Munchkin Gas-Fired Hot Water Boiler User Manual

WARNING

This manual must only be used by a qualified heating installer/service technician. Read all instructions in this manual before installing. Perform steps in the order given. Failure to comply could result in severe personal injury, death or substantial property damage.

• Installation

• Startup

• Maintenance

• Parts

Boiler

Manual

GAS-FIRED BOILER Boiler Manual

CONTENTS

Part 1 – Product and Safety Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3, 4

Part 2 – How The Boiler Operates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-9

Part 3 – Prepare Boiler Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-12

A. Boiler Location Should Be Level B. Installations Must Comply With: C. Before Locating Boiler D. Clearances for Service Access E. Residential Garage Installation F. Exhaust Vent and Intake Air Vent G. Prevent Combustion Air Contamination H. When Removing a Boiler from an Existing Common Vent System

Part 4 – Prepare Boiler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

A. Remove Boiler from Box

Part 5 – Boiler Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-24

– Boiler Piping Details . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18-24

A. Relief Valve B. General Piping Information C. Separate Low Water Cutoff D. Backflow Preventer E. System Water Piping Methods F. Circulators G. Hydronic Piping with Circulators, Zone Valves and Multiple Boilers H. Circulator Sizing I. Fill and Purge Heating System J. Zoning with Zone Valves K. Zoning with Circulators L. Multiple Boilers M. Boiler Piping Details

Part 6 – Boiler Piping with Vision 1 System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

– Boiler Piping Details With Vision I System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26-35

A. Vision 1 System Piping B. Zoning with Zone Valves Using Vision I C. Zoning with Circulators Using Vision I D. Boiler Piping Details with the Vision I System

Part 7 – Venting Combustion Air And Condensate Removal. . . . . . . . . . . . . . . . . . . . 36-44

– Venting Details. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42-44

A. Installing Exhaust Vent and Intake Air Vent B. General C. Approved Materials for Exhaust Vent and Intake Air Vent D. Exhaust Vent and Intake Air Vent Pipe Location. E. Exhaust Vent and Intake Air Vent Sizing G. Exhaust Vent and Intake Air Pipe Installation. H. Heater Removal from a Common Vent System I. Condensate Removal System J. Diagrams for Side Wall Venting K. Diagrams for Vertical Venting

GAS-FIRED BOILER Boiler Manual

CONTENTS

(CONT’D)

Part 8 – Gas Piping. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45-47

A. Gas Connection B. Gas Piping C. Gas Table D. Dungs Gas Valve

Part 9 – Field Wiring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47-49

A. Installation Must Comply With B. Field Wiring C. Line Voltage Wiring D. Thermostat

Part 10 – Field Wiring – Vision 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

Part 11 – Start Up Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51-53

A. Check/Control Water Chemistry B. Freeze Protection (when used) C. Fill and Test Water System D. Purge Air from Water System E. Check for Gas Leaks F. Check Thermostat Circuit(s) G. Condensate Removal H. Final Checks Before Starting Boiler

Part 12 – Start-Up Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53-55

A. Operating Instructions B. Adjusting the Set Point C. Status Menu D. Test Mode

Part 13 – Start-Up Procedures With The Vision 1 Option . . . . . . . . . . . . . . . . . . . . . . 55-58

A. Programming the Vision I Option B. Vision I Program Access C. Vision I Program Navigation

Part 14 – Trouble Shooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59-61

A. Munchkin Error Code B. Boiler Error C. Boiler Fault

Part 15 – Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61-66

A. Maintenance Procedures B. Combustion Chamber Coil Cleaning Instructions

Part 16 – Boiler Inspection and Maintenance Start-Up Charts . . . . . . . . . . . . . . . . . . 67-69

GAS-FIRED BOILER Boiler Manual

PART 1: PRODUCT AND SAFETY INFORMATION

SPECIAL ATTENTION BOXES

The following defined terms are used throughout this manual to bring attention to the presence of hazards of various risk levels or to important information concerning the product.

DANGER

DANGER indicates an imminently hazardous situation which, if not avoided, will result in death or serious injury.

WARNING

WARNING indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury.

CAUTION

CAUTION Indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate injury.

CAUTION

CAUTION used without the safety alert symbol indicates a potentially hazardous situation which, if not avoided, may result in property damage.

DEFINITIONS

NOTICE

Heat Transfer Products, Inc., reserves the right to make product changes or updates without notice and will not be held liable for typographical errors in literature.

WARNING

If the information in this manual is not followed exactly, a fire or explosion may result causing property damage, personal injury or loss of life.

Do not store or use gasoline or other flammable vapors and

liquids in the vicinity of this or any other appliance.

WHAT TO DO IF YOU SMELL GAS

• Do not try to light any appliance.

• Do not touch any electrical switch: do not use any phone in your building.

• Immediately call your gas supplier from a neighbor's phone. Follow the gas supplier's instructions.

• If you cannot reach your gas supplier, call the fire department. Installation and service must be performed by a qualified installer, service agency or the gas supplier.

GAS-FIRED BOILER Boiler Manual

PART 1: PRODUCT AND SAFETY INFORMATION

(CONT’D)

Before Installing

WHEN SERVICING BOILER

• To avoid electric shock, disconnect electrical supply before performing maintenance.

