Bryant 3-PHASE 602A User Manual

installation, start-up,
601A
and service instructions
3-PHASE SINGLE-PACKAGED HEAT PUMPS
NOTE: Read the entire instruction manual before starting the installation.
TABLE OF CONTENTS
SAFETY CONSIDERATIONS .....................................................1
INTRODUCTION ..........................................................................2
RECEIVING AND INSTALLATION ..........................................2
Check Equipment......................................................................2
IDENTIFY UNIT ................................................................2
Provide Unit Support ................................................................2
ROOF CURB.......................................................................2
SLAB MOUNT ...................................................................2
GROUND MOUNT ............................................................2
Provide Clearances....................................................................2
Rig and Place Unit....................................................................2
INSPECTION ......................................................................2
INSTALLATION ................................................................2
Select and Install Ductwork .....................................................5
CONVERTING HORIZONTAL DISCHARGE UNITS TO
DOWNFLOW (VERTICAL) DISCHARGE UNITS.........7
Provide for Condensate Disposal .............................................7
Install Electrical Connections...................................................7
HIGH-VOLTAGE CONNECTIONS..................................9
ROUTING POWER LEADS INTO UNIT ......................14
CONNECTING GROUND LEAD TO GROUND LUG.14
ROUTING CONTROL POWER WIRES (24-V) ............14
SPECIAL PROCEDURES FOR 208-V OPERATION ...14
PRE-START-UP ..........................................................................15
START-UP ...................................................................................15
Check for Refrigerant Leaks ..................................................15
Start-Up Adjustments..............................................................15
CHECKING COOLING AND HEATING
CONTROL OPERATION.................................................15
CHECKING AND ADJUSTING REFRIGERANT
CHARGE ...........................................................................16
REFRIGERANT CHARGE ..............................................16
NO CHARGE....................................................................16
LOW CHARGE COOLING .............................................17
TO USE COOLING CHARGING CHARTS ..................17
INDOOR AIRFLOW AND AIRFLOW ADJUST-
MENTS..............................................................................17
MAINTENANCE.........................................................................18
Air Filter..................................................................................18
Indoor blower and motor........................................................18
OUTDOOR COIL, INDOOR COIL, AND
CONDENSATE DRAIN PAN...............................................19
Outdoor fan .............................................................................19
Electrical controls and wiring ................................................20
Refrigerant circuit ...................................................................20
Indoor airflow .........................................................................20
Metering device ......................................................................20
Liquid line strainers ................................................................22
High Flow Valves...................................................................22
Time-delay relay .....................................................................22
602A
030-060
Cancels: New II 601A-30-1
2-06
C99001
Fig. 1—Model 601A/602A
Loss of charge switch.............................................................22
Check defrost thermostat ........................................................22
Defrost Thermostat .................................................................22
TROUBLESHOOTING ...............................................................22
START-UP CHECKLIST............................................................22
NOTE TO INSTALLER — READ THESE INSTRUCTIONS CAREFULLY AND COMPLETELY before installing this unit. Also, make sure the Owner’s Manual and Service Instructions are left with the unit after installation.
SAFETY CONSIDERATIONS
Installation and servicing of air-conditioning equipment can be hazardous due to system pressure and electrical components. Only trained and qualified personnel should install, repair, or service air-conditioning equipment.
Untrained personnel can perform basic maintenance functions of cleaning coils and filters. All other operations should be performed by trained service personnel. When working on air-conditioning equipment, observe 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 extinguisher available for all brazing operations.
—1—
WARNING: Improper installation, adjustment, alter­ation, service, maintenance, or use can cause explosion, fire, electric shock, or other occurrences, which could cause serious injury or death or damage your property. Consult a qualified installer or service agency for infor­mation or assistance. The qualified installer or agency must use only factory-authorized kits or accessories when modifying this product.
Recognize safety information. This is the safety-alert symbol . When you see this symbol on the product or in instructions or manuals, be alert to the potential for personal injury.
