|
COMPONENT |
TYPE OF TEST |
POWER STATUS (ON/OFF) |
EXPECTED RESULTS |
| Incoming
Power Lugs (Control Board) |
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) |
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) |
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) |
Full Flow Test
— Amps |
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. |
