Carrier EW - Manual

Carrier EW

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Table of Contents:

  • Page 2 – Instructions continued on page 12.
  • Page 10 – Table 1 — Physical Data
  • Page 12 – Step 4 — Install Flue Hood —; Flue hood is shipped; Fig. 10 — Flue Hood Location
  • Page 13 – Fig. 11 — Combustion Fan Housing Location
  • Page 15 – Fig. 14 — Field Control Remote Start/Stop
  • Page 16 – Step 8 — Make Electrical Connections
  • Page 17 – Fig. 16 — Control Board Diagram
  • Page 18 – Table 4 — Electrical Data
  • Page 21 – Fig. 17 — Field Power Wiring Connections
  • Page 22 – Fig. 20 — Field Control Thermostat Wiring; Fig. 21 — Field Control Temperature Sensor Wiring
  • Page 23 – Table 5 — CCN Connection Approved Shielded Cables
  • Page 24 – Table 6 — Color Code Recommendations; Step 9 — Make Outdoor-Air Inlet Adjustments
  • Page 26 – Fig. 28 — Adding Foam Strip to Hood Side; Fig. 29 — Adding Foam Strip to Blockoff Baffle
  • Page 27 – Filter Track Assembly; Fig. 32 — Attaching Seal Strip to Filter Cover; Fig. 33 — Differential Enthalpy Control and Sensor
  • Page 28 – Fig. 34 — Wiring Connections for Solid-State; Fig. 35 — Psychrometric Chart for
  • Page 30 – Step 11 — Install All Accessories —; Fig. 38 — Pressure Transducer Locations; Fig. 39 — Motormaster III Baffle Details
  • Page 32 – Power Exhaust —; Table 7 — VFD Supply Air Pressure Set Point; JUMPERS
  • Page 33 – Table 8 — Potentiometer Signal Levels; Crankcase Heater —
  • Page 35 – Table 12 — Fan Performance, 48EJ/EK024-034 — Vertical Discharge Units
  • Page 36 – Table 13 — Fan Performance, 48EJ,EK038,044 — Vertical Discharge Units
  • Page 37 – Table 14 — Fan Performance, 48EJ,EK048 — Vertical Discharge Units
  • Page 38 – Table 15 — Fan Performance — Power Exhaust; Table 16 — Motor Limitations
  • Page 39 – Table 17 — Air Quantity Limits; Filter Replacement —
  • Page 40 – Table 18 — User Defined Set Points
  • Page 42 – Fig. 42 — Heat Interlock Relay Wiring; Fig. 43 — Space Temperature Reset Wiring
  • Page 44 – SERVICE
  • Page 45 – Fig. 46 — Spark Gap Adjustment
  • Page 46 – Fig. 47 — Typical Gas Heating Section
  • Page 47 – Adjustment
  • Page 48 – Main Burners —; For all applications, main burners are; Filter Drier —; Replace whenever refrigerant system is; Protective Devices; COMPRESSOR PROTECTION; Fig. 50 — Belt Tension Adjustment
  • Page 49 – Fig. 55 — Main Burner Removal
  • Page 50 – LEGEND and NOTES for Fig. 56-60 — Typical Wiring Schematics
  • Page 52 – Fig. 57 — Typical VAV 115-v Control Circuit
  • Page 53 – Fig. 58 — Typical CV 115-v Control Circuit
  • Page 54 – Fig. 59 — Typical VAV 24-v Control Circuit
  • Page 55 – Fig. 60 — Typical CV 24-v Control Circuit
  • Page 56 – TROUBLESHOOTING
  • Page 60 – The alarm codes for the IGC control board are shown in; Table 22 — IGC Control Board LED Alarms; Diagnostic LEDs —; Table 23 — Control Board LED Alarms
  • Page 61 – Tables 24-26 show the input and output channel; Table 24 — I/O Channel Designations Base Module — CV
  • Page 62 – PACKAGED SERVICE TRAINING; equipment discussed in this manual. Product programs cover:
  • Page 63 – PRESSURES
  • Page 64 – GENERAL
Loading the manual

Installation, Start-Up and

Service Instructions

CONTENTS

Page

SAFETY CONSIDERATIONS

. . . . . . . . . . . . . . . . . . . 1

INSTALLATION

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-31

Step 1 — Provide Unit Support

. . . . . . . . . . . . . . . 1

• ROOF CURB
• ALTERNATE UNIT SUPPORT

Step 2 — Rig and Place Unit

. . . . . . . . . . . . . . . . . . 2

• POSITIONING
• ROOF MOUNT

Step 3 — Field Fabricate Ductwork

. . . . . . . . . . . . 2

Step 4 — Install Flue Hood

. . . . . . . . . . . . . . . . . . 12

Step 5 — Trap Condensate Drain

. . . . . . . . . . . . 13

Step 6 — Install Gas Piping

. . . . . . . . . . . . . . . . . . 13

Step 7 — Controls Options

. . . . . . . . . . . . . . . . . . 13

• CONSTANT VOLUME APPLICATIONS
• VARIABLE AIR VOLUME (VAV) APPLICATIONS

Step 8 — Make Electrical Connections

. . . . . . . 16

• POWER WIRING
• FIELD POWER SUPPLY
• FIELD CONTROL WIRING

Step 9 — Make Outdoor-Air Inlet

Adjustments

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

• ECONOMIZER
• ECONOMIZER SETTINGS

Step 10 — Position Power Exhaust/Barometric

Relief Hood

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Step 11 — Install All Accessories

