Dometic 000 BTU User manual

How to Select, Specify, Operate & Maintain

Dometic APU-Based Auxiliary Air Systems

n7,000, 10,000 and 14,000 BTU/hr capacities for all

size sleepers.

• Self-contained package units

• Patented split systems with reusable

precharged refrigerant linesets

nHeating options:

• 1- 4 kW built-in electric heat modules.

• Interface with installed diesel-re heaters.

nNo special tools required to install.

n

Turnkey package includes all components needed

to complete installation.

n

Backed by extensive application engineering

support and nationwide service.

n

Designed and built for over-the-road conditions and

thoroughly eld-tested.

Dometic Corporation, Environmental Division, with a 45+ year heritage in

rugged HVAC technology for harsh-environment applications, has developed

a range of auxiliary air conditioning and heating solutions to meet the increasing

demand for engine-off comfort control in the trucking industry.

You can count on Dometic for thoroughly engineered products designed for the

harshest over-the-road conditions backed by unmatched factory support and

after-sale service. That’s why so many leading APU manufacturers currently

specify or recommend Dometic HVAC with their products for the trucking market.

In this booklet, we’ll explain all aspects of selecting, specifying, operating and

maintaining your APU-powered auxiliary air system from Dometic. We encourage

you to read this information carefully to help you make decisions. If you have any

questions, please call us and we’ll be delighted to help you.

How to Select, Specify, Install, Operate & Maintain Dometic APU-Based Air Systems 2

The basic principle of an air conditioner is the transfer of heat from one place to another – in this case

from the inside of your vehicle to the outside. This is accomplished by absorbing heat from the inside

air into a refrigerant gas owing through an evaporator coil. The refrigerant is then pumped to a condenser,

where the heat is released to the outside air. The refrigerant, a chemical with a low evaporation temperature,

ows around a closed loop, driven and pressurized by a compressor. As a part of the cooling process, the

air conditioner also removes moisture from the inside air, which makes the area feel more comfortable and

keeps the compartment dry and mildew-free.

A belt-driven compressor on the truck’s engine supplies air conditioning whenever the engine is running. To

keep the driver comfortable when the engine is shut down, it is necessary to have a separate auxiliary air

conditioning system that uses an alternative source of power.

The auxiliary air system runs on 115 Volt AC power, which can be supplied by an onboard diesel genset,

often referred to as an auxiliary power unit, from a shorepower connection when an external AC power

source is available or in some cases from the truck’s batteries using an inverter to convert the 12 Volt battery

output into usable 115 Volt AC power. In this booklet we will focus on the APU-based solutions. In the next

chapter we will provide an overview of your air conditioning choices.

How to Select, Specify, Install, Operate & Maintain Dometic APU-Based Air Systems 4

There are two basic types of auxiliary air systems:

• Self-contained “package” units

• Split systems

The self-contained unit is designed to be wholly

mounted inside the truck, usually under a berth

or seat or inside a side storage locker. All of

the air conditioning components, including the

compressor, condenser, evaporator, blower and

power supply, are mounted on a single low-prole

chassis with an aluminum cover. The system’s

closed refrigerant loop is precharged and sealed

at the factory. Inside air is pulled across the

evaporator coil, and cooled air is blown through

a exible duct to a discharge grill for discharge

into the living area. Hot air is discharged from the

condenser through cutouts in the oorboard.

Dometic’s patented split systems consist of two

separate modules. The outside unit contains

the condenser and cooling fan. It can be bolted

horizontally to the underside or vertically to the

back of the sleeper. The inside unit contains the

compressor, evaporator, blower, power-logic

box and other associated components.The

compressor is covered by a sheet-metal cover.

The inside unit is mounted under a berth or seat

or in a side storage locker. The two units are

connected by reusable precharged quick-connect

refrigerant linesets. The system is designed so

that both units automatically charge to the correct

refrigerant pressure as soon as the linesets are

connected. No special tools are required.

Each approach offers advantages and

disadvantages. A self-contained unit is simpler to

install and maintain, since it does not have any

external refrigerant lines. It is also less expensive

than a split system of the same BTU/hr capacity.

On the other hand, it takes more interior space,

and it requires cutting holes in the oor for air to

ow to and from the condenser. A split system, on

the other hand, has more installation exibility and

uses less interior space. It also is quieter, since the

condenser fan is located outside the truck.

