Lochinvar 51-211 Check for gas leaks, Check thermostat circuits, Inspect/fill condensate system

10 Start-up

Check for gas leaks

Installation & Operation Manual

Check thermostat circuit(s)

￿WARNING

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

1.	Disconnect the two external wires connected to each of the
	heat/loop demand terminals on the connection board.
2.	Connect a voltmeter across these two incoming wires.
	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 does occur under any condition, check and

￿WARNING

DO NOT adjust gas valve outlet pressure. The gas valve is factory set for the correct outlet pressure. This setting is suitable for natural gas and propane, requiring no field adjustment. Attempting to alter the gas valve outlet pressure could result in damage to the valve, causing potential severe personal injury, death, or substantial property damage.

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 the connection board.

Inspect/fill condensate system

Inspect/check condensate lines and fittings

Figure 10-1Condensate Trap

1.Inspect the condensate drain line, condensate PVC fittings and condensate trap.

Fill condensate trap with water

￿WARNING

Propane boilers only – Your propane supplier mixes 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.

1.Remove the bezel as depicted in FIG. 8-1 on page 52 of this manual.

2.Remove the PVC cap retaining screw from the PVC cap (FIG. 10-1).

3.Remove the 2 inch PVC cap with the switch located at the top of the trap (FIG. 10-1).

4.Fill with fresh water until the water begins to pour out of the drain.

5.Replace the cap. Press the cap onto the trap until the cap makes contact with the drain.

6.Replace the retaining screw.

7.Reinstall bezel.

￿WARNING The condensate trap (FIG. 10-1) must be filled with water during all times of boiler

operation to avoid flue gas emission from the condensate drain line. Failure to fill the trap could result in severe personal injury or death.

Clean/Inspect Trap Assembly

58

1.Remove the clean out cap on the bottom of the trap. Let the condensate and any debris drain out.

2.Refill the trap according to the instructions above.