MABRU POWER SYSTEMS SC Series User manual

MARINE SELF
CONTAINED
AIR CONDITIONING
SYSTEM
INSTALLATION MANUAL

Introduction
Safety Precautions
Installation - Overview
Installation - Ducting
Installation - Seawater System
Installation - Checklist
Control Panel Operation
WIRING DIAGRAM FOR 12V DC
WIRING DIAGRAM FOR 115/230V FOR AC
Troubleshooting
Warranty & Returns
Error Codes
03
04
27
06
08
09
14
16
21
20
22
24
TABLE OF CONTENTS
[phone] suppor[email protected]

INTRODUCTION
Thank you very much for purchasing our SC series marine self-contained air conditioning unit!
This manual provides proper installation information on the Mabru air conditioning units (a/c units). Improper
installation procedures can result in unsatisfactory performance and/or premature failure of these ale units.
Before proceeding, please read this manual completely. If there are any statements or procedures in this manual
that you do not understand, contact Mabru Power Systems for assistance.
Phone [phone] (out office time is 8 am to 4.30 pm US Eastern Time), or email suppor[email protected].
Please see the separate control operation manuals for installation of digital or mechanical controls. Mabru a/c
units are covered under the existing Mabru Limited Warranty. The Warranty is available on the last page of this
manual. In the interest of product improvement, Mabru's specifications and design are subject to change without
prior notice.
When sizing air conditioning systems for a boat, the area in question is not that important. The success to select
the correct size and capacity in BTU should be determined not only by the area (cubic feet), but also the amount
of windows, the quality of the window tint, the color of the hatches, the heat dissipation from the appliances on
board, and so many other factors.
The question should not be, how many BTU do customers need to cool their cabin?
It is impossible in reality to answer that question before studying the insulation.
[phone] suppor[email protected]
FREQUENTLY ASKED QUESTIONS REGARDING THE SIZE AND CAPACITY SELECTION:
1When installing the unit in areas where the unit could return air from bilges or engine rooms and exterior, you
must seal the compartment well, so return air must be from the area that you want to cool.
2Discharge vents: Less vents the better. The air conditioner needs air circulation, this way dry air reacts on the
skin evaporating the moisture and creating a cooling effect. In conclusion, a dry boat well ventilated is more
important than a cool boat.
3After over 35 years testing and creating some of the best marine units, we must conclude that the most impor-
tant fact about marine air conditioning is the source of power and the efficiency. Nowadays, customers during
hot days run their air conditioning on solar panels and at night on Lithium batteries.
POINTS TO HAVE IN MIND WHEN SELECTING YOUR AIR CONDITIONER:
Page No.3

SAFETY - PRECAUTIONS
[phone] suppor[email protected]
THE FOLLOWING IS A SUMMARY OF THE LABELS ON THE UNIT:
Never install your air conditioner in the bilge or engine room areas. Ensure that the selected location is sealed
from direct access to bilge and/or engine room vapors. Do not terminate condensate drain line within three feet
of any outlet of engine or generator exhaust systems, nor in a compartment housing an engine or generator, nor
in a bilge, unless the drain is connected properly to a sealed condensate or shower sump pump.
Safety Warning - The ale unit should never be placed such that it can circulate carbon monoxide, fuel vapors or
other noxious fumes into the boat's living spaces. Do not install or operate a self-contained unit in the engine
room or near an internal combustion engine. Failure to follow these precautions could result in serious injury or
death.
Danger - Electrical shock hazard. Disconnect voltage at main panel or power source before opening any cover.
Failure to comply may result in injury or death.
Warning - This component does not meet federal requirements for ignition protection. Do not install in spaces
containing gasoline engines, tanks, LPG/CPG cylinders, regulators, valves or fuel line fittings. Failure to comply
may result in injury or death.
Warning - To minimize the hazard of electrical shock and personal injury, this component must be effectively
grounded. Refer to the installation guidelines for further information.
Ignition Protection Warning - Self-contained units do not meet federal requirements for ignition protection. Do
not install in spaces containing gasoline engines, tanks, LPGICPG cylinders, regulators, valves or fuel line fittings.
Failure to comply may result in injury or death.
Prior To Installation - Read these instructions completely and then plan all connections which must be made to
the ale unit including ducting, condensate drain line, seawater inlet and outlet hoses, electrical power connection,
location of control, and seawater pump placement to ensure easy access for routing and future servicing.
Blower Rotation - Rotate the blower to the direction which allows the most direct airflow discharge through the
ducting. Loosen the adjustment screw on the blower mount ring, rotate the blower to desired position, and then
tighten adjustment screw.
Page No.4

