Munchkin VWH High Efficiency Hot Water Supply Boiler User Manual

Installing, Operating & Maintaining  
MUNCHKIN VWH HIGH EFFICIENCY  
HOT WATER SUPPLY BOILER  
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.  
CONTROLS  
MH27745  
WARNING  
This manual must only be used by a qualified heating installer / service  
technician. Failure to comply could result in severe personal injury, death or  
substantial property damage. It is also important to keep these Instructions  
with the appliance.  
HEAT TRANSFER PRODUCTS, INC.  
120 BRALEY RD., E. FREETOWN, MA  
02717  
TABLE OF CONTENTS  
TABLE OF CONTENTS  
PART 1 . . . . . . . . . . . . . . . . . . . . . .4 thru 8  
GENERAL INFORMATION  
PART 6 . . . . . . . . . . . . . . . . . . . .29 thru 33  
START UP PROCEDURES  
A How It Operates . . . . . . . . . . . . . . . . . .4 A Sequence of Operation . . . . . . . . . . .29  
B
Munchkin Ratings and Dimensions . .5–7  
B
Items to be checked before  
lighting the Munchkin . . . . . . . . . . . . .29  
C Pre-installation Requirements . . . . . . .7  
D Pressure Relief Valve . . . . . . . . . . . . . .8  
C Lighting Instructions . . . . . . . . . . . . . .30  
D Operating Instructions . . . . . . . . . . . .30  
PART 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . .9  
ELECTRICAL  
E
Adjusting the Operating Set Points  
of the Munchkin VWH Display . . . . . .30  
Status Menu . . . . . . . . . . . . . . . . . . . .31  
F
A Electrical Connection . . . . . . . . . . . . . .9  
G Test Mode . . . . . . . . . . . . . . . . . . . . . .31  
H To Turn Off Gas to Appliance . . . . . . .32  
PART 3 . . . . . . . . . . . . . . . . . . . .10 thru 11  
GAS CONNECTION  
PART 7 . . . . . . . . . . . . . . . . . . . .34 thru 36  
TROUBLESHOOTING  
A Gas Connection . . . . . . . . . . . . . . . . . .10  
B
Gas Piping . . . . . . . . . . . . . . . . . . . . . .10  
A Munchkin Error Code . . . . . . . . . . . . .34  
C Gas Table . . . . . . . . . . . . . . . . . . . . . . .10  
B
Boiler Error . . . . . . . . . . . . . . . . . . . . .34  
C Boiler Fault . . . . . . . . . . . . . . . . . . . . .34  
PART 4 . . . . . . . . . . . . . . . . . . . .12 thru 18  
VENTING  
PART 8 . . . . . . . . . . . . . . . . . . . .37 thru 41  
MAINTENANCE  
A Approved Venting Materials . . . . . . . .12  
B
Venting the Munchkin in  
3”, 4” or 6” Plastic Pipe . . . . . . . . . . .12  
C Longer Vent Runs . . . . . . . . . . . . . . .14  
D Heater Removal from a  
Common Vent System . . . . . . . . . . . .15  
Condensate Removal . . . . . . . . . . . . .16  
E
PART 5 . . . . . . . . . . . . . . . . . . . .19 thru 29  
PIPING  
A Expansion Tank . . . . . . . . . . . . . . . . . .19  
High Velocity Circulator Pump . . . . . .19  
B
3
GENERAL INFORMATION  
PART 1. GENERAL INFORMATION  
A. HOW IT OPERATES  
The Munchkin VWH is a hot water supply boiler designed to operate in conjuction with a hot water  
storage tank. Each Munchkin VWH is equipped with a high velocity pump to keep the unit running  
efficiently for many years of service. A flow switch monitors the water flow through the heat exchanger  
to make sure that the unit has an adequate flow rate during operation. The Munchkin VWH Controller  
accurately monitors the return and supply temperature that controls the output range of the Munchkin  
When the system has sensed a temperature drop below the set point and minus the differential set  
point, The Munchkin VWH will activate the blower motor for a pre-purge of 5 seconds before going  
into operation. Once in operation, the Munchkin controller will now start to modulate the pre-mix  
burner based on analyzing the return, supply, differential and operating set point temperatures. By  
compiling this information, the controller utilizes an algorithm to fully adjust the firing rate while  
maintaining the desired output temperature. The pre-mix burner fan has direct drive current, low-  
voltage motor with pulse relay counting. This system allows precise control over the fan speed and  
combustion air volumes. Coupled with the fuel and air mixing system which are set to provide a one  
to one ratio of precisely measured volumes of fuel to air, an accurate and instant burner output is  
achieved. This keeps the Munchkin VWH running at the highest efficiency.  
RECOMMENDED SERVICE CLEARANCES  
RECOMMENDED SERVICE CLEARANCES  
Figure 1-1  
4
GENERAL INFORMATION  
B. MUNCHKIN RATINGS AND DIMENSIONS  
Input  
Modulation  
Output  
Modulation  
Supply/Return Gas Connection Intake/Exhaust Shipping  
Model  
L
W
H
Connection  
1¼” NPT  
2” NPT  
Size  
Dia.  
Weight  
199VWH 66,000–199,000 48,000–191,040  
399VWH 100,000–399,000 96,000–343,040  
¾”  
3” PVC Sch. 40 126 lbs. 24.50 18.25 25.88  
4” PVC Sch. 40 267 lbs. 44.25 18.25 25.88  
1¼”  
FIRST HOUR RATING  
W/ 80 GAL. STORAGE TANK W/ 119 GAL. STORAGE TANK  
FIRST HOUR RATING  
MODEL INLET OUTLET RECOVERY RATE  
199 VWH  
199 VWH  
199 VWH  
199 VWH  
199 VWH  
199 VWH  
199 VWH  
199 VWH  
199 VWH  
199 VWH  
199 VWH  
40°  
40°  
40°  
40°  
40°  
40°  
40°  
40°  
40°  
40°  
40°  
80°  
561 GAL  
450 GAL  
374 GAL  
320 GAL  
280 GAL  
250 GAL  
224 GAL  
205 GAL  
188 GAL  
173 GAL  
160 GAL  
614 GAL  
503 GAL  
427 GAL  
373 GAL  
333 GAL  
303 GAL  
277 GAL  
258 GAL  
241 GAL  
226 GAL  
213 GAL  
640 GAL  
529 GAL  
453 GAL  
399 GAL  
359 GAL  
329 GAL  
303 GAL  
284 GAL  
267 GAL  
252 GAL  
239 GAL  
90°  
100°  
110°  
120°  
130°  
140°  
150°  
160°  
170°  
180°  
399 VWH  
399 VWH  
399 VWH  
399 VWH  
399 VWH  
399 VWH  
399 VWH  
399 VWH  
399 VWH  
399 VWH  
399 VWH  
40°  
40°  
40°  
40°  
40°  
40°  
40°  
40°  
40°  
40°  
40°  
80°  
1125 GPH  
900 GPH  
750 GPH  
642 GPH  
562 GPH  
500 GPH  
450 GPH  
409 GPH  
375 GPH  
346 GPH  
321 GPH  
1178 GAL  
953 GAL  
803 GAL  
695 GAL  
615 GAL  
553 GAL  
503 GAL  
462 GAL  
428 GAL  
399 GAL  
374 GAL  
1204 GAL  
979 GAL  
829 GAL  
721 GAL  
641 GAL  
579 GAL  
529 GAL  
488 GAL  
454 GAL  
425 GAL  
400 GAL  
90°  
100°  
110°  
120°  
130°  
140°  
150°  
160°  
170°  
180°  
199 VWH at 20GPM  
399 VWH at 40GPM  
Pressure Drop for Tube Length of 1¼” Copper  
(10) 90° Elbows ad (2) Tees (Side Outlet)  
with Munchkin 199 VWH  
Pressure Drop for Tube Length of 2” Copper  
(10) 90° Elbows and (2) Tees (Side Outlet)  
with Munchkin 399 VWH  
1¼” Tube Length 20’  
30’  
40’  
50’  
60’  
2” Tube Length  
40 GPM  
20’  
24  
30’  
40’  
50’  
60’  
20 GPM 21.65 22.62 23.6 24.56 25.53  
24.37 24.74 25.11 25.48  
5
GENERAL INFORMATION  
DIMENSIONS  
Figure 1-2  
6
GENERAL INFORMATION  
Figure 1-3  
C. PRE-INSTALLATION REQUIREMENTS  
GENERAL  
bustible construction. In addition, it is design  
certified for use on combustible floors.  
1. Munchkin VWH is supplied completely assem-  
bled as a packaged boiler. The package should  
be inspected for damage upon receipt and any  
damage to the unit should be reported to the  
shipping company and wholesaler. This boiler  
should be stored in a clean, dry area.  
