Commercial Storage Gas
Model Number: Heavy Duty Gas Indoor A621275
Rheem Heavy Duty Gas water heaters have been designed to supply large quantities of hot water. The cylinder is protected by multiple anodes and a double layer of vitreous enamel.
- Designed for greater protection
- Adjustable thermostats
- Equa-Flow® system allows for flexibility in installation
|DIMENSIONS AND TECHNICAL DATA TABLE - INDOOR MODEL|
|Weight - Empty||kg||187|
|Inlet/Outlet Connections (BSPF)||RP1¼/32|
|Gas Connection (BSPF)||RP¾/20|
|T&PR Valve Connection (BSPF)||RP¾/20|
|T&PR Valve Setting||kPa||1000|
|Expansion Control Valve (ECV)10 Setting||kPa||850|
|without ECV10 fitted||kPa||800|
|with ECV10 fitted||kPa||680|
|Max. Thermostat Setting||°C||82|
|Factory Thermostat Setting||°C||70|
|Min. Thermostat Setting||°C||60|
|Manifold - Min. Centre to Centre||mm||890|
|Electrical Connection||2m 10A Plug and Lead|
|Electrical Rating 240V 50Hz||150 Watts|
No. of Units
|Thermal Input||Litres hot water at 50°C rise over peak period (based on natural gas)|
|(Litres)||(MJ/h)||1 hour||2 hours||3 hours||4 hours||6 hours||8 hours|
|No. of Units in Parallel||Initial Storage Capacity||Thermal Input||Litres hot water at 65°C rise over peak period (based on natural gas)|
|(Litres)||(MJ/h)||1 hour||2 hours||3 hours||4 hours||6 hours||8 hours|
Operations at temperatures above 80°C
Rheem commercial gas models 621 265, 631 265, 621 275, 631 275 are designed to operate at temperatures up to 82°C for sanitising and other applications.
Where the water supplied by the water heater is required consistently at any temperature above 80°C, we strongly recommend you use a pumped recirculation system. (Please refer to the Equa-Flow® section.)
Gas pipe supply
The gas supply piping should be sized in accordance with AS/NZS5601.1
The gas supply pipe must be sized so that the minimum gas pressure is available at the inlet to each water heater when all appliances are operating at maximum gas consumption.
The minimum gas pressures are 1.13 kPa for natural and SNG, 2.75 kPa for propane and butane and 0.75 kPa for town gas and TLP.
|TECHNICAL GAS PERFORMANCE DETAILS|
|Min. Gas Supply Pressure||kPa||1.13||2.75||2.75|
|Test Point Pressure||kPa||0.90||2.65||2.65|
|Max. Gas Supply Pressure||kPa||3.5||3.5||3.5|
|Litres Recovery Per Hour at Rise of||20°C||1870||1780||1500|
Approximate daily energy consumption
These daily gas consumption figures are approximate. They’re based on:
- A daily usage of hot water per water heater in litres, at 50°C rise
- Using natural gas, but they can be used with reasonable accuracy for other gas types
- Mains pressure supply systems only
The figures do not allow for pipe heat losses. An additional allowance must be made for large manifold systems and installations designed with a circulated flow and return system.
Use the table to calculate
- The approximate energy cost for a particular installation
- The average daily hot water consumption when the energy consumption is known
|APPROXIMATE DAILY ENERGY CONSUMPTION|
|Daily Hot Water Usage @ 50°C Temp Rise||Energy Content of Hot Water||Approximate Energy Used Per Day Natural Gas|
To convert to kg of Propane, divide MJ by 49.5. To convert to litres of Propane, divide MJ by 25.3.
Ventilation for indoor gas water heaters
It’s a requirement of AS/NZS5601.1 that indoor gas water heaters (non room sealed) are installed in a location with adequate ventilation.
Two permanent openings are required into the room housing the water heaters.
The distance from the top of the upper opening to the ceiling and from the bottom of the lower opening to the floor, cannot each exceed 5% of the room height.