Understand the signal words — DANGER, WARNING, CAU­TION, and NOTE. Danger identifies the most serious hazards, which will result in severe personal injury or death. Warning indicates a condition that could cause serious personal injury or death. Caution is used to identify unsafe practices, which would 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.
1. The power supply (volts, phase, and hertz) must correspond to that specified on unit rating plate.
2. The electrical supply provided by the utility must be sufficient to handle load imposed by this unit.
3. This installation must conform with local building codes and with NEC (National Electrical Code). Refer to provin­cial and local plumbing or waste water codes and other applicable local codes.
WARNING: Before performing service or maintenance operations on system, turn off main power to unit. Turn off accessory heater power switch if applicable. Electrical shock could cause severe injury or death.
INTRODUCTION
The 601A and 602A heat pumps are fully self-contained and designed for outdoor installation (See Fig. 1). Standard units are shipped in a horizontal-discharge configuration for installation on a ground-level slab. Units can be converted to downflow (vertical) discharge configurations for rooftop applications. See Fig. 2 and 3 for unit dimensions.
RECEIVING AND INSTALLATION
I. CHECK EQUIPMENT
A. IDENTIFY UNIT
The unit model number and serial number are stamped on the unit identification plate. Check this information against shipping pa­pers.
B. INSPECT SHIPMENT
Inspect for shipping damage while unit is still on shipping pallet. 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 Bryant Air Conditioning office if any item is missing. To prevent loss or damage, leave all parts in original packages until installation.
II. PROVIDE UNIT SUPPORT
A. 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 watertight 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. (See Fig. 6). This is necessary for unit drain to function properly. Refer to accessory roof curb installation instructions for additional information as required.
B. SLAB MOUNT
Place the unit on a solid, level concrete pad that is a minimum of 4 in. thick with 2 in. above grade (See Fig. 7). The slab should extend approximately 2 in. beyond the casing on all 4 sides of the unit. Do not secure the unit to the slab except when required by local codes.
C. GROUND MOUNT
The unit may be installed either on a slab or placed directly on the ground if local codes permit. Place the unit on level ground prepared with gravel for condensate discharge.
III. PROVIDE CLEARANCES
The required minimum service clearances are shown in Figs. 2 and
3. Adequate ventilation and outdoor air must be provided. The outdoor fan draws air through the outdoor coil and discharges it through the top fan grille. Be sure that the fan discharge does not recirculate to the outdoor 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 36 in. above the unit top. The maximum horizontal extension of a partial overhang must not exceed 48 in. For extended overhangs, provide a minimum clearance of 48 in.
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.
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. above the highest expected water and runoff levels. Do not use unit if it has been under water.
IV. 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.
Follow all applicable safety codes. Wear safety shoes and work gloves.
A. INSPECTION
Prior to initial use, and at monthly intervals, all rigging brackets 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. Brackets or straps showing any kind of wear in these areas must not be used and should be discarded.
B. INSTALLATION
1. Remove unit from shipping carton. Leave top shipping skid on the unit as a spreader bar to prevent the rigging straps from damaging the unit. If the wood skid is not available, use a spreader bar of sufficient length to protect unit from damage.
