Rinnai 37AHA04508KA5 Installation, Operation And Maintenance Manual page 20

Installation
START
SYSTEM
PURGED
YES
WITH DOOR SWITCH CLOSED
(SET SYSTEM IN HEATING
MODE - CALL FOR HEAT)
IS 'LED' ON
NO
CHECK BREAKER AND POWER
SUPPLY
IS POWER
SUPPLY OK
YES
CHECK VOLTAGE ACROSS'L1'
AND 'L2'
VAC = 115V +/-
YES
‡ Refer to plumbing section in this manual
Figure 20:
Air Handler Start-Up and 'LED' Troubleshooting - Flow Sensor (FS Configuration)
20
NO
RETURN TO PURGE & PRIME
STEPS ‡
YES
IS 'LED'
RAPIDLY
FLASHING
STEADY 'LED' FLASH - NORMAL
OPERATION OR STAND-BY
MODE AWAITING
THERMOSTAT CAL L
NO
RECTIFY SUPPLY VOLTAGE
PROBLEM(S) ANDRETURN TO
START
NO
CHECK FOR LOOSE OR
BROKEN WIRE
CHECK DOOR SWITCH, IF
DEFECTIVE, REPLACE SAME
AND RETURN TO START
GO TO 24 VOLTS
TROUBLESHOOTING CHART
NO
IS 'LED' ON
YES
Rinnai Corporation Hydronic Air Handler Manual
NOTES:
1 Pipe system between Tankless Water Heater and Air Handler ‡
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 Air Handler is sometimes refered to as 'AHU'
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'
YES
NO
DOMESTIC HOT WATER
DEMAND PRESENT –SYSTEM
ON HOLD - SEARCH MODE
INCONSISTENT RAPID FLASH (PULSATING
PUMP OPERATION)– WRONG SHUNT
POSITION - REFER TO FIG.14 AIR
HANDLER CONTROL BOARD, JUMPER
(SHUNT) POSITION'P7' TO BE IN 'FS'
MODE
CHECK SYSTEM WIRING
AGAINST WIRING DIAGRAM -
RECTIFY PROBLEM(S)
NO
L1/L2 = 115V +/-
IS 'LED' RAPID NO
FLASH
CONSISTENT
YES
YES