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20
Rinnai Corporation Hydronic Furnace (37AHB) Manual
Installation
Figure 20: Hydronic Furnace Start-Up and ‘LED’ Troubleshooting - Flow Sensor (FS Configuration)
NOTES:
1 Pipe system between Tankless Water Heater and Hyronic Furnace ‡
2 Leak check piping system
3 Purge and prime plumbing system
4 Perform required electrical work
5 Check system operation with power to condensing unit off (if installed)
6 Control board is sometimes refered to as 'PCB'
7 Hyronic Furnace is sometimes refered to as 'RHF'
8 Typical for all check, ensure system is in the following operating mode:
AC / SINGLE STAGE
9 For Amp loads refer to specification sheet
10 Thermostat is sometimes refered to as 'T'STAT'
‡ Refer to plumbing section in this manual
NO
YES
IS 'LED' ON
WITH DOOR SWITCH CLOSED
(SET SYSTEM IN HEATING
MODE - CALL FOR HEAT)
YES
NO
START
SYSTEM
PURGED
CHECK VOLTAGE ACROSS'L1'
AND'L2'
RETURN TO PURGE & PRIME
STEPS ‡
IS 'LED'
RAPIDLY
FLASHING
STEADY 'LED' FLASH - NORMAL
OPERATION OR STAND-BY
MODEAWAITING
THERMOSTAT CAL
L
YES
NO
DOMESTIC HOT WATER
DEMAND PRESENT –SYSTEM
ON HOLD- SEARCH MODE
IS 'LED' RAPID
FLASH
CONSISTENT
YES
INCONSISTENT RAPID FLASH (PULSATING
PUMP OPERATION)– WRONG SHUNT
POSITION - REFER TOFIG.14 HYDRONIC
FURNACE CONTROL BOARD, JUMPER
(SHUNT) POSITION'P7'TO BE IN 'FS'
MODE
NO
CHECK BREAKER AND POWER
SUPPLY
IS POWER
SUPPLY OK
YES
NO
RECTIFY SUPPLY VOLTAGE
PROBLEM(S) ANDRETURN TO
START
VAC = 115V +/-
NO
CHECKDOOR SWITCH, IF
DEFECTIVE, REPLACESAME
ANDRETURN TO START
YES
GO TO24 VOLTS
TROUBLESHOOTING CHART
CHECK FOR LOOSE OR
BROKEN WIRE
CHECK SYSTEM WIRING
AGAINST WIRING DIAGRAM -
RECTIFY PROBLEM(S)
L1/L2 = 115V +/-
NO
YES
IS 'LED' ON
NO
YES