WEISS HT125-3 User manual

Product Code:HT125-3
INSTALLATION INSTRUCTIONS HT125-3
3 ROOM HEAT TRANSFER SYSTEM
For your safety please follow the installation and operating instructions

© COPYRIGHT Weiss Ltd 2020. All rights reserved
Weiss Limited reserves the right to alter designs and specifications
without notice and without obligation
HT125-2
Revision 03.0 210520
GENERAL USE AND SAFETY INFORMATION
Thank you for purchasing this quality Heat Transfer System by Weiss.
With a Weiss Heat Transfer System selected rooms can be warmed by transferring heat from an area with a
slow combustion fire as the main heat source. This product is not designed for use with a heat pump.
NOTE: THESE UPDATED INSTALLATION AND OPERATION INSTRUCTIONS SUPERSEDE ANY INSTRUCTIONS ON THE
CARTON or other FITTING INSTRUCTIONS
PLEASE READ ALL INSTRUCTIONS CAREFULLY BEFORE COMMENCING INSTALLATION.
Note: Pictures and diagrams on packaging are designed only to be used as a concept. All installation
details should be carried out as per the instructions herein.
Note:THIS PRODUCT MUST BE WIRED BY A REGISTERED ELECTRICIAN
SUITABILITY
Heat Transfer System can be installed into any rooms that require warmth to ward off winter chills. The subtle
design and quiet operation make the unit suitable for hallways, bedrooms and other family areas. Not for
use in kitchens and bathrooms.
Heat Transfer System (includes insulated ducting, controller and inline fan) has been designed for ceiling
cavity installation.
BEFORE YOU START
Heat Transfer System must not be mounted in areas subject to direct splashing. Refer to New Zealand
standard NZECP2: 1988 Section 4.6 and Australian Standard AS3000:1991, Section 6.2.
SAFETY NOTE
This appliance is not intended for use by persons (including children) with reduced physical, sensory or
mental capabilities, or lack of experience and knowledge, unless they have been given supervision or
instruction concerning use of the appliance by a person responsible for their safety. Children should be
supervised to ensure that they do not play with the appliance.
To avoid a hazard, a damaged supply cord (if supplied) must be replaced by the manufacturer. This
includes the removal of the supply cord as this appliance is supplied as compliant. Modification including
removal of the plug or cutting of the supply cord will render unit NON-COMPLIANT.
Precautions must be taken to avoid the back-flow of gases into the room from the open flue of gas or other
fuel-burning appliances. Ensure that the fan is switched off from the supply mains before removing the
guard.
Weiss recommends you always operate this product with the supplied controller and do not leave running
overnight. The fan will turn itself off when the temperature dips below the set point in the heat source room.
Before the fan is connected to a power circuit, ensure all electrical and building codes are adhered to.
INSTALLATION INFORMATION
IMPORTANT
Decide on which rooms you want to warm and check the distances between these rooms (in a straight line)
to check your overall ducting requirement.
The Weiss Heat Transfer Systems are not heat generating systems. The systems have been designed to
transfer heat. To ensure that minimal heat is lost while being transferred from one room to another, the
ducting included is fully insulated.
Be sure that you have sufficient surplus heat available to be transferred to additional rooms.
Fit all duct work and secure the fan unit prior to the connection of the electrical supply.
DUCTING
All ducting components that are required to duct your Heat Transfer System are included. A total ducting
length of 15 metres is included with this unit. (5 x 3 metre lengths).
FOR OPTIMUM PERFORMANCE
A well-insulated home with a ceiling height of 2.4 meters will be the most effective for transferring heat using
a Weiss Heat Transfer System. You may have to run your heat source at a higher setting to be able to
transfer the extra heat generated to other rooms. When starting the system, set the controller to the
temperature that is required to be maintained in the room with the main heat source (the room with the

