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R-6100: Low-profile, high-performance applications
When it comes to operator comfort, two key selling points for
any vehicle are space and visibility. But big interiors and lots of
window glass add to the demands placed on another critical
comfort item: the air conditioner.
“As a trend, we’re seeing more spacious cabs and larger
windows in every type of vehicle we design for,” says Gary
Hansen, vice president of engineering at Red Dot Corporation,
a leader in heavy-duty mobile HVAC units and replacement parts.
“A rooftop A/C unit is ideal for bigger cabs because it can
deliver high-performance cooling without taking up valuable
interior space.”
Because it’s mounted on the cab’s exterior, a rooftop A/C unit
should be purpose-built to handle impact, vibration, and other
demanding operating conditions, Hansen says. He offers these
tips below to help you make the right choice.
How to spec the right rooftop A/C unit to make sure it delivers the performance customers expect.
Red Dot’s R-6100 is the ideal low-profile rooftop A/C unit
for commercial trucks and other on-highway equipment. It
produces a strong, steady stream of cool air—16,000 BTU/hour
and airflow of 265 CFM. At that rate, the operator can work with
the door open and still feel the effects of spot cooling.
Why it’s different: The R-6100 extends just 7.4 inches above
the roofline so it won’t interfere with bodies or other equipment
that may protrude over the cab. Beneath the sleek, roto-molded
housing is a tightly integrated package of components designed
for long life and efficiency. For example:
• Tube-and-fin coil construction ensures strong condenser
performance in dusty, dirty conditions. The copper tubing
is 0.022 inches thick, resulting in an effective, lightweight,
rugged coil.
• The sealed motor is a permanent magnet type with a slinger
ring and hubcap for weather protection. The condenser unit’s
fan is aluminum with a heavy-duty spider and riveted blades.
• A high-capacity, spring-loaded receiver drier helps stop
moisture from compromising the performance and life
of the system.
It also saves space inside. The R-6100 ceiling plenum houses
the controls for the blower and thermostat as well as a cab air
filter yet protrudes barely 1.5 inches below the headliner.
Applications: Heavy and medium-duty trucks and other on-
highway equipment cabs that require a low-profile rooftop unit.
Ordering information: See page 473.
No rooftop mobile A/C unit has a more proven track record than
the Red Dot R-9727. It delivers 22,000 BTU/hour of cooling and
airflows of 320 CFM (evaporator) and 850 CFM (condenser),
and its durability and performance are best-in-class for rugged
on and off-road environments.
Why it’s different: Some units may look like the R-9727 but
only the real thing will deliver the performance and durability
equipment owners expect.
The R-9727’s robust components are housed in a heavy-
gauge steel casing that’s gusseted and reinforced to increase
its structural integrity. “Little things add up to a more durable,
reliable unit,” Hansen says.
For example, Red Dot use a sealed, long-life evaporator and
condenser motor with a slinger ring and hubcap for protection
from weather and dust. Instead of using several small hinges
for the service panel, the R-9727 has one continuous stainless
steel piano hinge. The result is a stronger joint that contributes
to the rigidity of the housing while ensuring accessibility to the
components when service is necessary.
New for 2011: Red Dot will offer a hydraulic compressor
upgrade kit for the R-9727 that attaches to the back of the unit,
the perfect solution when you can’t run the compressor directly
from the engine.
Applications: Mining, agriculture, construction.
Ordering information: See page 474.
R-9727: Robust and rugged rooftop A/C
Red Dot’s R-9976 hydraulic compressor gives you flexibility on
applications where an engine-mounted compressor isn’t the
best option for a rooftop A/C unit.
The R-9976 direct-drive hydraulic compressor requires no belts
or clutch and minimizes A/C hose length - ideal for cranes and
articulated equipment where the cab and engine are far apart.
Available in displacements of 5 and 9.3 cubic inches.
Ordering information: See page 68, 93, 476.
R-9976 Hydraulic Compressor: Flexibility for tough installations
470 Contents Index
Replacement Parts & Service: Align your Preventative Maintenance (PM) schedules
Scheduled preventive maintenance is the best way to make sure an A/C system is effective and efficient. Start by synchronising
your HVAC parts replacement with engine lube intervals. The accompanying chart shows you how.
“Most HVAC PM intervals involve a three-month, six-month or annual inspection,” says Hansen. “When a vehicle is in for scheduled
service, follow the recommended inspection schedule for the compressor and belt-drive system, condenser, receiver-drier,
expansion valve and evaporator.”
Cool, clean, reliable air is vital to operator safety as well as comfort. Promote regular preventive maintenance and quality all-makes
parts and you’ll generate HVAC parts and service business all year long.
It’s A/C season all year
The best way to cut down on A/C-related repair costs is to incorporate inspections into your overall PM routine.