2. Carefully read these instructions and be sure  
to understand the function of all connections  
prior to beginning installation. Contact your  
Heat Transfer Products, Inc. Representative or  
the Heat Transfer Products, Inc. Customer  
Service Department for help in answering  
questions.  
2. Refer to Figure 1.1 for the recommended clear-  
ance to allow for reasonable access to the boil-  
er. Local codes or special conditions may  
require greater clearances.  
CAUTION  
Do not install this boiler on carpeting.  
COMBUSTION AND VENTILATION AIR  
1. The Munchkin VWH is designed only for oper-  
ation with combustion air piped from outside  
(sealed combustion). PVC pipe must be sup-  
plied between the air inlet connection at the  
rear of the boiler through an outside wall.  
3. This boiler must be installed by a qualified  
contractor. The boiler warranty may be voided  
if the boiler is not installed correctly.  
2. No additional combustion or ventilation air is  
required for this appliance.  
3. Refer to Section 4 of this manual, Venting, for  
specific instructions for piping combustion air.  
CODES & REGULATIONS  
Installation and repairs are to be performed in strict  
accordance with the requirements of state and local  
regulating agencies and codes dealing with boiler  
and gas appliance installation.  
PLANNING THE LAYOUT  
1. Prepare sketches and notes showing the lay-  
out of the boiler installation to minimize the  
possibility of interferences with new or exist-  
ing equipment, piping, venting and wiring.  
2. The following sections of this manual should  
be reviewed for consideration of limitations  
with respect to:  
WARNING  
Liquefied Petroleum (LP) Gas or Propane is  
heavier than air and, in the event of a leak, may  
collect in low areas such as basements or floor  
drains. The gas may then ignite resulting in a  
fire or explosion.  
a. Electrical Wiring: Part 2  
b. Gas Connection: Part 3  
c. Venting: Part 4  
ACCESSIBILITY CLEARANCES  
f. Piping the Munchkin VWH to the  
Storage Tank: Part 5  
1. The Munchkin VWH is certified for closet  
installations with zero clearance to com-  
7
GENERAL INFORMATION  
WARNING  
The Munchkin is certified as an indoor appliance. Do not install the Munchkin  
outdoors or locate where it will be exposed to freezing temperature. This includes all  
related piping and components. If the Munchkin is subjected to flood water or  
submersed in water, the Munchkin must be replaced.  
NOTICE  
Service clearance of the Munchkin  
1. The front of the appliance needs 24" of clearance for service minimum. It may have  
a non-rated or combustible door or access panel and must have a minimum of 24"  
clearance.  
2. The left side of the heater is 12" clearance  
3. The right side of the heater is 12" clearance  
4. The top of the heater is 15" clearance.  
If the Munchkin is set up for liquefied petroleum (LP) gas, some geographic areas follow the Uniform  
Mechanical Code, section 304.6, “Liquefied petroleum gas burning appliances shall not be installed in  
a pit, basement or similar location where heavier-than-air gas might collect. Appliances so fueled, shall  
not be installed in a below grade under-floor space or basement unless such location is provided with  
an approved means for removal of unburned gas.”  
NOTICE  
Condensation removal: This is a condensing, high efficiency appliance, therefore  
condensation removal must be addressed to avoid damage to surrounding area or  
appliance. See Part (4) for Condensate Requirements.  
D. PRESSURE RELIEF VALVE  
A pressure relief valve is installed into the right front side of the manifold. It is required that it meets  
the requirements of ANSI/ASME Boiler and Pressure Vessel Code, Section IV or CSA B51: Boiler  
Pressure Vessel and Piping Code as applicable for heating boilers. A ¾” pipe connected to the pressure  
relief valve must be directed to a floor drain or suitable location within 6” of a drain or floor. To protect  
the valve from freezing, do not plug or cap the pressure relief valve.  
DANGER  
Serious explosion causing property damage and/or loss of life could result. Under no  
circumstances should the relief valve be eliminated, capped or plugged.  
8
ELECTRICAL  
PART 2. ELECTRICAL  
A. ELECTRICAL CONNECTION  
The electrical connection for the Munchkin is on the left hand side of the unit. There is a ½” knockout  
location for an electrical connection for both the incoming power and the circulator connection. All  
electrical wiring must be performed by a qualified licensed electrician in accordance with National  
Electrical Code ANSI/NEPA to and/or the Canadian Electrical Code, Part 1 CSA C22.1, or to the  
applicable codes and standards. For your convenience, we have labeled all the wires that need to be  
connected to operate the Munchkin.  
The electrical requirements are for standard 120 volts, 60 Hz 15 Amp service. This unit is wired with  
#18 awg and fused for no more than 15 Amps.  
DANGER  
IT IS EXTREMELY IMPORTANT THAT THIS UNIT BE PROPERLY GROUNDED!  
DANGER  
IT IS VERY IMPORTANT THAT THE BUILDING GROUND IS INSPECTED BY A  
QUALIFIED ELECTRICIAN PRIOR TO MAKING THIS CONNECTION!  
There are two ground points in the electrical compartment that must be connected to the building  
ground system. Connect the building ground to the green ground screw and the green ground wire  
inside electrical box provided.  
The Incoming power supply is connected to the Black (Hot) and the White (Neutral).The Munchkin  
Control board is polarity sensitive. If the polarity is reversed, the Munchkin control will not sense a  
flame and lock out the system.  
It is important that the electrical power is not turned on at this time. Double check all connections and then  
turn the power on. The display that is provided with the Munchkin should now be reading the outlet  
temperature. Note: see Part 6/Startup Procedure section in the manual to change the temperature setting  
or run the heater.  
9
GAS CONNECTION  
PART 3. GAS CONNECTION  
WARNING  
Failure to follow all precautions could result in fire, explosion or death!  
A. GAS CONNECTION  
The gas supply shall have a maximum inlet pressure of less than 14” water column (350 mm), ½ pound  
pressure (3.5 kPa), and a minimum of 7” water column. The entire piping system, gas meter and  
regulator must be sized properly to prevent pressure drop greater than 0.5” as stated in the National  
Fuel Gas Code. This information is listed on the rating plate. It is very important that you are  
connected to the type of gas as noted on the rating plate. “LP” for liquefied petroleum, propane gas  
or, Nat” natural or city gas. All gas connections must be approved by the local gas supplier, or utility  
in addition to the governing authority, prior to turning the gas supply on. The nipple provided for the  
399VWH is 11/4” with a mandatory 1 x 11/4 reducing coupling (provided). Threaded into the branch of  
a 11/4” tee and a drip leg fabricated as per the national fuel gas code. The 199VWH has a 3/4” gas supply  
nipple with a 1/2 x 3/4 reducing coupling (provided) which is to be threaded into the branch of a 3/4” tee.  
You must ensure that the entire gas line to the connection at the Munchkin is no smaller than 11/4”  
for the 399VWH and 3/4” for the 199VWH. Once all the inspections have been performed, the piping  
must be leak tested. If the leak test requirement is a higher test pressure than the maximum inlet  
pressure, you must isolate the Munchkin from the gas line. In order to do this, you must shut the gas  
off using factory and field-installed gas cocks (following the lighting instructions in Part 6 Section B.)  
This will prevent high pressure. Failure to do so may damage the gas valve. In the event the gas valve  
is exposed to a pressure greater than 1/2 PSI, 14” water column, the gas valve must be replaced. Never  
use an open flame (match, lighter, etc.) to check gas connections.  
B. GAS PIPING  
1. Run the gas supply line in accordance with all applicable codes.  
2. Locate and install manual shutoff valves in accordance with state and local requirements.  
C. GAS TABLE  
Refer to Table (1) to size the supply piping to minimize pressure drop between meter or regulator  
and unit.  
Maximum Capacity of Pipe in Cubic Feet of Gas per Hour for Gas Pressures of 0.5 psi or Less and a  
Pressure Drop of 0.3 Inch water Column  
(TABLE 1)  
(Based on a 0.60 Specific Gravity Gas)  
Nominal  
Iron Pipe Internal  
Length of Pipe (Feet)  
Size  
Diameter  
(inches) (inches) 10  
20  
30  
40  
50  
60 70  
80  
90  
90 100  
84 79  
125 150  
72 64  
130 120  
275 250  
410 380  
175 200.  
