R-3310 Complete Heater A/C Upgrade Kit

APPLICATIONS: For Ottawa Kalmar Yardspotters

Yard trucks, spotters, dogs, mules, shunt trucks—no matter what you call them, Kalmar Ottawa yard vehicles are made for productivity.

Now Red Dot is offering the R-3310 underdash HVAC unit to help make this work environment even more productive and comfortable. This kit replaces the current heater with the blower mounting under dash. Offering a cool 17,000 BTU’s and 290 CFM, the R-3310 produces 25% more airflow over the existing heater. It’s an ideal choice when you need an exact-fit replacement that exceeds the performance and reliability of the original.


BTUsHeating 25,000 BTU/Hr @100 F (7.3 kW @ 37.8 C)
Cooling 17,000 BTU.Hr @ 36 F (5 kW @ 2.2 C)
Air Flow290 CFM (493 m3/h)
Voltage19.5 amps @ 13.6 VDC
ControlsThree lever controls:
- Fresh Air/Recirc Air
- Temperature
- Mode
Condenser32” x 23.7” x 1” thick
22,000 BTUs
Motor/FanVented Ball Bearing
FitsKalmar Ottawa Yard Spotters
YT-30 Series, 1998 to 2010
Left-hand cab

R-8230 Underdash Heater/Air Conditioner Unit

APPLICATIONS: Navistar International S, 4000, 7000 and 8000 Series Trucks, 1983-1994

The R-8230 exceeds the performance of the original system and has styling to match the factory dash. Includes the “Max A/C” and “Defrost Interlock” features not offered from the factory. Mounts directly to the firewall and mates to existing inlet and outlet ducting.


BTUsHeating – 29,700 BTU/Hr at 100°F
(kw 8.70 at 37.8°C) air temperature rise

Cooling – 22,400 BTU/Hr with 36°F
(kw 6.56 with 2.2°C) refrigerant temperature
and 80°F (26.7°C) wet bulb entering air
Air Flow265 CFM (450 m3/h)
Weight48 lbs. (22 kg)
MotorPermanent magnet
Current Draw19.5 amps at 13.6 VDC
(includes 4 amps for A/C clutch)
NoteBTU’s and air flow in installed conditions.
Not for viscous fan applications.

R-8825 Underdash Drop-In Evaporator Kit

APPLICATIONS: Navistar International S, 4000, 7000 and 8000 Series Trucks, 1995-2002

The R-8235 drop-in evaporator kit integrates with the OEM housing and blower motor assembly and meets all factory specifications. R-134a compatible.

R-8725/R-8730 Underdash Drop-In Evaporator Kit

APPLICATIONS: Ford L Series Trucks

The R-8725/R-8730 drop-in evaporator kit takes advantage of the OEM housing and blower motor assembly. Includes the installation kit, hose kit, condenser, and evaporator.

Note: Does not fit Ford Aeromax.

R-8820 Underdash Heater/Air Conditioner Unit


The R-8820 heater/air conditioner has a factory-installed look and improved air control and performance over the OE system. Uses existing mounting points for installation in R, U, DM, RL/RS, and RW cabs. Note: Kits for Model LE and MR severe-service applications are available from Mack dealers.


BTUsHeating – 27,000 BTU/Hr @ 100°F
(kW 7.91 @ 37.8°C) air temperature rise

Cooling – 20,000 BTU/Hr with 36°F (kW 5.86 with 2.2°C)
refrigerant temperature and 80°F (26.7°C)
wet bulb entering air
Air Flow250 CFM (425 m3/h)
Weight34 lbs. (15 kg)
MotorPermanent magnet, extended life
Current Draw14 amps @ 13.6 VDC
ControlsThree-speed blower motor switch,
temperature-level and mode-selection lever
ModelsR-8820-1P (tan)
R-8820-2P (grey)