2. Position the lifting bracket assembly around the base of the unit. Be sure the strap does not twist.
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C00137
UNIT ELECTRICAL CHARACTERISTICS
601A030 208/230-3-60 287 130.2 39.02 (991.1) 19.5 (495.3) 13.7 (348.0) 15.0 (381.0) 601A036 208/230-3-60, 460-3-60 291 132.0 37.02 (940.3) 19.5 (495.3) 13.7 (348.0) 13.0 (330.2) 601A042 208/230-3-60, 460-3-60 323 146.5 37.02 (940.3) 19.7 (500.4) 14.0 (355.6) 13.0 (330.2) 602A030 208/230-3-60 320 145.2 37.02 (940.3) 19.7 (500.4) 14.0 (355.6) 17.6 (447.0) 602A036 208/230-3-60, 460-3-60 328 148.8 37.02 (940.3) 19.7 (500.4) 14.0 (355.6) 16.5 (419.1)
UNIT WEIGHT
Lb Kg X Y Z
UNIT HEIGHT
IN. (MM)
”A”
CENTER OF GRAVITY
IN. (MM)
Fig. 2—601A030-042/602A030-036 Unit Dimensions
—3—
C00136
UNIT ELECTRICAL CHARACTERISTICS
601A048 208/230-3-60, 460-3-60 353 160.1 38.98 (990.2) 19.9 (505.5) 15.7 (398.8) 17.0 (431.8) 601A060 208/230-3-60, 460-3-60 418 189.6 38.98 (990.2) 19.9 (505.5) 15.7 (398.8) 17.0 (431.8) 602A042 208/230-3-60, 460-3-60 350 158.8 40.98 (1040.9) 19.9 (505.5) 15.7 (398.8) 16.6 (421.6) 602A048 208/230-3-60, 460-3-60 315 170.1 40.98 (1040.9) 19.9 (505.5) 15.7 (398.8) 18.0 (457.2) 602A060 208/230-3-60, 460-3-60 428 194.1 42.98 (1091.7) 19.9 (505.5) 15.7 (398.8) 17.6 (447.0)
UNIT WEIGHT
Lb Kg X Y Z
UNIT HEIGHT
IN. (MM)
”A”
CENTER OF GRAVITY
IN. (MM)
Fig. 3—601A048-060/602A042-060 Unit Dimensions
—4—
12
y
43
CORNER WEIGHTS (SMALL CABINET) CORNER WEIGHTS (LARGE CABINET)
Unit 303642
Total Weight 287 291 323 Total Weight 353 418 — Corner Weight 1 66 67 83 Corner Weight 1 76 90 — Corner Weight 2 54 55 55 Corner Weight 2 49 58
Model 601A
Model 602A
3. Place each of the 4 metal lifting brackets into the rigging
4. Thread lifting bracket strapping around bottom perimeter of
5. Tighten the tension buckle until it is taut. Lifting brackets
6. Attach field-supplied clevis or hook of sufficient strength to
7. Attach the 2 safety straps directly to the clevis or hook at the
8. Position lifting point directly over the unit’s center of
9. Lift unit. When unit is directly over the roof curb, remove
V. SELECT AND INSTALL DUCTWORK
The design and installation of the duct system must be in accordance with the standards of the NFPA for installation of non-residence type air conditioning and ventilating systems, NFPA 90A or residence type, NFPA 90B and/or local codes and ordinances.
Corner Weight 3 62 63 78 Corner Weight 3 96 114 — Corner Weight 4 105 106 107 Corner Weight 4 132 156
CORNER WEIGHTS (Small Cabinet) CORNER WEIGHTS (Large Cabinet)
Unit 30 36
Total Weight 320 328 Total Weight 350 375 428 Corner Weight 1 63 64 Corner Weight 1 75 81 92 Corner Weight 2 74 76 Corner Weight 2 49 52 60 Corner Weight 3 56 58 Corner Weight 3 95 102 116 Corner Weight 4 127 130 Corner Weight 4 131 140 160
Fig. 4—Corner Weights (in Pounds)
holds in the composite pan.
unit as follows:
a. Open lever of tension buckle (ratchet type).
b. Feed strapping through tension buckle as shown in Fig.
8.
c. Pull strapping through tension buckle unit taut.
d. Snap lever down to lock strap in tension buckle. To
release strapping, squeeze safety latch, lift lever, and pull webbing outward.
must be secure in the rigging holds.
hole in the lifting bracket (See Fig. 8).
4 rigging brackets. DO NOT attach the safety straps to the lifting brackets (See Fig. 8).
gravity.
the 2 safety straps. Lower the equipment onto the roof curb.
x
C00071
Unit 48 60
Model 601A
Unit 424860
Model 602A
Select and size ductwork, supply-air registers, and return air grilles according to ASHRAE (American Society of Heating, Refrigera­tion, and Air Conditioning Engineers) recommendations.
