Carrier 48MA/50ME016-040- User Manual
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Table of Contents:
- Page 3 – Fig. 1 — Base Unit Physical Data and Dimensions 48MA Units
- Page 4 – Fig. 2 — Base Unit Physical Data and Dimensions 50ME Units
- Page 5 – Fig. 3 — Roof Curb Detail
- Page 6 – Table 1 — Physical Data
- Page 7 – Fig. 4 — Roof Curb Physical Data and Dimensions 48MA Units
- Page 8 – Fig. 5 — Roof Curb Physical Data and Dimensions 50ME Units
- Page 9 – Condensate Drains —; Fig. 6 — Shipping Shield Locations; Fig. 7 — Field-Fabricated Zone Duct Plenum Detail
- Page 10 – Field Power Supply Wiring —; — Ground; Fig. 9 — Field Power Supply Details
- Page 11 – Table 2 — Unit 48MA Electrical Data
- Page 12 – Table 3 — Unit 50ME Electrical Data; Table 4 — Electric Resistance Heater Data
- Page 13 – Table 5 — Unit 50ME Electrical Application Data
- Page 14 – Field Control Wiring; Fig. 10 — Zone Control Board Component Location
- Page 34 – Fig. 29 — Remote Control Panel Accessory Connections
- Page 35 – Fig. 30 — Humidistat Connections
- Page 37 – Fig. 33 — Spoiler Screw Location
- Page 40 – Fig. 36 — Compressor Capacity Control
- Page 41 – Condenser Fans; Reverse this procedure for reassembly.; Evaporator Fans and Motor; move the fan drive pulley.; Fig. 37 — Motormaster
- Page 42 – Zone Module Transformers —; When replacing these; Optional Economizer —; OPERATION; Optional Exhaust Damper —; When the return air damper is 25% closed, the exhaust; Replacement Parts —; A complete list of replacement; Shutter Position
- Page 43 – Fig. 40 — Economizer and Exhaust Damper Assemblies, Exploded View
- Page 46 – PACKAGED SERVICE TRAINING
Installation, Start-Up
and Service Instructions
CONTENTS
Page
SAFETY CONSIDERATIONS
. . . . . . . . . . . . . . . . . . . 2
INSTALLATION
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-34
General
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Unit Clearances
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Roof Curb
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Roof Openings
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Rigging Unit
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Unit Positioning
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Removing Shipping Shields
. . . . . . . . . . . . . . . . . . 5
Field-Fabricated Ductwork
. . . . . . . . . . . . . . . . . . . . 5
Condensate Drains
. . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Gas Piping (48MA)
. . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Optional Glycol Connections (50ME)
. . . . . . . . . 10
Field Power Supply Wiring
. . . . . . . . . . . . . . . . . . 10
• UNIT COMMON FEED MINIMUM CIRCUIT AMPS
Field Control Wiring
. . . . . . . . . . . . . . . . . . . . . . . . . 14
• ZONE THERMOSTATS
• ZONE MODULE CONNECTIONS
• ACCESSORY REMOTE CONTROL PANEL
Reheat Humidity Control
. . . . . . . . . . . . . . . . . . . . 34
Optional Economizer
. . . . . . . . . . . . . . . . . . . . . . . . 34
Optional Exhaust Damper
. . . . . . . . . . . . . . . . . . . 34
START-UP
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34-39
Evaporator Fan
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Compressor Rail Shipping Bolts
. . . . . . . . . . . . . 34
Refrigerant Valves
. . . . . . . . . . . . . . . . . . . . . . . . . . 34
Zone Module Gas Valves (48MA)
. . . . . . . . . . . . . 34
Gas Heat Lighting Procedure (48MA)
. . . . . . . . . 35
• TO SHUT OFF GAS HEAT
Intermittant Pilots (48MA)
. . . . . . . . . . . . . . . . . . . 35
• ADJUSTMENT
• PRESSURE ADJUSTMENT (NATURAL GAS)
Main Burner Adjustment (48MA)
. . . . . . . . . . . . . 36
• ORIFICE ALIGNMENT
• PRIMARY AIR ADJUSTMENT
Outdoor-Air Thermostat Adjustment
(50ME With Electric Heat)
. . . . . . . . . . . . . . . . . . 36