. . . . . . . . . . . . 30

START-UP

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31-44

SERVICE

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44-55

TROUBLESHOOTING

. . . . . . . . . . . . . . . . . . . . . . 56-61

START-UP CHECKLIST

. . . . . . . . . . . . . . . . CL-1,CL-2

SAFETY CONSIDERATIONS

Installation and servicing of air-conditioning equipment

can be hazardous due to system pressure and electrical com-
ponents. Only trained and qualified service personnel should
install, repair, or service air-conditioning equipment.

Untrained personnel can perform the basic maintenance

functions of cleaning coils and filters and replacing filters.
All other operations should be performed by trained service
personnel. When working on air-conditioning equipment, ob-
serve precautions in the literature, tags and labels attached
to the unit, and other safety precautions that may apply.

Follow all safety codes. Wear safety glasses and work gloves.

Use quenching cloth for unbrazing operations. Have fire ex-
tinguishers available for all brazing operations.

Before performing service or maintenance operations on
unit, turn off main power switch to unit. Electrical shock
could cause personal injury.

1. Improper installation, adjustment, alteration, serv-

ice, or maintenance can cause property damage, per-
sonal injury, or loss of life. Refer to the User’s
Information Manual provided with this unit for more
details.

2. Do not store or use gasoline or other flammable va-

pors and liquids in the vicinity of this or any other
appliance.

What to do if you smell gas:

1. DO NOT try to light any appliance.
2. DO NOT touch any electrical switch, or use any phone

in your building.

3. IMMEDIATELY call your gas supplier from a neigh-

bor’s phone. Follow the gas supplier’s instructions.

4. If you cannot reach your gas supplier, call the fire

department.

Disconnect gas piping from unit when pressure testing
at pressure greater than 0.5 psig. Pressures greater than
0.5 psig will cause gas valve damage resulting in haz-
ardous condition. If gas valve is subjected to pressure
greater than 0.5 psig, it must be replaced before use. When
pressure testing field-supplied gas piping at pressures of
0.5 psig or less, a unit connected to such piping must be
isolated by closing the manual gas valve(s).

INSTALLATION

Step 1 — Provide Unit Support

1. All panels must be in place when rigging.
2. Unit is not designed for handling by fork truck.

ROOF CURB — Assemble or install accessory roof curb in
accordance with instructions shipped with this accessory. See
Fig. 1 and 2. Install insulation, cant strips, roofing, and counter
flashing as shown. Ductwork can be installed to roof curb
before unit is set in place. Curb should be level. This is nec-
essary to permit unit drain to function properly. Unit level-
ing tolerance is shown in Fig. 1 and 2. Refer to Accessory
Roof Curb Installation Instructions for additional informa-
tion as required. When accessory roof curb is used, unit may
be installed on class A, B, or C roof covering material.

IMPORTANT: The gasketing of the unit to the roof
curb is critical for a watertight seal. Install gasket with
the roof curb as shown in Fig. 1 and 2. Improperly
applied gasket can also result in air leaks and poor unit
performance.

48EJ,EK,EW,EY024-048

Single Package Rooftop Units

Electric Cooling/Gas Heating

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.

Book 1
Tab

1a

PC 111

Catalog No. 564-962

Printed in U.S.A.

Form 48E-5SI

Pg 1

8-97

Replaces: 48E-3SI

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Summary

Page 2 - Instructions continued on page 12.

ALTERNATE UNIT SUPPORT — When the preferred curbor slab mount cannot be used, support unit with sleepers onperimeter, using unit curb support area. If sleepers cannot beused, support long sides of unit (refer to Fig. 3-6) with aminimum number of 4-in. x 4-in. pads spaced as follows:48EJ,EK,EW,EY024-...

Page 10 - Table 1 — Physical Data

Table 1 — Physical Data UNIT 48EJ,EK,EW,EY 024D/E 028D/E 030D/E 034D/E NOMINAL CAPACITY (tons) 20 25 27 30 OPERATING WEIGHT (lb)* Unit Al/Al† (Lo Heat/Hi Heat) 4176/4256 4262/4342 4262/4342 4262/4342 Al/Cu† (Lo Heat/Hi Heat) 4396/4476 4482/4562 4482/4562 4482/4562 Roof Curb (14-in. curb) 365 365 365...

Page 12 - Step 4 — Install Flue Hood —; Flue hood is shipped; Fig. 10 — Flue Hood Location

Table 2 — Evaporator Fan Motor Data (Units with Starting Serial Numbers 4197 and Later) UNIT SIZE 48E MOTOR HP MOTOR SHAFT DIA. (in.) FAN SHAFTSPEED (rpm) MOTOR SHEAVE MOTOR SHEAVE PITCH DIAMETER (in.) BUSHING DIAMETER (in.) FAN SHEAVE FAN SHEAVE PITCH DIAMETER (in.) BUSHING DIAMETER (in.) BELT (QUA...

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