Setting Up A Cascaded System - Westinghouse WGRT 150 Series Installation Start-Up Maintenance Parts

Error Code Error Code Description
Flame Signal Detected
Er:72
before Ignition
Er:73 DIP Switch is abnormal
Er:76 Poor Communication
Cascade Communication
Er:78
Error
Exhaust NTC detects
Vent Temperature is
Greater than 149
Er:94 65
o
(190 F / 87.8
High Temp set point is
Selected)
Table 29 –Diagnostics and Suggested Corrective Actions
This water heater is equipped with a blocked vent shutoff system. If Error Codes Er:29, Er:41, or Er: 42 occur, turn off the gas valve at
the manual shutoff. Check the vent terminations for obstructions. If no obstructions are found, reset the water heater by pressing the
power button. If the error continues to occur, call a qualified service technician or the gas supplier to check the water heater. Failure to
follow these instructions could result in property damage, personal injury, or death.
J. SETTING UP A CASCADED SYSTEM
A maximum of eighteen (18) 199 models may be installed in a cascaded system. A maximum of four (4) 150 models may be installed in
a cascaded system. Installing more than the maximum amount of water heaters in a cascaded system will result in system problems,
property damage, and premature water heater failure. Such problems ARE NOT covered by product warranty.
DO NOT ATTEMPT to common vent 150 model water heaters. Doing so will result in property damage, severe personal injury, or
death.
Common Vented water heaters must be direct vented with an exhaust vent and intake air pipe vented to the outdoors. DO NOT power
vent Common Vented water heaters! Doing so will result in property damage, severe personal injury, or death.
For each floor containing bedroom(s), a carbon monoxide detector and alarm shall be placed in the living area outside the bedrooms,
as well as in the mechanical room that houses the heater. Detectors and alarms shall comply with NFPA 720 (latest edition). Failure to
comply with these requirements could result in product damage, severe personal injury, or death.
1. Connect the cascade communication cables to every unit (add resistor to the end of the last follower).
2. Program the Master:
10:Cn – Set the Cascade Address on the Master appliance. The Master should always be addressed 01.
11:CI – This option dictates the numbers of units that will operate during every demand (during start-up, it is recommended to
leave 01 [default] to avoid issues with low flows).
This Error Code will go away when the condition is remedied.
If Error happens again:
1. Check the water heater cover. Ensure it is secure. Flame detection sensor can detect an external
light source.
2. Check flame detection sensor. Ensure connections are secure. Normal operating settings are more
than 2.5DC before ignition, less than 2.5DC after ignition.
3. If the problem persists, replace the main control.
This Error Code will go away when the condition is remedied.
If Error happens again:
1. Check dip switches. Ensure switches match the ratings plate requirements of the water heater. See
dip switch details, this manual, for default settings.
2. If the problem persists, replace the main control.
This Error Code will go away when the condition is remedied.
If Error happens again:
1. Check connections from main control to display panel.
2. If the problem persists, replace the display and/or the main control.
NOTE: This error will only appear in a cascaded system.
1. Turn power OFF and ON at the appliance display panel.
2. If error reappears, ensure all cascaded appliances are powered ON.
3. If error reappears, check Installer Mode parameter 13 at the Master appliance. Ensure the number of
cascaded units chosen in this parameter matches the number of cascaded units in the system.
4. If error reappears, check Installer Mode parameter 10 at all cascaded appliances. Ensure the
address number matches that of the connected appliance (01 for Master, 02 for Follower 1, etc.) and
that no numbers are skipped or repeated.
5. Ensure every unit in the cascade system is connected properly. Inspect the cascade cables and
ensure all are connected without damage or defect. Repair or replace any damaged cables.
6. If the problem persists, replace the main control.
This Error Code will go away when the condition is remedied.
If Error happens again:
1. Check if dip switch High Fire setting is ON. Switches 6 and 7 should be OFF for normal operation.
o
F /
2. Check exhaust temperature sensor. Ensure connections are secure.
o
C
3. Check sensor resistance. If resistance is zero, replace the sensor.
o
C when
4. Check exhaust vent for blockage.
5. If the problem persists, replace the control.
6. If the problem persists, replace the heat exchanger.
Possible Remedies
59
WHL-004 REV. 5.26.17