SER
VICE PR
OCEDURE
S
On-Demand Water Heater Service Handbook for 240, 340 & 540 Condensing Models • 47
Table 18.
Mode # Whole M
ulti
-Unit System informa
ti
on (#0)
Unit informa
tion
(#1 to #4)
1
Total system
fl
ow rate 0 to 999 (GPM)
Total opera
tion
time
0 to 999 (x 100 hours)
2
BTU requireme
n
t for
the
Multi-
System
0 to 999 (×kBTU/h)
ON/OFF cycles
0 to 999
(× 1,000 cycles)
3
Qua
ntity
of c
onnec
ted
water heaters
1 to 4
(units)
F
an
motor speed
0 to 999 (× 10 rpm)
4
Priority water heater
unit
1 to 4
(unit
#)
Inl
et temperature
32 to 212 (°F)
Over 212 °F = E5,
Under
32 °F = E0
5
Qua
ntity
of
opera
tional
water
heaters
0 to 4
(units)
Heat ex
chan
ger
temperature (540
(T
-H3)
model
only)
6
Set temperature
100 to 185 °F
Outlet temperature
7
Opera
tion
time
during
curre
n
t rota
tion
0 to 720
(min
utes)
A
ft
er 720, the
n
ext
rota
tion
occurs
Air
-Fuel
ra
tio
rod
curre
n
t
0 to 999
(μA)
8
ON/OFF cycles
during
curre
n
t rota
tion
0 to 100 (cycles)
A
ft
er 100, the
n
ext
rota
tion
occurs
Flow rate
0 to 999 (× 0.1 GPM)
9
N/A
Ene
rgiza
tion
time
of
the
unit
0 to 999 (× 100 hours)
10
I
n
tegra
ting
fl
ow of the
unit
0 to 999
(× 10,000 g
allons)
11
Error code history: displays the most rece
n
t
error code
12
Inl
et temperature of
the priority
unit
32 to 212 (°F)
Over 212 °F = E5,
Under
32 °F = E0
Error code history: displays the
2nd
most
rece
n
t error code
13
Outlet temperature of
the priority
unit
Error code history: displays the 3rd most
rece
n
t error code
14
N/A
Clears the memory
in
error code history*
15
I
n
tegra
ting
output of
the
unit
0 to 999 MBTU/h
16
Air
-
fuel ra
tio
stage
0 to 16,
normal
c
ondition=6
17
Exhaust temperature
(Indoor
models
only)
32 to 212 (°F)
Over 212 °F = E5,
Under
32 °F = E0
18
N/A
Mode Number Descriptions
