SPACE-RAY SWH110-LT Warm Air Heater Instruction Manual
- May 15, 2024
- SPACE-RAY
Table of Contents
SWH110-LT Warm Air Heater
INSTALLATION
MANUAL
LPHW Warm Air Heater
Model SWH-LT (MK2)
The meaning of the symbol on the material, its accessory or packaging
indicates that this product shall not be treated as regular waste. Please,
dispose of this equipment at your applicable collection point for the
recycling of electrical and electronic equipments waste.
In the European Union and Other European countries which there are separate
collection systems for used electrical and electronic product. By ensuring the
correct disposal of this product, you will help prevent potentially hazardous
to the environment and to human health, which could otherwise be caused by
unsuitable waste handling of this product. The recycling of materials will
help conserve natural resources. Please do not therefore dispose of your old
electrical and electronic equipment with your regular waste.
General
This user’s guide is meant for the installer and if necessary for the user.
It’s a reference to operation and installation of the SWH-LT heater.
1.1. Description
The SWH-LT is an effective in-direct fired heater. The heat exchanger consist
of copper tubes and aluminium fins.
This is an approved design for an optimal heat exchange.
The grille has been designed to accomplish an optimal air displacement at the
lowest possible sound level.
With a 5-stage switch is it possible to reduce the air output and noise level.
1.2. Function
The SWH-LT is essentially a radiator with a fan on the back.
When hot water is pumped through the radiator, and the supply air fan is on,
the heater will blow hot air.
The heater will give no heat when the supply air fan is off, irrespective if
there is hot water running through the radiator.
The heater requires a control (thermostat) to operate the supply of hot water
and to switch the supply air fan on/off.
There are several options for control, this will be described later in this
manual.
For a good air distribution it’s always better to choose 2 or more heaters
instead of a single heater. For example, it’s better to select two 30kW
heaters, instead of one 60kW heater.
1.3. Matching capacity of hot water boiler and SWH-LT
In case the capacity of the boiler is higher than that of the SWH-LT, the
boiler won’t be able to release all the heat produced.
This will cause the boiler to go on and off. As a consequence of this the
installation won’t be able to reach the temperature demanded.
For small installations it is advisable to select a SWH-LT which has an higher
output than the boiler itself.
1.4 Guarantee
Operation and /or installation of appliances not in accordance with this
manual will invalidate guarantee.
2 Technical
2.1 Technical data
The SWH-LT has 4 versions that, in addition to heating via a central heating
boiler, are specially intended for heating use in a low-temperature
installation. In addition, this SWH-LT version can also be used used for
cooling via a heat pump orcooling pump.
See table2, for dimensions
SPECIFICATION GUIDE – SWH-LT Series
Model| SWH110-LT| SWH220-LT| SWH330-LT| SWH340-LT
Maximum heat output @ 45/35OC kW| 8.3| 19.4| 28.6| 37.9
Maximum cooling output @ 7/12OC kW| 6.6| 16.5| 19.2| 32.1
Maximum cooling output @ 15/18OC kW| 3.8| 8.8| 12.8| 17.8
Maximum cooling output @ 16/19OC kW| 3.4| 7.9| 11.7| 16.1
Air volume| m 3/h| 1850| 4150| 5450| 8850
Throw| Horizontal m| 14| 21| 20| 25
Vertical m| 5| 7| 7| 8
Electrical supply V|
230V 1 Phase N & E – 50Hz
Rated power W| 118|
515| 320| 718
Electrical current A| 1.1|
2.3| 1.5| 3.2
Sound level @ 5m dB(A)| 35-54|
35-64| 35-60| 35-62
Weight (incl water) kg| 23|
34| 66| 68
Water connection| ¾”| 1”
Water coil pressure drop kPa| 4| 11| 30|
30
Minimum suspension height m| 2.5
2.2 Dimensions
2.3. Operating Parameters
Working pressure: Max. 5 bar
Water temp: Max. 100⁰C; Min. 4⁰C (risk of freezing)
Ambient temp: Max. 40⁰C; Min. 4⁰C (risk of freezing)
Protection grade: IP00B
Note: Frost can cause the internal copper tubes in the coil to burst and
subsequently to leak.. This is not covered by warranty.
NOTE
2.4. Pre-check
Before installing the heater, please check the heater supplied is the same as
ordered, and ensure it suits the application, supplies available (electrical,
water etc.) along with any local or national regulations.
After installation ensure that the appliance is safe and is not a hazard for
personnel and cannot cause, or be, damage(d) by the contents within the space
i.e moisture, dust, inflammable or corrosive gases, smoke and/or combustible
materials.
The competent installer must make sure that the heater functions correctly and
must instruct the user about safe operation of the heater.
Installation
The SWH-EC is provided with 10 No M10 suspension points on the side panels.
It is recommended that the specially designed cantile- ver brackets or the
ceiling mounting-set are used when mounting the heater.
Ensure that the heater is placed in a stable position, and that there is no
tension on the water side connections.
Condensate drain: If the WWH-LT is used for cooling, ensure the condensate
drain is at the bottom and the unit is placed upright, so that the condense
can drain from the collection tray.
