Rinnai Demand Duo User manual

INFINITYHD200

Demand Duo

Continuous ow with storage backup

Installation guide

Customised hot water systems with 2-5

Rinnai INFINITY HD or EF commercial

continuous ow gas hot water heaters.

This system shall be installed in accordance with:

- Manufacturer’s installation instructions

- AS/NZS 5601 Gas Installations

- Current AS/NZS 3000, G12, AS/NZS 3500.4

- Local regulations and municipal building codes

Installation, servicing and repair shall be carried out only

by authorised personnel.

Warning

Improper installation, adjustment, alteration, service or

maintenance can cause property damage, personal injury

or loss of life.

For more information about buying, using,

and servicing of Rinnai appliances call: 0800

RINNAI (0800 746 624).

Rinnai New Zealand Limited

105 Pavilion Drive, Mangere, Auckland

PO Box 53177, Auckland Airport, Auckland 2150

Phone: (09) 257 3800

Email: [email protected].nz

Web: www.rinnai.co.nz

www.youtube.com/rinnainz

www.facebook.com/rinnainz

Important:

cnt:

Before you start............................................... 4

Models covered............................................... 5

Speciﬁcation summary.................................... 6

Dimensions...................................................... 7

General layout of system................................. 8

Connections.................................................... 9

Individual ﬂueing of internal units................... 10

Systems with EF models - condensate drain ... 11

About the AlphaStat-Plus thermostat ............. 12

AlphaStat-Plus display panel............................ 13

Filling and draining.......................................... 14

Commissioning ............................................... 15

Troubleshooting.............................................. 15

4 | Demand Duo CFHW with storage backup installation guide: 12583-B

Before you start

Unpack the system and components and check for damage. DO NOT install any

damaged items. Check all components have been supplied and that you have the

correct gas type.

Read these instructions to get an overview of the steps required before starting the

installation. Failure to follow these instructions could cause a malfunction of the

system. This could result in serious injury and/or property damage.

Models covered

Code/model Description

RCWDD400E315N/L 2 x HD200 external units with a 315 litre Demand Duo cylinder

RCWDD600E315N/L 3 x HD200 external units with a 315 litre Demand Duo cylinder

RCWDD800E315N/L 4 x HD200 external units with a 315 litre Demand Duo cylinder

RCWDD1000E315N/L 5 x HD200 external units with a 315 litre Demand Duo cylinder

RCWDD400FF315N/L 2 x HDi200 internal units with a 315 litre Demand Duo cylinder

RCWDD600FF315N/L 3 x HDi200 internal units with a 315 litre Demand Duo cylinder

RCWDD800FF315N/L 4 x HDi200 internal units with a 315 litre Demand Duo cylinder

RCWDD1000FF315N/L 5 x HDi200 internal units with a 315 litre Demand Duo cylinder

Customised systems

DD 420 external 2 x EF250 external units with a 315 litre Demand Duo cylinder

DD 630 external 3 x EF250 external units with a 315 litre Demand Duo cylinder

DD 840 external 4 x EF250 external units with a 315 litre Demand Duo cylinder

DD 500 external 2 x HD250 external units with a 315 litre Demand Duo cylinder

DD 750 external 3 x HD250 external units with a 315 litre Demand Duo cylinder

DD 420 internal 2 x EFi250 internal units with a 315 litre Demand Duo cylinder

DD 620 internal 3 x EFi250 internal units with a 315 litre Demand Duo cylinder

DD 840 internal 4 x EFi250 internal units with a 315 litre Demand Duo cylinder

N: Natural Gas

L: LPG

FF: Forced ﬂue (internal units)

Demand Duo Demand Duo CFHW with storage backup installation guide: 12583-B | 5

Location

System should be installed in accordance with G12 and AS/NZS 3500.4. For servicing

and maintenance, please allow suﬃcient room for access of all components of the

system.

Ensure the hot water system is installed in a corrosive free environment and free from chemicals

as this could potentially create an atmosphere that attacks the Rinnai INFINITY water heaters.

Base requirements

System should be installed on a ﬂat level surface of suﬃcient strength to support the weight of

the Demand Duo system when full of water.

The frame must be secured to the ﬂoor using anchor bolts (not supplied).

Access to system

All components of the system must be installed to ensure access can be gained without hazard

or undue diﬃculty for inspection, repair, renewal, or operational purposes. Suﬃcient clearances

shall allow access to removal of all serviceable components.

Where a system is not accessible for maintenance, servicing, or replacement, the Rinnai

warranty will not cover any additional costs caused by access diﬃculty. The system must be

accessible without the use of a ladder or scaﬀold.

Catch pan

It is important a suitably drained catch pan (or drain system) is ﬁtted where damage could be

caused by discharge from the cylinder. This is a mandatory requirement of the installation. If

damage is caused by a leaking cylinder that has not been installed with a suitable drain system

the owner can seek compensation through the installer or consider claiming on insurance.

