vetus WHT25 Twin Coil Calorifier User Manual

: June 9, 2024
: vetus

vetus WHT25 Twin Coil Calorifier

Product Information: Boilers

The Calorifiers WHT25 – WHT50 – WHT75 – WHT100 are boilers that heat water using one of two heat sources:

Engine coolant flowing through one of the heating coils
Central heating water from the ship’s heating system flowing through the second heating coil

Technical Specifications:

Maximum working pressure: 3 bar
Maximum working temperature: 95°C
Insulation material: polyurethane foam
Outer casing material: stainless steel
Available capacities: WHT25 (25 litres), WHT50 (50 litres), WHT75 (75 litres), WHT100 (100 litres)

Installation:

Installation of the Calorifiers should only be performed by a qualified technician. The installation process involves:

General installation instructions
Pipes from engine to boiler
Installing the fittings
Pressure valve/non-return valve
Pipes for tap water
Heating element

Usage:

The Calorifiers are designed to heat water using engine or central heating water. Follow these instructions for usage:

Ensure that the Calorifier is properly installed and connected to the appropriate heat source.
To heat water using engine heat, ensure that the engine is running and the coolant is flowing through the heating coil.
To heat water using central heating water, ensure that the ship’s heating system is operational and the heating water is flowing through the second heating coil.
Monitor the temperature and pressure of the water in the Calorifier to ensure it does not exceed the maximum working temperature and pressure.
When not in use, drain the Calorifier to prevent damage from freezing.

Refer to the user manual for detailed instructions on winter preparation and draining the Calorifier. Contact a qualified technician for any issues or concerns with the installation or usage of the Calorifiers.

Introduction

The tap water in the boiler’s tank will be heated by one of the following heat sources:

Engine coolant flowing through one of the heating coils.
CH water from the ship’s heating system flowing through the second heating coil,
The built-in electrical heating element.

Use

Proceed as follows before using the calorifier for the first time.

Clean the inside of both the tank and heating coils by rinsing them with clean tap water.
Open the stop cock in the water pipe between pump and tank. Open the hot water tap to release air from the tank and it fills with water.
Fill the heating coils from the engine’s cooling system and the ship’s heating system respectively.
Check all connections, pipes and fittings for leaks.

CAUTION
In the event of a leak, stop the engine immediately or switch off the ship’s heating system and repair the leak before restarting the engine or switching on the heating system.

Stop the engine and check the coolant level. Top up if necessary.
Check the liquid level of the heating system and top up if necessary.
The calorifier is now ready for use.

Heating with engine heat

The engine has to run for a certain time before the tap water heats up. The time required depends on the size of the calorifier and the size of the engine.

WARNING!
The hot tap water can be very hot, temperatures up to 80˚C (176˚F) are possible!
For safe use, always mix with cold water.

Heating while the engine is idle

When the engine is idle, the water can be brought to and maintained at the desired temperature through the ship’s heating system or the electrical heating element. Heating tap water in the boiler tank in this manner usually takes considerably more time than by using the heat of the engine.

INFORMATION
The amount of heat created by an internal combustion engine, and thus available for heating the calorifier, is about the same as the engine power output. So an engine which delivers 50 kW at the shaft will also provide about 50 kW of heat! Generally speaking, a ship’s heating system has a substantially smaller heat capacity and an electrical heating element is only 1.5 kW or less.

WARNING!
Never switch on the electric heating element if the calorifier tank is not completely filled with tap water.

Preparation for Winter

The entire drinking water system, including the boiler’s tap water tank, must be completely drained. See “11 Draining the Boiler” on p. 26. Never fill the drinking water system with anti-freeze as an alternative. This is very toxic.

To drain the boiler, remove the hoses from connections C and D. Open the tap water taps so that the tap water pipes drain completely.
Remove the screw from the pressure valve/non-return valve and open the purge valve. The boiler’s tap water tank can now drain completely.
Once the tap water tank has been drained, close the purge valve and re-fit the screw.

The heating spiral does not require draining.

Product Installation

General
First consult the piping diagrams and installation drawing, see drawing on pages 18 through 21. Preferably fit the boiler low in the ship so that highest point of the boiler is at a lower level than the expansion tank of the ship’s engine. This is in connection with removing air from the system, see drawing

The engine can be connected to the heating coil via connections ‘A1’ and ‘B1’ or connections ‘A2’ and ‘B2’. The heating coils are identical. The flow direction of the engine coolant through the coils has no impact on their correct operation. If the boiler does have to be positioned above the level of the expansion tank for the engine an additional expansion tank must be fitted, see drawing 2. Fit a shut-off valve between the expansion tank and the highest placed pipe between the engine and the boiler. This shut-off valve is closed during normal operation and only opened when topping up or bleeding the system. If the calorifier is installed considerably lower than then the engine’s expansion tank, the coolant water can start to circulate when the engine has stopped. This will lead to very fast cooling of the hot tap water. To prevent this, install a non-return valve – see drawing 3. A stop cock can also be used instead of a non-return valve. The resistance in the pipe can become too high if the pipes between the engine and the boiler are extremely long. The cooling fluid will then no longer circulate through the boiler. In that case fit a central heating circulation pump in the pipe, see drawing 4.