• To avoid severe burns, allow boiler to cool before performing maintenance.

BOILER OPERATION

• Do not block flow of combustion or ventilation air to boiler.

• Should overheating occur or gas supply fail to shut off, do not turn off or disconnect electrical supply to circulator. Instead, shut off the gas

supply at a location external to the appliance.

• Do not use this boiler if any part has been under water. Immediately call a qualified service technician to inspect the boiler and to replace any part of the control system and any gas control that has been under water.

BOILER WATER

• If you have an old system with cast iron radiators, thoroughly flush the system (without boiler connected) to remove sediment. The high-efficiency heat exchanger can be damaged by build-up or corrosion due to sediment.

• Do not use petroleum-based cleaning or sealing compounds in boiler system. Gaskets and seals in the system may be damaged. This can result in substantial property damage.

• Do not use “homemade cures” or “boiler patent medicines.” Substantial property damage, damage to boiler, and/or serious personal injury may result.

• Continual fresh make-up water will reduce boiler life. Mineral buildup in heat exchanger reduces heat transfer, overheats the stainless steel heat exchanger, and causes failure. Addition of oxygen carried in by make-up water can cause internal corrosion in system components. Leaks in boiler or piping must be repaired at once to prevent make-up water.

FREEZE PROTECTION FLUIDS

WARNING

Installer — Read all instructions in this manual, and Munchkin Venting section, before installing. Perform steps in the order given.

User — This manual is for use only by a qualified heating installer/service technician. Refer to User’s Information Manual for your reference.

User — Have this boiler serviced/inspected by a qualified service technician annually.

Failure to comply with the above could result in severe personal injury, death or substantial property damage.

WARNING

Failure to adhere to the guidelines on this page can result in severe personal injury, death or substantial property damage.

WARNING

WHAT TO DO IF YOU SMELL GAS

• Do not try to light any appliance.

• Do not touch any electric switch; do not use any phone in your building.

• Immediately call your gas supplier from a neighbor's phone. Follow the gas suppliers' instructions.

• If you cannot reach your gas supplier, call the fire department.

CAUTION

Consider piping and installation when determining boiler location. Any claims for damage or shortage in shipment must be filed immediately against the transportation company by the consignee.

CAUTION

NEVER use automotive or standard glycol antifreeze, even ethylene glycol made for hydronic systems. Use only inhibited propylene glycol solutions, which are specifically formulated for hydronic systems. Ethylene glycol is toxic and can attack gaskets and seals used in hydronic systems.

GAS-FIRED BOILER Boiler Manual

PART 2: HOW BOILER OPERATES

Munchkin Condensing Technology is an intelligent system that delivers highly efficient hydronic heating, while maximizing efficiency by measuring the Data Parameters of your heating system.

1. Stainless Steel Heat Exchanger

The highly efficient durable Munchkin Stainless Steel Heat Exchanger is designed to take the colder return water from the system and extract the last bit of energy before it is exhausted. The heat exchanger design is separated by an internal baffle which diverts the exhaust gas through the primary heat exchanger into the secondary heat exchanger where the colder return water extracts the last residual heat.

2. Modulating Combustion System

Modulation during the central heating operation is based on the supply temperature. The set point used for the control depends upon the programmed central heating curve. The slope of the heating curve can be changed by the installer of the Munchkin in the sense that both turning points of the curve can be moved. The control monitors the system to regulate the output of the burner during operation to match the system demand. This increase in efficiency allows for substantial fuel savings.

3. Gas Valve

The gas valve senses suction from the blower, allowing gas to flow only if the gas valve is powered and combustion air is flowing.

4. Supply water temperature sensor

This sensor monitors boiler output water temperature (system supply). The control module adjusts the boiler firing rate so the outlet temperature is correct.

5. Return water temperature sensor

This sensor monitors the return water temperature (system return). The control module reduces or increases boiler input, depending on how close the return water temperature is to the outlet water temperature.

6. Temperature and pressure gauge

Allows the user to monitor the systems

temperature and pressure.

7. Control

The integrated control system monitors the return and supply water and regulates the fan speed to regulate the unit’s BTU output. This allows the unit to only deliver the amount of heated energy required and nothing more!

8. Burner

Constructed of high grade stainless steel construction, the burner uses pre-mixed air and gas and provides a wide range of firing rates.

9. Electrical field connections with terminal strips

The electrical cover plate allows access the line voltage terminal strip and the low voltage terminal strip. Attach line voltage conduits to the three holes at the right of the line voltage terminal strip for power, CH pump and DHW pump. Route low voltage wires through the opening to the left of the low voltage terminal strip. (See Field Wiring Instructions Part 9.)

