User Manual

Rinnai Corporation Hydronic Furnace (37AHB) Manual 23
Installation
Figure 23: 24V Troubleshooting - Flow Sensor (FS) Configuration
24V BETWEEN THERMOSTAT AND PCB
24V BETWEEN CONDENSING UNIT AND PCB
If a condensing unit and cased coil set is used in conjunction with the Rinnai Hydronic Furnace for cooling,
refer to air conditioning manufacturer's instructions for hook-up and troubleshooting details.
NO
FINISH
ENSURE THAT T'STAT IS IN
HEATING MODE AND RECHECK
FOR CONTINUITY
NO
NO
YES
CONTACT TECH. SUPPORT
SYSTEM
WORKING
YES
NO
WITH DOOR SWITCH CLOSED
(SET SYSTEM IN HEATING
MODE -CALL FOR HEAT)
START
IS 'LED' ON
YES
NO
PRI:VAC = 115V +/
-
SEC: VAC = 24V +/
-
YES
NO
GO TOHYDRONIC FURNACE START UP
AND 'LED' TROUBLESHOOTING
VAC = 24V +/-
YES
CHECK 3 AMP
FUSE; IS FUSE
INTACT
(1) CHECK FORWIRING PROBLEM(S)
(2) CHECK TRANSFORMER; IF DEFECTIVE,
REPLACE FAULTY COMPONENT
(1) CHECK FOR WIRING PROBLEM(S)
(2) CHECK FUSE; IF DEFECTIVE,
REPLACE FAULTY COMPONENT
IS THERE
CONTINUITYAT
T'STAT
CHECK T'STAT FOR CONTINUIT
Y
WITH OHM METER BETWEEN
'R'
AND 'W'
YES
IS THERE
CONTINUITYAT
T'STAT
YES
CHECK THERMOSTAT; IF
DEFECTIVE REPLACE
COMPONENT
CHECK FOR 24 V ACROSS
'WH/FS' PINS
CHECK PCB; IF DEFECTIVE
REPLACE COMPONENT AND
RETURN TO START
NO
CHECK FOR WIRING
PROBLEM(S) AND REPAIR OR
REPLACE AND RETURN TO
START
CHECK TRANSFORMERFOR
CORRECT VOLTAGES