---48ES A |
Packaged Air Conditioner |
Comfort t 13 SEER Single--- |
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and Gas Furnace System with Puron→ (R---410A) Refrigerant |
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Single and Three Phase |
60) |
2---5 Nominal Tons (Sizes 24--- |
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Installation Instructions
NOTE: Read the entire instruction manual before starting the installation.
NOTE: Installer: Make sure the Owner’s Manual and Service Instructions are left with the unit after installation.
TABLE OF CONTENTS
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PAGE |
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . |
. . . 1 |
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . . 2 |
RECEIVING AND INSTALLATION . . . . . . . . . . . . . . . . . |
2-13 |
Check Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . . 2 |
Identify Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . . 2 |
Inspect Shipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . . 2 |
Provide Unit Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . . 2 |
Roof Curb . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . . 2 |
Slab Mount . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . . 2 |
Field Fabricate Ductwork . . . . . . . . . . . . . . . . . . . . . . . . . |
. . . 6 |
Provide Clearances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . . 6 |
Rig and Place Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . . 6 |
Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . . 6 |
Rigging/Lifting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . . 6 |
Connect Condensate Drain . . . . . . . . . . . . . . . . . . . . . . . . |
. . . 9 |
Install Flue Hood . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . . 9 |
Install Gas Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . . 9 |
Install Duct Connections . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . 10 |
Configuring Units for Downflow (Vertical) |
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Discharge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . 10 |
Install Electrical Connections . . . . . . . . . . . . . . . . . . . . . . |
. . 12 |
High-Voltage Connections . . . . . . . . . . . . . . . . . . . . . . |
. . 12 |
Special Procedures for 208-V Operation . . . . . . . . . . . . |
. . 12 |
Control Voltage Connections . . . . . . . . . . . . . . . . . . . . . |
. . 12 |
Standard Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . 12 |
Heat Anticipator Setting . . . . . . . . . . . . . . . . . . . . . . . . |
. . 13 |
Transformer Protection . . . . . . . . . . . . . . . . . . . . . . . . . |
. . 13 |
PRE-START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . 13 |
START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
14-22 |
Check for Refrigerant Leaks . . . . . . . . . . . . . . . . . . . . . . . |
. . 13 |
Start-Up Heating & Make Adjustments . . . . . . . . . . . . . . |
. . 14 |
Check Heating Control . . . . . . . . . . . . . . . . . . . . . . . . . |
. . 14 |
Check Gas Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . 14 |
Adjust Gas Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . 15 |
Check Burner Flame . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . 16 |
Normal Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . 20 |
Airflow and Temperature Rise . . . . . . . . . . . . . . . . . . . . |
. . 20 |
Heating Sequence of Operation . . . . . . . . . . . . . . . . . . . |
. . 20 |
Limit Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . 20 |
Rollout Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . 20 |
Start-Up Cooling & Make Adjustments . . . . . . . . . . . . . . |
. . 20 |
Checking Cooling Control Operation . . . . . . . . . . . . . . |
. . 20 |
Checking & Adjusting Refrigerant Charge . . . . . . . . . . |
. . 20 |
Indoor Airflow and Airflow Adjustments . . . . . . . . . . . |
. . 21 |
Continuous Fan Operation . . . . . . . . . . . . . . . . . . . . . . |
. . 21 |
Cooling Sequence of Operation . . . . . . . . . . . . . . . . . . . |
. . 22 |
MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
29-30 |
Air Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . 29 |
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A09034 |
Fig. 1 - Unit 48ES-A |
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(Low NOx Model Available) |
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Indoor Blower and Motor . . . . . . . . . . . . . . . . . . . . . |
. . . . 29 |
Induced Draft (Combustion Air) Blower . . . . . . . . . . |
. . . . 30 |
Flue Gas Passageways . . . . . . . . . . . . . . . . . . . . . . . . |
. . . . 30 |
Limit Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . . . 30 |
Burner Ignition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . . . 30 |
Main Burners . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . . . 30 |
Removal of Gas Train . . . . . . . . . . . . . . . . . . . . . . . . |
. . . . 30 |
Outdoor Coil, Indoor Coil, & Condensate Drain Pan |
. . . . 30 |
Outdoor Fan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . . . 31 |
Electrical Controls and Wiring . . . . . . . . . . . . . . . . . |
. . . . 32 |
Refrigerant Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . . . 32 |
Gas Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . . . 32 |
Evaporator Airflow . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . . . 32 |
Puron Items . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . . . 33 |
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . |
. . . . 33 |
START-UP CHECKLIST . . . . . . . . . . . . . . . . . . . . . . . . |
. . . . 33 |
SAFETY CONSIDERATIONS
Improper installation, adjustment, alteration, service maintenance, or use can cause explosion, fire, electrical shock, or other conditions which may cause death, personal injury, or property damage. Consult a qualified installer, service agency, or your distributor or branch for information or assistance. The qualified installer or agency must use factory-authorized kits or accessories when modifying this product. Refer to the individual instructions packaged with the kits or accessories when installing.
Follow all safety codes. Wear safety glasses, protective clothing, and work gloves. Have a fire extinguisher available. Read these instructions thoroughly and follow all warnings or cautions included in literature and attached to the unit. Consult local building codes, the current editions of the National Fuel Gas Code (NFGC) NFPA 54/ANSI Z223.1, and the National Electrical Code (NEC) NFPA 70.
In Canada refer to the current editions of the National Standards of Canada CAN/CSA-B149.1 and .2 Natural Gas and Propane Installation codes, and Canadian Electrical Code CSA C22.1
1
48ES--A
Recognize safety information. This is the safety-alert symbol 
. When you see this symbol on the unit and in instructions or manuals, be alert to the potential for personal injury. Understand these signal words: DANGER, WARNING, and CAUTION. These words are used with the safety-alert symbol. DANGER identifies the most serious hazards which will result in severe personal injury or death. WARNING signifies hazards which could result in personal injury or death. CAUTION is used to identify unsafe practices which may result in minor personal injury or product and property damage. NOTE is used to highlight suggestions which will result in enhanced installation, reliability, or operation.
!WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury or death.
Before installing or servicing system, always turn off main power to system and install lockout tag. There may be more than one disconnect switch. Turn off accessory heater power switch if applicable.
