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Series MI/MIH
Gas Boilers
Installation,
Operation &
Maintenance
Manual
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TABLE OF CONTENTS TABLE OF CONTENTS A. COMPLETING THE INSTALLATION . . . . . . .21 USING THIS MANUAL 1 B. CONTROL DESCRIPTIONS . . . . . . . . . . . . .25 A. INSTALLATION SEQUENCE . . . . . . . . . . . . .1 C. ADJUSTMENT OF GAS PRESSURE B. SPECIAL ATTENTION BOXES . . . . . . . . . . . .1 REGULATOR . . . . . . . . . . . . . . . . . . . . . . . . .25 1. PREINSTALLATION 2 D. ADJUSTMENT OF PILOT GAS FLOW . . . . .25 E. CHECKING BURNER INPUT . . . . . . . . . . . . .26 A. ACCESSIBILITY CLEARANCES . .
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USING THIS MANUAL USING THIS MANUAL A. INSTALLATION SEQUENCE DANGER Follow the installation instructions provided in this Indicates a condition or hazard which will cause manual in the order shown. The order of these severe personal injury, death or major property instructions has been set in order to provide the installer damage. with a logical sequence of steps that will minimize potential interferences and maximize safety during boiler installation. WARNING B. SPECIAL ATTENTION BOXES Indicate
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PREINSTALLATION 1. PREINSTALLATION Read carefully, study these instructions before beginning work. This boiler must be installed by a qualified contractor. The boiler warranty can be voided if the boiler is not installed, maintained and serviced correctly. NOTICE The equipment must be installed in accordance with those installation requirements of the authority having jurisdiction or, in the absence of such requirements, to the current edition of the National Fuel Gas Code, ANSI Z223.1/NFPA 54
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PREINSTALLATION where: I = Input of appliances other than fan other assisted in Btu/hr ACH = air change per hour (percent of the volume of the space exchanged per hour, expressed as a decimal) For fan assisted appliances, calculate the required volume of air using the following equation: ⎝ 3 ⎛ 15 ft I fan ⎜ Required Volume = ⎜ fan ⎛ Btu ACH 1000 / ⎝ hr I = Input of the fan assisted appliances in fan Btu/hr Note: These calculations are not to be used for infiltration rates greater than 0.60 ACH.
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PREINSTALLATION Figure 1.4: Air Openings – All Air from Outdoors through Vertical Ducts Figure 1.6: Air Openings – All Air from Outdoors through One Opening ii. Where communicating with the outdoors through horizontal ducts, each opening shall 5. Combination Indoor and Outdoor Combustion Air: 2 have a minimum free area of 1 in per 2000 If the required volume of indoor air exceeds the 2 Btu/hr (22 cm per 2000 W) of total rated available indoor air volume, outdoor air openings or input for all app
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PREINSTALLATION c. Each of the appliances served shall be e. Ducts shall not be screened where terminating in interlocked to the mechanical air supply to an attic space. prevent main burner operation when the mechanical air supply system is not in operation. f. Horizontal upper combustion air ducts shall not slope downward toward the source of the d. In buildings where the combustion air is provided combustion air. by the mechanical ventilation system, the system shall provide the specified comb
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BOILER SET-UP 2. BOILER SET-UP 1. Provide a sound, level foundation. Locate boiler as 4. Separate the wood shipping pallet from the boiler near to the chimney or outside wall as possible and base by removing two (2) hold-down bolts at each centralized with respect to the heating system. end of the boiler base. 2. Locate boiler in front of installation position before 5. Move boiler into final position. If using combustible removing crate. floor pan, install boiler on pan as outlined in the instr
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WATER PIPING AND CONTROLS 3. WATER PIPING AND CONTROLS 3. Supply Piping: A. BOILER SUPPLY AND RETURN Pipe the supply to the 1-1/2 NPT supply tapping at the top and rear of the boiler. 1. Size the supply and return to suit the system. A typical piping arrangement is shown in Figure 3.1. 4. When system return water temperature will be below Refer also to the I=B=R Guide - Residential 130°F (54°C), pipe the boiler with a bypass Hydronic Heating Installation/Design and the PB arrangement to blend th
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WATER PIPING AND CONTROLS 6. Install this boiler so that the gas ignition system components are protected from water (dripping, spraying, etc.) during appliance operation and service (circulator replacement, condensate trap, control replacements, etc.). 7. If this boiler and distribution system is used in conjunction with a refrigeration system, pipe the chilled medium in parallel with the boiler and install the proper valve to prevent the chilled medium from entering the boiler. A drawing illus
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WATER PIPING AND CONTROLS C. PIPING FOR ZONED SYSTEMS 1. See Figures 3.5 and 3.6 for basic zoned system layouts. 2. Run each zone pipe down then up to zone to prevent air accumulation in piping. 3. If required, provide means to isolate and drain each zone separately. Figure 3.5: Zone Piping with Zone Valves Figure 3.6: Zone Piping with Circulators 9
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WATER PIPING AND CONTROLS D. EXPANSION TANK F. FREEZE PROTECTION For new or existing systems that must be freeze- 1. Consult the tank manufacturer’s instructions for protected: specific information relating to tank installation. Size the expansion tank for the required system volume WARNING and capacity. See Table 10.2 in Section 10 for boiler water content. Use only inhibited propylene glycol solutions of up to 2. Expansion tanks are available with built-in fill valves 50% by volume with water.
