EnviroComfort Installation Manual
This Manual
L-2657 ENGLISH
1
INTRODUCTION
T
HIS
M
ANUAL
This manual provides proper installation information for the EnviroComfort
TM
air conditioning system. Where applicable, be sure
to follow the instructions that pertain to your model. Improper installation procedures can result in unsatisfactory performance
and/or premature failure of the air conditioning unit.
Before proceeding, read this manual completely.
If there are any statements or procedures in this manual that you do not
understand, contact the Applications Department of Dometic Marine for assistance. Phone (954) 973-2477 Monday through
Friday, 8:00am - 5:00pm Eastern Time. After hours (evenings and weekends) technical support is offered through Dometic's
24/7 Hotline at (888) 440-4494, or by fax at 954-973-2477, or by email at [email protected].
In the interest of product improvement, Dometic’s specifications and design are subject to change without prior notice.
T
HIS
P
RODUCT
The EnviroComfort air conditioning system provides year-round comfort on your boat with both cooling and heating capabilities.
A compact Dometic Digital Display temperature control operates the system. For flexibility in connecting to ductwork, the high-
velocity blower is rotatable to either a horizontal or vertical position. The compact, space-saving design is contained in a
stainless-steel drain pan, and the pre-installed air filter is easily removable and cleanable. The plastic electrical box is remote-
mountable for added convenience.
H
OW
I
T
W
ORKS
The basic principle of an air conditioning system is a liquid absorbs heat as it turns into a gaseous state (evaporates) and
releases heat as it turns back into a liquid state (condenses). The system consists of five main components:
•
Evaporator
- Absorbs heat from air flowing across the coil.
•
Fan or Blower
- Blows air across the evaporator coil.
•
Condenser
- Releases heat to the seawater.
•
Compressor
- Drives the refrigerant through the loop.
•
Metering Device
- Meters the flow of refrigerant to the evaporator.
The air conditioner’s refrigerant compound has a very low boiling point. It flows in a closed loop between an evaporator and a
condenser, alternately absorbing and releasing heat. The heat absorbed by the refrigerant is transferred to the seawater. This
process cools and dehumidifies a space by removing heat and moisture, replacing hot moist air with cool dry air. The moisture it
removes condenses and drips into a collection pan, where it drains away. There should be a temperature difference of 15 to 20
degrees from the return air to the supply air.
A water pump circulates seawater through the inner tube in the condenser coil, which cools the refrigerant in the outer tube and
condenses it from a gas into a liquid. The heat from the refrigerant is exchanged to the seawater and discharged overboard.
The liquid refrigerant is then pumped through the evaporator coil and the cycle repeats.
When in Heating Mode, a reversing valve in the refrigerant line reverses the flow and the evaporator and condenser change
roles. Heat is absorbed from seawater and released into conditioned space.
The Effect of Seawater Temperature
Whether in Cooling Mode or Heating Mode, the temperature of the seawater affects the air conditioner’s efficiency and capacity.
In Cooling Mode,
the system is most efficient when the water temperature is 55-80°F (13-27°C). At water temperatures above
90°F (32°C), the water’s ability to absorb heat diminishes, so the capacity of the system decreases. Also, when water
temperature increases above 90°F (32°C), the system could sustain a high-pressure shutdown to protect the compressor.
In Heating Mode,
the system is most efficient when the water temperature is above 50°F (10°C). At water temperatures of 40°F
(4.4°C) or below, the water’s ability to provide heat diminishes, so the capacity of the system decreases. Also, as the water
temperature decreases, the system could sustain a low-pressure shutdown to protect the compressor.
CAUTION
Extreme care should be taken in operating any unit below seawater temperatures of 40°F (4.4°C). The seawater could
freeze in the condenser tubing, possibly causing it to burst, which is not covered by the warranty.
Содержание EnviroComfort ECD
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