10. Condensate drain connection

This is a condensing high efficiency appliance, therefore this unit has a condensate removal system. Condensate is nothing more than water vapor, derived from the combustion products, similar to an automobile when it is initially started. It is very important that the condensate line is sloped away from the boiler and down to a suitable inside drain, if the condensate outlet on the Munchkin is lower than the drain, you must use a condensate removal pump (kit p/n 554200 available from Heat Transfer Products, Inc.) A condensate filter, if required by local authorities can be made up of lime crystals, marble or phosphate chips and will neutralize the condensate. This can be done in the field by the installer or you may purchase one from Heat Transfer Products, Inc. (P/N N1100). It is also very important that the condensate line is not exposed to freezing temperatures or any other type of blockage. Plastic tubing must be the only material used for the condensate line. Steel, brass, copper or others will be subject to corrosion or deterioration. A second vent may be necessary to prevent condensate line vacuum lock if a long horizontal run is used.

GAS-FIRED BOILER Boiler Manual

PART 2: HOW BOILER OPERATES

(CONT’D)

Also, an increase in pipe size may be necessary to drain properly. Support of the condensation line may be necessary to avoid blockage of the condensate flow.

11. Spark ignition

The burner flame is ignited by applying a high voltage to the system spark electrode. This causes a spark from electrode to ground.

12. The Vision 1 System

The Vision I System will allow the installing contractor to take the highly efficient modulating Munchkin and make it even more efficient by controlling the temperature delivered to the central heating circuits based on the outside temperature. The Vision I system is also a two temperature system, one

temperature for central heating and the other temperature to the Super Stor Ultra Indirect water heater. This allows the user to increase the temperature supplied to the Super Stor Ultra indirect water heater to get a fast recovery by prioritizing the flow at a higher temperature than may be needed for the central heating circuits (this will require two separate circulators). You must follow the piping, wiring and programming instructions located in the Vision One section of this manual. The Vision 1 kit consists of the following, which is included with your equipment

• Outdoor sensor – 7250P-319

• Indirect tank sensor – 7250P-325

PART 3: PREPARE BOILER LOCATION

A. BOILER LOCATION SHOULD BE LEVEL

CAUTION

When preparing the boiler location, make sure the area where you are placing the boiler is level. In order for the condensate to flow to the location of the condensate hose, the boiler must be slightly pitched back to assure proper flow direction. The Munchkin Boiler comes equipped with leveling feet. Should you find the floor beneath the boiler is uneven, with a wrench, adjust the leveling feet so the boiler is pitched back at 1/8” per foot

INCORRECT CORRECT

GAS-FIRED BOILER Boiler Manual

Figure 2-1

T50M/T80M

DIMENSIONS

PERFORMANCE RATINGS

Input Modulation DOE Heating AFUE

Shipping

Weight

*IBR

18,000 to 50,000 16,000 to 46,000 92% 58 lbs. 40,000 19,000 to 80,000 17,000 to 74,000 92% 58 lbs. 64,000

27,000 to 80,000 25,000 to 74,000 92% 75 lbs. 64,000 46,000 to 140,000 43,000 to 129,000 92% 101 lbs. 112,000 66,000 to 199,000 61,000 to 183,000 92% 111 lbs. 159,000

100,000 to 399,000 93,000 to 279,000 92% 252 lbs. N/A

Model

T50M T80M

80M 140M 199M 399M

CONNECTION SIZES

Supply/

Return

Connection

Gas

Connection

Size

Vent

Dia.

1 1/4" NPT 3/4" 2" 1 1/4" NPT 3/4" 2" 1 1/4" NPT 3/4" 3" 1 1/4" NPT 3/4" 3" 1 1/4" NPT 3/4" 3"

2" NPT 1-1/4" 4"

FAN SPEEDS

High Low

3000 1250 4250 1200 3700 1600 3550 1400 4800 1550 5700 1675

GAS-FIRED BOILER Boiler Manual

DIMENSIONS

80M

140M/199M

Figure 2-2

Figure 2-3

GAS-FIRED BOILER Boiler Manual

PART 3: PREPARE BOILER LOCATION (CONTINUED)

C. BEFORE LOCATING THE BOILER

1. Check for nearby connection to:

• System water piping

• Venting connections

• Gas supply piping

• Electrical power

2. Check area around boiler. Remove any combustible materials, gasoline and other flammable liquids.

3. The Munchkin gas control system components are protected from dripping or spraying water

B. INSTALLATIONS MUST COMPLY WITH:

• Local, state, provincial, and national codes, laws, regulations and ordinances.

• National Fuel Gas Code, ANSI Z223.1 – latest edition.

• Standard for Controls and Safety Devices for Automatically Fired Boilers, ANSI/ASME CSD-1, when required.

• National Electrical Code.

• For Canada only: B149.1 or B149.2 Installation Code, CSA C22.1 Canadian Electrical Code Part 1 and any local codes.

NOTICE

The Munchkin Boiler gas manifold and controls met safe lighting and other performance criteria when boiler underwent tests specified in ANSI Z21.13 — latest edition.

WARNING

Failure to keep boiler area clear and free of combustible materials, gasoline and other flammable liquids and vapors can result in severe personal injury, death or substantial property damage.

399M

Figure 2-4

DIMENSIONS

GAS-FIRED BOILER Boiler Manual

or rain during operation or service.

4. If the Munchkin Boiler is to replace an existing boiler, check for and correct any existing system problems such as:

• System leaks.

• Incorrectly-sized expansion tank.

• Lack of freeze protection in boiler water causing system and boiler to freeze and leak.