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VENTING 4. VENTING A. INTEGRAL DRAFT HOOD B. VENT DAMPER INSTALLATION – GENERAL 1. The MI/MIH boiler is equipped with a built-in draft hood. This device is designed to: 1. Do not use one vent damper to control two or more heating appliances. See Figure 4.1. a. provide for the ready escape of flue gases from the boiler in the event of no draft. 2. Follow these and the installation instructions that are included with the vent damper. Observe the cautions b. prevent a backdraft from entering the bo
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VENTING 4. Before connection of joints, inspect the vent pipe C. VENT PIPING AND CHIMNEY interior for foreign objects such as tools, equipment, rags, etc. and remove if present. 1. Install vent piping in accordance with Venting of Equipment part of the National Fuel Gas Code, ANSI 5. Insert vent pipe into but not beyond the inside wall Z223.1/NFPA 54, sections 7.2, 7.3 or 7.4 of of the chimney flue. CAN/CSA B149.1, Natural Gas and Propane Installation Code, or applicable provisions of the 6. Do
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VENTING d. Place in operation the appliance being inspected. D. BOILER REMOVAL FROM COMMON Follow the lighting instructions. Adjust thermostat so VENTING SYSTEM appliance will operate continuously. At the time of removal of an existing boiler, follow these e. Test for spillage at the draft hood relief opening after steps with each appliance remaining connected to the 5 minutes of main burner operation. Use the flame common venting system placed in operation, while the of a match or candle, or sm
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GAS PIPING 5. GAS PIPING 1. Size and install the gas supply piping properly in order to provide a supply of gas sufficient to meet the maximum demand without undue loss of pressure between the meter and the boiler. 2. Determine the volume of gas to be provided to the boiler in cubic feet per hour. To obtain this value, divide the Btu per hour rating (on the boiler rating plate) by the heating value of the gas in Btu per cubic feet. Obtain the heating value of the gas from the gas supplier. As an
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GAS PIPING Table 5.1: MI Boiler – Natural Gas Input Model Cubic Feet / Hour Cubic Meters / Hour MI-03 70 2.0 MI-04 105 3.0 MI-05 140 4.0 MI-06 175 5.0 MI-07 195 5.5 MI-08 227.5 6.4 MI-09 260 7.4 Table 5.2: MI Boiler – LP Gas Input Model Cubic Feet / Hour Cubic Meters / Hour MI-03 28 0.8 MI-04 42 1.2 MI-05 56 1.6 MI-06 70 2.0 MI-07 78 2.2 MI-08 91 2.6 MI-09 104 2.9 Table 5.3: MIH Boiler – Natural Gas Input Model Cubic Feet / Hour Cubic Meters / Hour MIH-03 65 1.8 MIH-04 97.5 2.8 MIH-05 130 3.7 MI
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ELECTRICAL 6. ELECTRICAL Install all electrical wiring in accordance with the National Electrical Code and local requirements. NOTICE This unit when installed must be electrically grounded in accordance with the requirements of the authority having jurisdiction or, in the absence of such requirements, with the current edition of the National Electrical Code, ANSI/NFPA 70 and/or the Canadian Electrical Code, Part 1 CSA C22.1, Electrical Code. A. WIRING C. CONTROLS 1. See Figure 6.1 for location o
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ELECTRICAL Figure 6.2: Wiring and Connection Diagram – Standing Pilot (Continuous Ignition) Pilot flame is monitored through the pilot D. SEQUENCE OF OPERATION thermocouple. If pilot flame is lost during a call for heat, main and pilot gas flow will be shut off. 1. Standing Pilot (See Figure 6.2 above) The valve must then be manually reset by a. The vent damper is continuously powered. On a following the Lighting Instructions mounted on call for heat, limit relay R is energized, which the jacket
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ELECTRICAL Figure 6.3: Wiring and Connection Diagram – Intermittent Ignition ● the blocked vent switch is closed, and 2. Intermittent Ignition (see Figure 6.3 above) ● the flame rollout switch is closed. a. The vent damper is continuously powered. On a call for heat, limit relay R is energized, which c. When the call for heat ends: energizes: ● Limit relay R de-energizes, which opens contacts R1 and R2. ● the circulator (when used) through contact R1, and ● The circulator shuts down. ● the vent
