Raypak 503-2003 Electrical Power Connections, Field-ConnectedControllers, Check the Power Source

SECTION C: Installation

Model	Manifold Gas Pressure
	(High Fire Values)
No.
	Natural Gas	Propane Gas
503	-0.1	-0.1
753	-0.1	-0.1
1003	-0.2	-0.2
1253	-0.1	-0.1
1503	-0.4	-0.3
1753	0.4	0.4
2003	0.6	0.6

NOTE: Manifold pressures should be + 0.2” WC.

Table I: Manifold Gas Pressure Settings

During normal operation, carbon dioxide should be 8.0 to 9.0% at full fire for natural gas and between 9.0 and 10.0% for propane gas. Carbon monoxide should be ‹100ppm.

Electrical Power Connections

Installations must follow these codes:

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

•Safety wiring must be NEC Class 1.

•Heater must be electrically grounded as required by the NEC.

•In Canada, CSA C22. 1 C.E.C. Part 1.

The MVB 503-1503 heaters are wired for 120 VAC, 12 amps while the MVB 1753 & 2003 heaters are wired for 120 VAC, 18 amps. Consult the wiring diagram shipped with the heater. Before starting the heater, check to ensure proper voltage to the heater and pump.

Boiler mounted pumps (up to ¾ hp) get their power supply directly from the boiler power supply (connec- tions in rear wiring box). Install a circuit breaker sized sufficiently for both the heater and the pump. Pumps larger than ¾ hp must use a separate power supply and run the power through the optional pump contactor which is located in the rear wiring box (see Fig. 16). Use appropriately-sized wire as defined by NEC, CSA and/or local codes. All primary wiring should be 125% of minimum rating.

If any of the original wire as supplied with the heater must be replaced, it must be replaced with 105°C wire or its equivalent.

Fig. 16: Rear Wiring Box Electrical Connections

All field wiring connections to the MVB heater are made inside the rear wiring box as shown in Fig. 16. Pump power should be taken from terminals 2 (Com), 3 (GND) and 6 (Hot) – ¾ hp and smaller ONLY. Power to the MVB heater should be connected to ter- minals 1, 2, and 3 as noted in Fig. 16. Sensors, interlocks, Enable/disable, and various options are wired into terminals 1 – 12 as noted in Fig. 16.

Field-Connected Controllers

It is strongly recommended that all individually- powered control modules and the heater should be sup- plied from the same power source.

NOTICE: Field-supplied isolation relays should be installed when field-connected controllers are mounted more than 50 equivalent feet (18 Ga) from heater.

Check the Power Source

WARNING: Using a multi-meter, check the following voltages at the circuit breaker panel prior to connecting any equipment. Make sure proper polarity is followed and house ground is proven. (See Fig. 17.)

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