Here’s where to start:
Maintenance Interval (Months) 3 6 12
1. Annual System Maintenance
Perform manifold gauge check. If gauge pressures indicate low refrigerant charge:
1) Recover and recycle refrigerant; 2) Perform system evacuation and leak test; 3) Recharge system •
2. Compressor & Belt Drive System
Once a month, engage the A/C and run the system for 5 minutes to lubricate the compressor and
verify that the condenser (engine) fan engages and disengages
Check discharge line (warm or hot to touch) •
Check suction line (cool to touch) •
Inspect face of clutch hub for signs of slippage (heat discoloration) •
Check clutch working voltage and current draw •
Inspect shaft seal for oil or dirt (indicates leakage) •
Confirm clutch pulley alignment with crankshaft drive pulley •
Inspect idler pulley for bearing wear (looseness) •
Inspect compressor belt for glazing or cracking •
Check belt tension •
3. Condenser
Clean dirt and bugs from condenser fin area (more frequently if necessary) •
Inspect fins and straighten as necessary •
Inspect tubes for dents and stains (indicating leakage) •
4. Receiver Drier
Replace annually or after the system has been opened •
Check sight glass for signs of moisture or bubbles •
Check inlet line from condenser (warm to touch) •
Check temperature of drier canister (warm to touch) •
5. Expansion Valve
Check inlet (liquid) line from drier (warm to touch) •
Inspect refrigerant charge head for damage and leakage •
6. Evaporator
Clean dirt and bugs from evaporator fin area (more frequently if necessary) •
Check temperature of copper inlet plumbing tube behind expansion valve (same temperature as outlet tube) •
7. Other Components
Thermostat: Check for proper operation •
Air filters: Check for restriction; clean or replace as required •
Pressure switches: With manifold gauges installed, check for proper operation •
Water valve: With control panel temperature setting on full "cold," check valve for full closure and
adjust cable as needed•
Credit: Red Dot Corp.
471Contents Index
R9757 SERIES
R97570PRed Dot Rooftop Air Conditioner / Heater 12V
• Height: 292mm
• Width: 657mm
• Length: 857mm
• Weight: 61kg
• BTU’s: 25000 cooling
• BTU’s: 45000 heating
R9757024PRed Dot Rooftop Air Conditioner / Heater 24V
Part No. DescriptionRed Dot
Ref. No.
Page
No.
RD550491P Motor Dual Shaft 12V 73R4422 14
RD550492P Motor Dual Shaft 24V 73R4424 17
RD580920P Evaporator Blower Wheel CW 73R7200 22
RD580921P Evaporator Blower Wheel CCW 73R7210 22
RD447240P Condenser 77R0660 185
RD587474PCondenser Fan Assembly
12V 13”73R8652 262
RD587475PCondenser Fan Assembly
24V 13”73R8654 262
RD587901P Fan Guard Assembly N/A
RD227910P Evaporator Coil 76R6015 242
RD113790P Heater Coil 76R1860 334
RD568680P Block TX Valve 71R8301 495
RD572720P Receiver Drier 74R2546 448
RD577601P Water Valve Assembly 72R5220 N/A
Part No. DescriptionRed Dot
Ref. No.
Page
No.
RD568330P High Pressure Switch 71R7075 393
RD536470P Resistor 71R1450 482
RD5453124P Thermostat 71R3200 582
RD566900P Relay 12V 71R1902 483
RD566930P Relay 24V 71R1904 483
RD569172P Control Cable Water Valve 72R9005 N/A
RD559280P Control Knob 71R4040 483
RD563951P Low Pressure Switch 71R6040 393
RD364010P Plenum Plastic Assembly 477
RD41232P Mode Switch ON - OFF - ON 71R0200 481
RD500710P Fan Switch ON - OFF - ON 71R0400 482
RD538460P Louvre Assembly 4.5” 72R3200 368
657mm
857mm
292mm
857mm
472
Rooftops
Contents Index
188mm
326mm
642mm
257mm
790mm
R6100 SERIES
R61000PRed Dot Rooftop Evaporator Assembly 12V
• Height: 188mm
• Width: 642mm
• Length: 790mm
• Weight: 20kg
• BTU’s: 16000 cooling
R6100024PRed Dot Rooftop Evaporator Assembly 24V
Part No. DescriptionRed Dot
Ref. No.
Page
No.
RD211890P Cover Assembly Outer 477
RD572970P Fan Blade 73R8100 268
RD571290P Motor 12V 73R0542 7
RD5712924P Motor 24V 73R0544 12
RD572720P Receiver Drier 74R2546 448
RD545830P Pressure Switch Trinary 71R7550 392
RD447380P Condenser Coil 77R0620 N/A
RD211950P Evaporator Coil 76R5500 243
RD568680P Block TX Valve 71R8301 495
RD566900P Relay 12V 71R1902 483
RD566930P Relay 24V 71R1904 483
RD412536P Thermostat 71R2250 522
Part No. DescriptionRed Dot
Ref. No.
Page
No.
