HSNCS70B - Air Conditioning Rinnai - Free user manual and instructions

Product Type	Split System Air Conditioner (Cooling Only)
Model	HSNCS70B
Indoor Unit Dimensions (W x H x D)	1186 x 258 x 340 mm
Outdoor Unit Dimensions (W x H x D)	940 x 675 x 399 mm
Indoor Unit Weight	17.0 kg
Outdoor Unit Weight	59.0 kg
Power Supply	230 V / 50 Hz / Single Phase
Circuit Breaker Rating	20 A
Refrigerant Type	R32 (Flammable, Class 2.2)
Standard Refrigerant Charge	1420 g
Minimum Floor Area for Installation	1.18 m²
Pipe Connection Size (Gas)	15.88 mm (5/8")
Pipe Connection Size (Liquid)	6.35 mm (1/4")
Maximum Pipe Length	30 m
Maximum Height Difference	20 m
Operating Temperature Range (Cool)	Outdoor: 14°C ~ 52°C; Indoor: >17°C
Operating Temperature Range (Dry)	Outdoor: 5°C ~ 31°C; Indoor: >6°C
Functions	Cool, Dry, Fan, Auto, Sleep, Timer, Follow Me
Remote Control	Included with wall bracket and AAA batteries (x2)
DRED (Demand Response) Interface	Optional (RJ45 and terminal connections)
Filter Cleaning	Removable, washable with mild detergent; turn off power before cleaning
Installation Requirements	Must be installed by an Authorised Person in accordance with AS/NZS 3000, AS/NZS 5141
Safety Features	Earth wire, circuit breaker with magnetic and thermal trip, overload protection

Frequently Asked Questions - HSNCS70B Rinnai

What type of refrigerant does the Rinnai HSNCS70B use?

The HSNCS70B uses R32 refrigerant, which is a flammable gas (Class 2.2). It must be handled by a licensed refrigeration mechanic.

What is the minimum floor area required for installation?

The minimum floor area is 1.18 m² for a standard installation with up to 10m pipe length, based on an installation height of 1.8m.

Can I install the HSNCS70B myself?

No. Installation, maintenance, and removal must only be performed by an Authorised Person in compliance with local regulations and AS/NZS 3000.

What are the dimensions and weight of the indoor and outdoor units?

Indoor unit: 1186 x 258 x 340 mm, 17 kg. Outdoor unit: 940 x 675 x 399 mm, 59 kg.

How do I clean the air filters?

Turn off the main power before cleaning. Open the front panel, remove the filters, and wash them with a soft, damp cloth and mild detergent. Do not use harsh chemicals or solvents.

What is the maximum pipe length and height difference?

The maximum pipe length is 30 m and the maximum height difference between indoor and outdoor units is 20 m. For lengths exceeding 10 m, additional refrigerant must be added (25 g/m).

What should I do if the air conditioner is not cooling properly?

Check that the stop valves are fully open, the air filters are clean, and there are no obstructions at the air inlets/outlets. Ensure the unit is in Cool mode and the set temperature is lower than room temperature.

Does the HSNCS70B have a DRED interface?

Yes, it is supplied with a DRED interface that uses an RJ45 socket or four-wire terminal connections for demand response capability.

What are the operating temperature limits for cooling mode?

For cooling mode, the indoor room temperature must be above 17°C and the outdoor temperature between 14°C and 52°C.

Can the condensate water be used for drinking or watering plants?

No. The condensate water is not potable and may pose a health risk if consumed. Do not drink it or expose animals/plants directly to the discharge air.

USER MANUAL HSNCS70B Rinnai

C Series Cooling Only Models:

HSNCS25B

HSNCS34B

HSNCS50B

HSNCS70B

HSNCS80B

Line drawing of a Rinnai air conditioner unit (no text or symbols on body)

Line drawing of a Rinnai air conditioning unit with fan grille and ventilation slots (no text or symbols on the device itself)

Split System Air Conditioner

Installation Manual

Rinnai

This appliance must be installed in accordance with:

• Manufacturer's Installation Instructions
• Current AS/NZS 3000, AS/NZS 5141
- Local Regulations and Municipal Building Codes including local OH&S requirements

This appliance must be installed, maintained and removed only by an Authorised Person.

