Rheem GTC Series Guía para resolver problemas descargar pdf (Pagina 41)

Third Procedure is a pressure test and requires a digital manometer capable of reading positive and

negative pressures. A good range of operation would be +15.00 “W.C. to -15.00 “W.C. (inches water column)

with a resolution of 0.01 “W.C. Recommend the UEI model EM-200 or Extech model 406850 dual pressure

digital manometers, not shown here.

To determine if an air pressure switch is operating properly you must know the “pressure activation” point for the

switch and whether it activates on a rise or a fall in pressure. The activation point is a given pressure value and

may be a positive or negative (in a vacuum) pressure. This information is often provided on the switch label (see

image above). Whether the switch activates on a rise or fall in pressure is the type of switch action, this

information is available here (page 7) for most current residential and commercial fan assisted water heaters.

Contact the technical information center 800 527-1953 when the activation point and/or switch action are not

known. Have the complete water heater Model, Serial, and Series number on hand before calling.

Taking Air Pressure Readings: Disconnect the pressure sensing tube from the sensing port on the

switch, leave the other end connected. Examine the sensing tube connection on the water heater, check for

wear, leaks, kinks, or any kind of debris or condensate in the sensing tube, repair/replace as necessary. Connect

a digital manometer to the pressure switch end of the sensing tube as shown above. Turn the power on and

ensure a call for heat is active. When the blower starts and comes up to full speed, record the pressure reading.

Normally Open Switches: Normally open air pressure switches must close their contacts after the blower

is energized, the pressure reading taken must reach or exceed the activation point (pressure value) for the

pressure switch being tested or the contacts will not close.

Pressure reading taken DOES NOT reach activation pressure:

DO NOT replace the air pressure switch if the contacts do not close during second procedure. The switch is not

defective. IE: Residential power vent product - the pressure switch on these products is a “normally open -

closes on a fall in pressure” switch (see page 7). If the activation point for the switch is - 1.07” W.C. and the

actual pressure reading taken was - 0.85" W.C., the actual pressure has not reached the activation point. The

switch contacts will not close until the pressure reaches or exceeds - 1.07" W. C..

Air Pressure Switch Testing (cont)

The pressure activation point for the air pressure

switch below is - 1.07" W. C. (inches water column)

This is a negative pressure value – in a vacuum.

Blocked Vent Air Pressure Switch

Residential Power Vent Model

Blocked Vent Switch - Pressure Test

Vertex Residential Power Vent Model

AHSA02307 5 of 8

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Rheem GTC Series Guía para resolver problemas Pagina 41