lp-441 Rev. 002 Rel. 008 Date 8.23.18
35
Resistance Table for Supply Temperature Sensor
High / Low Temp Sensor Temp. (
o
F)
Resistance (Ohms)
32
32550
41
25340
50
19870
59
15700
68
12490
77
10000
86
8059
95
6535
104
5330
113
4372
122
3605
131
2989
140
2490
149
2084
158
1753
167
1481
176
1256
185
1070
194
915
202
786
212
667
Table 17 - Supply Temperature Resistance Sensor
B. Test Mode
Test Mode is enabled by pressing
or
together for 5 seconds.
In this mode the water heater operates without modulation, and the
combustion system initially runs at the maximum fan speed. The
SERVICE symbol is displayed on the LCD when Test Mode is active.
Test Mode can be used to incrementally increase and decrease
fan speed to test the combustion system. See the tables below for
Combustion Settings and Fan Speeds.
1. Use the
or
buttons to decrease or increase the fan
speed in increments of 50 rpm.
2. Press
to advance directly to the maximum fan speed.
3. Press
to go directly to the minimum fan speed.
4. Range between minimum and maximum fan speed is taken as an
absolute power value (0 - 100%).
5. During Test Mode, the LCD flame symbols are enabled as follows:
Flame ON and power < 30% - - 1/3 flame symbol
Flame ON and power > 30% and <75% - - 2/3 flame symbol
Flame ON and power > 75% - - full flame symbol
6. Burner ON and OFF conditions are:
Burner ON: UPPER temperature < 185
o
C
Burner OFF: UPPER temperature ≥ 194
o
C
7. Test Mode can be enabled for a maximum of 15 minutes.
8. Test Mode can be disabled by pressing
.
Combustion Settings on All Models
Fan Speed
Natural Gas (NG)
Propane (LP)
Low Ignition High Low Ignition High
Carbon Monoxide
(CO) PPM
1-10
2-15
2-20 1-10
2-15
2-20
Carbon Dioxide
(CO2) %
8-10
8 1/2- 10 1/2
9-11
Table 18 - Combustion Settings - All Models
Fan Speeds
Fuel
Ignition
Min
Max
Natural Gas
5000
2150
6300
Propane
3800
2100
Table 19 - Fan Speeds
4. Adjust the temperature set point of the heater to the desired level.
The factory default setting is 120
o
F. If changes are necessary, follow
“Basic Control Functions” in this manual.
5. If the water heater fails to start, refer to the Troubleshooting
section in the back of this manual.
C. Maintenance
The control system requires no periodic maintenance under normal
conditions. However, in unusually dirty or dusty conditions, periodic
vacuuming of the cover to maintain visibility of the display and
indicators is recommended. In dirty environments, such as construction
sites, care must be taken to keep the water heater burner cover in place
and drywall or saw dust away from water heater.
In unusually dirty or dusty conditions care must be taken to keep
water heater burner door in place. Failure to do so VOIDS warranty.
It is very important that the combustion system be set within the
recommended CO measurements listed below. Visually looking
at the burner does not determine combustion quality. Failure to
measure combustion with a calibrated Combustion Analyzer and
set the throttle within the recommended CO measurements could
result in property damage, severe personal injury, or death.