For continued safety of this appliance it must be installed and maintained in accordance with the manufacturer's instructions.

TABLE OF CONTENTS

Warnings and Important Information 4

Installation General 7

Contents Checklist 7

Appliance Components 7

Weights & Dimensions 7

Location 8

Indoor Unit 8

Outdoor Unit 8

Pipe Length & Elevation Limits 8

Installation 9

Indoor Unit 9

Wall Mounting Plate 9

Wall Penetration 9

Drain Pipe 9

Electrical Connections 10

Wall Installation 10

Outdoor Unit 11

Electrical Connections 11

DRED Connection (optional) 12

Refrigerant Pipes 13

Flaring 13

Connecting Vapour / Liquid Pipes To Indoor & Outdoor Units 13

Air Purging & Leakage Test 14

Evacuation Vacuum Method / Leak Test 14

Adding Refrigerant for Longer Line Length 14

Final Checklist 15

WARNINGS AND IMPORTANT INFORMATION

READ ALL INSTRUCTIONS BEFORE USING THE APPLIANCE.

Always comply with the following precautions to avoid dangerous situations and to ensure optimum performance.

Failure to carefully read and follow all instructions in this manual can result in equipment malfunction, property damage, personal injury and/or death.

DANGER: Indicates an imminently hazardous situation which, if not avoided, will result in personal injury or death.

WARNINGS: Indicates a potentially hazardous situation which, if not avoided, could result in personal injury or death.

CAUTIONS: Indicates a potentially hazardous situation which, if not avoided, could result in minor or moderate injury or damage to the appliance. It may also be used to alert against unsafe practices.

REGULATORY

This appliance shall be installed in accordance with:

Manufacturer's Installation Instructions.

Current AS/NZS 3000, AS/NZS 5141.

Local Regulations and Municipal Building Codes including local OH&S requirements.

This appliance must be installed, maintained and removed ONLY by an Authorised Person.

For continued safety of this appliance it must be installed and maintained in accordance with the manufacturers instructions.

This appliance uses R32 refrigerant.

This appliance is heavy, use 2 people or mechanical lifting device. Improper lifting may result in serious injury.

Take care when opening or unpacking this appliance. Failure to do so may result in serious injury or product failure.

DO NOT modify the electrical wiring of this appliance. If the control power wiring is damaged or deteriorated then it must be replaced by an authorised person. Failure to do so may result in electric shock, fire, serious injury or product failure.

DO NOT install the air conditioner on an unstable or non level surface or where there may be a danger of it falling. It may result in death, serious injury, or product failure.

DO NOT install the outdoor unit where noise may cause nuisance.

DO NOT install the outdoor unit where it will be exposed to sea wind (salt spray) as this will reduce durability.

MANDATORY INSPECTION PRIOR TO INSTALLATION

Immediately report any damage or discrepancies to the Supplier of the appliance. This appliance was inspected and tested at the time of manufacture and packaging, and released for transportation without known damage. Upon receipt, inspect the exterior for evidence of rough handling in shipment. Ensure that the appliance is labelled correctly for the gas and electrical supply, and/or other services it is intended to be connected to.

For safety and warranty purposes, appliances that may be damaged or incorrect MUST NOT be installed or operated under any circumstances. Installation of damaged or incorrect appliances may contravene local government regulations. Rinnai disclaims any liability or responsibility whatsoever in relation to the installation or operation of damaged or incorrect appliances.

INSTALLATION

This appliance shall be installed in accordance with local electrical safety regulations by an authorised person such as a licensed electrician.

This appliance is a Type 1 Electrical Appliance.

Make sure the live wire, neutral wire and earth wire in the power socket are properly connected. Inadequate or incorrect electrical connections may cause fire or electric shock.

The yellow-green wire in air conditioner is the earthing wire which cannot be used for other purposes. Improper earthing may cause electric shock.

The circuit breaker must have the functions of magnetic tripping and heat tripping to prevent short circuit and overload.

Use a standard circuit breaker and fuse conforming with the rating of the appliances.

Model	HSNCS34B HSNCS50B HSNC$70B HSNCS80B
Circuit Breaker (Amps)	6 16 20 25

The unit must be earthed in accordance with local regulations.

Connect all wiring tightly. Failure to do so may result in electric shock or product failure.

