Installation (Gas Line) |
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GAS CONNECTIONS | Pipe Sized For Length Of Run In Equivalent Feet | Table 1. | |||||||||||||||||
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GAS LINE INSTALLATIONS |
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| 1/2 in. | 3/4 in. | 1 in. | 1¼ in. | 1½ in. |
| 2 in. | ||||||||||
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Model |
| Nat | LP | Nat | LP | Nat | LP | Nat | LP | Nat |
| LP |
| Nat |
| LP | |||
Before installing the gas line, be sure to |
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200 |
| - | 20' | 30' | 80' | 125' | 250' | 450' | 600' | - |
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check which gas the heater has been |
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designed to burn. This is important | 250 |
| - | 10' | 20' | 50' | 70' | 150' | 250' | 500' | 600' |
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because different types of gas require | 300 |
| - | - | 10' | 30' | 50' | 100' | 200' | 350' | 400' | 600' |
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different gas pipe sizes. The rating plate | 400 |
| - | - | - | 10' | 20' | 60' | 100' | 150' | 200' | 450' |
| 400' |
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on the heater will indicate which gas the |
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heater is designed to burn. Table 1., shows which |
| REGULATED MANIFOLD PRESSURE TEST |
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size pipe is required for the distance from the gas |
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| 1. Attach the manometer to the heater jacket. |
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meter to the heater. The table is for natural gas at a |
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| 2. Shut off the main gas valve. |
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specific gravity of .65 and propane at a specific |
| 3. Remove 1/8 in. NPT plug on the outlet side of the |
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gravity of 1.5. |
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| valve and screw in the fitting from the manometer kit. | |||||||||||||||
When sizing gas lines, calculate three (3) additional |
| 4. Connect the manometer hose to the fitting. |
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| 5. Turn on the heater. |
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feet of straight pipe for every elbow used. |
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| 6. The manometer must read 4 in. WC for natural gas | ||||||||||||||||
When installing the gas line, avoid getting dirt, |
| or 11 in. WC for propane, while operating. |
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| 7. For adjustment, remove the Regulator Adjustment | ||||||||||||||||||
grease or other foreign material in the pipe as this |
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| Cap and using a screwdriver turn the screw clock- | ||||||||||||||||||
may cause damage to the gas valve, which may |
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| wise to increase - counterclockwise to decrease gas | ||||||||||||||||||
result in heater failure. |
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| pressure. |
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The gas meter should be checked to make sure that |
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| Regulator Adjustment Cap |
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it will supply enough gas to the heater and any other |
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| 1/8" NPT Plug |
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appliances that may be used on the same meter. |
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| (Inlet Press) |
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The gas line from the meter will usually be of a |
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larger size than the gas valve supplied with the |
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heater. Therefore a reduction of the connecting gas |
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| ON |
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pipe will be necessary. Make this reduction as close |
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to the heater as possible. |
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| OFF |
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The heater and any other gas appliances must be |
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| 1/8" NPT Plug |
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| Figure 10. |
| (Manifold Press) |
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disconnected from the gas supply piping system |
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during any pressure testing on that system, (greater |
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| CAUTION |
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that ½ PSIG). |
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| The use of Flexible Connectors (FLEX) is NOT |
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The heater and its gas connection must be leak |
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| recommended as they cause high gas pressure drops. | ||||||||||||||||||
tested before placing the heater in operation. Do not |
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use flame to test the gas line. Use soapy water or |
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another nonflammable method. |
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A manual main |
| MINIMAX NT STANDARD GAS PRESSURE REQUIREMENTS* | |||||||||||||||||
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externally to the heater. |
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| Natural |
| Propane | |||||||
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| Maximum inlet gas pressure | 10 in. WC |
| 14 in. WC | |||||||||||
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| Minimum inlet gas pressure | **5 in. WC |
| 12 in. WC | |||||||||||
WARNING |
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| Normal manifold pressure | 4 in. WC |
| 11 in. WC | |||||||||||||
Do not install the gas line union inside the heater |
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| *All Readings are taken with the heater fired. Any adjustments | ||||||||||||||||||
cabinet. This will void your warranty. |
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| or readings made with heater off will give incorrect readings. |
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| ** 6 in. WC for 400 model |
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P/N 472032 | Rev. A |