Справочник Пользователя для Rheem Gas Heavy Duty Water Heater Models 265 Litre and 275 Litre

18 

MAINS WATER SUPPLY 
Where the mains water supply pressure exceeds that shown in the table below, 
an approved pressure limiting valve is required and should be fitted as shown 
in the installation diagram 

(refer to installation diagram on page 

25

)

. 

 

Relief valve setting 

1000kPa 

Expansion control valve setting* 

850kPa 

 

With expansion control valve 

680kPa 

Without expansion control valve 

800kPa 

* Expansion control valve not supplied with water heater 

 
TANK WATER SUPPLY 
If the water heater is supplied with water from a tank supply, then the bottom of 
the supply tank must be at least 1 m above the highest hot water outlet and 
care taken to avoid air locks. The cold water line to the water heater should be 
adequately sized and fitted with a full flow gate valve or ball valve. 
 
HOT WATER DELIVERY 
This water heater can deliver water at temperatures which can cause scalding. 
 
It is necessary and we recommend that a temperature limiting device be fitted 
between the water heater and the hot water outlets in any ablution and public 
areas such as bathrooms, ensuites or public amenities, to reduce the risk of 
scalding. The installing plumber may have a legal obligation to ensure the 
installation of this water heater meets the delivery water temperature 
requirements of AS/NZS 3500.4 so that scalding water temperatures are not 
delivered to a bathroom, ensuite, or other ablution or public area. 
 
Where a temperature limiting device is installed adjacent to the water heater, 
the cold water line to the temperature limiting device can be branched off the 
cold water line either before or after the isolation valve, pressure limiting valve 
and non return valve to the water heater. If an expansion control valve is 
required, it must always be installed after the non return valve and be the last 
valve prior to the water heater. 
 
If a pressure limiting valve is installed on the cold water line to the water heater 
and the cold water line to a temperature limiting device branches off before this 
valve or from another cold water line in the premises, then a pressure limiting 
valve may be required prior to the temperature limiting device.