[phone] suppor[email protected]
Placement of A/C Unit - The Mabru condensate base pan is equipped with vibration isolators installed in the
bottom of the pan. These isolators are designed to dampen the vibration caused by the operating ale unit from
transferring into the mounted surface. Care must be taken when moving the ale unit across mounting surfaces
as isolators can be damaged. Isolators will not normally pull out of the pan, but can turn sideways if dragged and
may break if excessive dragging occurs. Unit must be picked up after moving to allow the isolator to reset into
the well or vibration isolation will be ineffective. The ale unit must be mounted to a low flat level surface, in the
bottom of a locker, under a bunk or dinette seat, or in a similar location. Read the safety considerations above and
see Figure 1 before mounting the unit.
A/C unit must be placed in a well-ventilated area. Never screw the unit directly into the hull.
Do not install A/C unit in engine room or bilge compartment.
Note: Air absorbed from A/C unit inflow into the room. Never place the unit in an engine compartment that is
likely to produce poisonous gas.
A/C unit is composed of some equipment that produces vibration or noise. Mount the unit in a horizontal floor
with positive inclination towards drain to minimize sitting water in the drain pan.
Install seawater inlet as low as possible.
Scoop type thru-hull, ball valve, strainer, and sea water pump must be installed below the water line.
Install inlet (return) grille as low as possible and outlet (discharge) grille as high as possible.
Adjust the air outlet (blower position) by loosening the lock screw and securing the screw tightly once the air
outlet is adjusted at the optimal location.
Page No.5
Sea water inlet facing bow

INSTALLATION - OVERVIEW
Mount unit with condenser/evaporator coil directly behind return air grill or with at least 3" (76mm) of air circula-
tion clearance if adjacent to a bulkhead or other obstruction. Compressor should be mounted away from return
air grill if possible, to minimize sound level in cabin.
Mounting Brackets - The four mounting brackets provided should be placed around edge of drain pan as equally
spaced as possible. Secure ale unit to a flat level mounting surface. Customer is to supply screws or bolts.
Route condensates drain hose to a sealed condensate or shower sump pump (see note below).
Drain hose must be routed downward to allow water to flow via gravity downhill.
Do not terminate condensate drain line within 3' (.91M) of any outlet of engine or generator exhaust systems, nor
in a compartment housing an engine or generator, nor in a bilge, unless the drain is connected properly to a sealed
condensate or shower sump pump. If drain line is not properly installed, then dangerous fumes may travel up drain
line and contaminate living quarters.
Ethernet cable
Touch screen thermostat control
Insulated tape
Stainless steel clamps.
(Mabru 12V Raw water pump included in the
SC DC 12 Volts units Only)
Very Important!
Items included in the box.
[phone] suppor[email protected]
Page No.6

[phone] suppor[email protected]
Air Filters - Air filters are necessary to remove air borne particulates from the cabin air and to keep the evapo-
rator coil clean. One, and only one, air filter must be installed for each air conditioner unit. Install the air filter
either on the ale unit or in the return air (RA) grill. The ale unit air filter mounts in the slots in front of the evapora-
tor coil (behind the condenser coil). Or, the return air filter attaches to the back of the RA grill. Clean the air filters
regularly as per instructions in Owner's Control Manual.
Grills and Transition Boxes - Install the supply air grill as high as possible in a location that will provide
uniform air distribution throughout the cabin; grill louvers should be directed upward. The return air grill should
be installed as low and close to the ale unit as possible to ensure direct, uninterrupted airflow to the evaporator.
The return air grill should have a minimum four inches 4" (101.6mm) of air circulation clearance in front of it, free
from any furniture or other obstructions.
In no instance should a supply air discharge be directed towards a return air grill, as this will cause the system
to short cycle. Allow for adequate clearance behind the supply air grill(s) for the transition box and ducting
connection.
Page No.7

INSTALLATION - DUCTING
THE FOLLOWING IS A SUMMARY OF PROPER DUCTING CONNECTIONS.
ALL DUCTING SHOULD:
[phone] suppor[email protected]
Good airflow is critical for the performance of the entire system. The ducting should be run as straight, smooth
and taut as possible, minimizing the number of 90˚ bends (two 90˚ bends can reduce airflow by 25%).
Pull back the fiberglass insulation exposing the inner Vinyl duct hose.
Slide the Vinyl duct hose around the mount ring until it bottoms out.
Use Hose clamps or zip tie wraps to adjust duct hose into the transition ring. Make Sure duct are properly
secured, so the hose will not slide off.
Wrap duct tape around the ducting and ring joint to prevent any air leaks.
Pull the insulation back up over the Vinyl duct to the ring and tape this joint.
Remove excess ducting and use the same connection method at the supply (discharge) air grill.
Be appropriately sized for each application.
Run as smoothly and taut as possible.
Have as few bends or loops as possible.
Be securely fastened to prevent sagging during boat operation.
Have all excess ducting lengths trimmed off.
Not be flattened or kinked.
Insulated when located in high heat load areas (hull side, mechanical compartments, etc.).
Be properly protected against potential damage when routed through open areas.
Do not route ducting through engine room or any area where it may be exposed to dangerous vapors or
exhaust fumes.
Page No.8
Marine Air Conditioner
Marine Air Conditioner
1.7XUQWKHRXWVLGHGXFWDQGH[SRVHLQQHUGXFWKRVH
2.3OXJWKHLQQHUGXFWLQWRWKHÀDQJH7KHQ¿[LWZLWKDQ
DGKHVLYHWDSHWRSUHYHQWDLUOHDNDJH
3.7XUQEDFNWKHRXWVLGHGXFWDQGIDVWHQZLWKDhose
FODPS
4.$GMXVWWKHDLURXWOHWE\ORRVLQJORFNVFUHZDQGVHFXUHWKHVFUHZWLJKWO\RQFHWKHDLURXWOHWLVDGMXVWHGDWWKH
RSWLPDOORFDWLRQ
Fitting