• Excessive glycol which will affect the boiler system operation.

D. CLEARANCES FOR SERVICE ACCESS

1. See Figure 3-1 for recommended service clearances. If you do not provide minimum clearances shown, it might not be possible to service the boiler without removing it from the space.

PART 3: PREPARE BOILER LOCATION

(CONTINUED)

E. RESIDENTIAL GARAGE INSTALLATION

Precautions

Take the following special precautions when installing the boiler in a residential garage. If the boiler is located in a residential garage, per ANSI Z223.1, paragraph 5.1.9:

• Mount the boiler with a minimum of 18 inches above the floor of the garage to the bottom of the boiler to ensure the burner and ignition devices will be no less than 18 inches above the floor.

• Locate or protect the boiler so it cannot be damaged by a moving vehicle.

F. EXHAUST VENT AND INTAKE AIR VENT

The Munchkin Boiler requires a special vent system, designed for pressurized venting. Munchkin Boilers are rated ANSI Z21.13 Category IV (pressurized vent, likely to condense in the vent).

You must also install air intake piping from outside to the boiler flue adaptor. The resultant installation is categorized as direct vent (sealed combustion). Note: To prevent combustion

air contamination see Table 3-2 in this section when considering exhaust vent and intake air vent termination.

Intake and exhaust must terminate near each other and may be vented vertically through the roof or out a side wall. The intake and exhuast venting methods are detailed in the Venting Section. Do not attempt to install the Munchkin Boiler using any other means. Be sure to locate the boiler such that the air intake and exhaust

WARNING

The space must be provided with combustion/ventilation air openings correctly sized for all other appliances located in the same space as the Munchkin boiler. The boiler cover must be securely fastened to the boiler to prevent boiler from drawing air from inside the boiler room. This is particularly important if the boiler is located in the same room as other appliances. Failure to comply with the above warnings could result in severe personal injury, death or substantial property damage.

Figure 3-1: Clearances required

80M/140M/199M/399M

T50M/T80M

GAS-FIRED BOILER Boiler Manual

vent piping can be routed through the building and properly terminated. The air intake and exhaust vent piping lengths, routing and termination method must all comply with the methods and limits given in the Venting section.

G. PREVENT COMBUSTION AIR CONTAMINATION

Install intake air piping for the Munchkin Boiler as described in the Venting section. Do not terminate exhaust in locations that can allow contamination of intake air.

H. WHEN REMOVING A BOILER FROM AN

EXISTING COMMON VENT SYSTEM

At the time of removal of an existing boiler, the following steps shall be followed with each appliance remaining connected to the common venting system placed in operation, while the other appliances remaining connected to the common venting system are not in operation.

a. Seal any unused openings in the common

venting system.

b. Visually inspect the venting system for

proper size and horizontal pitch and determine there is non blockage or restriction, leakage, corrosion and other deficiencies which could cause an unsafe condition.

c. Insofar as is practical, close all building doors

and windows and all doors between the space in which the appliances remaining connected to the common venting system are located and other spaces of the building. Turn on clothes dryers and any appliance not connected to the common venting system. Turn on any exhaust fans, such as range hoods and bathroom exhausts, so they will operate at maximum speed. Do not operate a summer exhaust fan. Close fireplace dampers.

d. Place in operation the appliance being

inspected. Follow the lighting instructions. Adjust thermostat so appliance will operate continuously.

e. Test for spillage at draft hood opening after 5

PART 3: PREPARE BOILER LOCATION

(CONTINUED)

DANGER

Do not install the Munchkin Boiler into a common vent with any other appliance. This will cause flue gas spillage or appliance malfunction, resulting in possible severe personal injury, death or substantial property damage.

WARNING

Failure to follow all instructions can result in flue gas spillage and carbon monoxide emissions, causing severe personal injury or death.

Products to avoid

Spray cans containing fluorocarbons Permanent wave solutions Chlorinated waxes/cleaners Chlorine-based swimming pool chemicals Calcium chloride used for thawing Sodium chloride used for water softening Refrigerant leaks Paint or varnish removers Hydrochloric acid/muriatic acid Cements and glues Antistatic fabric softeners used in clothes dryers Chlorine-type bleaches, detergents, and cleaning

solvents found in household laundry rooms Adhesives used to fasten building products and other similar products

Areas likely to have contaminants

Dry cleaning/laundry areas and establishments Swimming pools Metal fabrication plants Beauty shops Refrigeration repair shops Photo processing plants Auto body shops Plastic manufacturing plants Furniture refinishing areas and establishments New building construction Remodeling areas Garages and workshops

Table 3-2: Corrosive contaminants and sources

WARNING

You must pipe outside air to the boiler air intake. Ensure that the intake air will not contain any of the contaminants below. Contaminated air will damage the boiler, resulting in possible severe personal injury, death or substantial property damage. For example, do not pipe intake air vent near a swimming pool. Also avoid areas subject to exhaust fumes from laundry facilities. These areas will always contain contaminants.

GAS-FIRED BOILER Boiler Manual

WARNING

To avoid water damage or scalding due to relief valve operation:

• Discharge line must be connected to relief valve outlet and run to a safe place of disposal. Terminate the discharge line in a manner that will prevent possibility of severe burns or property damage should the valve discharge.