• UNITS WITH 2-ELEMENT HEATERS
• UNITS WITH 3-ELEMENT HEATERS
Optional Glycol Heating Coils
. . . . . . . . . . . . . . . . 38
Zone Airflow Adjustment
. . . . . . . . . . . . . . . . . . . . 38
Sequence of Operation
. . . . . . . . . . . . . . . . . . . . . 38
• COOLING
• HEATING (48MA)
• HEATING (50ME WITH ELECTRIC HEAT)
• HEATING (50ME WITH GLYCOL HEATING COILS)
• OUTDOOR-AIR DAMPER
SERVICE
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39-43
Cabinet Panels and Grilles
. . . . . . . . . . . . . . . . . . 39
• SIDE PANELS
• TOP PANELS
• HEATER ACCESS PANELS
Cleaning
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
• EVAPORATOR COILS (ZONE COOLING COILS)
AND GLYCOL HEATING COILS
• CONDENSER AND OUTDOOR-AIR COOLING
COILS
• CONDENSATE DRAINS
• INDOOR-AIR FILTERS
• OUTDOOR-AIR INLET SCREENS
• GAS HEATING SECTION
• COMBUSTION AIR FAN
Airflow Switches
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
• INDOOR AIRFLOW SWITCH (AFS1)
• COMBUSTION AIRFLOW SWITCH (AFS2)
Service Switch
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Time Guard
T
Control Circuit
. . . . . . . . . . . . . . . . . 39
Capacity Control Pressure Switches (CCP)
(2-Compressor Units Only)
. . . . . . . . . . . . . . . . 39
Compressor Oil
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
• TO ADD OR REMOVE OIL
Compressor Capacity Control Unloader(s)
. . . . 40
• CONTROL SET POINT
• PRESSURE DIFFERENTIAL
Crankcase Heater(s)
. . . . . . . . . . . . . . . . . . . . . . . . . 40
Refrigerant Charge
. . . . . . . . . . . . . . . . . . . . . . . . . . 40
• NO CHARGE
• LOW CHARGE
Head Pressure Control
. . . . . . . . . . . . . . . . . . . . . . 40
• MOTORMASTER
t
HEAD PRESSURE CONTROL
DEVICE
• FAN CYCLING PRESSURESTAT
Condenser Fans
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
• ADJUSTMENT
• FAN MOTOR REMOVAL
• LUBRICATION
Evaporator Fans and Motor
. . . . . . . . . . . . . . . . . . 41
• MOTOR REMOVAL
• FAN SHAFT BEARING REMOVAL
• FAN SPEED ADJUSTMENT
• PULLEY REMOVAL
• PULLEY ALIGNMENT
• BELT TENSION ADJUSTMENT
• LUBRICATION
Forced-Draft Blower (48MA)
. . . . . . . . . . . . . . . . . 42
• LUBRICATION
• AIR SHUTTER ADJUSTMENT
Zone Module Transformers
. . . . . . . . . . . . . . . . . . 42
Optional Economizer
. . . . . . . . . . . . . . . . . . . . . . . . 42
• THERMOSTAT SETTINGS
• DAMPER POSITION
• OPERATION
Optional Exhaust Damper
. . . . . . . . . . . . . . . . . . . 42
Replacement Parts
. . . . . . . . . . . . . . . . . . . . . . . . . . 42
START-UP CHECKLIST
. . . . . . . . . . . . . . . . . . . . . CL-1
48MA/50ME016-040
Combination Multizone Heating/Cooling Units
Gas, Electric, or Glycol Heat
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1
1
Tab
1c 1d
PC 111
Catalog No. 564-840
Printed in U.S.A.
Form 48MA/50ME-3SI
Pg 1
4-96
Replaces: 48MA/50ME-1SI
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Summary
CONDENSER SECTION AIRFLOW CONN — Connection NOTES:1. Space required for service and airflow all around and above unit is 36 inches. 2. For additional information see Fig. 4.3. Center of gravity is within 6 in. radius of geo- metric center of unit. 4. Maximum allowable pitch of unit is 1 ⁄ 2 in. per ...
CONDENSER SECTION AIRFLOW CONN — Connection NOTES:1. Space required for service and airflow all around and above unit is 36 inches. 2. For additional information see Fig. 5.3. Center of gravity is within 6 in. radius of geo- metric center of unit. 4. Maximum allowable pitch of unit is 1 ⁄ 2 in. per ...
Rigging Unit — Inspect unit for shipping damage, and file any damage claim immediately with transportationcompany. Lift unit with cables and spreader bars, using lifting brack- ets provided (Fig. 1 and 2). Lift one unit at a time, keep unitupright, and do not drop. Unit weights are given in Table 1....
