Main Heating Main Heat 12, Инструкция по установке и обслуживанию

Страница: 15 / 83

from the boiler and include any branches ( Fig. 9 ).
Fig. 9
Fig. 10
6.4 Low Head Installation
1. Using a close couple arrangement the minimum head is as shown in the diagrams ( Figs. 10 & 11 ) subject to the following conditions:
a) The pump being adjusted to give a 20°C drop across the boiler.
b) The pump must be fitted on the flow.
c) The pump must be fitted in accordance with the pump manufacturer's instructions.
d) The open vent pipe must be taken up from a tee in a horizontal section of the flow pipe.
An alternative Low Head Installation ( Fig. 12 )
2. For heads below 400mm then a combined vent and feed pipe may be connected. This must be a minimum of 22mm diameter. It is recommended that
an air separator is fitted when using a combined feed and vent pipe.
Fig. 11