• Discharge line must be as short as possible and be the same size as the valve discharge connection throughout its entire length.

• Discharge line must pitch downward from the valve and terminate at least 6” above the floor drain where any discharge will be clearly visible.

• The discharge line shall terminate plain, not threaded, with a material serviceable for temperatures of 375 °F or greater.

• Do not pipe the discharge to any place where freezing could occur.

• No shutoff valve shall be installed between the relief valve and boiler, or in the discharge line. Do not plug or place any obstruction in the discharge line.

• Test the operation of the valve after filling and pressurizing system by lifting the lever. Make sure the valve discharges freely. If the valve fails to operate correctly, replace it with a new relief valve.

• Failure to comply with the above guidelines could result in failure of the relief valve to operate, resulting in possibility of severe personal injury, death or substantial property damage.

minutes of main burner operation. Use the flame of a match or candle, or smoke from a cigarette, cigar, or pipe.

f. After it has been determined that each

appliance remaining connected to the common venting system properly vents when tested as outlined herein, return doors, windows, exhaust fans, fireplace dampers, and any other gas-burning appliance to their previous conditions of use.

g. Any improper operation of common venting

system should be corrected so the installation conforms with the National Fuel Gas Code, ANSI Z223.1 — latest edition. Correct by resizing to approach the minimum size as determined using the appropriate tables in Table 13 of NFPA54 ANSI Z223.1 2006 of that code. Canadian installations must comply with B149.1 or B149.2 Installation Code.

CAUTION

Cold weather handling — If boiler has been stored in a very cold location (below 0°F) before installation, handle with care until the plastic components come to room temperature.

PART 3: PREPARE BOILER LOCATION

(CONTINUED)

PART 4: PREPARE BOILER

A. REMOVE BOILER FROM BOX

1. Prior to installing, care must be taken to place boiler in a safe location prior to installation on the wall to prevent damage to the mechanical connections.

PART 5: BOILER PIPING

A. RELIEF VALVE

Connect discharge piping to safe disposal location, following guidelines in the WARNING below.

GAS-FIRED BOILER Boiler Manual

PART 5: BOILER PIPING

(CONTINUED)

B. GENERAL PIPING INFORMATION

C. SEPARATE LOW WATER CUTOFF

A low water cutoff may be required by state local code or some insurance companies. Check code requirements before installation of the Munchkin Boiler. It is also required that a low water cutoff be used if the boiler is installed above the piping level.

If required:

• Use a low water cutoff designed for hydronic installations that is an electrode probe type

• Install in a tee on the supply piping above the boiler

• Follow low water cutoff manufacturer’s instructions

D. BACKFLOW PREVENTER

Use a backflow preventer specifically designed for hydronic boiler installations. This valve should be installed on the cold water fill supply line per local codes. (See piping details at the end of this section.)

E. SYSTEM WATER PIPING METHODS

Expansion tank and make-up water

1. Ensure expansion tank size will handle boiler

and system water volume and temperature. Allow 3 gallons for boiler and its piping and 4 gallons for the 399.

2. Expansion tank must be located as shown in Boiler Piping Part 5, or following recognized design methods. See tank manufacturer’s instructions for details.

3. Connect the expansion tank to the air separator only if the separator is on the suction side of the circulator. Always install the system fill connection at the same point as the expansion tank connection to the system.

4. Most chilled water systems are piped using a closed type expansion tank.

Diaphragm (or bladder) expansion tank

1. Always install an automatic air vent on top of the air separator to remove residual air from the system.

F. CIRCULATORS

Sizing space heat system piping

1. See Piping Details in this manual Part 5. In all

CAUTION

DO NOT install automatic air vents on closedtype expansion tank systems. Air must remain in the system and return to the tank to provide its air cushion. An automatic air vent would cause air to leave system, resulting in waterlogging the expansion tank.

CAUTION

DO NOT use the boiler circulator in any location other than the ones shown in this manual. The boiler circulator is selected to ensure adequate flow through the Munchkin Boiler. Failure to comply could result in unreliable performance and nuisance shut downs from insufficient flow.

CAUTION

All piping methods shown in this manual use primary/secondary connection to the boiler loop. This is to avoid the possibility of noise or actuator problems in zone valves because of the high-head boiler circulator. For other piping methods, consult your local Heat Transfer Products representative or refer to separate Munchkin Boiler piping details in this manual (Part 5).

CAUTION

Undersized expansion tanks cause system water to be lost from relief valve and makeup water to be added through fill valve. Eventual boiler failure can result due to excessive makeup water addition.

NOTICE

The Munchkin Boiler control module uses temperature sensors to provide both high limit protection and modulating temperature control. The control module also provides low water protection by sensing the water pressure of the heat exchanger. Some codes/jurisdictions may require additional external controls for high limit and/or low water cutoff protection.

GAS-FIRED BOILER Boiler Manual

PART 5: BOILER PIPING

(CONTINUED)

diagrams, the space heating system is isolated from the boiler loop by the primary/secondary connection.