DO NOT supply power to the unit until all wiring and tubing are completed.

Select an installation location where the components can be mounted securely and accessible for service and replacement.

Make sure tubing is properly insulated to ensure optimum performance.

Install the drain hose properly for smooth drainage of condensed water.

Make sure to check for and rectify any refrigerant leaks after you install or repair the unit.

This appliance uses R32 (difluoromethane) refrigerant, which is a flammable gas class 2.2 according to AS/NZS 1677 and must be handled by a refrigeration mechanic with appropriate Australian refrigerant handling licence.

WARNING Risk of fire / flammable material. If the refrigerant is leaked, together with an external ignition source, there is a possibility of ignition.

Read the OPERATING INSTRUCTIONS carefully before operation.

Service personnel are required to carefully read the OPERATING INSTRUCTIONS and INSTALLATION MANUAL before operation.

Further information is available in the OPERATING INSTRUCTIONS, INSTALLATION MANUAL, and the like.

Certain levels of refrigerant require minimum room sizes. Please ensure that these minimum room sizes are adhered to for standard installations (up to 10m pipe length). If larger refrigerant charges than standard are used then please consult AS/NZS 60335.2.40 to determine the safe minimum floor area for the installation.

Make sure that the area has been made safe by having suitable ventilation and is free from ignition sources before charging or releasing the charge of R32.

Model	HSNCS34B HS	NCS50B HSNCS	70B HSNCS80B
Standard Charge (g)	950 1110 1420 1	420
Minimum Floor Area (m^{2}$ )	0.62	0.87	1.18	1.93	1.93

The minimum floor area ( m^2 ) is determined based on the installation height at 1.8m for wall mounted units.

OPERATION

DO NOT let the air conditioner run for extended periods when the humidity is very high or when doors or windows are left open. As this may result in an excessive operational loading and lead to product failure.

DO NOT cover or place articles on any part of this appliance.

DO NOT touch, operate or clean the air conditioner with wet hands. It may result in electric shock or product failure.

DO NOT insert hands or other objects through the air inlet or outlet while the appliance is operating. It may result in electric shock or product failure.

DO NOT place a heater or other heating appliances near this appliance, always ensure sufficient ventilation when using this appliance and a heating appliance at the same time. Failure to do so may result in product misoperation.

Turn main power off before cleaning. Failure to do so may result in fire, electric shock, or product failure.

DO NOT use solvents, abrasives or harsh detergent to clean any part or surface of this appliance or spray water or allow liquids to enter the indoor unit. The enclosure of the appliance and remote control can be cleaned using a soft, damp cloth and a mild detergent.

NEVER touch the metal parts of the air conditioner when you remove the air filter. It may result in electric shock or product failure.

DO NOT leave flammable materials near the appliance. It may result in explosion or fire.

If there is excessive noise, smell or smoke coming from the appliance, turn the appliance off, isolate the power supply and contact a service agent.

DO NOT operate the appliance if it has been submerged into water due to flooding, contact a service agent. Failure to do so may result in electric shock, fire, serious injury, or product failure.

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.

The air conditioning system is designed to achieve consumer comfort. It is NOT designed for commercial applications requiring a controlled atmosphere (i.e. computer rooms, food preservation, etc.)

DO NOT block the inlet or outlet of air flow. It may result product in failure.

DO NOT drink the condensate water drained from the appliance. This condensate is not potable and may present a health risk if consumed.

DO NOT expose people, animals or plants directly to the cold or hot discharge of the appliance. It may result in serious injury.

DO NOT mix the batteries for the remote control with other types of batteries or mix new batteries with used batteries. Failure to do so may result in product failure. STOP using the remote control if there is a battery fluid leak.

OPERATION RANGE LIMITATIONS

The table below indicates the temperature ranges the air conditioner can be operated within.