59 55}  
110 100}  
225 210} HOUR  
350 320} X 1,000  
3/4  
1
.824  
1.049  
278  
520  
190 152 130 115 105 96  
350 285 245 215 195 180 170 160 150  
730 590 500 440 400 370 350 320 305  
BTU'S  
PER  
1 1/4  
1 1/2  
1.380 1,050  
1.610 1,600 1,100 890 760 670 610 560 530 490 460  
10  
GAS CONNECTION  
It is recommended that a soapy solution be used to detect leaks. Bubbles will appear on the pipe to  
indicate a leak is present. The gas piping must be sized for the proper flow and length of pipe, to  
avoid pressure drop. Both the gas meter and the gas regulator must be properly sized for the total  
gas load. If you experience a pressure drop greater than 1" WC, the meter, regulator or gas line is  
undersized or in need of service. You can attach a manometer to the incoming gas drip leg, by  
removing the cap and installing the manometer. The gas pressure must remain between 7" and 14"  
during stand-by (static) mode and while in operating (dynamic) mode. If an in-line regulator is used,  
it must be a minimum of 10 feet from the Munchkin. It is very important that the gas line is prop-  
erly purged by the gas supplier or utility. Failure to properly purge the lines or improper line siz-  
ing, will result in ignition failure. This problem is especially noticeable in NEW LP installations and  
also in empty tank situations. This can also occur when a utility company shuts off service to an area  
to provide maintenance to their lines. This gas valve must not be replaced with a conventional gas  
valve under any circumstances. As an additional safety feature, this gas valve has a flanged con-  
nection to the Venturi and blower.  
WARNING  
Failure to follow all precautions could result in fire, explosion or death!  
11  
VENTING  
PART 4. VENTING  
DANGER  
It is extremely important to follow these venting instructions carefully. Failure to do  
so can cause severe personal injury, death or substantial property damage.  
A. APPROVED VENTING MATERIALS  
EXHAUST VENT  
Use Plastic 3” and 4” and 6” Pipe Schedule 40 or 80.  
1. Non-Foam Core PVC Pipe  
2. Non-Foam Core CPVC Pipe  
3. Non-Foam Core ABS Pipe  
Vent Piping must conform to following  
1. PVC Non Foam Core Pipe (Polyvinyl Chloride) to ASTM D-1784 Class 12454-B, Formerly desig-  
nated Type 1, Grade 1.  
2. CPVC (Chlorinated Polyvinyl Chloride) Class 23447-B, Formerly designated Type IV, Grade 1 con-  
forming to ASTM D-1784.  
3. ABS (Acrylonitrile-Butadiene-Styrene) Class 3-2-2-2-2 conforming to ASTM D3965.  
DANGER  
Foam Core Pipe is not to be used in connecting the exhaust pipe.  
The Munchkin is a direct vent appliance. The Munchkin is listed as a Category  
IV Condensing Appliance. (The Munchkin Venting is rated at Zero Clearance  
to combustibles.)  
Note: For Concrete construction or to meet certain fire codes, exhaust and inlet piping at the wall  
penetration to the Munchkin must be CPVC Schedule 40 or 80 to meet local fire codes. The balance  
from the penetrated wall to the outside, may be PVC Schedule 40 or 80.  
INTAKE VENT  
Use the same material as used for exhaust. Plastic Pipe or Cellular Foam Core Pipe may be used for  
the inlet only, NEVER ON EXHAUST PIPING!  
WARNING  
This vent system will operate with a positive pressure in the vent pipe. Do not  
connect vent connectors serving appliances by natural draft into any portion of  
mechanical draft systems.  
B. VENTING THE MUNCHKIN VWH IN 3”, 4” OR 6” PLASTIC PIPE  
DANGER  
It is extremely important to follow these venting instructions exactly. Failure to do so  
can cause severe personal injury, death or substantial property damage.  
12  
VENTING  
NOTICE  
The following are code restrictions for the location of the flue gas vent terminal.  
Compliance to these requirements doesn’t insure a satisfactory installation; good  
common sense must also be applied. It is important to make sure that exhaust gases  
are not recirculated into the inlet air of the Munchkin VWH.  
The inlet pipe on the back of the cabinet is 3" for the 199 VWH and 4" for the 399 VWH. It is very  
important that you plan the location properly to eliminate long pipe runs and excessive fittings. Inlet  
pipe size must not be reduced. Do not combine the inlet air with any other inlet pipe including an  
inlet to an additional similar appliance. The joints must be properly cleaned, primed and cemented.  
The piping must also be properly supported as per Local and National Standard Plumbing Codes. It  
is important that the piping must be clean and free from burrs, debris, ragged ends and particles of  
PVC.  
Exhaust piping should be sloped back to the connection on the Munchkin, at least ¼" per foot to  
remove additional condensate that forms within the pipe. The total combined length of pipe (intake  
piping plus exhaust piping added together) including elbow allowances for intake and exhaust (each  
elbow = 5' of pipe) should not exceed 85'. The combined vent length should not be less than a com-  
bined length of 6' plus two 90 degree elbows. Choose your vent termination locations carefully. You  
must also make certain that exhaust gas does not re-circulate back into the intake pipe. You must  
place them in an open area and follow the guidelines below.  
1) Never vent into a walkway, patio area, alley or otherwise public area less than 7' from the  
ground. (See detail below references Fig. A.10.8 in the National Fuel Gas Code 2002 “Exit  
Terminals of Mechanical Draft and Direct-Venting Systems”.)  
2) Never vent over or under a window or over a doorway where the exhaust plume or conden-  
sation liquid will cause obtrusive or dangerous conditions. (Or refer to National Fuel Gas  
Code, CAN B149)  
3) Never install a heat saver or similar product to capture waste heat from exhaust.  
4) Always have a vent location at least 1' above maximum snow level.  
5) Always have vent 1' above ground level, away from shrubs and bushes.  
6) Follow local gas codes in your region or refer to National Fuel Gas Code, Can B149.  
7) Always have at least 3' from an inside corner of outside walls, including roof overhang.  
8) Maintain at least 4’ clearance to electric, gas meters, windows, exhaust fans, chimneys, inlets  
or mechanical vents.  
9) Very Important! The inlet air connection must be connected to outside air and should be  
located no closer than 8” to the exhaust and no further than 36”.  
10) Always place screens in all openings in intake and exhaust to prevent foreign matter from  
entering the Munchkin.  
11) The vent intake and exhaust must be properly cleaned and glued for a pressure tight joint.  
Several methods for venting the Munchkin can be found in Figures 4-1 thru 4-6 in this sec-  
tion. Use these layouts as guidelines: certain site conditions such as multiple roof lines/pitch-  
es may require venting modifications (consult factory). The air inlet must be a minimum of 1’  
vertically above the maximum snow level. It is very important that there are no other vents,  
chimneys or air inlets in any direction for at least 4’.  
13  
VENTING  
RECOMMENDED VENTING CLEARANCES PER THE NATIONAL FUEL GAS CODE*  
Mechanical  
draft vent  
terminal  
(see 10.8.1)*  
Mechanical draft  
vent terminal  
(see 10.8.2)*  
C
4 ft.minimum  
Less  
than 10 ft.  
12 in.minimum  
*IMPORTANT NOTE  
HEAT TRANSFER  
PRODUCTS  
RECOMMENDS A  
MINIMUM  
CLEARANCE OF 4  
FEET WHERE THE  
PLUME CAUSED BY  
THE UNIT MAY  
3 ft.minimum  
Direct vent terminal clearance  
Minimum clearance, C  
Input (Btu/hr)  
10,000 or less  
10,001 to 50,000  
Over 50,000  
Clearance (in.)  
6
9
12  
Forced air  
inlet  
(see 10.8.3)*  
OBSTRUCT VIEWS  
OR AFFECT THE  
COSMETIC LOOK OF  
THE BUILDING.  
For SI units: 1 ft = 0.305 m; 1 in. = 25.4 mm;  
1 Btu/hr = 0.293 W  
EXIT TERMINALS OF MECHANICAL DRAFT AND DIRECT-VENT VENTING SYSTEM  
* REFERENCE: THE NATIONAL FUEL GAS CODE 2002 EDITION  
CAUTION  
Flue Gas will condense as it exits the vent termination. This condensate can freeze on  
exterior building surfaces which may cause discoloration of these surfaces.  
Consideration should be given to the plume of condensation that exits the exhaust  
which may affect the cosmetic appearance of the building.  
All venting must be properly supported. The Munchkin is not intended to support any venting  
whatsoever. All piping, glue, solvents, cleaners, fittings and components, must conform to ASTM  
(American Society for Testing and Materials), and ANSI (American National Standards Institute). It is  
recommended that you use one of the optional vent kits specifically designed for Munchkin installa-  
tions, available from Heat Transfer Products, Inc.  
Example: Installation requires the following material for both inlet and exhaust piping for the  
Munchkin 199VWH and the 399VWH.  
Required: 4 Pcs. 90 degree elbow (4 x 5 = 20 Equivalent Feet) = 20 Equivalent Feet  
Required: 20' of Plastic PVC Pipe (20 x 1 = 20 Equivalent Feet) = 20 Equivalent Feet  
Total Friction Loss in Equivalent Feet (20 + 20 = 40 Equivalent Feet) = 40 Equivalent Feet  
C. LONGER VENT RUNS  
NOTICE  
Do not exceed the 125 foot maximum requirement for (intake plus exhaust piping  
added together). Consider fitting allowance shown in friction loss equivalent table on  
the following page.  
