Xylem EHR IM Electrical heater series EHR (obsolete) User Manual download pdf (Page 8)

8.) Pump shut-off

If pump shut-off is enabled the pump only starts when heat is

required by a room-stat or timer (see also page 6 + 7) and

runs for about two minutes after the heating has turned off by

the room-stat or timer. If the pump shut-off is disabled, pump

is always operating, when main switch is on.

9.) Startup

The heating system must be built according to applicable

design rules (fill and drain valve, expansion tank, safety relief

valve, pressure gauge etc.) The EHR requires a minimum flow

rate of 0.2 gallon/min. This can be realized using a spring

loaded bypass valve or a small bypass (already integrated in

Laing open tanks !) After filling the system, set the

temperature to minimum (68°F). Open the valves of the

manifold if one is attached. Thereafter, power up the EHR.

After making sure that the pump is circulating you can raise

the temperature with the temperature setting button. If the

pump is not circulating, re-fill the system and purge any

remaining air. Make sure to disconnect power before doing so

(during dry run the heater shell may reach up to 340°F for a

short time!). If the pump is circulating but flow noises are

audible you can aid the air removal by power cycling the pump

in 10 second intervals until the noise subsides.

Jumper closed

Pump shut off

enabled

Jumper open,

pump shut off disabled

(factory setting)

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Xylem EHR IM Electrical heater series EHR (obsolete) User Manual Page 8