Component

Type of Test

Power Status

On / Off

Expected Results

Incoming Power Lugs (Control Board)

BACK TO TOP?

Verify Power to Lugs — Voltage

On

Phase Check Measurements

(Individual Circuit)

L1 to L2 208 — 240 Volts (AC)

L1 to Ground 110 — 120 Volts (AC)

L2 to Ground 110 — 120 Volts (AC)

Sequence Check Measurements (Circuit to Circuit)

L1 to L1 0 Volts (AC)

L2 to L2 0 Volts (AC)

Temperature sensors

(Chamber)

BACK TO TOP?

Continuity — Ohms

Off

Ohm readings should be taken after the heater has been cooled down so that the temperature in the chamber is uniform. All temperature sensors should read within 25 ohms of each other.

For EXAMPLE, on an RA-28 with a 50 deg. F inlet water temp., the expected temperature sensor readings may read as follows:

THIN ~ 358 Ohms

TH1 ~ 348 Ohms

TH2 ~ 353 Ohms

TH3 ~ 346 Ohms

TH4 ~ 351 Ohms

Most temperature sensor readings will fall within 200 to 400 ohms, provided the heater is cooled down first.

High Temperature Limit Switch

(Chamber)

Continuity —

Ohms

Off

Should read —0- ohms

If test shows open, press the reset button and retest

Heating Element

(Chamber)

BACK TO TOP?

Continuity —

Ohms

Off

Read across screws at the Red & Black wires. Ohm readings should fall into the following range (also allow +/- 1% tolerance):

4500W ~ 12.5 to 13.5 Ohms

5500W ~ 9.5 to 10.5 Ohms

7000W ~ 7.5 to 8.5 Ohms

Component

Type of Test

Power Status

On / Off

Expected Results

Heating Element

(Control Board)

BACK TO TOP?

Full Flow Test —

Amps

On

On

With the power on to all circuits, and water running at full flow at a sink or tub faucet, measure the amps on each Red or Black element wire, going from the control board to the element. Maximum expected readings as follows:

RA-28 ~ 29 amps ea.

RA-22 ~ 23 amps ea.

RA-18 ~ 19 amps ea.

RA-14 ~ 29 amps ea.

RA-11 ~ 23 amps ea.

RA-9 ~ 19 amps ea.

Allow for +/-10% tolerance in readings due to meter error.

Heating Element

(Control Board)

Modulation Test — Amps

On

With power on and water at _ (half) flow at the sink faucet, check amps at each element. Power should modulate and amp readings may fluctuate, but all should read approximately the same amps.

Level Detector Switch

(Chamber)

Ohms

Off

Each contact should read -0- ohms to ground.

Moisture Detector Switch

(Control Board)

Ohms

Off

Should normally read open. If reading continuity, check for water leaks or water on the switch pad (mounted on the bottom of the base pan). Correct the leak or dry the switch and retest.