Raypak 5042004 in. WC, STOP – Call the factory for directions, on what to do next, Model No

	with the blower suction within the tolerances spec-						CAUTION: Special manifold and air settings may
	ified in Table T, contact the factory. The reference						be required.
	amp draw reading may help to indicate if there is
	a problem with the system or if blower adjustment						Finishing
	is required.
	NOTE: Most commercially available amp probes					1.		Record all data on the “Start-up Checklist” located
	are not accurate enough and/or are not shielded well							at the back of this manual.
	enough to read accurately in the heater					2.		Disconnect the manometers and reconnect the
	environment. Blower amp draw readings are for
	reference only.							cap on the fan pressure switch tee and reinsert the
								sealing screws into the bleedle valves.
Manifold Check
						3.		Start-up is complete and the heater should be
1. Check manifold gas pressure at the gas valve out-								operating properly.
							Safety Inspection
	let pressure tap (connection “D” in Fig. 48). This
	pressure should read per the values in Table X for					1.		Check all thermostats and high limit settings.
	natural and propane gas.
2. If the pressure reading differs by more than ± 0.2						2.		During the following safety checks leave manome-
	in. WC, STOP – Call the factory for directions							ters hooked up, check and record.
	on what to do next!					3.		If other gas-fired appliances in the room are on the
	Model No.		Air Pressure		Setting			same gas main, check all pressures on the MVB
			Setting (in. WC)		Tolerance			with all other equipment running.
	504		-2.3		± 0.2 in. WC	4.		Check thermostats for ON-OFF operation.
	754		-2.9		± 0.2 in. WC
	1104		-4.0		± 0.2 in. WC	5.		Check high limits for ON-OFF operation.
	1504		-4.0		± 0.2 in. WC	6.		While in operation, check flow switch operation.
	2004		-4.1		± 0.2 in. WC
						7.		Check the low gas pressure switch (if provided).
	Table V:		MVB Air Pressure		Settings
					Setting			(For proper adjustment, use the attached
	Model No.		Amp Draw					manometers, if available, to set pressure. The
					Tolerance			scales on the switch are approximate only.) Low
	504	1.9		+0.0/-0.2
								gas pressure switch (if provided) must be set at
	754	2.9		+0.0/-0.2				3.0 in. WC for natural gas and propane gas.
	1104	5.5		+0.0/-0.2		8.		Make sure that the high gas pressure switch (op-
	1504	8.1		+0.0/-0.2
	2004	13.0		+0.0/-0.5				tional) is set to 3.0 in. WC for both natural gas and
								propane gas.
	Table W: MVB Amp Draw (Reference Only)
							Follow-Up
			Manifold Gas Pressure Setting
	Model No.		High Fire Values (in. WC)				Safety checks must be recorded as performed.
			Natural Gas		Propane Gas		Turn heater on. After main burner ignition:
	504		-0.1		-0.1	1.		Check manometer for proper readings.
	754		-0.4		-0.1
	1104		-1.0		-0.2	2.		Cycle heater several times and re-check readings.
	1504		-2.4		-0.6	3.		Remove all manometers and replace caps and
	2004		-1.0		-0.5			screws.
	Table X: MVB Manifold Pressure Settings					4.		Check for gas leaks one more time.
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