!WARNING
FIRE, EXPLOSION, ELECTRICAL SHOCK AND CARBON MONOXIDE POISONING HAZARD
Failure to follow this warning could result in personal injury or unit damage.
A qualified installer or agency must use only factory-authorized kits or accessories when modifying this product.
!CAUTION
CUT HAZARD
Failure to follow this caution may result in personal injury.
When removing access panels (see Fig. 20) or performing maintenance functions inside your unit, be aware of sharp sheet metal parts and screws. Although special care is taken to reduce sharp edges to a minimum, be extremely careful when handling parts or reaching into the unit.
INTRODUCTION
The 48ES-A unit (see Fig. 1) is a fully self-contained, combination Category I gas heating/electric cooling unit designed for outdoor installation (See Fig. 3 and 4 for unit dimensions). All unit sizes have return and discharge openings for both horizontal and downflow configurations, and are factory shipped with all downflow duct openings covered. Units may be installed either on a rooftop or on a cement slab. (See Fig. 5 for roof curb dimensions).
Models with an N in the fifth position of the model number are dedicated Low NOx units designed for California installations. These models meet the California maximum oxides of nitrogen (NOx) emissions requirements of 40 nanograms/joule or less as shipped from the factory and must be installed in California Air Quality Management Districts or any other regions in North America where a Low NOx rule exists.
NOTE: Low NOx requirements apply only to natural gas
installations.
RECEIVING AND INSTALLATION
Step 1 — Check Equipment
Identify Unit
The unit model number and serial number are stamped on the unit information plate. Check this information against shipping papers.
Inspect Shipment
Inspect for shipping damage before removing packaging materials. If unit appears to be damaged or is torn loose from its anchorage, have it examined by transportation inspectors before removal. Forward claim papers directly to transportation company. Manufacturer is not responsible for any damage incurred in transit. Check all items against shipping list. Immediately notify the nearest equipment distribution office if any item is missing. To prevent loss or damage, leave all parts in original packages until installation.
If the unit is to be mounted on a curb in a downflow application, review Step 9 to determine which method is to be used to remove the downflow panels before rigging and lifting into place. The panel removal process may require the unit to be on the ground.
Step 2 — Provide Unit Support
IMPORTANT: The unit must be secured to the curb by installing screws through the bottom of the curb flange and into the unit base rails. When installing large base units onto the common curb, the screws must be installed before allowing the full weight of the unit to rest on the curb. A minimum of six screws are required for large base units. Failure to secure unit properly could result in an unstable unit. See Warning near Rigging/Lifting information and accessory curb instructions for more details.
For hurricane tie downs, contact distributor for details and PE (Professional Engineering) Certificate if required.
Roof Curb
Install accessory roof curb in accordance with instructions shipped with curb (See Fig. 5). Install insulation, cant strips, roofing, and flashing. Ductwork must be attached to curb.
IMPORTANT: The gasketing of the unit to the roof curb is critical for a water tight seal. Install gasketing material supplied with the roof curb. Improperly applied gasketing also can result in air leaks and poor unit performance.
Curb should be level to within 1/4 in. (6 mm). This is necessary for unit drain to function properly. Refer to accessory roof curb installation instructions for additional information as required.
Installation on older “G” series roof curbs.
Two accessory kits are available to aid in installing a new “G” series unit on an old “G” roof curb.
1.Accessory kit number CPADCURB001A00, (small chassis) and accessory kit number CPADCURB002A00, (large chassis) includes roof curb adapter and gaskets for the perimeter seal and duct openings. No additional modifications to the curb are required when using this kit.
2.An alternative to the adapter curb is to modify the existing curb by removing the outer horizontal flange and use accessory kit number CPGSKTKIT001A00 which includes spacer blocks (for easy alignment to existing curb) and gaskets for the perimeter seal and duct openings. This kit is used when existing curb is modified by removing outer horizontal flange.
!CAUTION
UNIT/STRUCTURAL DAMAGE HAZARD
Failure to follow this caution may result in property damage.
Ensure there is sufficient clearance for saw blade when cutting the outer horizontal flange of the roof curb so there is no damage to the roof or flashing.
Slab Mount
Place the unit on a solid, level concrete pad that is a minimum of 4 in. (102 mm) thick with 2 in. (51 mm) above grade. The slab should extend approximately 2 in. (51 mm) beyond the casing on all 4 sides of the unit. (See Fig. 2.) Do not secure the unit to the slab except when required by local codes.
2
48ES--A
A09448
Fig. 2 - 48ES-A24-36 Unit Dimensions
3
48ES--A
A09449
Fig. 3 - 48ES-A42-60 Unit Dimensions
4
HVAC unit |
HVAC unit |
base rails |
basepan |
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Sealing |
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Gasket |
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Roofcurb |
Anchor screw |
Wood nailer* |
Flashing field |
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supplied |
Roofcurb* |
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Insulation |
Roofing material |
(field supplied) |
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field supplied |
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Cant strip |
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field supplied |
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*Provided with roofcurb
A09090
B
G C
F |
H |
A
D
SMALL/COMMON CURB
Dashed lines show cross support location for large basepan units.
E
A09413
ROOF CURB DETAIL
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B |
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C |
SMALL |
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SUPPLY |
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G |
BASE |
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AIR |
UNIT |
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F A |
H |
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LARGE |
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RETURN |
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BASE |
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E |
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AIR |
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D |
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UNIT PLACEMENT ON |
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COMMON CURB |
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A09094 |
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LARGE CURB |
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A09415 |
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SMALL OR LARGE BASE UNIT |
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A09414 |
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A |
B (small |
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C |
D |
E |
F |
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UNIT |
CATALOG |
common |
B (large base) |
G |
H |
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IN. |
IN. |
IN. |
IN. |
IN. |
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SIZE |
NUMBER |
base) |
IN. (mm)* |
IN. (mm) |
IN. (mm) |
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(mm) |
(mm) |
(mm) |
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IN. (mm)* |
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Small |
CPRFCURB010A00 |
11 (279) |
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32.4 |
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or |
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10 (254) |
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30.6 (778) |
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CPRFCURB011A00 |
14 (356) |
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47.8 |
(822) |
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Large |
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14 (356) |
16 (406) |
2.7 (69) |
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46.1 (1170) |
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CPRFCURB012A00 |
11 (279) |
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(1214) |
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43.9 |
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Large |
14 (356) |
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42.2 (1072) |
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CPRFCURB013A00 |
14 (356) |
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(1116) |
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* Part Numbers CPRCURB010A00 and CPRCURB011A00 can be used on both small and large basepan units. The cross supports must be located based on whether the unit is a small basepan or a large basepan.
