Munchkin Gas-Fired Hot Water Circulating Heater Check for GAS Leaks, Purge AIR from Water System

GAS-FIRED HEATER Installation 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 heater 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 Munchkin Contender, and
that could affect water chemistry. After the
system has been filled and leak tested, verify				during initial operation, smell near the floor and
water pH and chlorine concentrations are				around the heater for gas odorant or any
acceptable.				unusual odor. Remove heater front door and
				smell interior of heater enclosure. Do not
		CAUTION		proceed with startup if 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 heater.
						WARNING
D. PURGE AIR FROM WATER SYSTEM				Propane heater 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 heater 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 heater		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 heater			low voltage terminal strip
	the manual air vents located throughout
				Allow the heater to cycle.
	the system.
i.	If purge valves are not installed in
	system, open manual air vents in system
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