![1 in. NPT](/images/new-backgrounds/35668/3566839x1.webp)
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| Model |
| 1 in. NPT |
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| 2 in. NPT |
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| No. |
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| N |
| P |
| N | P |
| N | P |
| N | P |
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| N |
| P | |||
| 504 |
| 15 |
| 35 |
| 65 | 150 | 150 | 360 |
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| 754 |
| 5 |
| 15 |
| 35 | 75 |
| 70 | 175 |
| 250 |
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| 1104 |
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| 15 | 35 |
| 35 | 75 |
| 100 | 250 |
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| 225 |
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| 1504 |
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| 10 | 20 |
| 20 | 45 |
| 60 | 150 |
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| 150 |
| 275 | |
| 2004 |
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| 35 | 85 |
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| 85 |
| 200 |
| Natural Gas | – 1,000 BTU/ft3, 0.60 specific gravity at 0.5 in. WC pressure drop |
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Propane Gas – 2,500 BTU/ft3, 1.53 specific gravity at 0.6 in. WC pressure drop |
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| Table I: Maximum Equivalent Pipe Length |
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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. |
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the combined load. |
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| • Safety wiring must be NEC Class 1. |
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The gas valve pressure regulator on the heater is | • Heater must be electrically grounded as required | ||||||||||||||||||||
| by the NEC. |
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nominally preset as noted in Table J. |
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| • In Canada, CSA C22. 1 C.E.C. Part 1. |
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During normal operation, carbon dioxide should be 8.5 | The MVB | ||||||||||||||||||||
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. |
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| with the heater. Before starting the heater, check to | |||||||||||
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| ensure proper voltage to the heater and pump. |
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| Model |
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| Manifold Gas Pressure |
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| Boiler mounted pumps (up to | 34 |
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| No. |
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| (High Fire Values) |
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| ⁄ hp) get their power | |||||||||||||
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| supply directly from the boiler power supply (connec- | |||||||||||
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| Natural Gas |
| Propane Gas | ||||||||||||||||
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| tions in rear wiring box). Install a circuit breaker sized | |||||||||||||||
| 504 |
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| sufficiently for both the heater and the pump. Pumps | ||||||||||||
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| larger than | 3⁄4 hp must use a separate power supply | ||||||||
| 754 |
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| and run the power through the optional pump contac- | |||||||||||||
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| tor which is located in the rear wiring box. Use | |||||||||
| 1104 |
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| 1504 |
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| and/or local codes. All primary wiring should be 125% | |||||||||||||
| 2004 |
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| of minimum rating. |
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| NOTE: Manifold pressures should be ±0.2 in. WC. |
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| If any of the original wire as supplied with the heater | |||||||||||||||||
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| 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. |
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| 30% drop in gas supply pressure from | 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. |
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| (Com), 3 (GND) and 6 (Hot) – 3⁄4 | hp and smaller ONLY. | ||||||||||||||
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| Power to the MVB heater should be connected to ter- | |||||||||
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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: |
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| and various options are wired into terminals | ||||||||||||||||||
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| the front wiring panel as noted in Fig. 18. |
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