NOTES:
1.Roof curb must be set up for unit being installed.
2.Seal strip must be applied, as required, to unit being installed.
3.Roof curb is made of 16-gauge steel.
4.Attach ductwork to curb (flanges of duct rest on curb).
5.Insulated panels: 1-in. (25.4 mm) thick fiberglass 1 lb. density.
Fig. 4 - Roof Curb Dimensions
5
48ES--A
48ES--A
OPTIONAL |
OPTIONAL |
RETURN |
SUPPLY |
AIR |
AIR |
OPENING |
OPENING |
2˝ |
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(50.8mm) |
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EVAP. COIL |
COND. COIL |
A07926
Fig. 5 - Slab Mounting Details
Step 3 — Field Fabricate Ductwork
Secure all ducts to roof curb and building structure on vertical discharge units. Do not connect ductwork to unit. For horizontal applications, unit is provided with flanges on the horizontal openings. All ductwork should be secured to the flanges. Insulate and weatherproof all external ductwork, joints, and roof openings with counter flashing and mastic in accordance with applicable codes.
Ducts passing through an unconditioned space must be insulated and covered with a vapor barrier.
If a plenum return is used on a vertical unit, the return should be ducted through the roof deck to comply with applicable fire codes.
Read unit rating plate for any required clearances around ductwork. Cabinet return-air static shall not exceed -.25 IN. W.C.
Step 4 — Provide Clearances
The required minimum operating and service clearances are shown in Fig. 3 and 4. Adequate combustion, ventilation and condenser air must be provided.
IMPORTANT: Do not restrict outdoor airflow. An air restriction at either the outdoor-air inlet or the fan discharge may be detrimental to compressor life.
The condenser fan pulls air through the condenser coil and discharges it through the top grille. Be sure that the fan discharge does not recirculate to the condenser coil. Do not locate the unit in either a corner or under an overhead obstruction. The minimum clearance under a partial overhang (such as a normal house overhang) is 48-in. (1219 mm) above the unit top. The maximum horizontal extension of a partial overhang must not exceed 48-in. (1219 mm).
Do not place the unit where water, ice, or snow from an overhang or roof will damage or flood the unit. Do not install the unit on carpeting or other combustible materials. Slab-mounted units should be at least 4 in. (102 mm) above the highest expected water and runoff levels. Do not use unit if it has been under water.
Step 5 — Rig and Place Unit
Rigging and handling of this equipment can be hazardous for many reasons due to the installation location (roofs, elevated structures, etc.).
Only trained, qualified crane operators and ground support staff should handle and install this equipment.
When working with this equipment, observe precautions in the literature, on tags, stickers, and labels attached to the equipment, and any other safety precautions that might apply.
Training for operators of the lifting equipment should include, but not be limited to, the following:
1.Application of the lifter to the load, and adjustment of the lifts to adapt to various sizes or kinds of loads.
2.Instruction in any special operation or precaution.
3.Condition of the load as it relates to operation of the lifting kit, such as balance, temperature, etc.
Follow all applicable safety codes. Wear safety shoes and work gloves.
Inspection
Prior to initial use, and at monthly intervals, all rigging shackles, clevis pins, and straps should be visually inspected for any damage, evidence of wear, structural deformation, or cracks. Particular attention should be paid to excessive wear at hoist hooking points and load support areas. Materials showing any kind of wear in these areas must not be used and should be discarded.
!WARNING
UNIT FALLING HAZARD
Failure to follow this warning could result in personal injury or death.
Never stand beneath rigged units or lift over people.
!WARNING
PROPERTY DAMAGE HAZARD
Failure to follow this warning could result in personal injury/death or property damage.
When straps are taut, the clevis should be a minimum of 36 in. (914 mm) above the unit top cover.
Rigging/Lifting of Unit (See Fig. 6)
!WARNING
UNIT FALLING HAZARD
Failure to follow this warning could result in personal injury or death.
Large base units must be secured to common curb before allowing full weight of unit to rest on curb. Install screws through curb into unit base rails while rigging crane is still supporting unit.
Lifting holes are provided in base rails as shown in Fig. 3 and 4.
1.Leave top shipping skid on the unit for use as a spreader bar to prevent the rigging straps from damaging the unit. If the skid is not available, use a spreader bar of sufficient length to protect the unit from damage.
2.Attach shackles, clevis pins, and straps to the base rails of the unit. Be sure materials are rated to hold the weight of the unit (See Fig. 6).
3.Attach a clevis of sufficient strength in the middle of the straps. Adjust the clevis location to ensure unit is lifted level with the ground.
After the unit is placed on the roof curb or mounting pad, remove the top skid.
6
CAUTION - NOTICE TO RIGGERS
PRUDENCE - AVIS AUX MANIPULATEUR
ACCESS PANELS MUST BE IN PLACE WHEN RIGGING.
PANNEAUX D'ACCES DOIT ÊTRE EN PLACE POUR MANIPULATION.
Use top skid as spreader bar. / Utiliser la palette du haut comme barre de répartition
SEE DETAIL A VOIR DÉTAIL A
DUCTS
MINIMUM HEIGHT: 36" (914.4 mm)
HAUTEUR MINIMUM
UNIT HEIGHT
HAUTEUR D'UNITÉ
DETAIL A
VOIR DÉTAIL A
SEAL STRIP MUST BE IN |
BANDE SCELLANT DOIT ÊTRE |
PLACE BEFORE PLACING |
EN PLACE AVANT DE PLACER |
UNIT ON ROOF CURB |
L'UNITÉ SUR LA BASE DE TOIT |
48ES--A
50CY502286 2.0
A09051
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SMALL CABINET |
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LARGE CABINET |
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Unit * |
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24 |
30 |
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36 |
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Unit * |
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42 |
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48 |
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60 |
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lb |
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kg |
lb |
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kg |
lb |
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kg |
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lb |
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kg |
lb |
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kg |
lb |
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kg |
Rigging Weight |
311 |
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141 |
316 |
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143 |
326 |
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148 |
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Rigging Weight |
420 |
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191 |
428 |
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194 |
450 |
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204 |
* For 460 volt units add 14 lb (6.35 kg) to the rigging weight. NOTE: See dimensional drawing for corner weights.