The unit has duct flanges on the supply- and return-air openings on the side of the unit.
When designing and installing ductwork, consider the following:
WARNING: For vertical supply and return units, tools or parts could drop into ductwork and cause serious injury or death. Install a 90 degree turn in the return ductwork between the unit and the conditioned space. If a 90 degree elbow cannot be installed, then a grille of sufficient strength and density should be installed to prevent objects from falling into the conditioned space. Units with electric heaters require 90 degree elbow in supply duct.
1. All units should have field-supplied filters or accessory filter rack installed in the return-air side of the unit. Recommended sizes for filters are shown in Tables 1 and 2.
2. Avoid abrupt duct size increases and reductions. Abrupt change in duct size adversely affects air performance.
IMPORTANT: Use flexible connectors between ductwork and unit to prevent transmission of vibration. Use suitable gaskets to ensure weather tight and airtight seal. When electric heat is installed, use fireproof canvas (or similar heat resistant material) connector between ductwork and unit discharge connection. If flexible duct is used, insert a sheet metal sleeve inside duct. Heat resistant duct connector (or sheet metal sleeve) must extend 24-in. from electric heater element.
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HVAC unit
Scre w
(NO TE A)
*Gask eting
outer flange
Flashing field
supplied
Roofing material
field supplied
Cant str ip
field supplied
base
Gask eting
inner flange*
Wood nailer*
Roofcurb*
Insulation (field
supplied)
Duct wo rk
field supplied
HVAC unit
Scre w
(NOTE A)
*Gask eting
outer flange
Flashing field
supplied
Roofing material
field supplied
Cant str ip
field supplied
base
Gask eting
inner flange*
Duct wo rk
field supplied
Wood nailer*
Roofcurb*
Insulation (field
supplied)
Roof
*Provided with roofcurb
Roof Curb for Small Cabinet
Note A: When unit mounting scre w is used,
retainer bra cke t must also be used.
B Typ.
5
/16"
44
C Typ.
Supply opening (B x C)
D
*Provided with roofcurb
Roof Curb for Large Cabinet
Note A: When unit mounting scre w is used,
retainer bra cket must also be used.
R/A
A
Gask et around
Roof
S/A
duct
Short
Insulated
Retur n opening
(B X C)
deck pan
Support
UNIT SIZE ODS CATALOG NUMBER
601A030-042 602A030-036
601A048, 060 602A042-060
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. Dimensions in ( ) are in millimeters.
4. Roof curb is made of 16-gauge steel.
5. Table lists only the dimensions, per part number, that have changed.
6. Attach ductwork to curb (flanges of duct rest on curb).
7. Insulated panels: 1-in. thick fiberglass 1 lb density.
8. Dimensions are in inches.
9. When unit mounting screw is used (see Note A), a retainer bracket must be used as well. This bracket must also be used when required by code for hurricane or seismic conditions. This bracket is available through Micrometl.
CPRFCURB006A00 8 (203) 11(279) 161/2 (419) 28-3/4 (730) CPRFCURB007A00 14 (356) 11(279) 161/2 (419) 28-3/4 (730) CPRFCURB008A00 8 (203) 16 3/16 (411) 17 3/8 (441) 40-1/4 (1022) CPRFCURB009A00 14 (356) 16 3/16 (411) 17 3/8 (441) 40-1/4 (1022)
Support
Long
A
IN. (MM)
Insulated deck pan
B
IN. (MM)
Gask et around
outer edge
C
IN. (MM)
C00076
D
IN. (MM)
Fig. 5—Roof Curb Dimensions
—6—
A
B
C
MAXIMUM ALLOWABLE
DIFFERENCE (in.)
A-B B-C A-C
1/4 1/4 1/4
C99065
Fig. 6—Unit Leveling Tolerances
3. Size ductwork for cooling air quantity (cfm). The minimum air quantity for proper electric heater operation is listed in Tables 3 and 4. Heater limit switches may trip at air quantities below those recommended.