RD573120P Blower Wheel CCW 73R6300 22
RD551211P Motor Dual Shaft 12V 73R4262 14
RD5512124P Motor Dual Shaft 24V 73R4254 117
RD573110P Blower Wheel CW 73R6350 22
RD536470P Resistor 71R1450 482
RD209610P Roof Seal 477
RD212970P Plenum Gasket 477
RD538460P Louvre Assembly 4.5” 72R3120 368
RD559280P Knob 71R4040 683
RD536460P Switch 3 Speed Rotary 71R1150 481
RD212900P Plenum Diffuser Assembly 477
RD559370P Recirculating Filter 78R5300 222
473
Rooftops
Contents Index
R9727 SERIES
R97271PRed Dot Rooftop Evaporator Assembly 12V
• Height: 264mm
• Width: 624mm
• Length: 768mm
• Weight: 47kg
• BTU’s: 22000 cooling
R9727124PRed Dot Rooftop Evaporator Assembly 24V
Part No. DescriptionRed Dot
Ref. No.
Page
No.
RD435860P Condenser 77R0350 185
RD211212P Evaporator Coil 76R7100 243
RD536470P Resistor 71R1450 482
RD568680P Block TX Valve 71R8301 495
RD570611P Receiver Drier 74R2536 447
RD546400P Pressure Switch Binary 71R7000 392
RD571290P Motor 12V 73R0542 7
RD5712924P Motor 24V 73R0544 12
RD435080P Fan Blade Condenser 73R8110 268
RD5375712P Motor Dual Shaft 12V 73R4202 14
RD5375724P Motor Dual Shaft 24V 73R4254 17
Part No. DescriptionRed Dot
Ref. No.
Page
No.
RD310638P Blower Wheel Evaporator CW 73R6101 22
RD310639P Blower Wheel Evaporator CCW 73R6151 23
RD412536P Thermostat 71R2250 522
RD536460P Switch 3 Speed Rotary 71R1150 481
RD559280P Knob 71R4040 483
RD209610P Roof Seal 477
RD212900P Plenum Diffuser Assembly 477
RD538460P Louvre Assembly 4.5” 72R3120 368
RD559370P Recirculating Filter 78R5300 222
RD538605PComplete Blower Evaporator
AssemblyN/A
264mm
320mm
624mm
257mm
768mm
474
Rooftops
Contents Index
R9777 SERIES
R97770PRed Dot Rooftop Heater / Evaporator Assembly 12V
• Height: 200mm
• Width: 760mm
• Length: 940mm
• Weight: 30kg
• BTU’s: 25000 cooling
• BTU’s: 45000 heating
R9777024PRed Dot Rooftop Heater / Evaporator Assembly 24V
Part No. DescriptionRed Dot
Ref. No.
Page
No.
RD453780P Condenser 77R1290 186
RD234130P Evaporator Coil 76R5820 243
RD585830P Blower Motor Assembly 12V 73R5552 2
RD5453124PThermostat Side &
Bottom Mount71R3200 522
RD595130P Block TX Valve 71R8380 495
RD545830P Pressure Switch Trinary 71R7550 392
RD572720P Receiver Drier 74R2546 448
RD592241P Water Valve Cable Operated 72R5285 338
RD590763P Condenser Fan Assembly 24V 73R8644 262
Part No. DescriptionRed Dot
Ref. No.
Page
No.
RD585831P Blower Motor Assembly 24V 73R5554 3
RD566900P Relay 12V 71R1902 483
RD566930P Relay 24V 71R1904 483
RD598330P Switch Rotary 3 Speed 71R1160 481
RD589670P Switch Rocker 71R0840 482
RD590770P Recirculating Filter 78R5410 222
RD594370P Resistor 12V 71R1402 482
RD594450P Resistor 24V 71R1401 482
760mm
940mm
200mm
940mm
475
Rooftops
Contents Index
RD539050PFilter Assembly
To suit R9727, R9757, R9800, R9777,
Universal Applications
• Ref. No. 78R5000
• Diameter: 260mm
• Length: 457mm
• Complete with all fittings
to mount directly to rear of unit
SPX012Flexible Air Tube
• 73mm x 10m
RD542960PIn-line Booster Pressuriser
• Ref. No. 73R9202
• 12V
• Inlet: 100mm
• Outlet: 75mm
• Weight: 3kg
RD542961PIn-line Booster Pressuriser
• Ref No. 73R9202
• 24V
RD564271PRubber Elbow
• Ref. No. 78R5500
• Inner diameter: 75mm
R99761PTo suit Hydraulic Axial Direct Drive
• The perfect solution when you can’t run the compressor directly from the engine
• GPM: 1.1 - 6.3
• Displacement: 9.3 cu.in.
SPX0443” Pre-cleaner
To suit RD539050P
RD554320PReplacement Filter Element
• Ref. No. 78R5210
RD5109720PDrive Coupler
RD5124830PNeoprene Spider
RD5112090PElectronically Piloted
Hydraulic Control Valve
• Ref. No. 72R9904
• 24V
• Normally open
RD5112100PConverts RD5112090P
from 24V to 12V
• Ref. No. 72R9912
476
Rooftops
Contents Index
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