Diagnostic Test Points - Rheem 862 27 Series Service Instructions Manual

DIAGNOSTIC TEST POINTS

Measurement Point
No. Connection
1 A
2 T
3 S
4 J
5 P
6 P
7 P
17 P
8
U
14
9 P
10 W
11 G
12 W
13 W
18 W
15 N
22 M
TM049 27L Continuous Flow Service Instructions
REV AL – Issued April 2019
This document is stored and maintained electronically by Rheem Technical Support. All printed copies are deemed "uncontrolled".
Normal Value
Wire
Colour
BL1 – BR4
216~264 VAC
W1 – W2 50kΩ – 500kΩ
2 – 5 VDC (pulse)
BR1 – BK2
>1310 pulses/minute
R3 – BK2 11 – 17 VDC
BL4 – W6
(outdoor)
144 – 192 VDC
BK4 – R6
(indoor)
R3 – BL4
(outdoor)
12 - 18 VDC
W3 – BK4
(indoor)
Y1 – BL4
4 – 10 VDC (Pulse)
(outdoor)
BL1 – BK4
>4800 pulses/minute
(indoor)
W6 – BK3
Refer to thermistor
Y5 – BK3
resistance chart on
R4 – BK3
following page.
BL7 – BK3
0.3 – 100VAC
W1 – GND
1 – 100VAC
1.5 – 14 VDC
R1 – BK2
75 – 100 VDC
Y1 – BK8
0.8 – 2.4kΩ
R1 – R4
90 - 110VAC
75 – 100VDC
W2 – BK8
0.8 – 2.4kΩ
75 – 100VDC
R5 – BK8
0.8 – 2.4kΩ
75 – 100VDC
BL6 – BK8
0.8 – 2.4kΩ
W2 – BK8 8 – 16VDC
R7 – BK8 8 – 16VDC
Less than 1VDC (Limiter
GR6 – BK8
on) 4 – 6VDC (Limiter Off)
W2 – BK8 8 – 16VDC
R7 – BK8 8 – 16VDC
Less than 1VDC (Limiter
GR6 – BK8
4 – 6VDC (Limiter Off)
Main Power.
Over Heat Limiter.
Water Flow Sensor pulse signal.
(Only when water is flowing)
Water Flow Sensor.
Fan Motor has proper voltage.
Fan Motor has proper voltage.
Fan Motor producing a regular pulse.
Cold water inlet thermistor.
Heat exchanger thermistor.
Hot water outlet thermistor.
Ambient air thermistor.
Flame rod not detecting flame.
Flame rod detecting flame.
PGFR (Proportional Gas Flow
40 – 80Ω
Regulating Valve)
GISV 0 (Gas Inlet Solenoid Valve 0)
(Primary fuel inlet to gas valve)
Igniter
Solenoid valve (SV1)
(Fuel to ODS and front right burner)
Solenoid valve (SV2)
(Fuel to back right burner)
Solenoid valve (SV3)
(Fuel to left side burner)
Water volume control motor has
proper voltage.
Water volume control motor has
proper voltage.
Water volume control motor position
switch is normal.
Water bypass control motor has
proper voltage.
Water bypass control motor has
proper voltage.
Water bypass control motor position
on)
switch is normal.
Point to Check
39