Spirax Sarco DP27T Installation And Maintenance Instructions Manual page 42

Temperature in plant too low
7.15 If the temperature in the plant is below the normal control setting this could be caused
by one of the following:
7.16 Lack of steam supply. Check that steam is turned on and that the strainers are clean.
7.17 Pipe assembly blocked. Remove by uncoupling unions and blow through to clear
obstruction.
7.18 Diaphragm fractured.
Pilot valve packless gland leaking
7.19 If, with the control head removed and steam on the valve, steam is seen to be leaking
from the top of the hexagon nut it indicates failure of the packless gland.
Replace as Section 5.9.
42 IM-P240-02-EN-ISS1 CTLS