Start-up – Lochinvar KNIGHT 800 User Manual

Page 51

Installation & Operation Manual

Start-up

(continued)

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 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 or attempt to measure 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 or measure the gas
valve outlet pressure could result in
damage to the valve, causing potential
severe personal injury, death, or
substantial property damage.

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.

Check thermostat circuit(s)

Disconnect the two external wires connected to the room
thermostat terminals on the connection board.

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.

There should NEVER be a voltage reading.

If a voltage does occur under any condition, check and
correct the external wiring. (This is a common problem
when using 3-wire zone valves.)

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

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

Fill condensate trap with water

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

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

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

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

Replace the retaining screw.

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.

PVC TEE ASSEMBLY

(FACTORY SUPPLIED)

TO FLOOR

DRAIN

2” PVC CAP WITH

BLOCKED DRAIN SWITCH

RETAINING

SCREW

CONDENSATE FROM

HEAT EXCHANGER

Figure 10-1 Condensate Trap

ƽ WARNING