Hylas 54 Specifications | Home (Back to home page of website www.Dakare.com)
Refrigeration and Freezer System
AC 1 HP System Model AC41-002 Passagemaker
DC 1 Hp System Model DC45
Both Systems Feed 3 Holdover Plates
and
Can be run independently and Simultaneously
Freezer and Fridge Gases
Component
|
Date
|
Gas
|
Comments
|
AC Refrigeration
& Freezer
|
4/2001
|
409A
|
 |
AC Motor
|
4/2001
|
 |
1 HP
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DC Refrigeration & Freezer
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3/2003
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R-12
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Upgraded
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DC Motor
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5/2003
|
 |
New 1 HP Leeson Motor -significantly more quiet than original
|
Frig 1 Temp Meter
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4/2001
|
 |
 |
Frig 2 Temp Monitor
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4/2001
|
 |
 |
Freezer Monitor
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4/2001
|
 |
 |
Internal Lighting
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4/2001F
|
 |
For both Fridges & Freezer
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DC Motor Relay
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6/2001
|
 |
More efficient power delivery mechanism
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Vendor Experiences
Ft. Lauderdale and Commissioning:
Vendor Experiences: We had to have our DC refrigeration system serviced. Hylas brought in Neptune Air. We had a continuous set of bad experiences using his service. Of all the contractors who serviced us in Ft. Lauderdale, in our opinion he was the most unprofessional and non reliable vendor we have met. He would continuously say that he would be back the following day, or make an appointment to come on the boat and not show. It would only be after many phone calls, usually after several days, that we would get a phone call saying that he was sorry for not showing up over the previous several days. Not once, in the entire history of our dealings with Neptune Air, did we ever get a phone cal to tell us that he was breaking his appointment. Rather, day after day we were left hanging. The final straw was reached, when on June 1st, I called his office wondering where he was after another 2 day hiatus, when I was informed by his secretary that he had told her that he had completed the work on our system, which was not true. Our total time of continuous frustration with Neptune Air lasted 2 months. Finally, we decided to terminate our relationship with Neptune Air and with the support of Grunert, we have made arrangements to have Beard Marine solve the refrigeration problems.
Beard appeared to get the 2 air conditioning systems and the 2 refrigeration systems up and working properly. However, in checking these systems out in Trinidad, we did find that 2 of the systems were overcharged.
Trinidad:
We were very happy with the work done for us Nauticold in Trinidad. They changed out a bad compressor on an air conditioning unit, serviced our DC motor for our DC refrigeration system, installing new brushes cleaning the armature and repainting the housing of the DC system. They also had to cut the frame for our bed in order to extract the compressor. They made a very nice aluminum bracket that will facilitate future removal of the frame in case future servicing of the units are required. They checked all of our systems (4 total), made valuable recommendations and improvements. I felt more comfortable with the work they did for us then with any of the servicing that we received from any Stateside refrigeration/air conditioner firm. With that said, we were highly disappointed with the fact that we had them replace our brushes as part of a regular maintenance schedule on our DC Reefer motor. Whatever they did, it was bad, for within 30 days of putting the new brushes in, the motor was ruined. It had to be replaced. At the time we were in St. Thomas. When I discussed this issue, Nauticold in Trinidad disavowed any responsibility and would not honor any warranty claims. This was very disconcerting and for that reason, we can not recommend them to anyone.
Herzliya, Israel:
We developed a problem with our AC reefer while cruising the Middle East. We retained two different groups in Herzliya and had no satisfaction. Family issues and work overload distracted the workers from focusing on the job and solving the problem. (See Turkey below.)
Marmaris, Turkey:
We used Beneder in Netsel Marina to fix the problem in our AC Reefer that we encountered while in the Middle East. They were timely and professional. They found the problem very quickly and had the system up and running right away. We were very happy with their services.
System Specifications
The reefer system is composed of two refrigeration units and one freezer. The system has two separate power plants, one AC (125V) and the other DC (12V). The compressors are both powered by a Grunert 1 HP motor driving standard Grunert plates. The Insulation for all three units was completely redesigned and has now become part of the standard insulation process for all Hylas Yachts built since Hull #19. The AC refrigeration system was delivered with 409A gas and the DC system was supplied with 404A gas. While in Trinidad we had the DC system purged and the gas was replaced with R-12. We chose R-12 gas for three reasons: 1) It is easier to service, 2) Unlike 404A, which has 3 separate gases that evaporate at different rates, R-12 is a one gas system facilitating the carrying and storage of spare gas, 3) 404A is not as stable a refrigerant gas as R-12 and will require less servicing overall.

We chose to have 2 separate refrigeration systems for redundancy purposes. We chose to get 1 AC and 1 DC system. We wanted a DC system so we could have some independence from having to be on board every day in order to run the AC system. We are extremely happy that we chose to get the backup system as an AC system because the AC system can be run while the Genset is charging the batteries and all of the charger energy is devoted to charging the battery banks and not running the AC refrigeration system, so our batteries charge faster and our run time for the Genset is greatly reduced.
Dakare has 6 Holdover Plate Temperature Controllers (Shown Below.) There are 2 for each box (2 refrigerators and 1 freezer.) The 2 controllers in each box are use to control either the AC or the DC systems.
Computations for Sizing Freezer & Refrigerators & Insulation
Written in MS Word
Written in MS Excel
Pictures Showing Construction of Boxes with Insulation
Click here to see Temperature Cycle Data for the Freezer and Refrigerator
Can be used to make relative comparisons
First of several layers of Blue Board being fitted to the outside of the reefer system
Lower Reefer
First Layers on the Freezer
Finished lower reefer being placed into position
Gas Types & Pressure Tables for AC & DC Reefer Systems
Current gauge (gas meters) configuration for testing system
System
|
Gas Type
|
Gauge Type
|
Lo Pressure
|
High Pressure
|
Date checked
|
Comment
|
AC 1
|
R-22
|
R-22
|
60
|
220
|
 |
As set during Commissioning
|
AC 2
|
R-22
|
R-22
|
60
|
220
|
 |
As set During Commissioning
|
DC Reefer
|
R-12
|
R-12 (Old)
|
~0
|
95
|
 |
Changed out in Trinidad; 15 lb container of spare gas purchased
- Dry filter changed
|
AC Reefer
|
404A
|
 |
10
|
175
|
 |
Recharged during Commissioning process
|
 |
404A
|
 |
11
|
195
|
2/20/03
|
Done in Trinidad; System pressures OK
- Dry filter Changed
|
 |
404A
|
 |
12
|
170
|
7/6/05
|
Done by Alex in Israel; System recharged and tested for leaks. None found
|
 |
404A
|
 |
 |
 |
9/2006
|
Recharged and tested OK in Lefkus, Greece
|
 |
404A
|
 |
10.5
|
170
|
7/26/08
Water Temp approx 20-22C
|
Done by Marcus in Port Napoleon. Recharged and tested. Found loose gas valve (Blue) - tightened
|
Warnings on Running System
Use in Foreign Countries
The system, in concert with the installed Isolation Transformer, is capable of being driven both in the United States using 60 HZ 220 VAC and in just about all foreign countries using 50 HZ 220-240VAC. The Grunert .System will run at 82% capacity at 50Hz. We have used it in this fashion successfully for 5 years while in Europe.
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