MODE Cool Mode Dry Mode
Room Temperature > 17°C > 6°C
Outdoor Temperature 14°C ~ 52°C 5°C ~ 31°C

INSTALLATION GENERAL

CONTENTS CHECKLIST

Item and quantity provided(Indoor)
Indoor unit x1 Indoor unit support	bracket x1 Operation manual x1 Outdoor unit x1
Remote controller x1 Drain pipe x1	Installation manual x1 Rubber vibration damper x4
Remote control wall bracket	x1	Brass nut (small)	x2	Energy label	x1
AAA battery	x2	Brass nut (large)	x2

Item and quantity provided(Outdoor)
Tape	x1
Putty	x1

APPLIANCE COMPONENTS

1. Indoor unit air inlet
2. Filter (located behind front access panel)
3. Manual ON/OFF (Auto) override button (located behind front access panel)
4. Indoor unit air outlet (with louvres and vanes for setting air flow direction)
5. Remote control
6. Signal receiver window and temperature display (the display is built into the front access panel)
7. Refrigerant pipes, electrical cable(s) (covered with binding tape)
8. Condensate drain hose (covered with binding tape)
9. Refrigerant entry (for service and installer use only)
10. Outdoor unit air inlet (on rear & left side of unit)
11. Outdoor unit air discharge and protective grille (on front of unit)

WEIGHTS & DIMENSIONS

Model

HSNCS25B

HSNCS34B

HSNCS50B

HSNCS70B

HSNCS80B

Weight(kg)

Indoor

9.0

13.0

17.0

17.0

17.0

Outdoor

27.0

38.0

40.0

59.0

59.0

Dimensions(mm)

Indoor

A910

B206

C294

A1010

B220

C315

A1186

B258

C340

A1186

B258

C340

A1186

B258

C340

Outdoor

D800

E15

F553

D815

E28

F602

D880

E28

F699

D940

E23

F808

D940

E23

F808

G302

H508

I278

G360

H500

I328

G357

H699

I329

G399

H675

I378

G399

H675

I378

LOCATION

INDOOR UNIT

• Ensure the indoor unit is located away from heat or steam.
• Ensure the indoor unit is located so it can be accessed for service and replacement.
• Ensure the indoor unit is located so condensate can be drained away.
• Select a location where the indoor unit can be securely mounted.
• The clearances shown MUST BE maintained.

OUTDOOR UNIT

• Select the location where exposure to direct sunlight and strong wind are minimised.
• Select the location where the outdoor unit can be securely mounted.
• Select the location where the noise and air flow will not cause nuisance.
• Ensure there are no obstructions in the air flow path.
• Ensure the outdoor unit is located so it can be accessed for service and replacement.
• Do not place animals and plants near the air discharge.
• The clearances shown MUST BE maintained.

PIPE LENGTH & ELEVATION LIMITS

Models	Pipe Size Gas Pipe Size Liquid				Chargeless Length	Minimum Length - X	Maximum Length - X	Maximum Height - Y	Additional Refrigerant
	mm inch	mm inch m m	m m g/m
HSNCS25B	09.52 3/8 06.3	35 1/4 10 2 20	12 15
HSNRQ34B	09.52 3/8 06.3	35 1/4 10 2 20	12 15
HSNCS50B	012.70 1/2 06	35 1/4 10 2 30	20 25
HSNCS70B	015.88 5/8 06	35 1/4 10 2 30	20 25
HSNCS80B	015.88 5/8 06	35 1/4 10 2 30	20 25

The outdoor unit is charged for interconnecting pipe lengths of up to 10m. Additional refrigerant is to be added for lengths above 10m.

graph LR
    A["Indoor unit"] -->|Y| B["Outdoor unit"]
    B -->|X| A

graph LR
    A["Indoor unit"] --> B["X"]
    B --> C["Outdoor unit"]
    C --> D["Y"]

INDOOR UNIT

Wall Mounting Plate

1. The wall or structure on which the units are to be mounted must be capable of supporting the weight of the appliance and the associated pipe-work.
2. Fix the mounting plate on to the wall using, ensuring that it is both level and firmly mounted with the appropriate fixings.

DO NOT install the unit in a place where electrical wiring or conduits are located.

Wall Mounting Plate Positioning Dimensions (mm)
HINCS25B HINCS34B HINC						S50B / HINCS70B / HINCS80B
A B	C D E F	A B C	D E F A	B C D E F
294 9	10 225	170 40	150 315	1010 2	35 180	40 120	340 118	6 265 2	05 81 128

Wall Penetration

Drill a ∅70mm wall penetration through the wall with a 2° to 4° fall to the outside wall.

Drain Pipe

1. Connect the drain pipe to the drain hose outlet of the indoor unit,
2. Bind the joint with PVC insulation tape (not supplied).