4. Seal, insulate, and weatherproof all external ductwork. Seal, insulate and cover with a vapor barrier all ductwork passing through conditioned spaces. Follow latest Sheet Metal and Air Conditioning Contractors National Association (SMACNA) and Air Conditioning Contractors Association (ACCA) minimum installation standards for residential heating and air conditioning systems.
5. Secure all ducts to building structure. Flash, weatherproof, and vibration-isolate duct openings in wall or roof accord­ing to good construction practices.
A. CONVERTING HORIZONTAL DISCHARGE UNITS TO DOWNFLOW (VERTICAL) DISCHARGE UNITS
OPTIONAL
RETURN
AIR
OPENING
2"
EVAP. COIL COND. COIL
Fig. 7—Slab Mounting Detail
DETAIL A
OPTIONAL
SUPPLY
AIR
OPENING
C99096
WARNING: Before performing service or maintenance operations on system, turn off main power to unit and install lockout tag. Turn off accessory heater power switch if applicable. Electrical shock could cause serious injury or death.
1. Open all electrical disconnects and install lockout tag before starting any service work.
2. Remove side duct covers to access bottom return and supply knock outs.
NOTE: These panels are held in place with tabs similar to an electrical knockout.
3. Use a screwdriver and hammer to remove the panels in the bottom of the composite unit base.
4. Ensure the side duct covers are in place to block off the horizontal air openings.
NOTE: Avoid abrupt duct size increases and reductions. Abrupt change in duct size adversely affects air performance.
VI. PROVIDE FOR CONDENSATE DISPOSAL
NOTE: Ensure that condensate-water disposal methods comply
with local codes, restrictions, and practices.
The units dispose of condensate through a 3/4 in. NPT female fitting that exits on the compressor end of the unit. 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 condensate trap at end of condensate connection to ensure proper drainage. Make sure that the outlet of the trap is at least 1 in. lower than the drain-pan condensate connection to prevent the pan from overflowing. Prime the trap with water. When using a gravel apron, make sure it slopes away from the unit.
If the installation requires draining the condensate water away from the unit, install a field-supplied 2-in. trap at the condensate connection to ensure proper drainage. Condensate trap is available
A05179
UNIT
Size lb kg in. mm. in. mm. 601A030 309 140.2 19.5 495.3 17.50 444.5 601A036 313 142.0 19.5 495.3 17.75 450.9 601A042 345 156.4 19.5 495.3 17.75 450.9 601A048 375 170.1 20.5 520.7 20.62 523.8 601A060 440 199.6 19.5 495.3 19.75 501.7 602A030 342 155.2 20.0 508 19.25 489 602A036 350 158.8 20.0 508 19.0 482.6 602A042 372 168.8 21.0 533.4 20.5 520.7 602A048 377 171.0 20.0 508 21.25 539.8 602A060 450 204.2 21.0 533.4 20.0 508.0
MAXIMUM WEIGHT
(INCLUDES SHIPPING SKID)
AB
Fig. 8—Suggested Rigging
as an accessory or is field-supplied. Make sure that the outlet of the trap is at least 1 in. lower than the unit drain-pan condensate connection to prevent the pan from overflowing. Connect a drain trough using a minimum of field-supplied 3/4 -in. PVC or field-supplied 3/4 -in. copper pipe at outlet end of the 2 -in. trap (See Fig. 11). Do not undersize the tube. Pitch the drain trough downward at a slope of at least 1 in. every 10 ft. of horizontal run. Be sure to check the drain trough for leaks. Prime the trap at the beginning of the cooling season start-up.