2. Size the piping and components in the space heating system using recognized design methods.

G. HYDRONIC PIPING WITH CIRCULATORS,

ZONE VALVES AND MULTIPLE BOILERS

The Munchkin Boiler is designed to function in a closed loop 15 PSI System. A factory installed water pressure switch will ensure that you have adequate pressure in the system. The Munchkin Boiler will not operate without a minimum of 10 PSI water pressure. This assures you that if the system does have leak, the Munchkin Boiler will lock out (PRO on the display) before it damages the Stainless Steel Heat Exchanger. We have also included a Temperature and Pressure gauge which allows the user to monitor the system pressure and outlet temperature from the Munchkin Boiler. It is important to note that the Munchkin Boiler has a minimal amount of pressure drop and must be calculated when sizing the circulators. Each Munchkin Boiler installation must have an Air Elimination device that will remove air from the system. Install the Munchkin Boiler so the gas ignition system components are protected from water (dripping, spraying, etc.) allowing clearance for basic service of circulator replacement, valves and other. Observe minimum 1” clearance around all un-insulated hot water pipes when openings around pipes are not protected by noncombustible materials. On a Munchkin Boiler installed above radiation level, some states and local codes require a low water cut off device at the time of installation (See Part C this section). If the Munchkin Boiler supplies hot water to heating coils in air handler units, flow control valves or other devices must be installed to prevent gravity circulation of heater water in the coils during the cooling cycle. Chilled Water Medium must be piped in parallel with the heater. Freeze Protection for new or existing systems must use glycol that is specifically formulated for this purpose. It will include inhibitors that will prevent the glycol from attacking the metallic system components. Make

certain that the system fluid is checked for the correct glycol concentration and inhibitor level. The system should be tested at least once a year and as recommend by the producer of the glycol solution. Allowance should be made for the expansion of the glycol solution in the system piping. Example 50% by volume solution expands 4.8% in volume for the temperature increase from 32 F to 180 F, while water expands 3% with the same temperature rise.

Basic steps are listed below, with Illustration, which will guide you through the installation of the Munchkin.

1. Connect the system return marked “Heater In”.

2. Connect the system supply marked “Heater Out”.

3. Install Purge and Balance Valve or shut off valve and drain on system return to purge air out of each zone.

4. Install a Back Flow preventor on the Cold Feed Make-Up Water line.

5. Install a Pressure Reducing Valve on the Cold Feed Make-Up Water line, (15 PSI nominal on the system return). Check Temperature and Pressure Gauge which should read minimum pressure of 12 PSI.

6. Install a circulator as shown in piping details (this section). Make sure the circulator is properly sized for the system and friction loss.

7. Install an Expansion Tank on the system supply. Consult the tank manufacturer’s instruction for specific information relating to expansion tank installation. Size the expansion tank for the required system volume and capacity.

8. Install an Air Elimination Device on the system supply.

9. Install a drain valve at the lowest point of the system. Note: The Munchkin Boiler can not be drained completely of water without purging the unit with an air pressure 15 PSI.

CAUTION

The Munchkin Boiler should not be operated as a potable Hot Water Heater. It should not be used as a direct Hot Water Heating Device.

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10. The Safety Relief Valve is installed at the factory. Pipe the discharge of the safety relief valve to prevent injury in the event of pressure relief. Pipe the discharge 6” above the drain to a drain. Provide piping that is the same size as the safety relief valve outlet. Never block the

outlet of safety relief valve.

H. CIRCULATOR SIZING

The Munchkin Boiler Heat Exchanger does have pressure drop which must be considered in your system design. Refer to the graph in Fig. 51 below for pressure drop through the Munchkin Boiler Heat Exchanger for recommended pump selection at a 20∆t design.

PART 5: BOILER PIPING

(CONTINUED)

Figure 5-1

Figure 5-2

5 10152025303537.540

Flow in Gallons per Minute

Friction in Feet of Head

MUNCHKIN 399M

* NOTE: The recommended circulators are based on 1 gpm per 10,000 btu/hr with 20°∆t.

ocaTsofdnurGttessoG&lleB

1P2P1P2P1P2P

M08/08T/05T

7009002-DPSF85-51SPU3-DPSF85-51SPU22-FRN22-FRN

M041

01001100F46-62F69-6233-FRN63-FRN

M991

11003100F69-62F69-6263-FRN63-FRN

M993

05-004105-0041061-23SPU061-23SPU55-LP55-LP

CIRCULATOR SIZING CHART

for Central Heating Circulator (P1)* and SuperStor Ultra Circulator (P2)*

Note: SuperStor Ultra Indirect pump assumes the following: (6) 90 degree elbows and (1) tee on the run of 20' and 1" of copper tube size, but does not include any flow checks or zone valves. *See drawings on the following pages

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PART 5: BOILER PIPING

(CONTINUED)

I. FILL AND PURGE HEATING SYSTEM

• Attach the hose to balance and purge hose connector or drain valve and run hose to nearest drain

• Close the other side of the balance and purge valve or the shut off valve after the drain.

• Open first zone balance and purge or drain valve to let water flow out the hose. If zone valves are used, open the valves one at a time manually. (Note: You should check valve manufacturer’s instruction prior to opening valves manually, so as not to damage the valve.)

