Raypak 5042004 Electrical Power Connections, Model In. NPT 4 in. NPT 2 in. NPT, High Fire Values

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

504

15

35

65

150

150

360

754

5

15

35

75

70

175

250

1104

15

35

35

75

100

250

225

1504

10

20

20

45

60

150

150

275

2004

35

85

85

200

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

When connecting additional gas utilization equipment

• National Electrical Code and any other national,

to the gas piping system, the existing piping must be

state, provincial or local codes or regulations hav-

checked to determine if it has adequate capacity for

ing jurisdiction.

the combined load.

• Safety wiring must be NEC Class 1.

The gas valve pressure regulator on the heater is

• Heater must be electrically grounded as required

by the NEC.

nominally preset as noted in Table J.

• In Canada, CSA C22. 1 C.E.C. Part 1.

During normal operation, carbon dioxide should be 8.5

The MVB 504-1504 heaters are wired for 120 VAC, 12

to 9.0% at full fire for natural gas and between 9.5 and

amps while the MVB 2004 heaters are wired for 120

10.0% for propane gas. Carbon monoxide should be

VAC, 18 amps. Consult the wiring diagram shipped

‹100ppm.

with the heater. Before starting the heater, check to

ensure proper voltage to the heater and pump.

Model

Manifold Gas Pressure

Boiler mounted pumps (up to

34

No.

(High Fire Values)

⁄ hp) get their power

supply directly from the boiler power supply (connec-

Natural Gas

Propane Gas

tions in rear wiring box). Install a circuit breaker sized

504

-0.1

-0.1

sufficiently for both the heater and the pump. Pumps

larger than

3⁄4 hp must use a separate power supply

754

-0.4

-0.1

and run the power through the optional pump contac-

tor which is located in the rear wiring box. Use

1104

-1.0

-0.2

appropriately-sized wire as defined by NEC, CSA

1504

-2.4

-0.6

and/or local codes. All primary wiring should be 125%

2004

-1.0

-0.5

of minimum rating.

NOTE: Manifold pressures should be ±0.2 in. WC.

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-

All high voltage wiring connections to the MVB heater

load conditions

is acceptabl e.

Under

no

are made inside the rear wiring box as shown in Fig.

circumstances should the pressure be outside the

18.

Pump power should be taken from terminals 2

listed operational range.

(Com), 3 (GND) and 6 (Hot) – 3⁄4

hp and smaller ONLY.

Power to the MVB heater should be connected to ter-

Electrical Power Connections

minals 1, 2, and 3 as noted in Fig. 18. All low voltage

wiring, including sensors, interlocks, enable/disable,

Installations must follow these codes:

and various options are wired into terminals 1–20 on

the front wiring panel as noted in Fig. 18.

20