Potterton Isis HE Installation, Operation & Maintenance Manual page 5

POTTERTON COMMERCIAL PRODUCTS DIVISION
INSTALLATION, OPERATION & MAINTENANCE MANUAL
ISIS HE
1. FUEL CONSUMPTION
Gas fuel consumption is based on natural gas with a gross calorific value of 38.6 Mj/m
should be corrected for the meter supply pressure particularly on high pressure supplies to prevent
overfiring.
Oil fuel consumption is based on Class D (35 second) gas oil with a gross calorific value of
45.5 Mj/kg. Kerosene has a gross calorific value of 46.5 Mj/lit.
2. MINIMUM OPERATING PRESSURE
This is the minimum operating pressure of the boiler with pumps operating (NOT static pressure). The
requirements of the Health & Safety Executive guidance note PM5 regarding maximum operating
temperatures should be observed.
3. BOILER FLUE CONNECTION
This is the nominal flue size of the flue connection spigot, for dimensional details of the flue connection
spigot see Fig.1. Actual flue size required to achieve correct draught and operation under all running
conditions may need to be increased.
4. FLUE GAS VOLUME
Flue gas volumes are given at STP (standard temperature and pressure 15°C and 1013.25 mbar). Typical
flue gas temperatures are 220°C at CO
5. NATURAL VENTILATION
The sizes indicated are free grille areas and are based on a single boiler installation.
6. MECHANICAL VENTILATION
The volume given is for a single boiler installation.
7. WATER CONNECTION SIZES
The boiler connections are flanged with 3'' BSP screwed counter flanges provided. For further details on
water connections see Fig.3 and Fig.4 3'' – 4'' extension turrets are provided with 4" weldable flanges.
8. WATER FLOW RATES
Water flow rates are given for boiler flow and return temperature differences of 11°C and 20°C.
9. COLD FEED/OPEN VENT/SAFETY VALVE SIZES
Sizes indicated are minimum sizes for single boiler installations.
10. MINIMUM RETURN TEMPERATURE
If system return temperatures below 55°C are required then contact the Potterton Commercial Technical
Department.
11. WEIGHT
The dry weight is exclusive of the burner and gas train, see burner data table for relevant burner weights.
Each section measures approximately 1.4m x 1m x 0.18m and weights 196kg (front), 185kg (intermediate)
and 200kg (rear).
NOTE: ANY PERSON OR PERSONS MOVING OR LIFTING SHOULD BE TRAINED IN MANUAL
HANDLING TECHNIQUES AND IF NECESSARY USE SUITABLE LIFTING EQUIPMENT TO REDUCE
THE RISK OF INJURY TO THEMSELVES OR OTHER PEOPLE.
12. Some burners may require higher than 17.0 mbar inlet pressure, please see relevant burner card for
details, or contact the Commercial Technical Office.
levels of 9% and 12% respectively on gas and oil
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. The gas rate