Fig. 6 - 48ES-A Unit Suggested Rigging
7
48ES--A
Table 1 – Physical Data - Unit 48ES-A
UNIT SIZE |
24040 |
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24060 |
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30040 |
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30060 |
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36060 |
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36090 |
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42060 |
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42090 |
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NOMINAL CAPACITY (ton) |
2 |
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2 |
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2---1/2 |
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2---1/2 |
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3 |
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3 |
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3---1/2 |
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3---1/2 |
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SHIPPING WEIGHT** lb. |
311 |
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311 |
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316 |
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316 |
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326 |
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326 |
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420 |
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420 |
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SHIPPING WEIGHT** (kg) |
141 |
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141 |
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143 |
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143 |
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148 |
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148 |
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191 |
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191 |
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COMPRESSORS |
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Quantity |
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1 |
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REFRIGERANT (R---410A) |
4.8 |
|
4.8 |
|
6.2 |
|
6.2 |
|
|
6.4 |
|
6.4 |
|
6.1 |
|
6.1 |
|
|
||||
Quantity lb. |
|
|
|
|
|
|
|
|
|
|
||||||||||||
Quantity (kg) |
2.2 |
|
2.2 |
|
2.8 |
|
2.8 |
|
|
2.9 |
|
2.9 |
|
2.7 |
|
2.7 |
|
|
||||
REFRIGERANT METERING DEVICE |
|
|
|
|
|
|
|
|
TXV |
|
|
|
|
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OUTDOOR COIL |
|
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|
|
|
|
|
|
|
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Rows...Fins/in. |
1..21 |
|
1...21 |
|
1...21 |
|
1...21 |
|
|
1...21 |
|
1...21 |
|
1...21 |
|
1...21 |
|
|
||||
Face Area (sq ft) |
10.2 |
|
10.2 |
|
11.9 |
|
11.9 |
|
|
15.4 |
|
15.4 |
|
13.6 |
|
13.6 |
|
|
||||
OUTDOOR FAN |
|
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|
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|
|
|
Nominal CFM |
2800 |
|
2800 |
|
3000 |
|
3000 |
|
|
3200 |
|
3200 |
|
3600 |
|
3600 |
|
|
||||
Diameter in. |
24 |
|
24 |
|
24 |
|
24 |
|
|
24 |
|
24 |
|
26 |
|
26 |
|
|
||||
Diameter (mm) |
609.6 |
|
609.6 |
|
609.6 |
|
609.6 |
|
|
609.6 |
|
609.6 |
|
660.4 |
|
660.4 |
|
|
||||
Motor Hp (Rpm) |
1/5 (810) |
|
1/5 (810) |
|
1/5 (810) |
|
1/5 (810) |
|
|
1/5 (810) |
|
1/5 (810) |
|
1/5 (810 |
|
1/5 (810) |
|
|
||||
INDOOR COIL |
|
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|
|
|
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|
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|
|
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|
|
|
|
|
|
Rows...Fins/in. |
2...17 |
|
2...17 |
|
3...17 |
|
3...17 |
|
|
3...17 |
|
3...17 |
|
3...17 |
|
3...17 |
|
|
||||
Face Area (sq ft) |
3.7 |
|
3.7 |
|
3.7 |
|
3.7 |
|
|
3.7 |
|
3.7 |
|
4.7 |
|
4.7 |
|
|
||||
INDOOR BLOWER |
800 |
|
800 |
|
1000 |
|
1000 |
|
|
1200 |
|
1200 |
|
1400 |
|
1400 |
|
|
||||
Nominal Cooling Airflow (Cfm) |
|
|
|
|
|
|
|
|
|
|
||||||||||||
Size in. |
10x10 |
|
|
10x10 |
|
10x10 |
|
10x10 |
|
11x10 |
|
|
11x10 |
|
11x10 |
|
11x10 |
|||||
Size (mm.) |
254x254 |
|
|
254x254 |
|
254x254 |
|
254x254 |
|
279.4x254 |
|
279.4x254 |
|
279.4x254 |
|
279.4x254 |
||||||
Motor HP (RPM) |
1/2 (1050) |
|
1/2 (1050) |
|
1/2 (1050) |
1/2 (1050) |
|
|
3/4 (1000) |
|
3/4 (1000) |
|
3/4 (1075) |
|
3/4 (1075) |
|
|
|||||
|
|
|
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|
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|
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|
|
|
|
|
FURNACE SECTION* |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Burner Orifice No. (Qty...Drill Size) |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Natural Gas (Factory Installed) |
2...44 |
|
2...38 |
|
2...44 |
|
2...38 |
|
|
2...38 |
|
3...38 |
|
2...38 |
|
3...38 |
|
|
||||
Propane Gas |
2...55 |
|
2...53 |
|
2...55 |
|
2...53 |
|
|
2...53 |
|
3...53 |
