Carrier 48MA/50ME016-040 - Manual

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
ா
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
௡ 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