Diagram showing two stages of a threaded bolt or screw being welded, with no text or symbols present.

Illustration of a mechanical component with threaded end and flange (no text or symbols)

Electrical Connections

Must be installed, maintained and removed by authorised persons in accordance with AS/NZS 3000 and all other relevant local regulations and municipal building codes including OH&S requirements.

Ensure electric wiring is installed properly. Improper installation may cause malfunction, fire, or electric shock.

The unit must be earthed following local electrical codes.

1. Open the front panel.
2. Remove the wiring cover.
3. Insert the electrical cable(s) through the bottom side at the back of indoor unit.
4. Secure the cable onto the control board with the cable clip.
5. Connect the cables as shown on the drawing to the corresponding terminals.
6. Re-install the wiring cover.
7. Close the front panel.

Wall Installation

1. Remove the two foam shipping blocks from the rear of indoor unit as shown.
2. Position the piping as shown on the drawing.
3. Tape the refrigerant pipes, electric cable(s) and drain hose. Ensure the water drain hose is located at the lowest side of the bundle.

* The drain pipe is dual handed and may be installed to either the left or right of the appliance.

1. To use this option unclasp the drain hose.
2. Unscrew the rubber plug from the alternate drainage discharge connection point.
3. Clip the drainage hose into the alternate discharge connection point.

4. Screw the rubber plug into the unused drainage discharge connection point.

5. Hang the mounting slots of the indoor unit on the upper portion of the mounting plate. Ensure that the hooks are properly seated on the plate.

6. Push the unit towards to the wall, and hook the unit onto the lower fixing hook.

Ensure that there is no leakage from the drain pipe connection and that the drain pipe has a continuous fall to the outside.

Ensure that all wall penetrations are sufficiently weatherproofed.

OUTDOOR UNIT

Electrical Connections

Must be installed, maintained and removed by authorised persons in accordance with AS/NZS 3000 and to all other relevant local regulations and municipal building codes including OH&S requirements.

Ensure electric wiring is installed properly. Improper installation may cause malfunction, fire, or electric shock.

The unit must be earthed following local electrical codes.

1. Remove the wiring cover.
2. Secure the electrical cable(s) and power cable onto the control board with the cable clip.
3. Connect the cables as shown on the drawing below.

1. Re-install the wiring cover.

DRED Connection (optional)

This appliance is supplied with an DRED interface, the interface provides one connection method of an RJ45 socket.

Must be installed, maintained and removed by authorised persons in accordance with AS/NZS 3000 and to all other relevant local regulations and municipal building codes including OH&S requirements.

Ensure electric wiring is installed properly. Improper installation may cause malfunction, fire, or electric shock.

1. Remove the wiring cover.
2. Connect the power feed to the terminal block as shown on the drawing below.
3. Connect the communication cable to DRED interface using either the four wire terminal connections or RJ45 socket provided.
4. Re-install the wiring cover.

REFRIGERANT PIPES

Flaring

• The main cause for refrigerant leakage is due to defects with the flaring work.
• The installer must ensure that all piping used complies with both:
  AS/NZS 1571:1995 - Copper - Seamless tubes for air conditioning and refrigeration. AS/NZS 4041:2006 - Pressure piping.
• All pipework and fittings should be thoroughly examined for cleanliness and suitability for the system and refrigerant prior to assembling.
• All unsealed tubing must be thoroughly inspected and, if necessary, cleaned before assembly to remove any copper residue and/or scale particles such as dirt or metal.
• Metal filings must not be left in pipework after cutting as they can cause damage compressor (i.e. shaft seals, bearings, etc.).
• Prior to assembly, refrigeration pipes must be clean and burr free. They must not be crushed or kinked.
• For flare connections, a suitable lubricant must be used between the back of the flare and the nut to avoid tearing the flare when tightening the nut.

Connecting Vapour / Liquid Pipes To Indoor & Outdoor Units

1. Align the centre of the pipes.
2. Sufficiently tighten the flare nut with fingers, then tighten with a spanner and torque wrench.

To prevent heat loss and wet floors due to dripping of condensation, both pipes must be properly insulated.