• Manually operate fill valve regulator. When water runs out of the hose, while it’s connected to the balance and purge valve or drain you will see a steady stream of water (without bubbles). Close balance and purge valve or drain to stop the water from flowing. Disconnect the hose and connect it to next zone to be purged.

• Repeat this procedure for additional zones (one at time).

Upon completion, make sure that the fill valve is in automatic position and each zone balance and purge or shut off is in an open position and zone valves are positioned for automatic operation.

1. Glycol in hydronic applications which is specially formulated for this purpose includes inhibitors that prevent the glycol from attacking metallic system components. Make certain that the system fluid is checked for the correct glycol concentration and inhibitor level.

2. The glycol solution should be tested at least once a year and as recommended by the glycol manufacturer.

3. Anti-freeze solutions expand more than water. For example a 50% by volume solution expands 4.8% in volume for a temperature increase from 32° F to 180° F, while water expands 3% with the same temperature rise. Allowances must be made for this expansion in the system design.

4. A 30% mixture of glycol will result in a BTU output loss of 15% with a 5% increase in head against system circulator.

5. A 50% mixture of glycol will result in a BTU output loss of 30% with a 50% increase in head against system circulator.

CAUTION

For installation that incorporates standing Iron Radiation and systems with manual vents at the high points. Follow above section and starting with the nearest manual air vent, open vent until water flows out, then close vent. Repeat procedure, working your way toward furthest air vent. It may be necessary to install a basket strainer in an older system where larger amounts of sediment may be present. Annual cleaning of the strainer may be necessary.

WARNING

Use only inhibited propylene glycol solutions which are specially formulated for hydronic systems. Ethylene glycol is toxic and can attack gaskets and seals used in hydronic systems. Glycol mixtures should not exceed 50%.

N/R = Not Recommended N/A = Not Available

SYSTEM TEMPERATURE RISE CHART

Model

Friction Feet

20°∆t Flow

G P M

Friction Feet

25°∆t

Flow

G P M

Friction

Feet

30°∆t

Flow

G P M

Friction

Feet

35°∆t

Flow

G P M

Friction

Feet

40°∆t

Flow

G P M

Friction

Feet

45°∆t

Flow

G P M T-50 6.5’ 5 4.5’ 4 3’ 3.3 2’ 2.5 N/A N/R N/A N/R T-80 7.8’ 8 4.7’ 6.4 2.9’ 5.3 2’ 4.6 1.5’ 4 1’ 3.5

80M 7.8’ 8 4.7’ 6.4 2.9’ 5.3 2’ 4.6 1.5’ 4 1’ 3.5 140M 11’ 14 8’ 11.2 6’ 9.3 4.75’ 8 3.75’ 7 2.5’ 6.2 199M 17’ 19 12.3’ 15.2 8.5’ 12.6 5.75’ 10.8 4’ 9.5 2.5’ 8.4 399M 21’ 39 9’ 31.2 7’ 26 6’ 22.3 5’ 19.5 4’ 17.3

The chart below represents the various system temperatures, their respective flows and friction loss through the Munchkin which will aid in circulator selection.

GAS-FIRED BOILER Boiler Manual

PART 5: BOILER PIPING

(CONTINUED)

J. ZONING WITH ZONE VALVES

1. Connect boiler to system as shown in 2A and 2B in Piping Details when zoning with zone valves. The primary/secondary piping shown ensures the boiler loop will have sufficient flow. It also avoids applying the high head of the boiler circulator to the zone valves.

2. Connect DHW (domestic hot water) piping to indirect storage water heater as shown.

K. ZONING WITH CIRCULATORS

1. Connect boiler to system when circulator zoning as shown in 1C and 1D in Piping Details when zoning with circulators. The boiler circulator cannot be used for a zone. It must supply only the boiler loop.

2. Install a separate circulator for each zone.

3. Connect DHW (domestic hot water) piping to indirect storage water heater as shown.

L. MULTIPLE BOILERS

1. Connect multiple boilers as shown in 1E and 1F in Piping Details.

2. All piping shown is reverse return to assure balanced flow through the connected boilers.

3. Each connected boiler must have its own circulator pump to assure adequate flow.

4. Connect DHW (domestic hot water) piping to indirect storage water heater as shown.

CAUTION

It is highly recommended that you carefully follow the glycol manufacturer’s recommended concentrations, expansion requirements and maintenance recommendations (pH additive breakdown, inhibitor reduction, etc.). You must carefully figure the additional friction loss in the system as well as the reduction in heat transfer co-efficients.

GAS-FIRED BOILER Boiler Manual

Piping Symbol Legend

circulator (w/ isolation flanges)

gate valve

globe valve

ball valve

swing-check valve

flow-check valve

spring-loaded check valve

hose bib / boiler drain

thermostatic radiator valve TRV (straight)

circuit setter

manual 3-way valve

zone valve

air separator

backflow preventer

diaphragm-type expansion tank

pressure reducing valve

diff. pressure bypass

anti-scald rated mixing valve

pressure gauge

4-way motorized mixing valve

3-way motorized mixing valve

pressure relief valve

float -type air vent

heat exchanger

union

Munchkin heater

radiant manifold

Super Stor

indirect DHW tank

vacuum breaker

thermostatic radiator valve TRV (angle)

circulator w/ integral flow check)

M. BOILER PIPING DETAILS

GAS-FIRED BOILER Boiler Manual

NOTE: For Vision piping applications, refer to the Vision Installation Piping Diagrams.