14  
VENTING  
WARNING  
Transitioning into a larger diameter pipe should be done in the Vertical position to  
avoid condensation blockage. If done in the horizontal position check to make sure  
condensation blockage will not occur.  
The connection of air inlet and exhaust vent at the heater must remain 3” for 199VWH and 4” for  
399VWH and each vent must extend from the heater a minimum of 15 equivalent feet before transi-  
tioning to a 4” vent for the 199VWH and 6” vent for the 399VWH. The overall extended maximum  
length of pipe on the inlet and exhaust combined, must not exceed 125 equivalent feet. Listed below  
are the 3”, 4” and 6” size equivalent table.  
Friction Loss Equivalent in Piping and Fittings  
Fittings or Piping  
90 degree elbow  
45 degree elbow  
Coupling  
air inlet tee  
Plastic Pipe  
Equivalent Feet  
=
=
=
=
=
=
=
5
3
0
0
1
3
0
concentric vent kit  
vent kit  
Example: Installation requires the following material for both the inlet and exhaust piping when  
extending the vent run for the Munchkin 199VWH.  
3" Vented Appliance  
2 Pcs. – 3" 90 degree elbow (2 x 5 = 10 Equivalent Feet) = 10 Equivalent Feet  
20' of 3" Plastic PVC Pipe  
(20 x 1 = 20 Equivalent Feet) = 20 Equivalent Feet  
Total of 3" Equivalent Piping with Fittings  
= 30 Equivalent Feet  
Requirements for 4" Venting  
6 Pcs. – 4" 90 degree elbows (6 x 3 = 18 Equivalent Feet) = 18 Equivalent Feet  
4 Pcs. – 4" 45 degree elbows (4 x 1 = 4 Equivalent Feet) 4 Equivalent Feet  
40' of 4" Plastic PVC Pipe (40 x 1 = 40 Equivalent Feet) = 40 Equivalent Feet  
Total of 4" Equivalent Piping with Fittings = 62 Equivalent Feet  
=
Total Friction Loss in Equivalent Feet for both 3" and 4" (30 + 62 = 92  
Equivalent Feet) = 92 Equivalent Feet  
DANGER  
The Munchkin is not intended to be common vented with any other  
existing appliance!  
D. HEATER REMOVAL FROM A COMMON VENT SYSTEM  
At the time of removal of an existing heater, the following steps shall be followed with each appli-  
ance remaining connected to the common venting system placed in operation, while the other appli-  
ances remaining connected to common venting system are not operating.  
1. Seal any unused openings in the common venting system.  
2. Visually inspect the venting system for proper size and horizontal pitch to determine if there  
is blockage, leakage, corrosion or other deficiencies that could cause an unsafe condition.  
15  
VENTING  
3. If practical, close all building doors, windows and all doors between the space in which the  
appliance remains connected to the common venting system located and other spaces in the  
building. Turn on clothes dryers and any appliances not connected to the common venting  
system. Turn on any exhaust fans, such as range hoods and bathroom exhausts, at maximum  
speed. Do not operate a summer exhaust fan. Close all fireplace dampers.  
4. Place in operation the appliance being inspected. Follow the lighting instructions. Adjust the  
thermostat so the appliance will operate continuously.  
5. Test for spillage at the draft hood relief opening after 5 minutes of main burner operation. Use  
the flame of a match or candle or smoke from a cigarette.  
6. After it has been determined that each appliance remaining connected to common venting  
system properly vents when tested as outlined, return doors, windows, exhaust fans, fire-  
place dampers and any other gas burning appliance to their previous condition of use.  
7. Any improper operation of the common venting system should be corrected so the installa-  
tion conforms with the National Fuel Gas Code, ANSI Z223.1. When resizing any portion of  
the common venting system, the common venting system should be resized to approach the  
minimum size as determined using the appropriate tables in Appendix G in the National Fuel  
Gas Code , ANSI Z 223.1  
E. CONDENSATE REMOVAL  
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 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 available from Heat Transfer Products, Inc.) A  
condensate filter, if required by local authorities, can be made up of lime crystals, marble or phos-  
phate chips will neutralize the condensate. This can be done in the field by the installer or you may  
purchase one from Heat Transfer Products, Inc. It is also very important that the condensate line is  
not exposed to freezing temperatures, or any other type of blockage. Plastic tubing should 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. An increase to 1” tubing may be necessary.  
16  
VENTING  
DIAGRAMS FOR SIDEWALL VENTING  
Figure 4-2: Sidewall Vent with Tee (Intake) &  
Coupling (Exhaust) for standard floor  
units  
Figure 4-1: Sidewall Vent with Tee (Intake) &  
Coupling (Exhaust) for standard floor  
units  
3” piping for 199VWH  
4” piping for 399VWH  
3” piping for 199VWH  
4” piping for 399VWH  
**IMPORTANT NOTE: All vent pipes must be glued, prop-  
erly supported and the exhaust must be pitched a mini-  
mum of a ¼" per foot back to the boiler (to allow drainage  
of condensate). Always increase pipe in vertical position.  
Never increase pipe size in horizontal position.  
**IMPORTANT NOTE: All vent pipes must be glued, prop-  
erly supported and the exhaust must be pitched a mini-  
mum of a ¼" per foot back to the boiler (to allow drainage  
of condensate). Always increase pipe in vertical position.  
Never increase pipe size in horizontal position.  
Figure 4-3: Sidewall Vent with V1000 or V2000 kit  
for standard floor units  
Figure 4-4: Sidewall Vent with 4” concentric vent  
kit (KGAVT0601CVT) for standard floor  
units  
3” piping for 199VWH  
4” piping for 399VWH  
3” piping for 199VWH  
4” piping for 399VWH  
**IMPORTANT NOTE: All vent pipes must be glued, prop-  
erly supported and the exhaust must be pitched a mini-  
mum of a ¼" per foot back to the boiler (to allow drainage  
of condensate). Always increase pipe in vertical position.  
Never increase pipe size in horizontal position.  
**IMPORTANT NOTE: All vent pipes must be glued, prop-  
erly supported and the exhaust must be pitched a mini-  
mum of a ¼" per foot back to the boiler (to allow drainage  
of condensate). Always increase pipe in vertical position.  
Never increase pipe size in horizontal position.  
17  
VENTING  
DIAGRAMS FOR VERTICAL VENTING  
Figure 4-6: Roof Vent with 3” concentric vent kit  
(KGAVT0601CVT) for standard floor  
units  
Figure 4-5: Roof Vent with tee (intake) & coupling  
(exhaust) for standard floor units  
3” piping for 199VWH  
4” piping for 399VWH  
3” piping for 199VWH  
4” piping for 399VWH  
**IMPORTANT NOTE: All vent pipes must be glued, prop-  
erly supported and the exhaust must be pitched a mini-  
mum of a ¼" per foot back to the boiler (to allow drainage  
of condensate). Always increase pipe in vertical position.  
Never increase pipe size in horizontal position.  
**IMPORTANT NOTE: All vent pipes must be glued, prop-  
erly supported and the exhaust must be pitched a mini-  
mum of a ¼" per foot back to the boiler (to allow drainage  
of condensate). Always increase pipe in vertical position.  
Never increase pipe size in horizontal position.  
18  
PIPING  
PART 5. PIPING THE MUNCHKIN VWH TO THE STORAGE TANK  
WARNING  
When raising tank temperature, you increase the risk of scalding – Please use a water  
tempering or mixing valve and extreme caution. Consult codes for conformance.  
WARNING  
Plumbing of this product should only be done by a qualified, licensed plumber in  
accordance with all local plumbing codes.  
The Munchkin is designed to be connected to a storage tank to supply domestic hot water. Heat  
Transfer Products has available storage tanks that are 80/119 gallon size storage tanks constructed in  
either Stainless Steel or Glass lined construction. These storage tanks will be directly connected to the  
Munchkin VWH supply and return connection. Connect the cold water supply to both the storage  
bottom port and the supply side of the Munchkin VWH (shown in Piping details, this section) It is  
important that you install a flow check on the supply line of Munchkin VWH before you connect feed  
line to the storage. This will allow the cold feed to flow through the storage tank first and not the  
Munchkin VWH. It is recommended that you install shut off valves on the cold feed line for ease of  
future service. If there is a back flow preventer, or any type of no return valve in the system, then you  
must install an additional tee for a suitable potable hot water expansion tank. Connect the Storage tank  
return line to the return connection located on the Munchkin VWH (shown in Piping details, this  
section). Then connect your hot water outlet located on the storage tank to your hot water plumbing  
lines.  
WARNING  
NEVER USE DIELECTRIC UNIONS OR GALVANIZED STEEL FITTINGS WHEN  
CONNECTING TO A STAINLESS STEEL STORAGE TANK.  