—7—
TABLE 1—PHYSICAL DATA
UNIT SIZE 601A030 601A036 601A042 601A048 601A060
NOMINAL CAPACITY (ton) 2-1/2 3 3-1/2 4 5
OPERATING WEIGHT (lb.) 287 291 323 353 418
COMPRESSOR QUANTITY 1
TYPE RECIPROCATING COMPRESSOR SCROLL COMPRESSOR
REFRIGERANT R-22
REFRIGERANT METERING DEVICE AccuRater®
Refrigerant (R-22) Quantity (lb.) 5.6 7.6 8.0 7.85 9.3
ORIFICE ID (in.) 0.068 0.078 0.078 0.088 0.093
ORIFICE OD (in.) 0.042 (2) 0.046 (2) 0.052 (2) 0.057 (2) 0.061 (2)
OUTDOOR COIL
Rows... Fins/in.
Face Area (sq. ft.)
OUTDOOR FAN
Nominal Airflow (CFM)
Diameter
Motor HP (RPM)
INDOOR COIL
Rows... Fins/in.
Face Area (sq. ft.)
INDOOR BLOWER
Nominal Airflow (CFM)
Size (in.)
Motor HP (RPM)
RETURN-AIR FILTERS (in.)
throwaway
1...17
12.0
2400
22
1/8 (825)
3...15
3.7
1000
10X10
1/4 (1075)
20X20X1 20X24X1 24X30X1 24X30X1 24X30X1
2...17
10.3
2800
22
1/4 (1100)
3...15
3.7
1200
11X10
1/2 (1075)
2...17
10.3
2400
22
1/8 (825)
4...15
3.7
1250
11X10
3/4 (1075)
2...17
11.6
3300
22
1/4 (1100)
3...15
4.7
1600
11X10
3/4 (1075)
1/4 (1100)
2...17
11.6
3300
22
4...15
4.7
2000
11X10
1 (1100)
TABLE 2—PHYSICAL DATA
UNIT SIZE 602A030 602A036 602A042 602A048 602A060
NOMINAL CAPACITY (ton) 2-1/2 3 3-1/2 4 5
OPERATING WEIGHT (lb.) 320 328 350 375 428
COMPRESSOR QUANTITY 1
TYPE SCROLL COMPRESSOR
REFRIGERANT R-22
REFRIGERANT METERING DEVICE AccuRater®
Refrigerant (R-22) Quantity (lb.) 6.4 7.0 10.8 10.1 12.3
ORIFICE ID (in.) 0.073 0.076 0.080 0.088 0.093
ORIFICE OD (in.) 0.043 (2) 0.040 (2) 0.052 (2) 0.057 (2) 0.063 (2)
OUTDOOR COIL
Rows... Fins/in.
Face Area (sq. ft.)
OUTDOOR FAN
Nominal Airflow (CFM)
Diameter
Motor HP (RPM)
INDOOR COIL
Rows... Fins/in.
Face Area (sq. ft.)
INDOOR BLOWER
Nominal Airflow (CFM)
Size (in.)
Motor HP (RPM)
RETURN-AIR FILTERS (in.)
throwaway
NOTE: Air filter pressure drop for non-standard filters must not exceed 0.08 in. wg.
2...17
10.3
2350
22
1/8 (825)
3...15
3.7
1000
10X10
1/4 (1075)
20X20X1 20X24X1 24X30X1 24X30X1 24X30X1
2...17
10.3
2800
22
1/4 (1100)
4...15
3.7
1200
10X10
1/2 (1075)
2...17
13.7
2800
22
1/8 (825)
4...15
4.7
1400
11X10
1/2 (1075)
2...17
13.7
3300
22
1/4 (1100)
4...15
4.7
1450
11X10
1/2 (1075)
2...17
15.7
3300
22
1/4 (1100)
4...15
5.7
1750
11X10
1 (1040)
TABLE 3—MINIMUM AIRFLOW FOR RELIABLE ELECTRIC HEATER OPERATION (CFM)
SIZE 601A030 601A036 601A042 601A048 601A060
AIRFLOW (CFM) 1000* 1200 1400 1600 2000
* The 030 size models must be run on medium or high speed when used in conjunction with 15 kW electric heat accessory
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