Raypak 503-2003 Electrical Power Connections, Model In. NPT 4 in. NPT 2 in. NPT, High Fire Values

Installations must follow these codes:

• National Electrical Code and any other national, state, provincial or local codes or regulations hav- ing jurisdiction.

	Model			1 in. NPT				1-1/4 in. NPT				1-1/2 in. NPT				2 in. NPT			2-1/2 in. NPT
	No.		N			P		N		P			N		P	N	P		N	P
503			15			35	65			150	130				360
753			5			15	65			100			75		180	250
1103							35			55			35		90	125	300		300
1253							15			25			25		60	85	225		200	300
1503							10			15			15		25	60	150		150	275
1753																45	110		115	230
2003																35	90		85	210
Natural Gas		– 1,000 BTU/ft3, 0.60 specific gravity at 0.5 in. WC pressure drop
Propane Gas – 2,500 BTU/ft3, 1.53 specific gravity at 0.6 in. WC pressure drop
								Table I: Maximum Equivalent Pipe Length
The gas valve pressure regulator on the heater is													• Safety wiring must be NEC Class 1.
nominally preset as noted in Table J.													• Heater must be electrically grounded as required
During normal operation, carbon dioxide should be 8.5														by the NEC.
													• In Canada, CSA C22. 1 C.E.C. Part 1.
to 9.0% at full fire for natural gas and between 9.5 and													The MVB 503-1503 heaters are wired for 120 VAC, 12
10.0% for propane gas. Carbon monoxide should be
‹100ppm.													amps while the MVB 1753 & 2003 heaters are wired
													for 120 VAC, 18 amps. Consult the wiring diagram
						Manifold Gas Pressure
	Model												shipped with the heater. Before starting the heater,
	No.					(High Fire Values)							check to ensure proper voltage to the heater and
													pump.
				Natural Gas				Propane Gas
													Boiler mounted pumps (up to					3⁄4 hp) get their power
	503				-0.1				-0.1
	753				-0.4				-0.1				supply directly from the boiler power supply (connec-
													tions in rear wiring box). Install a circuit breaker sized
	1003				-0.8				-0.2				sufficiently for both the heater and the pump. Pumps
	1253				-1.6				-0.2				larger than 3⁄4 hp must use a separate power supply
													and run the power through the optional pump contac-
	1503				-2.4				-0.6				tor which is located in the rear wiring box. Use
	1753				-0.4				-0.1				appropriately-sized wire as defined by NEC, CSA
													and/or local codes. All primary wiring should be 125%
	2003				-1.0				-0.5
	NOTE: Manifold			pressures should be				±0.2 in. WC.					of minimum rating.
													If any of the original wire as supplied with the heater
	Table J: Manifold Gas Pressure Settings
													must be replaced, it must be replaced with 105°C wire
CAUTION: For proper operation, no more than a
													or its equivalent.
30% drop in gas supply pressure from no-load to full-
load conditions						is acceptabl e.				Under	no		All high voltage wiring connections to the MVB heater
circumstances should the pressure be outside the													are made inside the rear wiring box as shown in Fig.
listed operational range.													18. Pump power should be taken from terminals 2
													(Com), 3 (GND) and 6 (Hot) – 3⁄4 hp and smaller ONLY.
Electrical Power Connections
													Power to the MVB heater should be connected to ter-
													minals 1, 2, and 3 as noted in Fig. 18. All low voltage
													wiring,		including	sensors,	interlocks, enable/disable,

and various options are wired into terminals 1–20 on the front wiring panel as noted in Fig. 18.

20