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The temperature control for a hot water system is very erratic with the temperature gradually rising and then suddenly falling and vice versa even though system demand is fairly constant.

The heating medium is steam.

What may cause this problem?

15 Sep, 04:44

Sept. 15, 2020, 4:44 a.m.
3Eng's gravatar image


Most probably, control valve gland is over tightened.

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15 Sep, 04:45

Sept. 15, 2020, 4:45 a.m.
cheng's gravatar image

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