Dhw Tank Sensor; Method 1 Operation; Method 1 Post Purge Option - RBI Futera III Manual
Finned copper tube gas boilers & water heaters 500 to 4,000 btuh input
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Also See for Futera III:
- Installation and operating instructions manual (44 pages) ,
- Installation & operation manual (40 pages) ,
- Control manual (128 pages)
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5
Configuring for DHW applications
DHW tank sensor
❑
DHW tank temperature controlled directly
temperature sensor (10k thermistor) in tank connected to
DHW TEMPERATURE SENSOR input (J10B 1/2) —
see Figure 4, page 23 for location.
❑
Single or multiple boiler application
❑
Dedicated water heating or combined space heat-
ing and DHW
Method 1 operation
Method 1 regulates 1 or more boilers using three parameters
that are set in the DHW Setup menus — DHW SETPOINT
and DHW DIFF, and ADD BOILER DELAY.
DHW SETPOINT
(usually the maximum allowable temperature in the tank).
DHW DIFF
boilers (typically set at 5 °F for this method). NOTE that a nar-
row differential setting may cause frequent cycling.
OFF TEMP (= SETPOINT)
❑
All boilers are off when tank temperature is at or above SET-
POINT temperature.
ON TEMP (= SETPOINT minus DIFF)
❑
Boilers are brought on one at a time, and only when the tank
temperature is below ON TEMP.
❑
Boilers are added if temperature remains below ON TEMP.
The HeatNet control waits for the ADD BOILER DELAY
time between each boiler.
❑
When temperature reaches ON TEMP or above, no more
boilers are added.
OPERATING BAND
❑
Active boilers remain on until the temperature reaches the
SETPOINT.
Method 1 post purge option
When tank temperature reaches OFF TEMP, all active boilers
turn off. The master boiler DHW relay will remain on for the
POST PURGE time set in the DHW Setup menu.
DHW post purge allows dumping the residual heat in the boiler
to the DHW tank.
P/N HN-IOM-1 82-0331 Copyright 2009 Mestek, Inc.
Finned copper tube gas boilers & water heaters – Control manual
DHW Method 1 —
(on DHW Sensor terminals)
.
Limiting maximum boiler temperature when
applying for DHW applications —
boiler is to be used for domestic water heating,
jumper JPS1 must be clipped. This limits the
maximum water outlet temperature. Failure to
comply could result in overly hot water being
delivered to the system. See Figure 3, page 22 for
location of JPS1.
— This is the target tank water temperature
— This is the control range for firing the boiler or
— tank
Method 1 setup procedure
.
❑
Tank sensor
the tank. Wire the sensor to master boiler DHW SENSOR
terminals, J10B terminals 1/2 (Figure 4, page 23).
❑
Clip jumper JPS1
all boilers that will be used for DHW.
When the
❑
Header sensor
heating — Install a header sensor and wire it to the master
boiler HEADER SENSOR terminals, J10A terminals 7/8
(Figure 4, page 23).
❑
DHW pump
normally-open contact, DHW PUMP/AUX. STATUS ter-
minals, J13 terminals 9/10 (Figure 3, page 22).
❑
Master boiler setup
MESTIC HOT WATER menu.
a.
For DHW BOILER? enter NO (will be changed to
YES only after other parameters are set).
b.
Set the desired values for DHW SETPOINT, DHW
DIFF and ADD BOILER DELAY.
c.
Enter YES for USE SENSOR?
d.
For DHW PRIORITY?, select YES if the space heating
system pump is to be turned off during DHW heating.
Select NO if the space heating pump is to continue run-
ning during DHW.
e.
Select the desired POST PURGE time (how long the
DHW pump or valve will remain open after the boilers
have shut down). See previous WARNING regarding
pump post purge operation.
f.
DHW MASTER?
Dedicated DHW
control itself plus HeatNet member boilers.
Combined space heating/DHW
combined space heating/DHW systems. The master
boiler for a combined system will have a header sensor
connected for space heating. This will automatically
make it the master for both space heating and DHW.
g.
Go to DHW BOILER? and select YES. Note that, if
jumper JPS1 has not been cut, the display will show a
message to do so.
(continued)
Post purge will increase tank temperature
Adding additional heat to
above SETPOINT —
the DHW tank after the setpoint temperature is
reached will increase tank temperature ABOVE
setpoint. Ensure that this is acceptable. IF NOT,
then the pump post purge must be disabled (set
to zero).
— Install a 10k tank temperature sensor in
(see Figure 3, page 22 for location) on
— For
space heating/water
combined
— Wire the DHW pump relay or valve to the
— Navigate to the SETUP / DO-
— select YES so the master boiler will
— Select NO for
If DHW operation is to be handled by a single
member boiler of a multiple boiler system, install
necessary piping, including diverting valve if
needed, and set up the boiler' s control settings to
switch to DHW on call from the tank sensor.
17
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