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LP- 428 REV. 9.2.14

h. Disconnect the wires that are connected to the THERMOSTAT terminals of the customer connection board. Apply power to
the boiler. The display will show the temperature of the water in the boiler. Press the

▼ and

ENTER

keys simultaneously and

hold for 1 second. The display will read:

The central heating pump will come on. If you then press the

▲ key, the central heating pump will shut off. The display will

read:

The DHW pump will come on. If the boiler is set up as the cascade master and you press the

▲ key again, the DHW pump will

shut off. The display will read:

The system pump will come on. Use the ▲ and ▼ keys to toggle between running each pump in the system as required to
help bleed out all entrapped air. Some good indicators that air is removed include the absence of gurgling noises in the pipes
and pump operation becoming very quiet. Pressing ▲ and ▼ together at any time will return the boiler to normal operation.
i. After the system has operated for some time, eliminate any residual air by using the manual air vents located throughout the
system.
j. If purge valves are not installed in the system, open manual air vents in the system one at a time, beginning with the lowest
floor. Close vent when water squirts out. Repeat with remaining vents.
k. Refill to correct pressure.
k. Refill to correct pressure.

E. CHECK FOR GAS LEAKS

Before starting the boiler, and during initial operation, smell near the floor and around the boiler for gas odorant or any unusual odor.
Remove boiler front door and smell interior of boiler enclosure. Do not proceed with startup if there is any indication of a gas leak.
Repair any leaks at once.

PROPANE BOILERS ONLY

– Propane suppliers mix an odorant with the propane to make its presence detectable. In some instances,

the odorant can fade, and the gas may no longer have an odor. Before startup (and periodically thereafter), have the propane supplier
verify the correct odorant level in the gas.

F. CHECK THERMOSTAT CIRCUIT(S)

1. Disconnect the two external wires connected to the boiler thermostat terminals (low voltage terminal strip).

2. Connect a voltmeter across these two incoming wires with power applied to the thermostat circuits. Close each thermostat, zone
valve, and relay in the external circuit 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 reading does occur under any condition, check and correct the external wiring. (This is a common problem when using 3-
wire zone valves).

5. Once the external thermostat circuit wiring is checked and corrected if necessary, reconnect the external thermostat circuit wires to
boiler low voltage terminal strip. Allow the boiler to cycle.

G. CONDENSATE REMOVAL

1. The boiler is a high efficiency condensing boiler. Therefore, the unit has a condensate drain. Condensate fluid is nothing more than
water vapor, derived from combustion products, similar to that produced by an automobile when it is initially started.

Condensation is slightly acidic (typically with a pH of 3 to 5) and must be piped with the correct materials. Never pipe the condensate
using steel, copper, brass or other materials that will be subject to corrosion. Plastic PVC or CPVC pipe are the only approved
materials.