Lochinvar 400-801 Check for gas leaks, Check thermostat circuits, Inspect/fill condensate system

7 Start-up

Outdoor Knight XL Installation & Operation Manual

Check for gas leaks

￿WARNING

Propane boilers only – Your propane supplier mixes an odorant with the propane

￿WARNING

￿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 top 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.

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.

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.

Check thermostat circuit(s)

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
	correct the external wiring. (This is a common problem

Figure 7-1Condensate Trap

RETAINING

SCREW

2” PVC CAP WITH

BLOCKED DRAIN SWITCH

PVC TEE ASSEMBLY (FACTORY SUPPLIED)

CONDENSATE FROM

HEAT EXCHANGER TO FLOOR

DRAIN

34

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. Allow the boiler to

cycle.

Inspect/fill condensate system

Inspect/check condensate lines and fittings

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

Fill condensate trap with water

1.Remove the PVC cap retaining screw from the PVC cap (FIG. 7-1).

2.Remove the 2 inch PVC cap with the switch located at the top of the trap (FIG. 7-1).

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

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

5.Replace the retaining screw.

￿WARNING The condensate trap (FIG. 7-1) 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.