Ensure the condensate can drain freely from thecollection tray, if necessary
use a condensate pump.
Wall installation: The pipe connections for water should always be horizontal,
to enable a drain/venting point to be fitted. The heater can be tilted forward
slightly, but the heater may NOT hang askew. Place the heater in such a manner
that the return connection (cold water) is at the lowest point. It is
important to place the drain/venting point in the pipework near the heater.
Ceiling installation: Again the pipe connections to the heater should be
horizontal, to enable drain/venting of the internal tubes.
To avoid draughts place the heater high enough (minimum 2.5m). If necessary
use our 4-way downflow plenum, use of a plenum will reduce the throw by a
factor of 4. See Fig.
The discharge grille, 4-sided discharge plenum and the vertical louvres are easy to adjust to the desired airflow direction.
Make sure that the exchanger is not damaged and that the heater discharge is
not blocked, and the supply air fan has no restrictions. Make sure that
there’s sufficient circulation of air within the space without the airstream
being considered a draught.
Heaters fixed to the wall should always blow in the direction of the cooler
areas.
3.2 Water connections
Connections for hot water supply and return (2 x ¾” or 2 x 1”) are marked with
a red and a blue sticker. Red is water supply and blue is water return. Do not
swap these connections,as this will affect the heat output.
The SWH-LT is not provided with a vent/drain . This should be fitted as part
of the pipework installation and should be as close to the heater connections
as possible.
Do not over tighten the pipework on the heater connections, this will result
in leaks!
Warning: To prevent damage to the heater, hold the WARNING! water
connections with a wrench to avoid twisting the welded parts of the
connections.
Electrical connection
4.1 230Vac supply
The installation must comply with all applicable local and/or national
standards.
There should be a suitable mains electrical isolator with a main fuse.
There is an electrical diagram further on in this guide.
The supply is 230Vac (50 Hz) with earth.
Isolation switch or power plug
The heater must be equipped with a 230V isolation switch or power plug. This
switch should disconnect liveand neutral (not earth) and have a minimum 3mm
contact opening. Switches or power plugs must be accessible at all times.
4.2 General functioning of the unit
The SWH-LT is simply described as a radiator with a fan at the rear. If there
is hot water flowing through the radiator, and the heater is on, the heater
will blow warm air. But when hot water is flowing through the radiator and the
heater is off, the heater will not discharge warm air.
If the fan is turned on, but the water supply is cold, then ambient air will
leave the heater, possibly causing draughts. This should be prevented.
The installation should have some form of control to make turning on/off the
hot water boiler and the fan of the SWH-LT separately, possible. The SWH-LT
and the boiler are 2 separate systems. Both systems need to be controlled.
There are several ways to do this. This is dependant upon the application and
needs of the user.
4.3 Connecting options
4.3.1 Variants
The SWH-LT has two motor connection versions.
4.3.2 Combinations with a stepless controller.
An optional stepless controller can be used to reduce the noise level of the
appliance. This controls the fan speed of the SWH-LT, remember, lower fan
speed equals lower heat output of the unit.
There are three options for the speed setting:
- Only maximum speed (factory setting)
- With a speed controller
- External via 0-10V
Maximum speed only (factory setting):
This can be done with a wire link on the motor between [10V] and [E1] or
between [T2] and [S3] on the 6-pole connector. As a result, the fan will
always run at maxi- mum speed. This is already fitted as standard.
With a speed controller (potentiometer)
Connect to terminals [10V] [GND] and [E1] in the motor or to GND[T1], 10V[T2] and 0-10V IN[S3] on the 6-pole connector a 3-wire speed controller GA3955, or another potentiometer can be connected.
Note The potentiometer has a resistance value of 10kΩ.
lithe fan is turned on, but the water supply is cold, then ambient air will
leave the heater, possibly causing draughts. This should be prevented.
The installation should have some form of control to make turning on/off the
hot water boiler and the fan of the SWH-LT separately, possible. The SWH-LT
and the boiler are 2 separate systems. Both systems need to be controlled.
There are several ways to do this. This is dependant upon the application and
needs of the user.
Externally controlled with 0-10V
Between terminals [GND] and [E1] in the motor, or GND[T1] and 0-10V IN[S3]
on the 6-pin connector, an external voltage can be set between 0 and 10V to
con- trol fan speed.
Multiple SWH-LT’s on one controller (max of 8 units)
The supply voltage of 10V[T2] may only be used from one SWH-LT, no other’s
should not be connected.
4.3.3 Connection with room thermostat only This option is only possible when
there is a continuous hot water supply. The hot water boiler should have its
own control.
Operation:
The on/off room thermostat will operate the fan of the SWH-LT when there is a
demand for heat. The fan will blow air over the heat exchanger, if the water
is hot the heater will discharge warm air. If the water is cold the heater
will blow ambient air, this can be experienced as a draught.
The boiler must be switched on/off separately. Therefore a second room
thermostat is required.
4.3.4 Connecting with contact thermostat.
This control can be used if the thermostat of the boiler is in the same room
as the SWH-LT.