Rinnai INFINITY ﬂue clearances

Flue clearances must comply with AS/NZS 5601.1.

Demand Duo systems with HDi200 and EFi250 internal units, where each unit is ﬂued

individually, must use a Rinnai approved ﬂue system.

6 | Demand Duo CFHW with storage backup installation guide: 12583-B

Specication summary

RINNAI DEMAND DUO SYSTEMS Auckland and Northland BOP, Gisborne, &

Hawkes Bay

Wellington, Waikato,

Taranaki, Manawatu, &

South Island

Model INFINITY Input

(MJ/h)

Output

(kW)

Approx.

weight

when full

1st hr

delivery

(L/hr) @

50 ° rise

2nd hr

delivery

(L/hr) @

50 ° rise

1st hr

delivery

(L/hr) @

55 ° rise

2nd hr

delivery

(L/hr) @

55 ° rise

1st hr

delivery

(L/hr) @

60 ° rise

2nd hr

delivery

(L/hr) @

60 ° rise

DD 400 ext 2 x HD200 ext 398 94 510 kg 1812 1560 1670 1418 1552 1300

DD 600 ext 3 x HD200 ext 597 141 540 kg 2592 2340 2379 2127 2202 1950

DD 800 ext 4 x HD200 ext 796 188 590 kg 3372 3120 3088 2836 2852 2600

DD 1000 ext 5 x HD200 ext 995 235 620 kg 4152 3900 3797 3545 3502 3250

DD 420 ext 2 x EF250 ext 422 111.2 545 kg 2172 1920 1998 1746 1852 1600

DD 630 ext 3 x EF250 ext 633 166.8 590 kg 3132 2880 2871 2619 2652 2400

DD 840 ext 4 x EF250 ext 844 222.4 665 kg 4092 3840 3744 3492 3452 3200

DD 500 ext 2 x HD250 ext 500 119.8 530 kg 2172 1920 1998 1746 1852 1600

DD 750 ext 3 x HD250 ext 750 179.7 570 kg 3132 2880 2871 2619 2652 2400

DD 400 int 2 x HDi200 int 390 90.2 510 kg 1812 1560 1670 1418 1552 1300

DD 600 int 3 x HDi200 int 858 135.3 545 kg 2592 2340 2379 2127 2202 1950

DD 800 int 4 x HDi200 int 780 180.4 595 kg 3372 3120 3088 2836 2852 2600

DD 1000 int 5 x HDi200 int 975 225.5 630 kg 4152 3900 3797 3545 3502 3250

DD 420 int 2 x EFi250 int 422 111.2 545 kg 2172 1920 1998 1746 1852 1600

DD 620 int 3 x EFi250 int 633 166.8 590 kg 3132 2880 2871 2619 2652 2400

DD 840 int 4 x EFi250 int 844 222.4 665 kg 4092 3840 3744 3492 3452 3200

Connections: Gas - 32 mm Water - 32 mm TPR - 20 mm

Supply pressures: Gas (NG) - 1.13-3.5 kPa Gas (LPG) - 2.75 kPa Water - 700 kPa max.

Primary pump: Grundfos CM5-2, for more information refer to the Grunfos book supplied in the accessory pack

Ingress protection rating

: IPX4 (cylinder, control box, and Rinnai INFINITY)

Delivery rates, ﬁrst hour assumes the system has a full cylinder of hot water. Second hour delivery is the maximum output of the Rinnai INFINITY units.

For static recovery rates contact Rinnai.

All of these systems are connected to a 315 L Demand Duo cylinder.

Demand Duo Demand Duo CFHW with storage backup installation guide: 12583-B | 7

Dimensions

All dimensions are in mm.

700

1655

1750

External Model

Flue Terminal

Internal Model

Flue Terminal

2130

334

Cold Inlet

Cold

Inlet

Gas Inlet

Hot Outlet Hot Outlet

430

300

425 631

540

1905

385

695

INFINITY

Cylinder skid 1000 mm

Model INFINITY ‘A’ dimension

(total width of system - mm)

DD 400 external and internal 2 x HD200/HDi200 1770

DD 600 external and internal 3 x HD200/HDi200 2240

DD 800 external and internal 4 x HD200/HDi200 2540

DD 1000 external and internal 5 x HD200/HDi200 2920

DD 420 external and internal 2 x EF250/EFi250 2140

DD 630 external and internal 3 x EF250/EFi250 2540

DD 840 external and internal 4 x EF250/EFi250 3280

DD 500 external 2 x HD250 2140

DD 750 external 3 x HD250 2540

8 | Demand Duo CFHW with storage backup installation guide: 12583-B

General layout of system

The system layout below, depicting the DD400 system, highlights components

provided by Rinnai and components that are required to be supplied by the installer.