A. EXPANSION TANK  
A potable hot water expansion tank my be required to offset the water expansion as the water is  
heated. In most city plumbing systems, the water meter has a no return or back flow device built into  
the system to prevent a back flow of water back into city mains. Some states require back flow pre-  
venters on all incoming water supplies. Under these circumstances, you will need a hot water expan-  
sion tank listed for potable water use. The expansion tank should be located on the cold inlet piping  
close to the water heater. It is important that you follow the expansion tank manufacturer’s installa-  
tion guidelines when installing any expansion tank.  
See the piping illustrations included in this section, Figs. 5-2 to 5-9 for suggested guidelines in  
piping the Munchkin heater with either zone valves or circulator pumps.  
*Please note that these illustrations are meant to show system piping concept only, the installer  
is responsible for all equipment and detailing required by local codes.  
B. HIGH VELOCITY CIRCULATOR PUMP  
Every Munchkin VWH is shipped with a high velocity circulating pump to assure the correct amount  
of continuous flow through the all stainless steel heat exchanger at all times. If a replacement of the  
high velocity circulator pump is needed, it must match the performance of the pump provided with  
the Munchkin VWH package. NOTE: The circulator must be designed for potable water systems.  
19  
PIPING  
PIPING ILLUSTRATIONS  
Piping Symbol Legend  
anti-scald rated  
mixing valve  
circulator (open loop)  
(w/ isolation flanges)  
flow switch  
gate valve  
pressure gauge  
pressure relief valve  
(or P&T relief valve)  
globe valve  
ball valve  
temperature /  
pressure gauge  
T/P  
swing-check valve  
union  
spring-loaded check valve  
vacuum breaker  
hose bib / boiler drain  
diaphragm-type  
expansion tank  
(for potable water)  
Superstor Ultra  
Storage Tank  
Munchkin heater  
Fig. 5-1  
20  
PIPING  
Drawing VWH 1/1  
Volume Water Heating  
using Munchkin boiler  
(1 boiler supplying one storage tank)  
ASEE 1017 rated anti-scald valve  
(recommended)  
vacuum breaker  
(where required by code)  
constant  
circulation  
flow switch  
expansion  
Superstor Ultra  
Storage Tank  
tank  
condensate  
drainage  
NOTES:  
1.  
This drawing is meant to show system piping concept only.  
Installer is responsible for all equipment & detailing required by local codes.  
Boiler circulator must be rated for open loop application. Do not use cast-iron circulators  
Boiler circulator(s) operate continuously  
2.  
3.  
4.  
5.  
6.  
The minimum pipe size for connecting to a water storage tank is 1 inch.  
The minimum pipe size for connecting a Munchkin boiler is 1.25 inches for 199 VWH, and 2-inches for 399 VWH  
All pumps are shown with isolation flanges or full port ball valves for isolation. The alternative is standard flanges  
with full port ball valves and a separate flow check valve.  
7.  
Install a minimum of 12 diameters of straight pipe upstream of all circulators and check valves.  
Install vacuum relief valve in accordance with local code requirements  
All multiple boilers and multiple storage tanks shall be installed with reverse return piping as shown  
Anti-scald rated mixing valve is recommended on all tanks if the leaving hot water temperature from tank is above 119 ˚F.  
Expansion tank must be rated for use with potable water  
8.  
9.  
10.  
11.  
Fig. 5-2  
21  
PIPING  
Drawing VWH 1/2  
Volume Water Heating  
using Munchkin boiler  
(1 boiler supplying two storage tanks)  
ASEE 1017 rated anti-scald valve  
(recommended)  
vacuum breaker  
(where required by code)  
constant  
circulation  
expansion  
tank  
flow switch  
Superstor Ultra  
Storage Tank  
Superstor Ultra  
Storage Tank  
condensate  
drainage  
NOTES:  
1.  
This drawing is meant to show system piping concept only.  
Installer is responsible for all equipment & detailing required by local codes.  
Boiler circulator must be rated for open loop application. Do not use cast-iron circulators  
Boiler circulator(s) operate continuously  
2.  
3.  
4.  
5.  
6.  
The minimum pipe size for connecting to a water storage tank is 1 inch.  
The minimum pipe size for connecting a Munchkin boiler is 1.25 inches for 199 VWH, and 2-inches for 399 VWH  
All pumps are shown with isolation flanges or full port ball valves for isolation. The alternative is standard flanges  
with full port ball valves and a separate flow check valve.  
Install a minimum of 12 diameters of straight pipe upstream of all circulators and check valves.  
Install vacuum relief valve in accordance with local code requirements  
All multiple boilers and multiple storage tanks shall be installed with reverse return piping as shown  
Anti-scald rated mixing valve is recommended on all tanks if the leaving hot water temperature from tank is above 119 ˚F.  
Expansion tank must be rated for use with potable water  
7.  
8.  
9.  
10.  
11.  
Fig. 5-3  
22  
PIPING  
Drawing VWH 2/1 H  
Volume Water Heating  
using Munchkin boiler  
(2 boilers supplying one storage tank)  
ASEE 1017 rated anti-scald valve  
(recommended)  
vacuum breaker  
(where required by code)  
constant  
constant  
circulation  
circulation  
flow switch  
Munchkin 1  
Munchkin 2  
Superstor Ultra  
Storage Tank  
expansion  
tank  
condensate  
drainage  
NOTES:  
1.  
This drawing is meant to show system piping concept only.  
Installer is responsible for all equipment & detailing required by local codes.  
Boiler circulator must be rated for open loop application. Do not use cast-iron circulators  
Boiler circulator(s) operate continuously  
2.  
3.  
4.  
5.  
6.  
The minimum pipe size for connecting to a water storage tank is 1 inch.  
The minimum pipe size for connecting a Munchkin boiler is 1.25 inches for 199 VWH, and 2-inches for 399 VWH  
All pumps are shown with isolation flanges or full port ball valves for isolation. The alternative is standard flanges  
with full port ball valves and a separate flow check valve.  
Install a minimum of 12 diameters of straight pipe upstream of all circulators and check valves.  
Install vacuum relief valve in accordance with local code requirements  
All multiple boilers and multiple storage tanks shall be installed with reverse return piping as shown  
Anti-scald rated mixing valve is recommended on all tanks if the leaving hot water temperature from tank is above 119 ˚F.  
Expansion tank must be rated for use with potable water  
7.  
8.  
9.  
10.  
11.  
Fig. 5-4  
23  
PIPING  
Drawing VWH 2/1 V  
Volume Water Heating  
using Munchkin boiler  
(2 boilers supplying one storage tank)  
ASEE 1017 rated anti-scald valve  
(recommended)  
constant  
vacuum breaker  
circulation  
(where required by code)  
flow switch  
Munchkin 1  
constant  
circulation  
flow switch  
Munchkin 2  
Superstor Ultra  
Storage Tank  
expansion  
tank  
condensate  
drainage  
NOTES:  
1.  
This drawing is meant to show system piping concept only.  
Installer is responsible for all equipment & detailing required by local codes.  
2.  
3.  
4.  
5.  
6.  
Boiler circulator must be rated for open loop application. Do not use cast-iron circulators  
Boiler circulator(s) operate continuously  
The minimum pipe size for connecting to a water storage tank is 1 inch.  
The minimum pipe size for connecting a Munchkin boiler is 1.25 inches for 199 VWH, and 2-inches for 399 VWH  
All pumps are shown with isolation flanges or full port ball valves for isolation. The alternative is standard flanges  
with full port ball valves and a separate flow check valve.  
Install a minimum of 12 diameters of straight pipe upstream of all circulators and check valves.  
Install vacuum relief valve in accordance with local code requirements  
All multiple boilers and multiple storage tanks shall be installed with reverse return piping as shown  
Anti-scald rated mixing valve is recommended on all tanks if the leaving hot water temperature from tank is above 119 ˚F.  
Expansion tank must be rated for use with potable water  
7.  
8.  
9.  
10.  
11.  
Fig. 5-5  
24  
PIPING  
Drawing VWH2/2 H  
Volume Water Heating  
using Munchkin boilers  
(2 boilers supplying two storage tanks)  
ASEE 1017 rated anti-scald valve  
(recommended)  
vacuum breaker  
(where required by code)  
constant  
constant  
circulation  
circulation  
expansion  
tank  
flow  
flow  
switch  
switch  
Superstor Ultra  
Storage Tank  
Superstor Ultra  
StorageTank  
Munchkin 1  
Munchkin 2  
condensate  
drainage  
NOTES:  
1.  
This drawing is meant to show system piping concept only.  
Installer is responsible for all equipment & detailing required by local codes.  
2.  
3.  
4.  
5.  
6.  
Boiler circulator must be rated for open loop application. Do not use cast-iron circulators  
Boiler circulator(s) operate continuously  
The minimum pipe size for connecting to a water storage tank is 1 inch.  
The minimum pipe size for connecting a Munchkin boiler is 1.25 inches for 199 VWH, and 2-inches for 399 VWH  
All pumps are shown with isolation flanges or full port ball valves for isolation. The alternative is standard flanges  
with full port ball valves and a separate flow check valve.  
