44
Modbus / Gas Water Heaters
Table 38. ModBus Gas Water Heaters Register List
Register Name
(Description)
Register Type Address
R/W
Units
Min
Value
(if W)
Max
Value
(if W)
Lower Temperature
/RZHURU6HFRQGDU\7HPSHUDWXUH
Input Register 4
R
ºC x 512
Tank Temperature
&RQWUROOLQJ7DQN7HPSHUDWXUHDOJRULWKPLFDOO\
calculated)
Input Register 6
R
ºC x 512
Setpoint Temperature
Holding Register 7
5:
ºC x 512
)
32.2
82.2
SetPoint Differential
Holding Register 8
5:
ºC x 512
)
1.1
11.1
&&%&RQWURO6WDWH
Input Register 1040
5:
See
7DEOH
EMS Status
Holding Register 90
5:
See
7DEOH
;L
or
7DEOH
0;L
32.2
82.2
EMS Percent Commanded
2
Holding Register 91
5:
%
0%
100%
Fault Code
Input Register 1041
R
See
7DEOH
.
Alert Code
Input Register 1042
R
See
7DEOH
.
;L&DOO)RU+HDW
Input Status 182
R
)DOVH
7UXH
0;L&DOO)RU+HDW
Input Status 70
R
)DOVH
7UXH
Upper Temperature Probe Open
Input Status 65
R
)DOVH
7UXH
Upper Temperature Probe Short
Input Status 66
R
)DOVH
7UXH
Temperature Probe ECO status
Input Status 156
R
2SHQ
&ORVHG
Lower Temperature Probe Open
Input Status 73
R
)DOVH
7UXH
Lower Temperature Probe Short
Input Status 74
R
)DOVH
7UXH
Igniter Current detected
;LRQO\
Input Status 148
R
1R&XUUHQW
2.
Flame Current
Input Status149
R
1R)ODPH
)ODPH'HWHFWHG
%ORZHU3URYH3UHVVXUH6ZLWFK
3
Input Status 151
R
2SHQ6ZLWFK
&ORVHG6ZLWFK
External Vent Pressure Switch
External T’stat Switch
;LRQO\IXQFWLRQ',3VHOHFWDEOH
Input Status 152
R
2SHQ6ZLWFK
&ORVHG6ZLWFK
%ORFNHG([KDXVW3UHVVXUH6ZLWFK
3
Input Status 153
R
2SHQ6ZLWFK
&ORVHG6ZLWFK
%ORFNHG,QOHW3UHVVXUH6ZLWFK
3
Input Status 154
R
2SHQ6ZLWFK
&ORVHG6ZLWFK
Low Gas Pressure Switch
3
Input Status 155
R
2SHQ6ZLWFK
&ORVHG6ZLWFK
Primary Probe ECO Status
Input Status 156
R
2SHQ6ZLWFK
&ORVHG6ZLWFK
Flame Sensed
Input Status 228
R
1R)ODPH
)ODPH6HQVHG
0;L/RZ7HPSHUDWXUH
Input Status 237
R
7HPS2.
/RZ7HPS
'DWDLV9HUVLRQHQFRGHGLQWRWKHXSSHUELWVDQG5HYLVLRQ/RZHUELWV
7KLVOLPLWVPRGXODWLRQWRPD[LPXP(063HUFHQW&RPPDQGHG $OORZXSWRUDWHGILULQJIDVWHUUHFRYHU\ PLQLPXP
modulation rate more efficient but has a slower recovery rate i.e. derates heater capacity).
0;LRQO\'XHWRKDUGZDUHGHVLJQ0;LFDQQRWGHWHFWVZLWFKVWDWHZKHQLQIDXOWFRQGLWLRQDQGZLOOUHDG,QVWDQGE\DQ\VZLWFK
RIORZHULQWKHOLPLWVWULQJWKDQDQRSHQVZLWFKDERYHLWZLOODOVRDSSHDURSHQ/LPLWVWULQJRUGHULV/RZ*DV3UHVVXUH%ORFNHG
([KDXVW%ORFNHGLQWDNHDQG%ORZHUSURYH
'DWDVWRUHGLQWZRELWUHJLVWHUV³%LJ(QGLDQ´+LJKHURUGHUELWVLQORZHUUHJLVWHUQXPEHU
+RXUV DQG 'D\V XVHG WRJHWKHU GHULYHG IURP 7LPH KRXUV [ LH (ODSVHG 7LPH RI KRXUV LQ ³'D\V´ DQG
³+RXUV´ GD\VKRXUV
Summary of Contents for ETH-1000
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