The two openings can be combined, as long as the top and bottom of the opening are within the 5% distance requirement.
The minimum vertical dimension of any free ventilation opening is 6mm.
The minimum free ventilation area of each opening required for each Rheem commercial gas water heater installed is shown in the table.
Please refer to AS/NZS5601.1 for full details of the requirements.
- Although a room sealed water heater installation draws the air required for combustion from outside, ventilation may be necessary to prevent a rise in the ambient temperature in the room.
- In plant rooms, wherever possible more than one wall should be used to provide ventilation. This allows a flow of air across the room and helps prevent excessive temperatures in the room.
- In rooms other than plant rooms, ventilation is required if the total thermal input of the water heaters exceeds 3 MJ/h per cubic metre of room volume.
- AS/NZS5601.1 should be consulted for further requirements when ventilating through adjacent rooms to the water heater installation.
(Area of Each Opening Per Water Heater)
(Per Water Heater)
|Location of Water Heater|
|Plant Room||Non Plant Room||Low Level||High Level|
Natural air supply with a mechanical exhaust is not permitted.
You can either install an individual Rheem gas model or a bank of multiple 621 265, 621 275 models with a power flue.
It’s essential to prove the flue system operates correctly before the main burner is allowed to operate.
How do you achieve this? A self proving relay interconnected with either a vane switch or pressure differential switch will prove both air flow and functionality of the control circuit before ignition of the main burner.
Please refer to AS/NZS5601.1 for full details of what’s required.
For multiple installations, the operating principle is the same as for a single water heater.
Any water heater can switch on the fan, and the burners can only come on when the sail switch is closed.
Intermittent PowerFlue Fan Control – Multiple Water Heater Rheem 621 Series & Raypak Type B Series.
Power Flue and Remote control
Rheem commercial models 621 265, 631 265, 621 275, 631 275 may be controlled by a remote device such as a time clock, remote isolating switch, pressure switch or sail switch. Additionally, Rheem can assist with Power Flue design solutions for Rheem and Raypak® commercial gas water heaters. For further details please contact your local Rheem technical advisory service.
Fluing: indoor gas water heaters
Rheem indoor gas water heaters are designed for connection to a flue system in accordance with the requirements of AS/NZS5601.1.
Manifolded water heaters can either be flued individually or connected to a common flue. The design of the flue must comply with Appendix H of the Standard.
AS/NZS5601.1 states the vertical rise directly out of the water heater must be the maximum possible height before any change in direction.
Also, the total length of the lateral (horizontal) section must be as short as possible, not exceeding 50% of the total flue height of the system.
The table and diagram below are extracted from the Flue Tables in AS/NZS5601.1 and are meant as a quick guide only. Any variations should be referenced from AS/NZS5601.1.
Appropriate authorities should be consulted before any work is commenced on flues other than single appliance flues.
Multiple Manifold Flue System
|FLUE SIZING FOR GAS WATER HEATERS|
|Total Flue Height||Max. Lateral||Flue Dia||Max. Manifold||Flue Dia||Max. Manifold||Flue Dia||Max. Manifold||Flue Dia||Max. Manifold||Flue Dia|
|(H)||Length (A)||Length (A)||Length (A)||Length (A)|
- The table is based on a natural draft system with an insulated type flue or a flue installed indoors
- The table is extracted from the Flue Tables in AS/NZS5601.1 and is meant as a quick guide only. Any variations should be referenced from AS/NZS5601.1
|Performance Calculator||View Online|
|Sample Specification||View Online|
|Flue Damper||View Online|
|Product Drawings - 1 Unit||Download|
|Product Drawings - 2 Units||Download|
|Product Drawings - 3 Units||Download|
|Product Drawings - 4 Units||Download|
|Product Drawings - 5 Units||Download|
|Product Drawings - 6 Units||Download|
|Product Drawings - 7 Units||Download|
|Product Drawings - 8 Units||Download|