46
Modbus / Gas Water Heaters
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Table 39.
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Value
Xi 1.0 State
MXi State
1
2II6WDQGE\
2II6WDQGE\
2
Pre-Purge
Pre-Purge
3
Igniter Warmup
Igniting
4
Ignition Activation
Gas Valve On
5
,JQLWLRQ9HUL¿FDWLRQ
Inter-Purge
6
Inter-Purge
Heating
7
Heating
Post-Purge
8
Post-Purge
In Fault
9
Fault
Xi 1.0 Energy Management System (EMS) Control
;LXVHVDVLQJOHELWVHWWLQJPHWKRG:LWKLQWKH(060RGH6WDWXVSRLQWRQHELWFRPPDQGELWVHWVLWLQ(06PRGHDQGRWKHUHQGV
(06PRGH2QFHLQ(06PRGHDQRWKHUELWFRPPDQGELWHQDEOHVKHDWLQJDQRWKHUGLVDEOHVKHDWLQJ
2QFHLQ(06PRGHWKH(060RGH5HIUHVKFRPPDQGPXVWEHSHULRGLFDOO\LVVXHGZKLFKFOHDUVDWKLUGELWELWWRPDLQWDLQ(06PRGH
otherwise the heater will end EMS mode and resume normal operation.
Table 40. Xi 1.0 Energy Management System (EMS) Control
Decimal
Hex
Value
Response
3840
0x0F00
No EMS control
[
3841
0x0F01
Put into EMS Mode^
[&
0000
0x0000
EMS Disable heating^
[&
0001
0x0001
EMS Enable heating^
[&
3584
0x0E00
(060RGH5HIUHVKAPXVWZULWHZLWKLQVHFRQGVRU
EMS mode ends.) 15 seconds or less recommended
[&RU[&GHSHQGLQJRQZKHWKHU
or not heating is enabled.
Notes:
•
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•
'HSHQGLQJRQZKHQ\RXSROOWKHUHJLVWHU\RXPD\UHDGELWDVZKLFKLVZK\D³&´LQKH[DGHFLPDOIRUPPLJKWEULHÀ\UHSO\ZLWK³´7KLVLVGXHWRWKHFRQWUROVHWWLQJ
WKLVELWDQGLILWQRWFOHDUHGSHULRGLFDOO\E\WKH%$&QHWFRPPDQGKHDWLQJLVGLVDEOHG
• After disabling EMS mode with write of 3840, read back might have bits 14 and 1 possibly still set. To make sure these bits are clear, write a 0000 to clear bit 1 and 3584
to clear bit 14.
Mxi Energy Management System (EMS) Control
Mxi EMS control is written as a single command to place in EMS mode and enable or disable heating.
Once in EMS mode the EMS Mode Refresh command must be periodically issued to maintain EMS mode, otherwise the heater will end
EMS mode and resume normal operation.
Table 41. Mxi Energy Management System (EMS) Control
Decimal
Hex
Value
Response
0
0x0000
No EMS control~
[
32768
0x8000
EMS Disable Heating^
[&
32769
0x8001
EMS Enable Heating^*
[&
Notes:
~
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a 0 to it. Power cycling only can clear EMS mode.
^
'HSHQGLQJRQZKHQ\RXSROOWKHUHJLVWHU\RXPD\UHDGELWDVZKLFKLVZK\D³&´LQKH[DGHFLPDOIRUPPLJKWEULHÀ\UHSO\ZLWK³´7KLVLVGXHWRWKHFRQWUROVHWWLQJ
WKLVELWDQGLILWQRWFOHDUHGSHULRGLFDOO\E\WKH%$&QHWFRPPDQGKHDWLQJLVGLVDEOHG
*
EMS command to heat must be sent every 30 maximum or heating will be disabled.
Summary of Contents for ETH-1000
Page 53: ...53 NOTES NOTES...