Operation:
The contact thermostat will close if the water has reached the pre-set
temperature. In this scenario the SWH-LT will only discharge warm air. The
boiler thermo- stat will switch on the boiler. The boiler will pump hot water
around the system with the contact thermostat of the SWH-LT closing if the
water is hot enough. The fan will blow warm air into the space.
If the boiler is shut off by the boiler thermostat, the water will cool down
and the contact thermostat will open (disconnect) causing the SWH-LT fan to
stop.
4.3.5 Connection with room thermostat combined with contact thermostat
This option is applicable when the boiler is controlled by its own thermostat
and there is a continuous hot water supply.
Operation:
The on/off thermostat will operate when there is a demand for heat. The
contact thermostat will not close until the water has reached a pre-set
temperature. In this scenario, the fan of the SWH-LT will blow warm air and
will prevent draughts.
The boiler must be turned on and off separately.
Maintenance and operation
Caution: Make sure that you have turned off the power supply to the
heater you are working on.
The heater must be earthed.
5.1 Maintenance
Especially in dusty spaces, it is important to clean the heater regularly. If
the heat exchanger is heavily covered by dust, it will not displace the heat
sufficiently. Use a vacuum cleaner or compressed air taking care to avoid-
void damaging the heat exchanger fins.
Clean also the fan, guard and air outlet grille.
5.2 Safe operation
The heater is controlled by the room thermostat and/or the 5 speed switch if
there is one present. There are no controls on the heater itself.
Depending on the installation, the user can make following settings:
- Control main or isolation switch
- Turn up and down room thermostat
- Turn up and down contact thermostat
- Change fan speed with 5-stage switch
Adjusting direction of the air outlets is not normally a user action, this is done by the installer.
5.3 Frost damage
ATTENTION: Frost damage!
ATTENTION! Do not set the room thermostat lower than 5°C.
Freezing of the exchanger or the tubes, will cause irreparable damage to the
heater. A constant supply of hot water from the boiler must be ensured. Frost
damage will void warranty claims!
Water temperatures/air volumes
The technical data table (table 1) shows heater capacities (KW) with supplied
hot water temperature of 90/70°C.
In applications where the water flow and return temper- atures are not
90/70°C, the heat output from the SWH-LT will be reduced.
To calculate the heat output at different water temperatures, please refer to
table 3. Select the water temperature along with the air temperature at the
fan inlet.
Where these intersect on the table, this figure is multiplied by the given
heat output in table 2, the resultant figure is the new heat output of the
appliance at the new flow and return water temperatures.
The SWH-ELT is not suitable for steam applications.
Water Temperature
|
Air Temperature
---|---
0 OC| 5 OC| 10 OC| 15 OC| 18 OC| 20 OC
45/35OC| 1.76| 1.51| 1.25| 1.00| 0.81| 0.74
50/30OC| 1.56| 1.30| 1.07| 0.78| 0.64| 0.52
60/40OC| 2.11| 1.85| 1.56| 1.30| 1.16| 1.07
70/50OC| 2.66| 2.37| 2.11| 1.85| 1.62| 1.59
6.2 Example
What is the capacity of a SWH220-LT at a water temperature of 60/40OC degrees
in a room with an ambient temperature of 10OC?
SPECIFICATION GUIDE – SWH-LT Series
Model
| SWH110-LT| SWH220-LT| SWH330-LT|
SWH340-LT
Maximum heat output @ 45/35OC kW| 8.3| 19.4| 28.6| 37.9
Maximum cooling output @ 7/12OC kW| 6.6| 16.5| 19.2| 32.1
Maximum cooling output @ 15/18OC kW| 3.8| 8.8| 12.8| 17.8
Maximum cooling output @ 16/19OC kW| 3.4| 7.9| 11.7| 16.1
Air volume| m 3/h| 1850| 4150| 5450| 8850
Throw| Horizontal m| 14| 21| 20| 25
Vertical m| 5| 7| 7| 8
Electrical supply V|
230V 1 Phase N & E – 50Hz
Rated power W| 118|
515| 320| 718
Electrical current A| 1.1|
2.3| 1.5| 3.2
Sound level @ 5m dB(A)| 35-54|
35-64| 35-60| 35-62
Weight (incl water) kg| 23|
34| 66| 68
Water connection| ¾”| 1”
Water coil pressure drop kPa| 4| 11| 30|
30
Minimum suspension height m| 2.5
Table 1 in section 2, shows the capacity of the SWH220-LT at 45/30OC and 15OC
ambient room temperature.
This is 19.4 kW.
| Water Temperature | Air Temperature |
|---|---|
| 0 OC | 5 OC |
| 45/35OC | 1.76 |
| 50/30OC | 1.56 |
| 60/40OC | 2.11 |
| 70/50OC | 2.66 |
With a water temperature of 60/40OC and 10OC ambient room temperature, the
conversion factor is 1.56, according to table 3 above.
So the heat output output will be 1.56 x 19.4kW = 30.3kW
Tel: +44(0)1473 830 551
Fax: +44(0)1473 832055
www.spaceray.co.uk
info@spaceray.co.uk Gas Fired Products (UK) Ltd
Chapel Lane
Claydon
Ipswich
Suffolk, IP6 0JL
References
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