Teak Timber Grills

T12X6RA	12" x 6" Teak Return Air Grill
T16X4RA	16" x 4" Teak Return Air Grill
T1OX1ORA	10" x 10" Teak Return Air Grill
T12X12RA	12" x 12" Teak Return Air Grill
T10X6DA	10" x 6" Teak Discharge Air Grill
T12X6DA	12" x 6" Teak Discharge Air Grill
T16X4DA	16" x 4" Teak Discharge Air Grill

Cherry Timber Grills

T12X6RA	12" x 6" Cherry Return Air Grill
T16X4RA	16" x 4" Cherry Return Air Grill
T1OX1ORA	10" x 10" Cherry Return Air Grill
T12X12RA	12" x 12" Cherry Return Air Grill
T1OX6DA	10" x 6" Cherry Discharge Air Grill
T12X6DA	12" x 6" Cherry Discharge Air Grill
T16X4DA	16" x 4" Cherry Discharge Air Grill

Please note:
* All timber grills are painted with a clear semi gloss finish.
* All timber grills can be supplied in custom sizes
* All timber grills can be supplied in different types of timber

e.g. Rock Maple, Beech, Ash, Oak

* Timber discharge air grills are constructed from solid timber with two sets of vertical and horizontal moveable louvers

* Timber return air grills are constructed from solid timber with one set of fixed timber horizontal louvers and filter

Plastic Grills

RBPDG4	4" Round Beige Plastic Discharge Grill w/shut off
RBPDG6	6" Round Beige Plastic Discharge Grill w/shut off
RBLPDG3	3" Round Black Plastic Discharge Grill w/shut off
RWHPDG3	3" Round White Plastic Discharge Grill w/shut off

* Roundplastic 4" & 6" discharge grills are available in beige and designed to shut off for head installation

* Round plastic 3" discharge grills are available in black & white and designed with rotatable blades for helm dash installation

 

Installation Guideline

Flexible Insulated Ducting

FID3	3" Flexible Insulated Ducting per metre
FID4	4" Flexible Insulated Ducting per metre
FID5	5" Flexible Insulated Ducting per metre
FID6	6" Flexible Insulated Ducting per metre
FID7	7" Flexible Insulated Ducting per metre
FID8	8" Flexible Insulated Ducting per metre
FID10	10" Flexible Insulated Ducting per metre

 

 

 

 

 

 

Inadequate air flow is a leading cause of complaints and can significantly shorten the life of the Marvair unit. The air distribution system must be engineered to ensure sufficient air flow throughout the system. This includes proper duct sizing and sufficient open area on the supply and return grills.

Duct work guidelines

• Duct work must be firmly attached, secured and sealed to prevent air leakage.
• Use transition boxes and air divider boxes with duct to split and route the conditioned air as required.
• When using insulated flexible duct, make sure that the inner duct is secured and sealed to an adapter before pulling the insulation over the connection.
• Install the supply air grills high on cabin wall to create good air circulation.
• Stretch the duct tight in straight runs.
• Make the bends and turns as large as possible. Secure the duct so that is remains in its installed position.
• Always use insulated duct to prevent condensation.
• Insulate all transition and air divider boxes.
• If duct is in a storage or other high traffic area, protect it from being crushed by a shield or box.
• If the duct must be run through areas containing engines or fossil fuelled devices, it is absolutely mandatory that the duct system be air tight to prevent carbon monoxide and any other hazardous gases or vapours from being introduced into the air system.

Air Flow Noise

Air moving though duct work and across the blades in the grills and louvers generates sound.

The faster the air, the greater the sound. To keep sound to acceptable levels, the cross sectional area of the duct must be large enough to keep the velocity below 600ft/min (3m/sec). Air flow faster than this is likely to cause noise complaints.

