Startup - Weil-McLain Aqua Balance WMB-155 Manual

W
TM
AquaBalance

29 Startup

CIRCULATOR EXERCISING and
FREEZE PROTECTION
CIRCULATOR EXERCISING
The control will automatically start the circulator output and run
for 10 seconds for each 72-hour period of inactivity.
FREEZE PROTECTION
This function automatically fires the boiler and starts the
HEAT circulator when the heat exchanger sensor detects a
temperature less than 40 °F. The circulator turns off when the
temperature rises above 45 °F.
Clean system to remove sediment
1. You must thoroughly flush the system (without boiler
connected) to remove sediment. The high-efficiency heat
exchanger can be damaged by buildup or corrosion due
to sediment.
If the system needs to be cleaned, use only Sen-
tinel X400 cleaner, available from Weil-McLain.
See Figure 159, page 117 for information. Follow
instructions supplied with the X400 cleaner and
cleaning instructions on page 111. For zoned
systems, flush each zone separately through a
purge valve. (If purge valves and isolation valves
are not already installed, install them to properly
clean the system).
2. Flush system until water runs clean and you are sure piping
is free of sediment.
Do not use petroleum-based clean-
ing or sealing compounds in boil-
er system. Damage to elastomer seals
and gaskets in system could occur, re-
sulting in substantial property damage.
Before filling the boiler and system with water,
verify the following. Boiler corrosion can occur.
Failure to comply could result in boiler
failure or unreliable operation.
Water chemistry
Water pH between 7.0 and 8.5
1. Maintain boiler water pH between 7.0 and 8.5. Check with
litmus paper or have chemically analyzed by water treat-
ment company.
2. If pH differs from above, consult local water treatment
company for treatment needed.
70
M -
ALL OUNT GAS FIRED WATER BOILER
—
Boiler Manual
Hardness less than 7 grains
1. Consult local water treatment companies for unusually hard
water areas (above 7 grains hardness).
Chloride concentration must be
LESS THAN 50 ppm
1. Filling with chlorinated fresh water should be acceptable since
drinking water chloride levels are typically less than 5 ppm.
2. Do not use the boiler to directly heat swimming pool or spa
water.
3. Do not fill boiler or operate with water containing chloride
in excess of 50 ppm.
Verify that the water chemistry meets the limita-
tions and requirements of all other equipment in
the system.
Antifreeze
1. Use only antifreeze listed by Weil-McLain as suitable for
use with Combi boilers. See Figure 159, page 117 for infor-
mation.
2. See Replacement parts at the end of this manual for
part numbers to obtain antifreeze through a Weil-McLain
distributor.
Use the correct amount of antifreeze
1. Determine the freezing temperature needed (to protect
against lowest likely temperature the system water will en-
counter).
2. Find the antifreeze concentration by volume needed for this
temperature from the antifreeze manufacturer's data on the
antifreeze container.
3. Add up the volume (gallons) of all system piping and com-
ponents, including the expansion tank and boiler.
a. Boiler water content is listed in Figure 172, page 130.
b. Remember to include expansion tank water content.
4. Multiply this volume by the (percent) antifreeze needed to
find the number of gallons of antifreeze to add.
Fill and test water system
1. Fill system only after ensuring the water meets the require-
ments of this manual.
2. Close manual and automatic air vents and boiler drain valve.
3. Fill to correct system pressure. Correct pressure will vary
with each application.
a. Typical cold water for a residential system is 12 psi mini-
mum fill pressure.
Boiler water pressure switch is set for 9 psi (±2)
minimum pressure. A low water pressure will give
"F37" fault code.
b. Pressure will rise when boiler is turned on and system
water temperature increases. Operating pressure must
never exceed 25 PSIG.
4. At initial fill and during boiler startup and testing, check
system thoroughly for any leaks. Repair all leaks before pro-
ceeding further.
Part number 550-100-305/0118