Pipes from Engine to Calorifier (see pages 18 and 19)
The coolant water pipes from the ship’s engine to the calorifier should be as short as possible, so that the increase in engine cool-ant capacity is kept to a minimum and no extra expansion space is required. These pipes must be installed so that they are absolutely self-bleeding. The pipes should have the same cross-section as the calorifier/heater connections on the ship’s engine, so that no extra resistance is created. Also consult the engine supplier’s instructions. Use a good quality reinforced hose or copper pipes.

CAUTION
Always connect metal pipes with short lengths of hose to the engine and the calorifier. The hose will accommodate vibration and prevent the pipes splitting.
The reinforced hose should be resistant to a temperature of at least 100˚C (212˚F), and a pressure of 4 bar (4 kgf/cm2, 58 psi). You can use the same hose as for the tap water – VETUS Article Code: HWHOSE16. Fit each hose connection with a stainless steel hose clamp. In order to reduce heat loss with the engine off, it is recommended that the pipes and fittings are insulated.

Installing the Fittings (see page 23)
On the tap water side of the calorifier, use only corrosion-resistant fittings (stainless steel or brass).

WARNING!
Never use fittings made of steel or iron!
Fit a non-return valve (3) on the tap water intake and an excess pressure valve (15) on the tap water outlet.

Pressure valve/non-return valve
The pressure valve and the non-return valve have been combined in a single fitting. Mount this pressure valve/non-return valve (15) on the tap water intake. The pressure valve has been set to 6 bar (6 kgf/cm2. As the water heats up, the pressure valve will operate, water droplets and a little water loss is normal. If you do not want water running about freely, then connect the outlet connection to a pressure-free drain pipe. When assembling all accessories and fittings, use a good quality, removable screw-thread sealant. Disassembly may be necessary for maintenance, draining and preparation for winter!

Pipes for Tap Water (see page 20)
Use a good quality reinforced hose, stainless steel or copper pipes for the tap water pipes. Always connect pipes to the calorifier with short lengths of hose. These lengths of hose will accommodate vibration and prevent the pipes splitting. The reinforced hose must be of foodstuffs quality and resistant to at least 100˚C (212˚F) and a pressure of 8 bar (8 kgf/cm2, 116 psi). Insulate the pipes and fittings to prevent unnecessary heat loss. VETUS supplies a hose which is suitable for tap water. This hose has an internal diameter of 16 mm., is tasteless, non-toxic, resistant to temperatures up to 160˚C (320˚F), with a working pressure of 8 bar (8 kgf/cm2, 116 psi). Article Code: HWHOSE16.

Heating Element
There is an electrical heating element, power 1500 Watt / 230 V, fitted in the calorifier. The heating element is controlled by a thermostat. Remove the connecting lid L and lead the cable from E to the heating element, see drawing on page 17. Connect the heating element as shown in the wiring diagram. Connect the earth terminals, both from the boiler and the heating element, to the earthing point on the boat!
A different heating element can be fitted as an alternative. The following electrical heating element (with adjustable thermostat) is available:

Art. code Power / Voltage
WHEL220 1000 W / 230 V
WHEL22500 500 W / 230 V
WHEL110 1000 W / 120 V

All heating elements are fitted with external screw thread G 1 1/4.Use a right-angled open-ended spanner or an open ring spanner, size 55 when assembling and disassembling the heating element. Clean the screw thread if necessary and fit the heating element us-ing hemp and liquid packaging to seal the screw thread connection.

Technical Data

Type:	WHT25	WHT50	WHT75	WHT100

Tap Water Tank

Capacity, litre	25 l	50 l	75 l	100 l
Imp. gallon	5.5	11	16.5	22
US gallon	6.6	13.2	19.8	20.4
Connections	G 1/2, male thread
Max. Pressure	6 bar (6 kg/cm2, 87 psi)
Material	Duplex stainless steel, thickness 1 mm (1/32”)
Insulation	Polyurethane, 50 mm (1 31/32”) thick with white painted steel

cover, thickness 0,5 mm (1/32”)
Heat Loss| About 12˚C (54˚F) per 24 hours

Heating spirals (engine cooling water/CH water)

Capacity, litre	0,5 l (1/64”)
Connections	G 1/2, male thread
Max. Pressure	6 bar (6 kgf/cm2 , 87 psi)
Material	Stainless steel AISI 316L

Electric Heating Element

Max. power	1500 Watt
Connection	G 1 1/4, female thread

Pressure Valve

Setting	6 bar (6 kgf/cm2, 87 psi)

Gewicht

Empty	11 kg	17 kg	23 kg	28 kg
24,3 lbs	37,5 lbs	50,7 lbs	61,7 lbs

Piping diagrams

vetus WHT25 Twin Coil Calorifier 01

Mounting

vetus WHT25 Twin Coil Calorifier 10

Principal dimensions

vetus WHT25 Twin Coil Calorifier 15

| WHT025| WHT050| WH075| WHT100|
---|---|---|---|---|---
L| 452| 620| 852| 1052| mm
17 13/16| 24 7/16| 33 9/16| 41 7/16| inch
P| 122| 290| 522| 722| mm
4 13/16| 11 7/16| 20 9/16| 28 7/16| inch