Part number 550-100-168/0516
85
4. Replace the flue inspection plug.
The condensate trap 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.
Final checks before starting boiler
❏
Read the instructions to adjust and set up the Control
module.
❏
Verify that the boiler model is set correctly in the Con-
trol, and that it displays correctly.
❏
Verify that the boiler and system are full of water and
all system components are correctly set for operation.
❏
Fill condensate trap with water (see above for proce-
dure).
❏
Verify electrical connections are correct and securely
attached.
❏
Inspect vent piping and air piping for signs of dete-
rioration from corrosion, physical damage or sagging.
Verify air piping and vent piping are intact and correctly
installed per this manual.
To start the boiler
1. Turn OFF the boiler ON/OFF switch.
2. Read and follow the Operating Instructions, Figure 75,
page 88.
3. The Control display will show installed sensors when
first powered. Make sure the right sensors are detected. If
not, determine the cause and correct before proceeding.
If boiler does not start correctly
1. Check for loose connections, blown fuse or service
switch off?
2. Is external limit control (if used) open? Is boiler water
temperature above 200 °F?
3. Is thermostat set below room temperature?
4. Is gas turned on at meter or boiler?
5. Is incoming gas pressure greater or less than required
on page 49 (natural gas) or (propane)?
6. Are parameters set correctly as per this manual?
7. Is the warm weather shutdown activated?
8. If none of the above corrects the problem, refer to
Troubleshooting, beginning on page 96.
❏
Check system and boiler
❏
Check water piping
1. Check system piping for leaks. If found, shut down boiler
and repair immediately. (See WARNING on page 83
regarding failure to repair leaks.)
2. Vent any remaining air from system using manual vents.
Air in the system will interfere with circulation and cause
heat distribution problems and noise.
Check for gas leaks
Before starting the boiler, and during initial opera-
tion, use a leak detector or 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 leak
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 adjust-
ment. 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)
1. Disconnect the two external wires connected to the boiler thermo-
stat terminals (see Field wiring, beginning on page 50 for terminal
locations).
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 when using 3-wire
zone valves.)
5. Once the external thermostat circuit wiring is checked and cor-
rected if necessary, reconnect the external thermostat circuit wires.
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. (See page 46 for component locations.)
2. Pour water into the top of the boiler’s 1” PVC condensate tee and
check for any leaks in the condensate drain line or fittings. Repair
any leaks.
Fill condensate trap with water
1. Remove boiler front door.
2. Remove the flue inspection plug (item 45, page 3).
3. Pour fresh water into the flue inspection opening until the con-
densate trap is full of water (water begins to flow out through
condensate drain tee).
SlimFit
®
Series 3
COMMERCIAL
CONDENSING
GAS
-
FIRED
WATER
BOILER
—
Boiler Manual
Startup — final checks
