Manual

15
VII. System Start-up
Safe lighting and other performance criteria were met with the gas manifold and control assembly provided on the boiler when
the boiler underwent tests specied in American National Standard for Gas-Fired Low-Pressure Steam and Hot Water Boilers,
ANSI Z21.13.
A. Main Burner Check - Check main burners to see
that they were not dislodged during shipment. Rear
of burners should be in the vertical slots in the rear of
burner tray and the front of the burners should be seated
completely on the orices.
B. Initial start -
1. Fill entire heating system with water and vent
air from system. Use the following procedure on a
Series Loop System equipped with zone valves. (See
Figure 3).
a. Close isolation valve in boiler supply piping.
b. Isolate all circuits by closing zone valves or
balancing valves.
c. Attach a hose to hose bib located just below
isolation valve in boiler supply piping. (Note
- Terminate hose in ve gallon bucket, at a
suitable oor drain, or outdoor area).
d. Starting with one circuit, open zone valve.
e. Open hose bib.
f. Open ll valve (Make-up water line should be
located directly above isolation valve in boiler
supply piping).
g. Allow water to overow from bucket until
discharge from hose is bubble free for 30
seconds.
h. Open zone valve to the second zone to be
purged, then close the rst. Repeat this step until
all zones have been purged, but always have one
zone open. At completion, open all zone valves.
i. Close hose bib, continue lling the system
until the pressure gauge reads 12 psi. Close ll
valve. (Note - If make-up water line is equipped
with pressure reducing valve, system will
automatically ll to 12 psi. Leave globe valve
open).
j. Open isolation valve in boiler supply piping.
k. Remove hose from hose bib.
2. Turn ROOM THERMOSTAT to lowest setting.
3. Be sure that gas to pilot and main burners has been
off for at least ve minutes and vent damper has
been in the open position.
4. Turn "OFF" the electric switch serving boiler.
5. Open valve on main gas line at meter.
6. PURGE AIR FROM GAS PIPING. This procedure
will vary with ignition system furnished but in all
cases adequate ventilation must be provided and
no smoking or open ame permitted.
a. Standing Pilot Models, see Figures 6 and 16.
i. Keep electric switch "OFF".
ii. Open Manual Shut-off Valve upstream of
Combination Gas Valve.
iii. Disconnect Pilot Tubing at gas valve (Purge
must not be into combustion chamber).
iv. Turn Main Gas Knob on Combination Gas
Valve to "Pilot" Position. Depress and hold
in this position until purging is complete.
Turn Main Gas Knob to "off" position.
v. Reconnect pilot tubing and check pipe and
ttings from meter to combination Gas
Valve for leaks using soap solution or other
approved method.
b. Intermittent Ignition Models, see Figures 7 and
17.
i. Turn "ON" electric switch serving boiler.
ii. Open Manual Shut-off Valve upstream of
Combination Gas Valve.
iii. Loosen or remove Inlet Pressure Tap Plug in
Combination Gas Valve and when purging
is complete, tighten or replace plug. (See
Figure 14).
Figure 14: Top View of Honeywell Gas Valves
iv. Check pipe and ttings from meter to
Combination Gas Valve using soap solution
or other approved methods.
CAUTION
v. Test gas piping and connections between
Combination Gas Valve and manifold,
orices, and pilot piping for leaks after
boiler is operating. Use soap solution or
other approved method.