|
2...53 |
|
3...53 |
|
|
||||
HIGH-PRESSURE SWITCH |
|
|
|
|
|
|
|
650 +/-- 15 |
|
|
|
|
|
|
|
|
|
|
||||
(psig) Cut-out Reset (Auto) |
|
|
|
|
|
|
|
420 +/-- 25 |
|
|
|
|
|
|
|
|
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|
||||
|
|
|
|
|
|
|
|
|
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|
|
|
|
|
|
|
|
|
|
|
|
|
LOSS-OF-CHARGE / LOW-PRESSURE |
|
|
|
|
|
|
|
20 +/-- 5 |
|
|
|
|
|
|
|
|
|
|
||||
SWITCH (Liquid Line) (psig) cut-out Reset |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|||||
|
|
|
|
|
|
|
45 +/-- 10 |
|
|
|
|
|
|
|
|
|
|
|||||
(auto) |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|||||
|
|
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|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
RETURN---AIR FILTERS†} |
20x20x1 |
|
|
|
|
20x24x1 |
|
|
|
|
|
|
|
24x30x1 |
|
|
|
|
||||
Throwaway Size in. |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|||||||
(mm) |
508x508x25 |
|
|
|
|
508x610x25 |
|
|
|
|
610x762x25 |
|
|
|
|
|||||||
|
Table 1—Physical Data Con’t - Unit 48ES-A |
|
|
|
|
|
|
|
|
|
|
|
||||||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
||||||
UNIT SIZE |
48090 |
|
48115 |
|
|
48130 |
|
|
60090 |
|
60115 |
|
|
60130 |
|
|
||||||
NOMINAL CAPACITY (ton) |
4 |
|
|
4 |
|
|
|
4 |
|
|
5 |
|
|
5 |
|
|
|
5 |
|
|
||
SHIPPING WEIGHT** lb |
428 |
|
|
428 |
|
|
|
428 |
|
|
450 |
|
|
450 |
|
|
450 |
|
|
|||
SHIPPING WEIGHT** kg |
194 |
|
194 |
|
|
|
194 |
|
|
204 |
|
204 |
|
|
204 |
|
|
|||||
COMPRESSORS |
|
|
|
|
|
|
|
|
Scroll |
|
|
|
|
|
|
|
|
|
|
|
||
Quantity |
|
|
|
|
|
|
|
1 |
|
|
|
|
|
|
|
|
|
|
|
|
||
REFRIGERANT (R---410A) |
6.4 |
|
|
6.4 |
|
|
|
6.4 |
|
|
10.0 |
|
|
10.0 |
|
|
10.0 |
|
|
|||
Quantity lb |
|
|
|
|
|
|
|
|
|
|
|
|||||||||||
Quantity (kg.) |
2.9 |
|
2.9 |
|
|
|
2.9 |
|
|
4.5 |
|
4.5 |
|
|
|
4.5 |
|
|
||||
REFRIGERANT METERING DEVICE |
|
|
|
|
|
|
|
|
TXV |
|
|
|
|
|
|
|
|
|
|
|
||
OUTDOOR COIL |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Rows...Fins/in. |
1...21 |
|
1...21 |
|
|
1...21 |
|
|
2...21 |
|
2...21 |
|
|
2...21 |
|
|
||||||
Face Area (sq ft) |
15.5 |
|
15.5 |
|
|
|
15.5 |
|
|
15.5 |
|
15.5 |
|
|
15.5 |
|
|
|||||
OUTDOOR FAN |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Nominal Cfm |
4000 |
|
4000 |
|
|
4000 |
|
|
3200 |
|
3200 |
|
|
3200 |
|
|
||||||
Diameter in. |
26 |
|
26 |
|
|
|
26 |
|
|
26 |
|
26 |
|
|
|
26 |
|
|
||||
Diameter (mm) |
660.4 |
|
660.4 |
|
|
660.4 |
|
|
660.4 |
|
660.4 |
|
|
660.4 |
|
|
||||||
Motor Hp (Rpm) |
1/5 (810) |
|
1/5 (810) |
|
1/5 (810) |
|
|
1/5 (810) |
|
1/5 (810) |
|
1/5 (810) |
|
|
||||||||
INDOOR COIL |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Rows...Fins/in. |
3...17 |
|
3...17 |
|
|
3...17 |
|
|
3...17 |
|
3...17 |
|
|
3...17 |
|
|
||||||
Face Area (sq ft) |
4.7 |
|
4.7 |
|
|
|
4.7 |
|
|
5.7 |
|
5.7 |
|
|
|
5.7 |
|
|
||||
INDOOR BLOWER |
1600 |
|
|
1600 |
|
|
1600 |
|
|
1750 |
|
|
1750 |
|
|
|
|
|
|
|||
Nominal Cooling Airflow (Cfm) |
11x10 |
|
|
11x10 |
|
|
11x10 |
|
|
11x10 |
|
|
11x10 |
|
|
1750 |
|
|
||||
Size in. |
|
|
|
|
|
|
|
|
|
|
11x10 |
|
|
|||||||||
279.4x254 |
|
|
279.4x254 |
|
279.4x254 |
|
|
279.4x254 |
|
|
279.4x254 |
|
|
|
||||||||
Size (mm) |
|
|
|
|
|
|
|
279.4x254 |
|
|
||||||||||||
1.0 (1075) |
|
|
1.0 (1075) |
|
1.0 (1075) |
|
|
1.0 (1040) |
|
|
1.0 (1040) |
|
|
|||||||||
Motor HP (RPM) |
|
|
|
|
|
|
1.0 (1040) |
|
|
|||||||||||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|||
FURNACE SECTION* |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Burner Orifice No. (Qty...Drill Size) |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Natural Gas (Factory Installed) |
3...38 |
|
3...33 |
|
|
3...31 |
|
|
3...38 |
|
3...33 |
|
|
3...31 |
|
|
||||||
Propane Gas |
3...53 |
|
3...51 |
|
|
3...49 |
|
|
3...53 |
|
3...51 |
|
|
3...49 |
|
|
||||||
HIGH-PRESSURE SWITCH |
|
|
|
|
|
|
|
650 +/-- 15 |
|
|
|
|
|
|
|
|
|
|
||||
(psig) Cut-out Reset (Auto) |
|
|
|
|
|
|
|
420 +/-- 25 |
|
|
|
|
|
|
|
|
|
|
||||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
LOSS-OF-CHARGE / LOW-PRESSURE |
|
|
|
|
|
|
|
20 +/-- 5 |
|
|
|
|
|
|
|
|
|
|
||||
SWITCH (Liquid Line) (psig) cut-out Reset |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|||||
|
|
|
|
|
|
|
45 +/-- 10 |
|
|
|
|
|
|
|
|
|
|
|||||
(auto) |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|||||
|
|
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|
|
|
|
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|
|
|
|
|
|
|
|
|
|
|
|
|
RETURN-AIR FILTERS Throwaway†} in. |
|
|
|
|
|
|
|
|
24x36x1 |
|
|
|
|
|
|
|
|
|
|
|||
(mm) |
|
|
|
|
|
|
|
|
610x914x25 |
|
|
|
|
|
|
|
|
|
|
|||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
*Based on altitude of 0 to 2000 ft (0---610 m). |
|
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|
|
{ Required filter sizes shown are based on the larger of the ARI (Air Conditioning and Refrigeration Institute) rated cooling airflow or the heating airflow velocity of 300 ft/minute for throwaway type. Air filter pressure drop for non---standard filters must not exceed 0.08 IN. W.C.