Standard Munchkin boiler Preferred piping (zoning with valves)

Space heating mode

zone valves

make-up water

closely

spaced

tees

purging

valves

OFF

Drawing 2A

differential pressure bypass valve

anti-scald

mixing valve

cold

water

T/P

Munchkin boiler

Super Stor

indirect DHW tank

NOTES:

1. This drawing is meant to show system piping concept only. Installer is responsible for all equipment & detailing required by local codes.

2. Adjust differential pressure bypass valve to eliminate any flow velocity noise when zone with highest pressure drop operates by itself.

3. The minimum pipe size for connecting a Super Stor water heater is 1 inch. The minimum pipe size for connecting a Munchkin boiler is 1.25 inches and 2 inches for the 399M.

5. All pumps are shown with isolation flanges. The alternative is standard flanges with full port ball valves. The anti-scald mixing valve is recommended if the DHW temperature is set above the factory setting of 119˚F.

7. Install a minimum of 12 diameters of straight pipe upstream of all circulators.

8. A purging valve may be used in lieu of the ball valve / hose bib combination shown. A minimum of 6 pipe diameters of straight pipe shall be installed upstream and downstream

9. of all closely spaced tees.

GAS-FIRED BOILER Boiler Manual

NOTE: For Vision piping applications, refer to the Vision Installation Piping Diagrams.

Standard Munchkin boiler Preferred piping (zoning with valves)

Domestic water heating mode

zone valves

make-up water

closely

spaced

tees

purging

valves

OFF

anti-scald

mixing valve

Drawing 2B

OFF

differential pressure bypass valve

cold

water

T/P

Munchkin boiler

Super Stor

indirect DHW tank

NOTES:

1. This drawing is meant to show system piping concept only. Installer is responsible for all equipment & detailing required by local codes.

2. Adjust differential pressure bypass valve to eliminate any flow velocity noise when zone with highest pressure drop operates by itself.

3. The minimum pipe size for connecting a Super Stor water heater is 1 inch. The minimum pipe size for connecting a Munchkin boiler is 1.25 inches and 2 inches for the 399M.

7. Install a minimum of 12 diameters of straight pipe upstream of all circulators. A purging valve may be used in lieu of the ball valve / hose bib combination shown.

8. A minimum of 6 pipe diameters of straight pipe shall be installed upstream and downstream

9. of all closely spaced tees.

GAS-FIRED BOILER Boiler Manual

NOTE: For Vision piping applications, refer to the Vision Installation Piping Diagrams.

Standard Munchkin boiler Preferred piping (zoning with circulators)

Space heating mode

space heating zone circuit

make-up water

closely

spaced

tees

purging

valves

Drawing 2C

zone circulators

anti-scald

mixing valve

cold

water

T/P

Munchkin boiler

Super Stor

indirect DHW tank

NOTES:

This drawing is meant to show system piping concept only.

1. Installer is responsible for all equipment & detailing required by local codes. All closely spaced tees shall be within 4 pipe diameter center to center spacing.

3. A minimum of 6 pipe diameters of straight pipe shall be installed upstream and downstream of all closely spaced tees.

4. The minimum pipe size for connecting a Super Stor water heater is 1 inch. The minimum pipe size for connecting a Munchkin boiler shall be 1.25 inches and 2 inches for the 399M.

6. All pumps are shown with isolation flanges. The alternative is standard flanges with full port ball valves.

7. The anti-scald mixing valve is recommended if the DHW temperature is set above the factory setting of 119˚F. Install a minimum of 12 diameters of straight pipe upstream of all circulators.

9. A purging valve may be used in lieu of the ball valve / hose bib combination shown.

GAS-FIRED BOILER Boiler Manual

NOTE: For Vision piping applications, refer to the Vision Installation Piping Diagrams.

Standard Munchkin boiler Preferred piping (zoning with circulators)

Domestic water heating mode

space heating zone circuit

make-up water

closely

spaced

tees

purging

valves

Drawing 2D

zone circulators

anti-scald

mixing valve

cold

water

T/P

Munchkin boiler

Super Stor

indirect DHW tank

NOTES:

This drawing is meant to show system piping concept only.

1. Installer is responsible for all equipment & detailing required by local codes. All closely spaced tees shall be within 4 pipe diameter center to center spacing.

3. A minimum of 6 pipe diameters of straight pipe shall be installed upstream and downstream of all closely spaced tees.

4. The minimum pipe size for connecting a Super Stor water heater is 1 inch. The minimum pipe size for connecting a Munchkin boiler shall be 1.25 inches and 2 inches for the 399M.

6. All pumps are shown with isolation flanges. The alternative is standard flanges with full port ball valves. The anti-scald mixing valve is recommended if the DHW temperature is set above the factory setting of 119˚F.

8. Install a minimum of 12 diameters of straight pipe upstream of all circulators. A purging valve may be used in lieu of the ball valve / hose bib combination shown.

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