CM5-2 SS316 pump

Pipe and ﬁttings

by Rinnai

Pipe and ﬁttings

by Rinnai

Pipe and ﬁttings

by installer

Pipe and ﬁttings

by Rinnai

Alphastat

controller

Cold water inlet

32 mm ﬁtting on the left hand side of the cylinder, approximately 280 mm above the ground. For

ease of draining it is advisable to ﬁt a ‘tee’ piece with a capped valve or drain line between the

cold water isolation valve and cold water inlet connection on the Demand Duo cylinder.

Hot water outlet

32 mm ﬁtting on the left hand side of the cylinder. Ensure adequate insulation/lagging is ﬁtted to

the hot water pipe to minimise heat loss. Pipe sizing must be sized to allow suﬃcient water ﬂow

to the hot water ﬁxtures.

Pressure limiting valve

500 kPa.

Cylinder thermostat setting

To meet the New Zealand Building code requirement1to disinfect water for legionella bacteria2,

the cylinder thermostat has been set to 65 °C.

1 Clause G12.3.9, Acceptable Solution G12/AS1 6.14.3

2 Legionella is a bacterium that can cause Legionnaires’ disease―a severe form of pneumonia

Demand Duo Demand Duo CFHW with storage backup installation guide: 12583-B | 9

Connections

Expansion control valve (ECV)

The Demand Duo cylinder comes with an Expansion Control Valve (HT575) set to 700 kPa. This

valve allows for expansion of the water in the ﬂow and return during the initial heat-up period.

This should be ﬁtted to the cold water supply line.

TPR valves

Two 850 kPa TPR valves are supplied and ﬁtted to a 20 mm ﬁtting near the top of the cylinder.

Relief valve drain lines

Connect an independent 20 mm copper tube relief valve drain line to the TPR valve outlets.

Drain should be installed with a continuous fall toward a visible discharge point over a drain or

gully in accordance with AS/NZS 3500.4 sections 5.8 and 5.9.

• Drain line should not exceed 9 m in length

• Valves or other restrictions should not be installed with the relief vent line

• TPR valve drain line should not be joined to other drain lines

Return pump

A secondary or building return pump may be installed in conjunction with the Demand Duo hot

water system. Return line from the building loop is connected to the 32 mm return connection.

This is located just above the cold water inlet connection on the left hand side of the Demand

Duo cylinder.

If the secondary pump is not used a 32 mm brass plug should be ﬁtted to the 32 mm return

connection, located just above the cold water inlet connection.

Install an eﬀective ﬁlter to the circulating loop return line.

Gas connection

Check gas type of the Rinnai INFINITY matches the gas supply available on site.

Ensure gas pipe sizing is adequate to deliver the required volume/pressure. The pipe size used

on the inlet ﬁtting is no indication of the pipe size required. Refer to appropriate pipe sizing

chart in AS/NZS 5601.1.

Gas meter or LPG cylinders and regulator should also be of a suitable size to ensure suﬃcient gas

supply to the gas installation.

Purge gas line and ensure removal of debris prior to ﬁnal connection. Check for gas leaks using

suitable methods as listed in AS/NZS 5601.1

10 | Demand Duo CFHW with storage backup installation guide: 12583-B

Individual ueing of internal units

Flue gases can reach temperatures up to 200 °C. The ﬂue terminal is to terminate in

a location so as not to cause a nuisance, in accordance with AS/NZS 5601.1.

1. Direct ﬂueing: For installations where the internal continuous ﬂow unit is mounted directly

on the inside of an external wall.

2. Horizontal extension ﬂueing: The same as direct ﬂueing with additional pipe required due

to the longer horizontal distance.

3. Vertical straight ﬂueing: Installations where the internal unit is ﬂued vertically through the

roof.

4. Combination vertical and horizontal ﬂueing: A combination of all the above.

Important

• All heaters need to be ﬂued individually—refer separate installation guide for installing Rinnai

INFINITY gas hot water heater internal ﬂueing

• A condensate drain tube must be ﬁtted to HDi200* units if the vertical ﬂue length exceeds 1.5 m

• Internal models MUST BE ﬂued with a Rinnai approved ﬂue system

* EFi units have an inbuilt system to drain condensate

The Rinnai INFINITY internal gas hot water heaters are room sealed appliances—sealed from

the room as it takes air for combustion from the outside, and expels products of combustion

outside. No ventilation in the space where the water heater is installed is required. Each Rinnai

INFINITY water heater is ﬂued individually.

The ﬂueing for internal water heaters is a coaxial design. It has a stainless steel inner pipe to

discharge products of combustion and a thermoplastic outer pipe for air supply to the appliance.

Flueing options

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