Both types of air conditioning systems are

available with a selection of built-in electrical

heat modules. The heat is blown through the

same ducts and grills and controlled by the same

thermostat. They can also be used in conjunction

with a diesel-red heater if desired, under control

of the same thermostat.

Split Systems

Model Cool Capacity

(BTU/hr) Heat Capacity Control Height Width Length Weight Cool Amps Heat Amps Refrigerant

Internal Unit – Evaporator/Heater/Compressor

ECEQ7 7,000 Cooling Only Smart Digital 11.75"10.25"19.25"53 lb. 7.3 N/A R417a

EHCEQ7 7,000 1 kW Smart Digital 11.75"10.25"19.25"53 lb. 7.3 8.2 R417a

ECEQ10 10,000 Cooling Only Smart Digital 11.63"11.12"20.19"60 lb. 11.8 N/A R417a

EHCEQ10 10,000 7,500 BTU/hr

Espar Ready Smart Digital 11.63"11.12"20.19"60 lb. 11.8 1.0 R417a

EHCEQ10 10,000 1.5 kW Smart Digital 11.63"11.12"20.19"60 lb. 11.8 13 R417a

EHCEQ10 10,000 2 kW Smart Digital 11.63"11.12"20.19"60 lb. 11.8 17 R417a

ECEQ14 14,000 Cooling Only Smart Digital 11.69"13.00"22.00"64 lb. 14.5 N/A R417a

EHCEQ14 14,000 1.5 kW Smart Digital 11.69"13.00"22.00"64 lb. 14.5 13 R417a

EHCEQ14 14,000 2.5 kW Smart Digital 11.69"13.00"22.00"65 lb. 14.5 21 R417a

EHCEQ14 14,000 2.5 kW,

2-stage Smart Digital 11.69"13.00"22.00"65 lb. 14.5 11.4 + 10.4 R417a

EHCEQ14 14,000 4.0 kW,

2-stage Smart Digital 11.69"13.00"22.00"65 lb. 14.5 23.2 + 12.1 R417a

External Unit – Condenser

ACCD7 7,000 N/A N/A 6.125"11.3125"21.875"10 lb. N/A N/A R417a

ACCE10 10,000 N/A N/A 6.125"12.50"24.50"12 lb. N/A N/A R417a

ACCE14 14,000 N/A N/A 6.625"12.50"24.50"13 lb. N/A N/A R417a

Self-Contained Systems

ASCF7 7,000 Cooling Only Mechanical 12.5"15.25"21.50"62 lb. 8.5 N/A R22

ASCEQ7 7,000 Cooling Only Smart Digital 11.94"17.75"24.00"70 lb. 8.9 N/A R417a

ASCEQ7 7,000 7,500 BTU/hr

Espar Ready Smart Digital 11.94"17.75"24.00"70 lb. 8.9 1.8 R417a

ASCEQ7 7,000 1 kW Smart Digital 11.94"17.75"24.00"71 lb. 8.9 9.5 R417a

ASCEQ7 7,000 1.5 kW Smart Digital 11.94"17.75"24.00"71 lb. 8.9 13.4 R417a

ASCDQ10 10,000 Cooling Only Smart Digital 12.50"20.87"28.25"91 lb. 12.9 N/A R22

ASCDQ10 10,000 1.5 kW Smart Digital 12.50"20.87"28.25"91 lb. 12.9 13.9 R22

ASCDQ10 10,000 2 kW Smart Digital 12.50"20.87"28.25"91 lb. 12.9 18.2 R22

ASCDQ14 14,000 2 kW Smart Digital 12.50"20.87"31.50"104 lb. 15.7 19.0 R22

ASCDQ14 14,000 2.5 kW Smart Digital 12.50"20.87"31.50"104 lb. 15.7 23 R22

Heating Capacity Application*

1.0 kW 48 in. sleeper

1.5 kW 60 in. sleeper

2.0 kW 72 in. sleeper

*Under normal conditions. Whichever

type of system you select, it will come

with ducts, grills, condensate drains,

thermostat controls and electrical wiring.

How to Select, Specify, Install, Operate & Maintain Dometic APU-Based Air Systems 6

About Insulation

Before we go any further, let’s talk briey about insulation. Most truck sleepers today are insulated with a

value of approximately R 1 to R 1.25. Compare this to the insulation of R 30 that is required in most new

housing construction. Even the “cold-weather packages” offered with some new trucks only have insulation

values of R 2. TMC recommended practices call for R 4.2 as a standard insulation package and greater

than R 4.6 in a premium package. This standard, once adopted by the industry, will go a long way toward

improving the performance of auxiliary air conditioning and heating systems.