6HOHFWDSURSHUGXFWVL]HLQDFFRUGDQFHZLWK$&XQLWPRGHO

)ROORZWKHGUDZLQJSURFHGXUHVIRUGXFWLQVWDOODWLRQ

8VHDZHOOLQVXODWHGÀH[LEOHGXFWWRSUHYHQWWKHGHZFRQGHQVDWLRQZDWHUGXULQJFRROLQJPRGH

6HOHFWDSURSHULQOHWJULOOHDQGRXWOHWJULOOH

,QVWDOODLQOHWJULOOHDVORZSODFHVDVSRVVLEOHDQGRXWOHWJULOODVKLJKSODFHVDVSRVVLEOH

㼘㼛㼏㼗㻌㼟㼏㼞㼑㼣

Several guidelines should be followed during the installation of the seawater system. If the circulation pump is
centrifugal and not self-priming, it must be mounted so that it is always at least one foot below the water line
regardless of which tack the vessel is on. Pump may be mounted horizontally or vertically, however the discharge
must always be above the inlet. Pump head should be rotated toward the direction of water flow
Install the seawater scoop intake facing bow and as far below the water line and as close to the keel as possible
in any application, but especially on a sailboat. The seawater scoop must remain in the water under all conditions
or air will get into the pump. Turn air conditioner off in rough seas.
NOTE: The seawater scoop intake must face forward and not be shared with any other pump.
A seawater strainer is mandatory between the shut off valve (seacock) and the pump to protect the pump from
any foreign matter. Failure to install a seawater strainer will void the pump and unit warranty.
The seawater system should be installed with an upward incline from the seawater scoop and seacock, through
the strainer, to the inlet of the pump and then up to the inlet of the A/C unit's condenser coil. The discharge from
the Mabru A/C unit should then run to the seawater outlet thru-hull fitting which should be located where it can be
visually checked for water flow and as close as practicable to the waterline to reduce noise. All hose connections
shall be secured by means of two double/reversed stainless steel hose clamps. Use Marine sealant on all thread-
ed connections.
INSTALLATION - SEAWATER SYSTEM
[phone] suppor[email protected]
Page No.9

Do not terminate condensate drain line within 3' (.91M) of any outlet of engine or generator exhaust systems, nor
in a compartment housing an engine or generator, nor in a bilge, unless the drain is connected properly to a sealed
condensate or shower sump pump. If drain line is not properly installed, then dangerous fumes may travel up drain
line and contaminate living quarters.
Ethernet cable
Touch screen thermostat control
Insulated tape
Stainless steel clamps.
(Mabru 12V Raw water pump included in the
SC DC 12 Volts units Only)
The following is a summary of the seawater system installation:
Install the seawater scoop thru-hull inlet as close to the keel and as far below the water line as possible, facing
forward. Bed the scoop with a marine sealant designed for underwater use.
Install a bronze, full flow seacock on the seawater scoop thru-hull inlet.
Install a seawater strainer below the level of the pump with access to the filter.
Mount the pump above or same level of the strainer and at least one foot below the waterline.
Connect the seacock and strainer with an uphill run of reinforced marine-grade hose.
Connect the discharge from the pump uphill to the bottom inlet of the ale unit's condenser coil with 5/8"
(15.9mm) reinforced marine-grade hose. Connect the discharge from the condenser coil to the overboard
discharge thru-hull fitting with 5/8" (15.9mm) reinforced marine grade hose.
Avoid loops, high spots, or the use of 90° elbows with seawater hose (each 90° elbow is equivalent to 2.5'
(0.762M) of hose and a 90° elbow on the pump outlet is equivalent to 20' (61M) of hose.
Double clamp all hose connections with two stainless steel clamps, reversing the clamps.
Use Marine sealant on all threaded connections.
Connect all metallic parts in contact with seawater to the vessel's bonding system, including the speed scoop
inlet, strainer, pump and the air conditioner, to reduce the possibility of any electrolysis problems.
[phone] suppor[email protected]
Page No.10