} If using accessory filter rack refer to the filter rack installation instructions for correct filter sizes and quantity. ** For 460 volt units, add 14 lbs (6.35 kg) to the shipping weight.
8
Step 6 — Connect Condensate Drain
NOTE: When installing condensate drain connection be sure to comply with local codes and restrictions.
Model 48ES-A disposes of condensate water through a 3/4 in. NPT fitting which exits through the base on the evaporator coil access side. See Fig. 3 & 4 for location.
Condensate water can be drained directly onto the roof in rooftop installations (where permitted) or onto a gravel apron in ground level installations. Install a field-supplied 2-in. (51 mm) condensate trap at the end of condensate connection to ensure proper drainage. Make sure that the outlet of the trap is at least 1 in. (25 mm) lower than the drain-pan condensate connection to prevent the pan from overflowing (See Fig. 7). Prime the trap with water. When using a gravel apron, make sure it slopes away from the unit.
Connect a drain tube using a minimum of 3/4-in. PVC or 3/4-in. copper pipe (all field-supplied) at the outlet end of the 2-in. (51 mm) trap. Do not undersize the tube. Pitch the drain tube downward at a slope of at least 1-in. (25 mm) for every 10 ft (3.1 m) of horizontal run. Be sure to check the drain tube for leaks.
TRAP
OUTLET
1-in. (25 mm) min.
2-in. (51 mm) min.
A09052
Fig. 7 - Condensate Trap
Step 7 — Install Flue Hood
The flue assembly is secured and shipped in the return air duct. Remove duct cover to locate the assembly (See Fig. 9).
NOTE: Dedicated low NOx models MUST be installed in California Air Quality Management Districts where a Low NOx rule exists.
These models meet the California maximum oxides of nitrogen (NOx) emissions requirements of 40 nanograms/joule or less as shipped from the factory.
NOTE: Low NOx requirements apply only to natural gas installations.
!WARNING
CARBON MONOXIDE POISONING HAZARD
Failure to follow this warning could result in personal injury or death.
The venting system is designed to ensure proper venting. The flue hood assembly must be installed as indicted in this section of the unit installation instructions.
Install the flue hood as follows:
1.This installation must conform with local building codes and with NFPA 54/ANSI Z223.1 National Fuel Gas Code (NFGC), (in Canada, CAN/CGA B149.1, and B149.2) latest revision. Refer to Provincial and local plumbing or wastewater codes and other applicable local codes.
2.Remove flue hood from shipping location (inside the return section of the blower compartment-see Fig. 9 & 10). Remove the return duct cover to locate the flue hood. Place flue hood assembly over flue panel. Orient screw holes in flue hood with holes in the flue panel.
3.Secure flue hood to flue panel by inserting a single screw on the top flange and the bottom flange of the hood.
Step 8 — Install Gas Piping
The gas supply pipe enters the unit through the access hole provided. The gas connection to the unit is made to the 1/2-in. (12.7 mm) FPT gas inlet on the gas valve.
Install a gas supply line that runs to the heating section. Refer to the NFGC for gas pipe sizing. Do not use cast-iron pipe. It is recommended that a black iron pipe is used. Check the local utility for recommendations concerning existing lines. Size gas supply piping for 0.5 IN. W.C. maximum pressure drop. Never use pipe smaller than the 1/2-in. (12.7 mm) FPT gas inlet on the unit gas valve.
For natural gas applications, the gas pressure at unit gas connection must not be less than 4.0 IN. W.C. or greater than 13 IN. W.C. while the unit is operating. For propane applications, the gas pressure must not be less than 11.0 IN. W.C. or greater than 13 IN. W.C. at the unit connection.
A 1/8-in. (3.2 mm) NPT plugged tapping, accessible for test gauge connection, must be installed immediately upstream of the gas supply connection to the gas valve.
When installing the gas supply line, observe local codes pertaining to gas pipe installations. Refer to the NFPA 54/ANSI Z223.1 latest edition (in Canada, CAN/CGA B149.1).
NOTE: In the state of Massachusetts:
1.Gas supply connections MUST be performed by a licensed plumber or gas fitter.
2.When flexible connectors are used, the maximum length shall not exceed 36 inches (915 mm).
3.When lever handle type manual equipment shutoff valves are used, they shall be T-handle valves.
4.The use of copper tubing for gas piping is NOT approved by the state of Massachusetts.
In the absence of local building codes, adhere to the following pertinent recommendations:
1.Avoid low spots in long runs of pipe. Grade all pipe 1/4 in. (6.35 mm) for every 15 ft (4.6 m) of length to prevent traps. Grade all horizontal runs downward to risers. Use risers to connect to heating section and to meter.
2.Protect all segments of piping system against physical and thermal damage. Support all piping with appropriate straps,
hangers, etc. Use a minimum of one hanger every 6 ft (1.8 m). For pipe sizes larger than 1/2 in., follow recommendations of national codes.
3.Apply joint compound (pipe dope) sparingly and only to male threads of joint when making pipe connections. Use only pipe dope that is resistant to action of liquefied petroleum gases as specified by local and/or national codes. Never use Teflon tape.
4.Install sediment trap in riser leading to heating section (See Fig. 8). This drip leg functions as a trap for dirt and condensate.
5.Install an accessible, external, manual main shutoff valve in gas supply pipe within 6 ft (1.8 m) of heating section.
6.Install ground-joint union close to heating section between unit manual shutoff and external manual main shut-off valve.
7.Pressure test all gas piping in accordance with local and national plumbing and gas codes before connecting piping to unit.
