Installation manual

PART 10. START-UP PROCEDURE (CONTINUED)
Settings when using a tank or pipe sensor
Parameter  t should be set to F for Fahrenheit
temperatures or C for Celcius temperatures
Parameter |dd| should be set to the desired tank
temperature. If you are using 0-10 volt control,
parameter |dd| should be set to the tank temper-
ature corresponding to a 10 volt input signal.
Parameters |sh| and |dh| should both be set to the
number of degrees below the desired tank tem-
perature that you want the MODCON VWH boil-
er(s) to start firing at.
Settings when using a mechanical tank or
pipe sensor
The mechanical sensor should be set to the
desired tank temperature
Parameter
 t should be set to F for Fahrenheit
temperatures or C for Celsius temperatures
Parameter |dd| should also be set to the desired
tank temperature.
Parameter |sh| should be set to the number of
degrees below the desired temperature that you
want the MODCON VWH boiler(s) to begin firing
at. This is useful if you desire a greater differen-
tial temperature than what is designed into the
mechanical control
Note: Parameter |dh| is not used when using a
mechanical tank or pipe sensor.
Note: When using a mechanical control on the
storage tank, it is recommend that the tempera-
ture set-point on the VWH boiler is set 5°F above
the setting of the mechanical control located on
the storage tank. The VWH will modulate its fir-
ing rated based on the supply temperature sen-
sor until the mechanical control temperature set
point is reached.
C. STATUS MENU
Installers are also able to check the current status
of the Munchkin parameters by pressing
{|S4/Reset|} key for 3 seconds. Once activated, the
display will show {|d1|} alternating value of the actu-
al outlet temperature. Actual values are displayed
for each function. To view the next value simply
press the {|S/4|} key to go to the next displayed
value. Listed below are the values which can be
displayed. These values cannot be changed. To
exit this menu, simply press {|S3/Program|} key to
resume normal operation.
Function Value
d1 — Actual Temperature from supply sensor
d1/ Actual Temperature from outlet sensor
d2/ Actual Temperature from inlet sensor
d3/ If using a standard mechanical control,
the control will display |0| for closed
and |1| for open. If the tank sensor is
connected to the SuperStor storage
tank, it will measure the actual
temperature
d4/nc (Not used)
d5/nc (Not used)
d6/ Actual Fan speed multiplied by 10
(example: If fan speed displayed is
410 RPM x 10 = 4100 actual fan speed)
d7/ Actual Ionization current read from
Flame Rectification probe
d8/ 0 (Not used)
d9/ Circulator pump |0| = Off |1| = On
d10/ |Co| – Established connection
|nc| – No bus communication
d11/ Storage tank setpoint
n
DANGER
Water temperature over 125
degrees F. can cause severe
burns instantly, or death from
scalds. Children, disabled, and
elderly are at highest risk of
being scalded. See instruction manual before
setting temperature at water heater. Feel water
before bathing or showering! Temperature
limiting valves are available.
Set Point Adjustment
Function Display
Default
Setting
Range of
Adjustment
Supply Sensor
Differential
sh 7° F 1–45° F
Temperature
Set Point
dd 119° F 80° F/185° F
Tank Sensor
Differential
dh 7° F 1–45° F
Measurement
Units
t
Fahrenheit
to Celcius
F or C
GAS-FIRED HOT WATER SUPPLY BOILER Boiler Manual
56