Grill Transition Boxes

GTB10X6	10" x 6" Grill Transition Box Only
GTB12X6	12" x 6" Grill Transition Box Only
GTB16X4	16" x 4" Grill Transition Box Only

Grill Transition Boxes With 1 Hose Adapter

GTBHA10X6	10" x 6" Grill Transition Box w/1 Hose Adapter
GTBHA12X6	12" x 6" Grill Transition Box w/1 Hose Adapter
GTBHA16X4	16" x 4" Grill Transition Box w/1 Hose Adapter

All transition boxes can be supplied fitted with any 1 hose adapter available

Air Divider Boxes

ADB5.5	5 ½" Air Divider Box Only
ADB6.5	6 ½" Air Divider Box Only
ADB7.5	7 ½" Air Divider Box Only

 

Air Divider Boxes With 3 Hose Adapters

ADBHA5.5	5 ½" Air Divider Box w/3 Hose Adapters
ADBHA6.5	6 ½" Air Divider Box w/3 Hose Adapters
ADBHA7.5	7 ½" Air Divider Box w/3 Hose Adapters

 

Hose Adapters

HAR3	3" Hose Adapter Round
HAR4	4" Hose Adapter Round
HAR5	5" Hose Adapter Round
HA05	5" Hose Adapter Oval
HAR6	6" Hose Adapter Round
HA06	6" Hose Adapter Oval
HAR7	7" Hose Adapter Round
HA07	7" Hose Adapter Oval
HAR8	8" Hose Adapter Round
HA08	8" Hose Adapter Oval

P3 Panel Insulated Transition and Air Divider Boxes can be supplied to custom made sizes

Electric Damper

ED6	6" Electric Damper 240V 50Hz
ED8	8" Electric Damper 240V 50Hz

Magnetic Pump

* Non-corrosive polypropylene housing
* Non leak seal-less motor chamber
* Ceramic durable shaft and bearing

240V 50Hz		@2M Head
MDZ40	240V 50/60 Hz Sea Water pump	20 LPM
MDZ55	240V 50/60 Hz Sea Water pump	35LPM
MDZ70	240V 50/60 Hz Sea Water pump	50LPM
NHZ250PS	240V 50/60 Hz Sea Water pump	75LPM
115V 60Hz
MD40	115V 60 Hz Sea Water pump	20 LPM
MD55	115V 60 Hz Sea Water pump	35 LPM
MD70	115V 60 Hz Sea Water pump	50 LPM
NH250PS	115V 60 Hz Sea Water pump	75 LPM

Water Flow Chart

Minimum Water Flow* for Marvair Reverse Cycle systems
Model (BTUH)	Minimum Water Flow at the Unit
5,000	1.4 GPM / 5.3 LPM
7,000	2.0 GPM / 7.6 LPM
10,000	2.9 GPM / 11.0 LPM
12,000	3.5 GPM / 13.3 LPM
16,000	4.7 GPM / 17.8 LPM
18,000	5.25 GPM / 19.9 LPM
24,000	7.0 GPM / 26.5 LPM
* Based upon 85°F (29.5°C) inlet water measured at the inlet of the Marvair unit.

 

 

 

 

 

 

All Purpose Sea Water Hose

SWH12	½"All Purpose Sea Water Hose per metre
SWH16	⅝"All Purpose Sea Water Hose per metre
SWH19	¾"All Purpose Sea Water Hose per metre
SWH25	1"All Purpose Sea Water Hose per metre
SWH32	1¼"All Purpose Sea Water Hose per metre
SWH40	1½"All Purpose Sea Water Hose per metre

Recommended Water Pipe Sizes
Flow Rate (GPM)	Pump Inlet Pipe Size	Pump Discharge Pipe size
1 through 4	⅝"	⅝"
4 through 7	¾"	⅝"
7 through 11	1"	¾"
11 through 15	1"	1"
15 through 20	1¼"	1"
20 through 25	1¼"	1¼"
25 through 30	1½"	1¼"

COOLING WATER FLOW DISTRIBUTION MANIFOLDS

 

 

 

 

 

 

Proper water flow is absolutely critical to the operation of the Marvair reverse cycle air conditioner. If the pipe is too small, back pressure is created causing a drop in water flow, even if the pump is correctly sized. If the piping is too large, the slow velocity of the water may cause silt build-up and barnacle growth inside the piping, eventually restricting water flow.