48ES--A
9
48ES--A
Table 2 – Maximum Gas Flow Capacity*
NOMINAL |
INTERNAL |
|
|
|
|
|
|
|
LENGTH OF PIPE FT (m)† |
|
|
|
|
|
|
|
||||
IRON PIPE |
DIAMETER |
10 |
|
20 |
30 |
40 |
50 |
60 |
70 |
|
80 |
90 |
100 |
125 |
150 |
175 |
200 |
|
|
|
SIZE (IN.) |
(IN.) |
(3) |
|
(6) |
(9) |
(12) |
(15) |
(18) |
(21) |
|
(24) |
(27) |
(30) |
(38) |
(46) |
(53) |
(61) |
|
|
|
1/2 |
.622 |
175 |
|
120 |
97 |
82 |
73 |
66 |
61 |
|
57 |
53 |
50 |
44 |
40 |
— |
— |
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3/4 |
.824 |
360 |
|
250 |
200 |
170 |
151 |
138 |
125 |
|
118 |
110 |
103 |
93 |
84 |
77 |
72 |
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1 |
1.049 |
680 |
|
465 |
375 |
320 |
285 |
260 |
240 |
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220 |
205 |
195 |
175 |
160 |
145 |
135 |
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1---1/4 |
1.380 |
1400 |
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950 |
770 |
600 |
580 |
530 |
490 |
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460 |
430 |
400 |
360 |
325 |
300 |
280 |
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1---1/2 |
1.610 |
2100 |
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1460 |
1180 |
990 |
900 |
810 |
750 |
|
690 |
650 |
620 |
550 |
500 |
460 |
430 |
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*Capacity of pipe in cu ft of gas per hr for gas pressure of 0.5 psig or less. Pressure drop of 0.5---IN. W.C. (based on a 0.60 specific gravity gas). Refer to Table 2 |
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and National Fuel Gas Code NFPA 54/ANSI Z223.1. |
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{ This length includes an ordinary number of fittings. |
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IN |
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been completed. Use a commercially available soap solution |
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(or method specified by local codes and/or regulations). |
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TEE
OUT
NIPPLE
CAP
C99020
Fig. 8 - Sediment Trap
NOTE: Pressure test the gas supply system after the gas supply piping is connected to the gas valve. The supply piping must be disconnected from the gas valve during the testing of the piping systems when test pressure is in excess of 0.5 psig. Pressure test the gas supply piping system at pressures equal to or less than 0.5 psig. The unit heating section must be isolated from the gas piping system by closing the external main manual shutoff valve and slightly opening the ground-joint union.
!WARNING
FIRE OR EXPLOSION HAZARD
Failure to follow this warning could result in personal injury, death and/or property damage.
-Connect gas pipe to unit using a backup wrench to avoid damaging gas controls.
-Never purge a gas line into a combustion chamber. Never test for gas leaks with an open flame. Use a commercially available soap solution made specifically for the detection of leaks to check all connections.
-Use proper length of pipe to avoid stress on gas control manifold.
-If a flexible connector is required or allowed by authority having jurisdiction, black iron pipe shall be installed at furnace gas valve and extend a minimum of 2 in. (51 mm) outside furnace casing.
-If codes allow a flexible connector, always use a new connector. do not use a connector which has previously serviced another gas appliance.
8.Check for gas leaks at the field-installed and factory-installed gas lines after all piping connections have
Step 9 — Install Duct Connections
The unit has duct flanges on the supplyand return-air openings on the side and bottom of the unit. For downshot applications, the ductwork connects to the roof curb (See Fig. 3 and 4 for connection sizes and locations).
Configuring Units for Downflow (Vertical) Discharge
!WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury or death.
Before installing or servicing system, always turn off main power to system and install lockout tag. There may be more than one disconnect switch.
1.Open all electrical disconnects before starting any service work.
2.Remove horizontal (metal) duct covers to access vertical (downflow) discharge duct knockouts in unit basepan.
3.Using Fig. 10 as a guide, proceed to cut out the downflow duct panels.
4.Drill 1/2 in. (13 mm) diameter or larger holes in all four corners of duct panels.
NOTE: On large chassis units remove sheet metal shields on panels by using a screw driver to shear off retainers and discard.
5.On left and side supply duct opening side with keyhole or single bladed hacksaw cut out panel along “V” groove.
6.On right side, with keyhole or single blade hacksaw, with teeth facing up and starting from the front and moving to the rear, cut along “V” groove.
7.Now with three sides cut, flex panel up and down to remove.
8.Replace side access panel and duct cover.
9.After completing unit conversion, perform all safety checks and power up unit.
Alternate Method
1.Open all electrical disconnects and install lockout tag before starting any service work.
2.Remove horizontal (metal) ductcovers to access vertical (downflow) discharge duct knockouts in unit basepan. (See Fig. 9.)
3.Leave top shipping crate on unit during this method.
4.Tip unit over on the front side (access panels) so the bottom of the base pan is accessible.
5.Drill two holes diagonally opposed, of suitable size to accommodate jigsaw or reciprocating saw. (See Fig. 10.)
10
NOTE: On large chassis units remove sheet metal shields on panels by using a screw driver to shear off retainers and discard.
!CAUTION
UNIT COMPONENT DAMAGE HAZARD
Failure to follow this caution may result in damage to the unit being installed.
When cutting duct panels, do not contact or damage any internal components (heat exchanger, electric heat). Do not use a saw blade that protrudes more than 1 in. (25 mm) into unit.
!CAUTION
PROPERTY DAMAGE HAZARD
Failure to follow this caution may result in property damage.
Collect ALL screws that were removed. Do not leave screws on rooftop as permanent damage to the roof may occur.
6.Using a suitable saw cut along “V” groove and remove duct panels.
7.Tip unit back onto its base and replace duct covers.
8.After completing unit conversion, perform all safety checks and power up unit.
NOTE: The design and installation of the duct system must be in accordance with the standards of the NFPA for installation of nonresidence-type air conditioning and ventilating systems, NFPA 90A or residence-type, NFPA 90B; and/or local codes and ordinances.