Pipe Dimensions (∅)		Torque Wrench Setting
Metric Imperial
∅ 6.35 mm ∅ 1/4" 18 Nm
∅ 9.52 mm ∅ 3/8" 42 Nm
∅ 12.7 mm ∅ 1/2" 55 Nm
∅ 15.88 mm ∅ 5/8" 75 Nm

Outdoor UnitIndoor Unit

Ensure the joint nut is tightened firmly to avoid leakage.

Ensure that both the connections and the refrigerant pipes are wrapped with insulation material.

Air Purging & Leakage Test

DO NOT mix any substance other than the specified refrigerant (R32) into refrigerant system.

When refrigerant gas leaks occur, ventilate the room immediately.

R32, as well as other refrigerants, should always be recovered and never be released directly into the environment.

Use a vacuum pump for R32 exclusively. Using the same vacuum pump for different refrigerants may damage the vacuum pump or the unit.

It is necessary to purge air and check for gas leakage after piping work is completed.

If using additional refrigerant, perform air purging from the refrigerant pipes and indoor unit using a vacuum pump, then charge additional refrigerant.

Use a hex socket (3/16") to operate the service valves.

All refrigerant pipe joints to be tightened with a torque wrench at the specified torque.

Evacuation Vacuum Method / Leak Test

1. Remove the caps from the vapour valve, vapour valve service port and the liquid valve.
2. Connect charge hose from the low pressure gauge (manifold gauge set) to the vapour valve service port.
3. Open the low pressure gauge valve (manifold gauge set), turn on the vacuum pump and run for a minimum of 15 minutes.
4. Close low pressure gauge valve (manifold gauge set) and turn off vacuum pump.
5. Wait 2 minutes to allow pressure to stabilise, then check that the low pressure gauge is maintaining a pressure of -100 kPa (-76 cmHg).
6. Disconnect charge hose from the vapour valve service port and replace the vapour valve service port cap.
7. Open both the vapour and the liquid valves to charge the refrigerant system for test running.
8. Test run the system through both heating and cooling cycles and test for leaks.
9. Replace the vapour and liquid valve caps.

Both the vapour and liquid valve caps MUST BE on tight.

1. The system is now ready to run.

Adding Refrigerant for Longer Line Length

Additional refrigerant for longer piping runs can be added either at the time of evacuation of the new installation or whilst the unit is operating, see "Pipe Length & Elevation Limits" on page 8.

It is very easy to overcharge, take caution in charging refrigerant liquid and keep your eye on the scales to avoid overcharging the unit.

Take care not to discharge refrigerant into the atmosphere during installation, re-installation, repair or service.

FINAL CHECKLIST

The checklist is ONLY to be completed by an Authorised Person.

Check Item What can happen if not checked
Is the indoor unit installed securely? Falling, vibration, noise
Has an inspection been made to check for gas leakage? No cooling or heating
Has all thermal insulation been completed (vapour pipes, liquid pipes, indoor portions of the drain hose extension)?
Is the drainage secure? Water leakage
Are the electric wires installed correctly?
Is the wiring in accordance within the specifications? Operation failure, electrical fire
Are all inlets / outlets of the indoor and outdoor units free of any obstructions?
Are the stop valves open? No cooling or heating
Are the pipes designed for use with R32? Pipe or pipe connection leakage
Has a leak test been carried out for the pipe connections? Pipe connection leakage
Has air purging been carried out? No cooling or heating
Has the appliance been tested for correct operation? No cooling or heating
Is the end user fully aware of the operating procedure? Incorrect operation

If you have answered no to any of the above, you must check and correct before appliance hand-over to customer.

Rinnai Australia Pty Ltd

ABN74005138769 | AU24752

100 Atlantic Drive, Keysborough, Victoria 3173

P.O. Box 460, Braeside, Victoria 3195

Tel: [phone]

Fax: [phone]

National Help Line

Tel: [phone]* Fax: [phone]

Monday to Friday, 8.00 am to 5.00 pm EST.

*Cost of a local call higher from mobile or public phones.

For further information visit www.rinnai.com.au or email [e-mail]

Rinnai has a Service and Spare Parts network with personnel who are fully trained and equipped to give the best service on your Rinnai appliance. If your appliance requires service, please call our National Help Line. Rinnai recommends that this appliance be serviced every 3 years.

With our policy of continuous improvement, we reserve the right to change, or discontinue at any time, specifications or designs without notice.