Install a minimum of 12 diameters of straight pipe upstream of all circulators and check valves.  
Install vacuum relief valve in accordance with local code requirements  
All multiple boilers and multiple storage tanks shall be installed with reverse return piping as shown  
7.  
8.  
9.  
10. Anti-scald rated mixing valve is recommended on all tanks if the leaving hot water temperature from tank is above 119 ˚F.  
11. Expansion tank must be rated for use with potable water  
Fig. 5-6  
25  
PIPING  
Drawing VWH2/2 V  
Volume Water Heating  
using Munchkin boilers  
(2 boilers supplying two storage tanks)  
ASEE 1017 rated anti-scald valve  
(recommended)  
constant  
circulation  
vacuum breaker  
(where required by code)  
flow switch  
Munchkin 1  
constant  
circulation  
expansion  
tank  
flow switch  
Munchkin 2  
Superstor Ultra  
Storage Tank  
Superstor Ultra  
Storage Tank  
condensate  
drainage  
NOTES:  
This drawing is meant to show system piping concept only.  
Installer is responsible for all equipment & detailing required by local codes.  
1.  
2.  
3.  
4.  
5.  
6.  
Boiler circulator must be rated for open loop application. Do not use cast-iron circulators  
Boiler circulator(s) operate continuously  
The minimum pipe size for connecting to a water storage tank is 1 inch.  
The minimum pipe size for connecting a Munchkin boiler is 1.25 inches for 199 VWH, and 2-inches for 399 VWH  
All pumps are shown with isolation flanges or full port ball valves for isolation. The alternative is standard flanges  
with full port ball valves and a separate flow check valve.  
Install a minimum of 12 diameters of straight pipe upstream of all circulators and check valves.  
Install vacuum relief valve in accordance with local code requirements  
All multiple boilers and multiple storage tanks shall be installed with reverse return piping as shown  
7.  
8.  
9.  
10. Anti-scald rated mixing valve is recommended on all tanks if the leaving hot water temperature from tank is above 119 ˚F.  
11. Expansion tank must be rated for use with potable water  
Fig. 5-7  
26  
PIPING  
Drawing VWH 3/2 H  
Volume Water Heating  
using Munchkin boiler  
(3 boilers supplying two storage tanks)  
ASEE 1017 rated anti-scald valve  
(recommended)  
vacuum breaker  
(where required by code)  
constant  
circulation  
constant  
circulation  
constant  
circulation  
expansion  
tank  
flow  
flow  
flow  
switch  
switch  
switch  
Munchkin 1  
Munchkin 2  
Munchkin 3  
Superstor Ultra  
Storage Tank  
Superstor Ultra  
Storage Tank  
condensate  
drainage  
NOTES:  
This drawing is meant to show system piping concept only.  
1.  
Installer is responsible for all equipment & detailing required by local codes.  
2. Boiler circulator must be rated for open loop application. Do not use cast-iron circulators  
3. Boiler circulator(s) operate continuously  
The minimum pipe size for connecting to a water storage tank is 1 inch.  
4.  
5.  
The minimum pipe size for connecting a Munchkin boiler is 1.25 inches for 199 VWH, and 2-inches for 399 VWH  
6. All pumps are shown with isolation flanges or full port ball valves for isolation. The alternative is standard flanges  
with full port ball valves and a separate flow check valve.  
Install a minimum of 12 diameters of straight pipe upstream of all circulators and check valves.  
Install vacuum relief valve in accordance with local code requirements  
7.  
8.  
9. All multiple boilers and multiple storage tanks shall be installed with reverse return piping as shown  
10. Anti-scald rated mixing valve is recommended on all tanks if the leaving hot water temperature from tank is above 119 ˚F.  
11. Expansion tank must be rated for use with potable water  
Fig. 5-8  
27  
PIPING  
Drawing VWH 3/2 V  
Volume Water Heating  
using Munchkin boiler  
(3 boilers supplying two storage tanks)  
constant  
circulation  
flow switch  
ASEE 1017 rated anti-scald valve  
(recommended)  
Munchkin 1  
Munchkin 2  
Munchkin 3  
constant  
vacuum breaker  
circulation  
(where required by code)  
flow switch  
constant  
circulation  
expansion  
tank  
flow switch  
Superstor Ultra  
Storage Tank  
Superstor Ultra  
Storage Tank  
condensate  
drainage  
NOTES:  
This drawing is meant to show system piping concept only.  
1.  
Installer is responsible for all equipment & detailing required by local codes.  
Boiler circulator must be rated for open loop application. Do not use cast-iron circulators  
Boiler circulator(s) operate continuously  
2.  
3.  
4.  
5.  
6.  
The minimum pipe size for connecting to a water storage tank is 1 inch.  
The minimum pipe size for connecting a Munchkin boiler is 1.25 inches for 199 VWH, and 2-inches for 399 VWH  
All pumps are shown with isolation flanges or full port ball valves for isolation. The alternative is standard flanges  
with full port ball valves and a separate flow check valve.  
Install a minimum of 12 diameters of straight pipe upstream of all circulators and check valves.  
Install vacuum relief valve in accordance with local code requirements  
All multiple boilers and multiple storage tanks shall be installed with reverse return piping as shown  
Anti-scald rated mixing valve is recommended on all tanks if the leaving hot water temperature from tank is above 119 ˚F.  
Expansion tank must be rated for use with potable water  
7.  
8.  
9.  
10.  
11.  
Fig. 5-9  
28  
START-UP PROCEDURES  
PART 6. START-UP PROCEDURES  
A. SEQUENCE OF OPERATION  
1. When power is first applied to the control, the control display will read the outlet tempera-  
ture. The control will initially run through a self-diagnostic routine and then go into its oper-  
ating mode. If there is no call for heat, the System will go into an idle state. The circulator  
must be wired to incoming power to operate continuously. If there is a code FL in the dis-  
play window, then either the circulator is not operating or there is a restriction in the piping  
system, rendering an inadequate flow.  
2. The control then performs selected system diagnostic checks. If all checks are successfully  
passed, a pre-purge cycle is initiated (the blower will be on maximum speed).  
3. When the actual temperature is below a set-point, minus the switching differential, the burn-  
er will operate and modulate to heat the system.  
4. When the pre-purge period is complete, power is applied to the spark ignitor for approxi-  
mately 6 seconds. Approximately 2 seconds later, we verify flame. If a flame is not verified  
during the trial-for-ignition, the gas valve is immediately closed and the control will return to  
step 2. After three trials, if a flame is not verified, the control will go into a lockout mode. If a  
flame is confirmed, the control enters the heating mode. The fire rate will be based on the  
proprietary algorithm.  
5. When water temperature reaches the temperature set point, the gas valve is closed and the  
control enters a post-purge state (the blower will be on maximum speed).  
6. When the post-purge is complete, the control enters an idle state while continuing to moni-  
tor temperature and the state of other system devices. If a call-for-heat is received, the con-  
trol will automatically return to step 2 in sequence and repeat the entire operating cycle.  
B. ITEMS TO BE CHECKED BEFORE LIGHTING THE MUNCHKIN  
It is recommended that you read the General Information Section (Part 1) to get a better under-  
standing how the Munchkin operates before you start the unit.  
1. Make sure that you follow the Lighting instruction before running the Munchkin.  
2. Check to see if all the electrical connections are on securely.  
3. Make sure that the Gas is turned on inside the cabinet and outside of the Munchkin.  
4. Double check the temperature setting (Note: The Munchkin is factory set at 119 degrees)  
5. Make sure the unit is properly grounded and the electrical wiring meets the requirements of  
the electrical section (Part 2).  
6. Turn on the power to the Munchkin. The Temperature of the Munchkin Outlet will appear in  
the display provided. If a fault code appears, correct the fault before operating. Make sure that  
the flow switch is connected and adjust the setpoint for the desired water temperature. The  
Munchkin will now run its pre-purge cycle, then begin running, which will be indicated by the  
Green light illuminating under “Flame On” in your display.  
WARNING  
If you do not follow these instructions exactly, a fire or explosion may  
result, causing property damage, personal injury or loss of life.  
29  
START-UP PROCEDURES  
C. LIGHTING INSTRUCTIONS  
FOR YOUR OWN SAFETY READ BEFORE OPERATING  
1. This appliance does not have pilot. It is equipped with an ignition device which automatical-  
ly lights the burner. Do not try to light the burner by hand.  
2. BEFORE OPERATING smell all around the appliance area for gas. Be sure to smell next to the  
floor because some gas is heavier than air and will settle on the floor.  
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.  
3. Turn on gas shutoff valve (located inside of the Heater) so that the handle is aligned with the  
gas pipe. If the handle will not turn by hand, don't try to repair it, call a qualified service tech-  
nician. Force or attempted repair may result in a fire or explosion.  
