sensor
Remote Supply Air Set Point
Demand Limit Controller
Fan Status Switch
Demand Limit
Fire Pressurization
Fire Evacuation
Fire Smoke Purge
IAQ Override Switch
NOTE: Accessory wiring is shown on the unit wiring diagrams. Refer
to the appropriate drawing for accessory wiring.
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-56480002-01
Gas Heating/Electric Cooling and Electric Cooling Units
Wiring Diagrams
INDEX
UNIT
48/50A2,A3,A4,A5020-035
48/50A2,A3,A4,A5040-060
48/50A2,A3,A4,A5020-050
48/50A2,A3,A4,A5060 RTPF
48/50A2,A3,A4,A5060 MCHX
48/50A2,A3,A4,A5020-060
48/50A2,A3,A4,A5020-060
48/50A2,A3,A4,A5020-060
48A2,A3,A4,A5020-050
48A2,A3,A4,A5060
48A2,A3,A4,A5020-050
48A2,A3,A4,A5060
50A2,A3,A4,A5020-050
50A2,A3,A4,A5060
ACCESSORIES
Printed in U.S.A.
48/50A2,A3,A4,A5020-060
Single Package Rooftop
with COMFORTLINK™ Controls
NUMBER
48EJ502489
48EJ503652
50EJ500470
50EJ500469
50EJ500420
50EJ500440
48EJ503076
48EJ503086
48EJ503079
48EJ503679
48EJ502488
48EJ503680
48EJ503080
48EJ503655
UNIT
48/50A2,A3,A4,A5020-035
48/50A2,A3,A4,A5040,050 AND 060 RTPF Units
48/50A2,A3,A4,A5060 MCHX Units
48/50A2,A3,A4,A5020-060
48/50A2,A3,A4,A5020-060
48/50A2,A3,A4,A5020-060
48/50A2,A3,A4,A5020-060
Form 48/50A-3W
Pg 1
WEATHERMAKER
FIG. NO.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
FIG. NO.
15
16
17
18
6
7
8
508
4-08
Replaces: New
®
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Summarization of Contents
Sequence of Operation
Constant Volume (CV) Unit Control Methods
Describes unit operation with a thermostat and space sensor control, including economizer use.
Variable Air Volume (VAV) Control Logic
Explains VAV unit operation, mode determination, and return air control strategies.
Gas Heat Unit Operation Details
Gas Heat System Components and Safeties
Describes the components, IGC boards, and safeties for gas heating systems.
Indoor Air Quality (IAQ) Functionality
IAQ Ventilation Control Strategy
Details IAQ function for demand-based ventilation using CO2 and OAQ sensors.
Input/Output Channel Designations - Main Base Board (MBB)
MBB Input Signal Assignments
Lists and describes input signals for the MBB, covering sensors and thermostat connections.
MBB Output Signal Assignments
Lists and describes output signals from the MBB, including control relays for components.
Input/Output Channel Designations - Economizer Control Board (ECB1)
ECB1 Input Signal Assignments
Details ECB1 input channels for occupancy, economizer enable, and humidity sensors.
ECB1 Output Signal Assignments
Details ECB1 output channels for analog signals, economizer commands, and power exhaust.
Input/Output Channel Designations - VAV Control Board (ECB2)
ECB2 Input Signal Assignments
Lists ECB2 input channels for static pressure and supply fan status.
ECB2 Output Signal Assignments
Details ECB2 output channels for supply fan speed and minimum load valve control.
Input/Output Channel Designations - Staged Gas Heat Control Board
Staged Gas Heat Board Input Assignments
Details input signals for the staged gas heat board, including leaving air temperatures.
Staged Gas Heat Board Output Assignments
Details output signals for heat stages and relays on the gas heat control board.
Input/Output Channel Designations - Controls Expansion Board
Controls Expansion Board Input Assignments
Lists discrete and analog inputs for the controls expansion board, including IAQ and fire functions.
Controls Expansion Board Output Assignments
Lists output signals from the controls expansion board, covering fire functions and IAQ control.
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