Horizontal Duct Covers
A09061
Basepan |
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Downflow |
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(Vertical) |
Basepan |
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Supply |
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Downflow |
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Knockout |
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(Vertical) |
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Return |
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Knockout |
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A09060 |
Fig. 9 - Supply and Return Duct Opening
Return Duct Panels
Supply Duct Panels |
48ES--A |
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Return & Supply Duct Panels from Underside of Base (Alternate Method)
A09420
Fig. 10 - Vertical (Downflow) Discharge Duct Knockouts
Adhere to the following criteria when selecting, sizing, and installing the duct system:
1.Units are shipped for horizontal duct installation (by removing duct covers).
2.Select and size ductwork, supply-air registers, and return-air grilles according to American Society of Heating, Refrigeration and Air Conditioning Engineers (ASHRAE) recommendations.
3.Use flexible transition between rigid ductwork and unit to prevent transmission of vibration. The transition may be screwed or bolted to duct flanges. Use suitable gaskets to ensure weather-tight and airtight seal.
4.All units must have field-supplied filters or accessory filter rack installed in the return-air side of the unit. Recommended sizes for filters are shown in Table 1.
5.Size all ductwork for maximum required airflow (either heating or cooling) for unit being installed. Avoid abrupt duct size increases or decreases or performance may be affected.
6.Adequately insulate and weatherproof all ductwork located outdoors. Insulate ducts passing through unconditioned space, and use vapor barrier in accordance with latest issue of Sheet Metal and Air Conditioning Contractors National Association (SMACNA) and Air Conditioning Contractors of America (ACCA) minimum installation standards for
11
48ES--A
heating and air conditioning systems. Secure all ducts to building structure.
7.Flash, weatherproof, and vibration isolate all openings in building structure in accordance with local codes and good building practices.
Step 10 — Install Electrical Connections
!WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury or death.
The unit cabinet must have an uninterrupted, unbroken electrical ground. This ground may consist of an electrical wire connected to the unit ground screw in the control compartment, or conduit approved for electrical ground when installed in accordance with NFPA 70 (NEC) (latest edition) (in Canada, Canadian Electrical Code CSA C22.1) and local electrical codes.
!CAUTION
UNIT COMPONENT DAMAGE HAZARD
Failure to follow this caution may result in damage to the unit being installed.
1.Make all electrical connections in accordance with NFPA 70 (NEC) (latest edition) and local electrical codes governing such wiring. In Canada, all electrical connections must be in accordance with CSA standard C22.1 Canadian Electrical Code Part 1 and applicable local codes. Refer to unit wiring diagram.
2.Use only copper conductor for connections between field-supplied electrical disconnect switch and unit. DO NOT USE ALUMINUM WIRE.
3.Be sure that high-voltage power to unit is within operating voltage range indicated on unit rating plate. On 3-phase units, ensure phases are balanced within 2 percent. Consult local power company for correction of improper voltage and/or phase imbalance.
4.Insulate low-voltage wires for highest voltage contained within conduit when low-voltage control wires are in same conduit as high-voltage wires.
5.Do not damage internal components when drilling through any panel to mount electrical hardware, conduit, etc.
High-Voltage Connections
When routing power leads into unit, use only copper wire between disconnect and unit. The high voltage leads should be in a conduit until they enter the duct panel; conduit termination at the duct panel must be watertight.
The unit must have a separate electrical service with a field-supplied, waterproof disconnect switch mounted at, or within sight from, the unit. Refer to the unit rating plate, NEC and local codes for maximum fuse/circuit breaker size and minimum circuit amps (ampacity) for wire sizing.
The field-supplied disconnect switch box may be mounted on the unit over the high-voltage inlet hole when the standard power and low-voltage entry points are used (See Fig. 3 and 4 for acceptable location).
See unit wiring label (Fig. 15, 16 and 17) and Fig. 11 for reference when making high voltage connections. Proceed as follows to complete the high-voltage connections to the unit.
Single phase units:
1.Run the high-voltage (L1, L2) and ground lead into the control box.
2.Connect ground lead to chassis ground connection.
3.Locate the black and yellow wires connected to the line side of the contactor (if equipped).
4.Connect field L1 to black wire on connection 11 of the compressor contactor.
5.Connect field wire L2 to yellow wire on connection 23 of the compressor contactor.
Three-phase units:
1.Run the high-voltage (L1, L2, L3) and ground lead into the control box.
2.Connect ground lead to chassis ground connection.
3.Locate the black and yellow wires connected to the line side of the contactor (if equipped).
4.Connect field L1 to black wire on connection 11 of the compressor contactor.
5.Connect field wire L3 to yellow wire on connection 13 of the compressor contactor.
6.Connect field wire L2 to blue wire from compressor.
Special Procedures for 208-v Operation
!WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury or death.
Make sure the power supply to the unit is switched OFF and install lockout tag. before making any wiring changes. With disconnect switch open, move black wire from transformer (3/16 in. [4.8 mm]) terminal marked 230 to terminal marked 208. This retaps transformer to primary voltage of 208 vac.
!WARNING
ELECTRICAL SHOCK FIRE/EXPLOSION HAZARD
Failure to follow this warning could result in personal injury or death and property damage.
Before making any wiring changes, make sure the gas supply is switched off first. Then switch off the power supply to the unit and install lockout tag.
Control Voltage Connections
Do not use any type of power-stealing thermostat. Unit control problems may result.
Use no. 18 American Wire Gage (AWG) color-coded, insulated (35_C minimum) wires to make the control voltage connections between the thermostat and the unit. If the thermostat is located more than 100 ft (30.5 m) from the unit (as measured along the control voltage wires), use no. 16 AWG color-coded, insulated (35_C minimum) wires.
Standard Connection
Run the low-voltage leads from the thermostat, through the inlet hole, and into unit low-voltage splice box.
Locate six (seven for 3-phase) 18-gage wires leaving control box. These low-voltage connection leads can be identified by the colors red, green, yellow, brown, blue, and white (See Fig. 11). A gray wire is standard on 3-phase units for connection to an economizer. Ensure the leads are long enough to be routed into the low-voltage splice box (located below right side of control box). Route leads through hole in bottom of control box and make low-voltage
12
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