4. Do not use this appliance if any part has been under water. Immediately call a qualified serv-  
ice technician to inspect the appliance and to replace any part of the control system and any  
gas control which has been under water.  
5. The Munchkin Heater shall be installed so the gas ignition system components are protected  
from water (dripping, spraying, rain, etc.) during appliance operation and service (circulator  
replacement, condensate trap, control replacement, etc.)  
D. OPERATING INSTRUCTIONS  
1. STOP! Read the safety information in Part 6.  
2. Turn off all electric power to the appliance.  
3. This appliance is equipped with an ignition device which automatically lights the burner. Do  
not try to light the burner by hand.  
4. Remove front cover.  
5. Turn gas shutoff valve to “off” position.  
6. Wait five (5) minutes to clear out any gas. If you then smell gas, STOP! Follow Part 6, Section  
B/Lighting Instructions in the safety information. If you don't smell gas, go to the next step.  
7. Turn the gas shutoff valve to “on” position.  
8. Replace the Front Cover.  
9. Turn on all electric power to appliance.  
10. Set the temperature to the desired setting.  
11. If the appliance will not operate, follow the instructions “To Turn Off Gas To Appliance”  
Section E and call your service technician or gas supplier.  
E. ADJUSTING THE OPERATING SET POINTS OF THE MUNCHKIN VWH DISPLAY  
To adjust a set point value on the Munchkin VWH, Simply press the S3/Program key for three sec-  
onds until you see dd then an alternating value of 119° F. This will be your first function. To advance  
to the next function, simply press the S3/program (see set point adjustment chart on next page).  
Any function setting may be changed by pressing either the S1/- or the S2/+ key on the display.  
After advancing through the function, press the S3/Program key, this will bring you back to normal  
operation, displaying the output temperature of the Munchkin VWH.  
30  
START-UP PROCEDURES  
Set Point Adjustment  
Function  
Display  
Default Setting  
119° F  
Range of Adjustment  
95° F/185° F  
1–18° F  
Temperature Set Point  
Differential Set Point  
Temp. Measurement  
dd  
dh  
t
8° F  
Fahrenheit to Celcius  
F or C  
DANGER  
Water temperature over 125 degrees F. can cause severe burns  
instantly, or death from scalds. Children, disabled, and elderly  
are at highest risk of being scalded. See instruction manual  
before setting temperature at water heater. Feel water before  
bathing or showering! Temperature limiting valves are available.  
F. STATUS MENU  
Installers are also able to check the current status of the Munchkin parameters by pressing S4/Reset  
key for 3 seconds. Once activated, the display will show d1 alternating value of the actual outlet tem-  
perature. Actual values are displayed for each function. To view the next value simply press the S/4  
key to go to the next displayed value. Listed below are the values which can be displayed. These val-  
ues cannot be changed. To exit this menu, simply press S3/Program key to resume normal operation.  
Function Value  
d1/  
d2/  
d3/  
d4/  
d5/  
d6/  
Actual Temperature from outlet sensor  
Actual Temperature from inlet sensor  
N/A  
N/A  
N/A  
Actual Fan speed multiplied by 10 (example: If fan speed displayed is  
410 RPM x 10 = 4100 actual fan speed)  
d7/  
Actual Ionization current read from Flame Rectification probe  
d8/  
N/A  
d9/  
N/A  
d10/  
d11/  
d12/  
N/A  
N/A  
power on in 1,000 units 100 hrs = 0.1 / 1,000 hrs = 1.0  
3,000 hrs = 3.0  
d13/  
d14/  
d15/  
N/A  
Total Running Hours in 1,000 units  
Total number of ignition cycles in 1,000 units.  
G. TEST MODE  
This function is intended to simplify the gas valve adjustment if needed. Listed below are the  
recommended limits on each Munchkin Heater and the Combustion Settings. Automatic modulation  
does not take place when the controller is in Test mode, only temperature limitation based on the  
Munchkin Central Heating set point. The user will be allowed to increase or decrease the fan speed  
by pressing in either the S1/- or S2/+ keys.  
To activate the Test mode simply press the S2/+ and S3/Program key together for 1 second. Once  
activated, you will see in the display Ser and the actual fan speed. The measurement of the  
combustion levels should always be taken at the highest and lowest fan speed. After 10 minutes, the  
Test mode stops automatically. To exit Test Mode press S1/- and S2/+ key together for 1 second.  
31  
START-UP PROCEDURES  
COMBUSTION SETTINGS — 199VWH / 399 VWH  
HIGH FIRING RATES and LOW FIRING RATES ON ALL MODELS  
Natural Gas Propane LP  
low  
high  
low  
high  
Carbon CO ppm  
Monoxide  
Carbon CO 2%  
Dioxide  
0–20 ppm  
70 ppm–135 ppm  
8-1/2% – 9-1/2%  
0–20 ppm  
70–150 ppm  
8-1/2% – 9-1/2%  
9-1/2% – 10-1/2%  
9-1/2% – 10-1/2%  
Fig. 6-1  
H. TO TURN OFF GAS TO APPLIANCE  
1. Set the thermostat to lowest setting.  
2. Turn off all electric power to the appliance if service is to be performed.  
3. Remove the front cover.  
4. Turn gas shutoff valve to "off".  
5. Install front cover.  
DANGER  
Water temperature over 125 degrees F. can cause severe burns  
instantly, or death from scalds. Children, disabled, and elderly  
are at highest risk of being scalded. See instruction manual  
before setting temperature at water heater. Feel water before  
bathing or showering! Temperature limiting valves are available.  
32  
START-UP PROCEDURES  
MUNCHKIN 199VWH GAS VALVE  
THROTTLE ADJUSTER  
(NOTE: IF FOR ANY  
REASON THE THROTTLE  
NEEDS TO BE  
ADJUSTED  
VERY IMPORTANT THAT  
A "COMBUSTION  
,
IT IS  
ANAYLYZER" BE USED  
TO ENSURE SAFE AND  
PROPER OPERATION.  
TURN THE ADJUSTER  
TO THE (+) TO  
INCREASE GAS OR THE  
(-) TO DECREASE THE  
GAS SUPPLY. THIS  
ADJUSTMENT COULD  
AFFECT CO/CO%  
LEVELS. MAKE SURE  
THE LEVELS  
CORRESPOND TO THE  
CHART IN COMBUSTION  
SETTINGS.)  
Fig. 6-2  
MUNCHKIN 399VWH GAS VALVE  
Fig. 6-3  
33  
TROUBLESHOOTING  
PART 7. TROUBLESHOOTING  
A. MUNCHKIN ERROR CODE  
WARNING  
An error code may occur in the installation of the  
Munchkin VWH. This condition may lead to a lock out  
condition of the controller, which will need to be  
manually reset through the S4/Reset button. These  
temporary codes will help the installer correct the  
problem before going into a lock out condition,  
which will require a manual reset.  
When servicing or replacing any components of this  
boiler be certain that:  
• The gas is off.  
• All electrical power is disconnected  
DANGER  
When servicing or replacing that are in direct  
contact with the boiler water, be certain that:  
• There is no pressure in the boiler. (Pull the release  
on the relief valve. Do not depend on the pressure  
gauge reading).  
• The boiler water is not hot  
• The electrical power is off  
B. BOILER ERROR  
1. When an error condition occurs the con-  
troller will display an error code on the dis-  
play module.  
2. These error codes and several suggested  
corrective actions are included in Table 7.1.  
WARNING  
Do not use this appliance if any part has been under  
water. Improper or dangerous operation may result.  
Contact a qualified service technician immediately  
to inspect the boiler and to repair or replace any part  
of the boiler which has been under water.  
3. In the case of E00, E13, and E14 this error, if  
uncorrected, will go into a fault condition as  
described is Paragraph C (Boiler Fault).  
C. BOILER FAULT  
1. When a fault condition occurs the controller  
will illuminate the red “fault” indication light  
and display a fault code in the format  
(Example: F00 ) on the display module.  
CAUTION  
This appliance has wire function labels on all  
internal wiring. Observe the position of each wire  
before removing it. Wiring errors may cause  
improper and dangerous operation. Verify proper  
operation after servicing.  
2. Note the fault code and refer to Table 7.2 for  
an explanation of the fault code along with  
several suggestions for corrective actions.  
CAUTION  
3. Press the reset key to clear the fault and  
resume operation. Be sure to observe the  
operation of the unit to prevent a recurrence  
of the fault.  
If overheating occurs or the gas supply fails to shut  
off, do not turn off electrical power to the circulating  
pump. This may aggravate the problem and increase  
the likelihood of boiler damage. Instead, shut off the  
gas supply to the boiler at the gas service valve.  
Table 7-1: 925 Control Board Error Codes  
Code  
Description  
Duration  
Corrective Action  
1. Check circulation pump operation.  
2. Assure that there is adequate flow through the  
boiler by accessing the status menu and assuring  
that there is less than a 50°F rise from the return  
thermister to the supply thermister.  
