Munchkin Gas-Fired Hot Water Boiler manual Check for GAS Leaks, Purge AIR from Water System

GAS-FIRED BOILER Boiler Manual

PART 11. START-UP PREPARATION (CONTINUED)

	WARNING				one at a time, beginning with lowest
					floor. Close vent when water squirts out.
Eliminate all system leaks. Continual fresh					Repeat with remaining vents.
make-up water will reduce boiler life. Minerals				j.	Refill to correct pressure.
can build up in the heat exchanger, reducing
heat transfer, overheating heat exchanger, and				E. CHECK FOR GAS LEAKS
causing heat exchanger failure.
						WARNING
5. The system may have residual substances
				Before starting the boiler, and during initial
that could affect water chemistry. After the
system has been filled and leak tested, verify				operation, smell near the floor and around the
water pH and chlorine concentrations are				boiler for gas odorant or any unusual odor.
acceptable.				Remove boiler front door and smell interior of
				boiler enclosure. Do not proceed with startup if
		CAUTION		there is any indication of a gas leak. Repair any
				leak at once.
It is important that you purge the system of air
to avoid damage to the boiler.
						WARNING
D. PURGE AIR FROM WATER SYSTEM				Propane boilers only — Your propane supplier
1. Purge air from system:				mixes an odorant with the propane to make its
				presence detectable. In some instances, the
a.	Connect a hose to the purge valve and
				odorant can fade, and the gas may no longer
	route hose to an area where water can			have an odor. Before startup (and periodically
	drain and be seen.			thereafter), have the propane supplier verify the
b.	Close the boiler or system isolation valve			correct odorant level in the gas.
	between the purge valve and fill
	connection to the system.
				F. CHECK THERMOSTAT CIRCUIT(S)
c.	Close zone isolation valves.
			1. Disconnect the two external wires connected
d.	Open quick-fill valve on cold water make-
				to	the boiler		thermostat terminals (low
	up line.
				voltage terminal strip terminals 5 and 6).
e.	Open purge valve.
			2.	Connect		a voltmeter across these two
f.	One zone at a time, open the isolation
				incoming wires. Close each thermostat, zone
	valves. Allow water to run through the
				valve and relay in the external circuit one at
	zone, pushing out the air. Run until no
				a	time and check the voltmeter reading
	noticeable air flow is present. Close the
				across the incoming wires.
	zone isolation valves and proceed with
	the next zone. Follow this procedure until 3.			There should NEVER be a voltage reading.
	all zones are purged.		4. If a voltage does occur under any condition,
g.	Close the quick-fill water valve and purge
				check and correct the external wiring. (This is
	valve and	remove the hose. Open all
				a common problem when using 3-wire zone
	isolation	valves. Watch that system
				valves.)
	pressure rises to correct cold-fill
			5.	Once the external thermostat circuit wiring is
	pressure.
h.	After the	system has operated for a		checked		and	corrected if necessary,
				reconnect		the	external thermostat circuit
	while, eliminate any residual air by using
				wires to boiler			low voltage terminal strip
	the manual air vents located throughout
				Allow the boiler to cycle.
	the system.
i.	If purge valves are not installed in
	system, open manual air vents in system

52