If you are buying a new truck, you should order it with additional insulation. There are also a number of

measures you can take to reduce the heat load in your truck. If you have skylights, cover them. Insulate

the oors with foam under the carpet. Add insulation to the doors. Get heavy-duty curtains to separate the

sleeper from the cab. Cover the windshield and windows with reective shades when parked. Park in the

shade whenever possible. Switch off heat-producing appliances in the sleeper.

Air Conditioning Units

Your rst step will be determining the type of air conditioning units (split or self-contained) to meet your

requirements and space constraints, then sizing the units to meet the expected heat load.

Sizing the system can be a complicated affair, since it depends on a number of factors, such as the size and

shape of the sleeper, the amount of insulation (see above), the size and location of windows, the color of the

truck (darker colors absorb more heat) and the ambient temperature outside. The following guidelines are

based on TMC recommendations under “average” conditions. If you are operating in very hot regions, you

may need to consider extra capacity.

7,000 BTU/hr Day cab or smaller sleeper up to 48 with ﬂat roof

10,000 BTU/hr Mid-size 60 sleeper with low or mid-height roof

14,000 BTU/hr Full-size 60-72 sleeper with high-rise roof

Auxiliary Power UniT

When running the air conditioner from an APU, the genset must be large enough to start and run the air

conditioning unit as well as any other electrical appliances you may wish to run at the same time. This can be

complicated, since gensets from different manufacturers may vary considerably in their output characteristics.

If you measure the output of two gensets rated by their manufacturers at 2.5 Kilowatts, you will observe them

to be very different.

It’s also important to allow for the surge capacity needed to start the air conditioning compressor. Each

time the compressor cycles on, there is a short electrical surge that is equal to about four times the normal

running amps for several hundred milliseconds. Most good-quality gensets are designed to support these

short surges without tripping off the line.

Capacity in BTU/hr Genset Minimum Output

(Continuous kW)

Genset Minimum Surge

Amps

7,000 2.0 38

10,000 2.5 60

14,000 3.0 70

Shorepower

Although there are relatively few shorepower hookups available at truck stops, rest stops and terminals,

these will become more readily available in the future.

TMC recommends a minimum 20-amp circuit for shorepower connections. You should use any heavy-duty

power cord with a standard three-prong plug. Remember that there will be a voltage drop across the cord, so

you should use the minimum length necessary to reach your outside power source.

12 Gauge Cord Up to 25'

10 Gauge Cord Up to 50'

How to Select, Specify, Install, Operate & Maintain Dometic APU-Based Air Systems 8

Installation

Dometic will provide detailed installation instructions with your system. You should make sure you understand

these instructions and follow them completely.

Note that the APU must be set to deliver 115 Volt 60 Hz output in order for the air conditioner to function

properly. Check with your APU supplier.

Controls

The Dometic auxiliary air system comes with a standard digital thermostat/display unit. Operation is intuitive

and easy, with up and down arrows to adjust the setpoint and fan speed.

Optimizing Performance

To improve the air conditioner’s performance on a hot day, you can reduce the heat load by parking in a

shaded area, covering the windows with reective shades to block out direct sunlight and pulling the curtain

between the sleeper and cab. Make sure windows and doors are tightly closed, and turn off any other heat-

producing appliances.

Operation and Maintenance

You should inspect and clean the air lter regularly to ensure good airow across the evaporator coils. You

will nd the lter in the return air path, either directly behind the grill or in front of the evaporator coil.

Make sure you do not block the airow between the return air grill and evaporator coil with pillows, blankets,

papers or other objects.

Check the condensate drain often to make sure water is draining properly. Make sure the drain ttings do not

get clogged. Note that the drain hose under the truck should be tied in a loop so as to form a natural trap.

This will help prevent outside air and exhaust discharge from getting inside.

If you have a split system with external condensing unit, make sure you inspect and clean any debris from

condenser coil area to ensure good air ow.

Dometic’s auxiliary air systems, both self-contained and split, are designed so that you should never need to

recharge the refrigerant loop under normal circumstances. If the refrigerant level ever needs to be adjusted,

federal law requires that it must be done by an EPA-licensed HVAC technician with the proper tools to avoid

accidental discharge of any refrigerant gas into the air.

Occasionally check for chafe on outside wires and refrigerant lines (split systems).

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