Specifications

Part number 550-100-090/0809
33
g a s -f i r e d w a t e r b o i l e r — Boiler Manual
BASIC INSTALLATION
Startup — final checks
Check thermostat circuit(s)
Disconnect the two external wires connected to 1.
the boiler thermostat terminals (see Field wiring,
beginning on page 26 for terminal locations).
Connect a voltmeter across these two incoming 2.
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.3.
If a voltage does occur under any condition, check 4.
and correct the external wiring. (This is a common
problem when using 3-wire zone valves.)
Once the external thermostat circuit wiring is 5.
checked and corrected if necessary, reconnect the
external thermostat circuit wires. Allow the boiler
to cycle.
Inspect/fill condensate system
Inspect/check condensate lines and
fittings
Inspect the condensate drain line, condensate PVC 1.
fittings and condensate trap. (See page 23 for com-
ponent locations.)
Pour water into the top of the boiler’s ½” PVC 2.
condensate tee and check for any leaks in the con-
densate drain line or fittings. Repair any leaks.
Fill condensate trap with water
Loosen the hose clamp securing the right end of 1.
the condensate trap to the PVC reducing elbow
(see page 23 for details).
Slide the trap hose end off of the elbow.2.
Fill the trap with fresh water to within an inch of 3.
the end of the hose.
Replace trap hose on PVC reducing elbow and 4.
tighten the hose clamp.
The condensate trap must be filled with
water during all times of boiler operation
to avoid flue gas emission from the con-
densate drain line. [Prime the condensate
trap (by pouring water into the outlet
tee while restricting flow in drain tube)
if boiler has been out of service for an
extended period.] 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 U-

Control module.
Verify that the boiler model is set correctly in the

U-Control, 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 vent condensate trap with water (by remov-

ing hose clamp and hose at PVC reducing elbow).
Replace hose on PVC reducing elbow and tighten
clamp.
Verify electrical connections are correct and se-

curely attached.
Inspect vent piping and air piping for signs of
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deterioration from corrosion, physical damage or
sagging. Verify air piping and vent piping are intact
and correctly installed per this manual.
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.