25
FUTERA FUSION INSTALLATION AND OPERATION INSTRUCTIONS
Required Gas Pressure
Provide gas supply pressure at inlet to boiler gas train as
follows:
LP
Nat
Minimum (in W.C.)
2
2
Maximum (in W.C.)
14
14
Measure pressure when the boiler is fi ring at full rate. Low
gas pressure could indicate undersized gas line or
insuffi cient gas supply.
“Static and operating gas pressure required at the gas
valve inlet is between 2" W.C. and 14" W.C. for natural gas
and 2" W.C. and 14" W.C. propane. If the gas pressure is
above this limit, a lock-up style regulator suitable for dead
end service such as an Equimeter or Fisher must be
installed to prevent increase (creep) of gas pressure when
the units are not operating. This pressure regulator
(supplied by others) may be installed at the service
entrance to each unit or a “master” regulator sized to
handle multiple units may be utilized. Consult local gas
utility or regulator manufacturer for recommendations to
meet specifi c job site requirements.”
Input Rate, Natural Gas
Gas appliances are rated based on sea level operation with
no adjustment required at elevations up to
2000 ft
,
610 m
.
At elevations above
2000 ft
,
610 m
input ratings should
be reduced by 4% for each
1000 ft
,
305 m
.
Check the input rate as follows:
1. Turn off all other gas appliances that use the same gas
meter as the boiler/water heater.
2. Call your gas supplier and ask for the heating value
of the gas.
3. Start the boiler/water heater and let it run for 15
minutes.
4. Using the gas meter and a stopwatch, clock the time
that it takes to burn
10 ft
3
,
0.28 m
3
of gas and divide
this time by 10.
5. Insert the heating value and the time, in seconds, into
the formula below.
6. Input = (heating value, Btu/hr)(3600)/(time, seconds)
7. If the computed rate deviates by more than 5% from
the rated input value of the unit, consult factory.
CAUTION: Never increase the input to the boiler/water
heater above that for which it is rated. Doing so can
cause premature failure of the boiler!
CONTROL DESCRIPTION
Low Water Cutoff
If the boiler is to be installed above radiation or if required
by other codes or regulations, install a low water cutoff in
appropriate piping. Wire the switch and any external
controls in series to the "Interlock" contacts in the junction
box (see the attached Connection Diagrams for details).
Ensure that the low water cutoff device(s) will function
properly.
Operating Control
The preferred control setting for potable hot water is
130°F
,
54°C
. The operating control should be set to the lowest
setting that will satisfy the consumer's needs.
WARNING: Setting the thermostat or operation
control too high can result in scalding resulting in
severe personal injury!
High Limit (Aquastat)
The high limit is located in the top control area of the boiler/
water heater. A remote capillary bulb is run to a well on
the outlet side of the supply header. The high limit can be
reset by depressing the red button.
The water heater high limit should be set a minimum of
20°F
,
11°C
higher than the operating control. Refer to the
HOT WATER SUPPLY section for the proper supply water
temperature.
Flow Switch
A fl ow switch is provided in the water outlet piping to
prevent the boiler/water heater from fi ring without adequate
water fl ow through the heat exchanger.
MPA STAGING CONTROL
This boiler control is mounted on the front panel of the
boiler/water heater. It utilizes various temperature sensors
to calculate boiler/water heater demand and adjust the
modulation as needed. Various features of the control can
be adjusted from the 3-button panel on the controller. To
change settings of the modulation controller, press and hold
all three buttons approximately 2 seconds until the “adjust”
screen appears, then release them. The modulating control
provides 4 modes of operation based on the requirements
of the system. Each mode is defi ned below.
At the rear of the controller, there is a single DIP switch.
This switch is factory set to provide a “lockout” with
minimum adjustment capabilities in the fi eld. However, for
experienced installers and operators, changing these
switch settings can offer many fi ne-tuning features. Please
consult the factory for assistance.
CAUTION: DO NOT change DIP switch or controller
settings unless you have completely read and
u n d e r s t o o d t h i s d o c u m e n t a n d t h e c o n t ro l
manufacturer’s instructions. Doing otherwise will lead
to improper modulating control.
