Check Thermostat Circuits - Weil-McLain Aqua Balance WMB-155 Manual

W
TM
AquaBalance
29 Startup
(continued)
Use of X100 inhibitor is REQUIRED
1. The boiler is shipped with Sentinel X100 inhibitor and Senti-
nel X100 Quick Test Kit. See Repair Parts Figure 159, page 117
for re-ordering information.
2. After filling the system as directed in this manual, and the air
purge has been completed, release the system water pressure
to 0 psi. Drain a small amount of water out of a convenient
boiler drain to insure the system water pressure is at 0 psi. Use
a (field supplied) Dishwasher elbow / hose 3/4 to 3/8 com-
pression adapter (See Figure 97 below) to the white Sentinel
hose, and screw it to the tube of Sentinel X100. Insert it into
your caulk gun, and fit the washing machine hose adapter
to a boiler drain connection. Open the drain, and inject the
complete tube of X100 to the system. Close the drain valve,
and remove the injection fitting.
Figure 97 Hardware fittings to add Sentinel to boiler
3. Fill system water to required pressure, and start a heating zone
to circulate system water. Allow time for the water to circulate
and mix. Then check the inhibitor level with supplied test kit.
Add additional inhibitor if necessary.
Check/verify water chemistry
1. The system may have residual substances that could affect
water chemistry.
2. After the system has been filled and leak tested, verify water
pH and chloride concentrations are acceptable.
3. Verify antifreeze concentration, if used.
4. Follow the instructions on the Sentinel test kit to sample the
system water and verify inhibitor concentration.
72
M -
ALL OUNT GAS FIRED WATER BOILER
—
Boiler Manual
Check inhibitor concentration
annually
1. Test the pH of a sample of system water at least annually.
The pH of the water mixture must be between 7.0 and 8.5.
(Or use the Sentinel inhibitor test kit to check concentra-
tion.)
2. If pH is outside this range (or inhibitor test kit indicates
low level), the inhibitor level may not be sufficient to pre-
vent corrosion.
3. Test antifreeze concentration.
Test antifreeze concentration at least annually.
If concentration is low, add antifreeze or drain
system and refill with correct mixture.
4. Follow instructions on antifreeze container to determine
the amount of antifreeze needed.
volume concentration of antifreeze.
Check inhibitor level after adjustments are made.

Check thermostat circuits

1. Disconnect wires connected to the thermostat terminals
(see Field wiring, beginning on page 50 for low voltage
terminal locations and application information). Mark
the wires before removing to avoid wiring errors when
re-connecting them.
2. Connect a voltmeter across each pair of incoming wires.
Close each thermostat, zone valve and relay in the external
circuits one at a time and check the voltmeter reading across
the incoming wires.
3.
There should NEVER be a voltage reading.
4. If a voltage does occur under any condition, check and
correct the external wiring.
DO NOT connect the thermostat terminals
to 3-wire zone valves
trol damage.
5. Once the external thermostat circuit wiring is checked and
corrected if necessary, reconnect the external thermostat
circuit wires.
DO NOT exceed 50% by
. This could cause con-
Part number 550-100-305/0118