Bradford-White Corp M-2-50T6DS service manual Tank Does Not Deliver Enough Hot Water

SERVICE PROCEDURE RE-IV

Light Duty Commercial

Thermostat Testing

Double Element, Non-Simultaneous, Three Phase Operation.

Water In Tank Is Cold With Power ON.

1.This procedure assumes line voltage, ECO and elements are in working order.

2.Turn power “ON” to water heater.

3.Set multi-meter to “Volts AC”

4.Check across terminals L4 and T2 of upper thermostat (see illustration 41).

A)Rated voltage NOT present, Recheck upper ECO. If ECO is okay, replace thermostat.

B)Rated voltage IS present, proceed to next step.

5.Check across element terminals (see illustration 42).

A)Rated voltage NOT present, check wire connections from thermostat to element.

B)Rated voltage IS present, Repeat element testing see page 15.

WARNING

High voltage exposure. Use caution to avoid

personal injury during this procedure.

Illustration 41 Illustration 42

Tank Does Not Deliver Enough Hot Water.

1.This procedure assumes line voltage, ECO and elements are in working order.

2.Turn power “ON” to water heater and set multi-meter to “Volts AC”

3.Adjust temperature setting of upper & lower thermostat to the Highest setting. Water temperature in tank must be below thermostat setting for this test.

4. See illustration 41 above. Check voltage across terminals L4 & T2 of upper thermostat.

A) Rated voltage IS present, okay, upper thermostat is calling
for heat. Go to step 5 below.
B) Rated voltage NOT present, replace upper thermostat.
5. Adjust temperature setting of upper thermostat to the minimum
setting. Water temperature in tank must be above thermostat setting
for this test.
6. Check voltage across terminals L3 & T4 of upper
thermostat (see illustration 43).
A) Rated voltage NOT present, replace upper thermostat.
B) Rated voltage IS present, upper thermostat is okay. Go to	Illustration 43
step 7 on next page.

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