© COPYRIGHT Weiss Ltd 2020. All rights reserved
Weiss Limited reserves the right to alter designs and specifications
without notice and without obligation
HT125-2
Revision 03.0 210520
controller). This means that surplus heat will then be moved through the transfer system to other parts of the
home. In a typical installation, it will take approximately one hour to warm rooms with transferred heat.
1. When mounting the inlet vent make sure it’s far enough from the flue to avoid excess heat on the fascia
and will not ingest too much smoke when the firebox is opened, (Between one and two meters from the
flue.) The fascia mounting body must fit freely in the hole.
2. Finally, attach the ducting to the rear of the fascia body, secure with provided cable tie, repeat step for
outlet vents.
**SEE PLACEMENT OF OUTLETS
3. Slide the outlet vent fascia mounting back into place and screw into place using the four 6x¾ pan head
screws provided. Press the fascia ring onto the body and then screw the centre diffuser into position.
4. In the ceiling cavity suspend the motor from the rafters. There is a directional arrow on the main fan body
showing the flow of air through the inline fan unit. When fitting the ducting, ensure that the arrows on the
motor housing are pointing in the direction of the outlet vent.
DIGITAL CONTROLLER
The enclosed Weiss Heat Transfer System comes complete with a wall-mounted controller. Weiss Heat
Transfer Systems MUST ALWAYS be wired through the included controller. The best placement is in a
convenient location within the room with the heat source, around light switch height, this can vary
depending on room layout –but use this as a guide. The controller needs to be fitted in accordance with
the instructions enclosed with the controller unit. Ensure the controller is located in the same room as the
heat source, approximately 3-4 metres away at wall switch height.
FINAL STEPS
Finally, connect the wiring as illustrated in the included wiring diagram.
Note: Approximate means of disconnection are required to be incorporated in the fixed wiring. This product
must be installed by registered Electrician.
Important mounting information
1. Use no more than 3 metres of ducting from the inlet to the fan motor and 3 metres to the junction.
(This will allow enough supplied cable to connect the controller to the fan)
2. Suspend the motor and keep it at least 150mm above the ceiling or insulation.
3. Keep the ducting as short as possible from the junction to the outlet vents
4. Ensure the ducting to each outlet is the same length to ensure equal airflow to each room.
5. Ensure all ducting is at least 1.5 meters away from the flue in the ceiling cavity
CLEANING AND MAINTENANCE
Isolate the unit from the mains before cleaning. To clean the fascia, simply wash it by hand with a damp
cloth and warm soapy water. Do not use abrasives or solvent cleaners.
The fan unit needs to be wiped clean internally every 2 years to remove dust and residue from the fan
blades and motors and the terminal connections also need to be checked and tightened at this time.
All this maintenance work must be undertaken by a registered Electrician.
LENGTH OF DUCT
Have the Heat Transfer System fan and junction-to-room lengths as short as possible, 1x length (3mtrs) of
ducting must be fitted between the inlet grill and the fan motor. Have the duct stretched out and as
straight as possible. Be sure to cut off any excess. Support duct and bends from the rafters as necessary.
**PLACEMENT OF OUTLETS
Keep the outlet ducting lengths as short as possible - this increases efficiency. It is not necessary, to put
outlet in the centre of the room. The outlet vent needs only to be in the corner of the room.
Note: Initially, the fire or heat source needs to be running at maximum. It takes a while to heat a room and is
dependent on humidity and on the moisture content of the furnishings. We recommend that the door to
the room with the heat source is left ajar to ensure that air can circulate through the room. We also
recommend that the house is aired out occasionally in fine weather. High studs, or badly insulated homes
will remain more difficult to heat than low ceiling –well insulated homes.

© COPYRIGHT Weiss Ltd 2020. All rights reserved
Weiss Limited reserves the right to alter designs and specifications
without notice and without obligation
HT125-2
Revision 03.0 210520
COMPLIANCE AND WARRANTY INFORMATION
•This appliance must be installed by a registered electrician in accordance with the relevant electrical
wiring rules and regulations and a COC is required for a warranty claim.
•Not for use with a heat pump
•Do not cover the fan unit with any insulation material
•Do not completely close off adjustable outlet vents
•Always install this product with the supplied controller
•Weiss Limited reserves the right to alter designs and specifications without notice
•Incorrect wiring or installation is not covered by warranty
•Full Warranty information is available on our web site: https://www.weiss.co.nz/warranty
OPTIONAL ACCESSORIES
This product has been designed to operate most efficiently with a max of up to 12 meters of ducting.
If you require longer ducting, we recommend that you install a Weiss™ extension kit –with joiner and
reducer (Product No HT125-EXT). The maximum effective single length run is 9 metres.
QUESTIONS AND ANSWERS
Q: Will the air from the outlet feel hot?
A: It will depend on the available heat from the heat source. An outlet temperature of about 20ºC to 25ºC
is common, but this will not feel warm to your hand. Average skin temperature of your hand is 28-32ºC.
Q: Do I use the controller supplied.
A: Only use the supplied controller for operation of this system.
Q: My house has a high stud / is badly insulated, will this product still work?
A: Yes, but obviously not as well as in a well-insulated low-stud home. It will always take longer to warm a
larger volume room.
IMPORTANT NOTES
•The unit should be checked annually for correct operation.
•This controller has been designed to work with Weiss Heat Transfer AC Fans only.
Weiss Limited, 20b Arwen Place, East Tamaki
PO Box 204-120 Highbrook Auckland
New Zealand
Web: www.weiss.co.nz