E00 High Limit Exceeded  
50 Sec.  
3. Replace switch if faulty.  
Combustion Fan Speed Low.  
1. Check the combustion air fan wiring.  
2. Replace the combustion air fan.  
3. Replace the control board.  
1. Check the combustion air fan wiring.  
2. Replace the combustion air fan.  
3. Replace the control board.  
E13 The boiler combustion air fan  
60 Sec.  
60 Sec.  
speed less than 70% of expected.  
Combustion Fan Speed High. The  
E14 boiler combustion air fan speed is  
more than 130% of expected.  
1. Assure that high velocity pump is operational  
2. Check pump impeller  
3. Check flow switch and paddle wheel.  
.
Until  
Corrected  
.
FLO Flow Switch Open  
34  
TROUBLESHOOTING  
Table 7-2: 925 Control Board FAULT Codes  
Code Description  
Remedy  
1. Check circulation pump operation  
2. Assure that there is adequate flow through the boiler by accessing the  
status menu and assuring that there is less than a 50°F rise from the  
return thermister to the supply thermister.  
F00 High Limit Exceeded.  
3. Check thermister reading on supply thermister. Replace switch if faulty.  
1. Push the red reset button on the switch.  
2. Check the flue temperature during operation using a combustion  
analyzer.  
F01 Vent Temperature Limit Exceeded.  
3. Replace the switch if faulty.  
Interrupted or Shorted  
F02  
1. Check the electrical connection to the thermister on the outlet manifold.  
2. Replace thermister if necessary.  
Supply (Outlet) Thermister.  
Interrupted or Shorted  
Return (Inlet) Thermister.  
1. Check the electrical connection to the thermister on the inlet manifold.  
2. Replace thermister if necessary.  
F03  
1. Check circulation pump operation.  
Supply (Outlet)  
F05  
2. Assure that there is adequate flow through the boiler by accessing the  
status menu and assuring that there is less than a 50°F rise from the  
return thermister to the supply thermister.  
Temperature exceeds 230°F.  
1. Check circulation pump operation.  
Return (Inlet) Temperature  
Exceeded 230°F.  
2. Assure that there is adequate flow through the boiler by accessing the  
status menu and assuring that there is less than a 50°F rise from the  
return thermister to the supply thermister.  
F06  
1. Watch the igniter through the observation window provided.  
2. If there is no spark, check the spark electrode for the proper ¼” gap.  
3. Remove any corrosion from the spark electrod and flame rectifier probe.  
4. If there is a spark but no flame, check the gas supply to the boiler.  
5. If there is a flame, check the flame sensor.  
No flame detected – The boiler will  
make three attempts at ignition  
F09  
before the control goes into this  
lockout condition.  
6. Check any flue blockage or condensate blocks.  
1. Monitor the gas pressure to the unit while in operation.  
2. Assure that the flame is stable when lit.  
3. Check to see if the green light on the display module is out while the  
boiler is running.  
4. If the green light doesn’t come on or goes off during operation check  
the flame signal on the status menu.  
5. If the signal reads less than 1 microampere, clean the flame rectifier  
probe.  
6. If the flame rectifier probe continues to read low, replace it.  
Loss of Flame Signal – The boiler  
will relight 4 times before the  
F10  
control goes into this lockout  
condition.  
1. Turn the gas off to the unit at the service valve.  
2. If the flame signal is still present replace the igniter.  
False Flame Signal – The boiler will 3. If the flame signal is not present after turning off the gas supply, check  
F11 lock out if it senses a flame signal the gas valve electrical connection.  
when there should be none present. 4. If there is no power to the gas valve, remove the valve and check for  
obstruction in the valve seat or replace the gas valve.  
5. Turn the gas on at the service valve after corrective action is taken.  
Combustion Fan Speed Low – The  
boiler will lock out if it senses that  
F13 the fan speed is less than 70% of  
expected rate for more than 60  
seconds.  
1. Check the combustion air fan wiring.  
2. Replace the combustion air fan.  
3. Replace the control board.  
Combustion Fan Speed High – The  
1. Check the combustion air fan wiring.  
2. Replace the combustion air fan.  
3. Replace the control board.  
boiler will lock out if the fan speed is  
F14  
more than 130% of expected rate  
for more than 60 seconds.  
1. Make sure the connector is correctly connected to the gas valve.  
2. Check the electrical wiring from the valve to the control board.  
3. Replace the low voltage wiring harness assembly.  
4. Replace control board.  
F18 Gas Valve Error  
F30 Watchdog  
Call factory for further assistance.  
Call factory for further assistance.  
Call factory for further assistance.  
Call factory for further assistance.  
F31 Parameter Memory  
F32 Parameter Memory Write Error  
F33 Programming Error  
35  
TROUBLESHOOTING  
RESISTANCE TABLES  
Resistance (ohms)  
Boiler  
32  
32550  
25340  
19870  
15700  
12490  
10000  
8059  
6535  
5330  
4372  
3605  
2989  
2490  
2084  
1753  
1481  
1256  
1070  
915  
41  
50  
59  
68  
77  
86  
95  
104  
113  
122  
131  
140  
149  
158  
167  
176  
185  
194  
203  
212  
786  
667  
36  
MAINTENANCE  
PART 8. MAINTENANCE  
A. MAINTENANCE PROCEDURES  
Periodic maintenance should be performed once a year by a qualified service technician to assure  
that all the equipment is in safe efficient operation. The owner can make necessary arrangements  
with a qualified heating contractor for periodic maintenance of the heater. Installer must also inform  
the owner that the lack of proper care and maintenance of the heater may result in a hazardous con-  
dition. The installer should discuss the contents of the User's Information Manual with the owner.  
B. ANNUAL MAINTENANCE  
A trained and qualified service technician should perform the inspections listed below at least once  
a year.  
Heater – check the heater for dust or foreign materials, which may have been drawn in from the  
air intake of the heater. Simply blow out or wipe down with a dry rag.  
Vent Termination – check to remove any obstructions, such as leaves, bushes, or other  
sources which may interfere with the units ability to draw fresh air on the air intake or exhaust  
flue gas from the exhaust outlet.  
Vent Piping – make sure that all vent piping is in good condition. Check Joints for possible  
leaks.  
Condensate – check the Condensate trap by simply starting the unit and observing the flow of  
Condensate which should not be restricted in any fashion. (See instructions below.)  
Heat Exchanger – in the unlikely event the heater flue passage is becoming blocked, service  
must be performed only by an authorized Heat Transfer Products Representative or Certified  
Installing Contractor. (See coil cleaning instructions Section D)  
Burner – check burner for deterioration. If deterioration is observed, replace burner.  
System Water / Pressure – check pressure regulator and system pressure. Check system for  
air which will create noise. Open air vents or purge system to bleed air then close once air is fully  
purged from the system.  
Water Piping – check for and repair any leaks.  
Gas Piping – check for and repair any leaks.  
C. CONDENSATE CLEANING INSTRUCTIONS  
1. Turn down the temperature setpoint dd so the Munchkin will not cycle and then follow the steps  
below.  
a. Close gas valve  
b. Disconnect the condensate hose from the outside connection (not from the Munchkin) so  
flow can be observed.  
c. Block the air flow in the exhaust by temporarily plugging the exhaust from the outside vent.  
d. Turn up the temperature set point dd so the Munchkin VWH will begin to cycle. This will  
cause the fan to run at 100% which will then blow out any sediment that has accumulated in  
the condensate line. This process should only take a few minutes.  
e. The unit should now be ready to re-start.  
2. Before re-starting the Munchkin follow the steps below:  
a. Reconnect the Molex connection and un-block the vent (IMPORTANT: MAKE SURE  
EXHAUST VENT IS NO LONGER BLOCKED!)  
b. Open the gas valve.  
c. Hit System Reset and increase the temperature to assure that the VWH will operate.  
d. Observe the boiler function to make sure you see a condensate flow.  
e. If you do not observe a condensate flow, repeat the above procedure.  
3. If the problem is not corrected at this point, it is possible you have a material deposit problem,  
37  
MAINTENANCE  
in which case, a qualified plumber will need to be contacted to follow the Coil Cleaning Instructions  
(Section D) included in this section to dissolve deposit and clean condensate line.  
DANGER  
IT IS EXTREMELY IMPORTANT TO MAKE SURE THE EXHAUST VENT IS NO LONGER  
BLOCKED. FAILURE TO DO SO MAY RESULT IN PERSONAL INJURY OR DEATH.  
D. COMBUSTION CHAMBER COIL CLEANING INSTRUCTIONS*  
*Before beginning this procedure, you must have on hand the following items:  
– a nylon, stainless or brass brush (not steel)  
(available at most hardware stores)  
1. Shut down the Munchkin by using the following steps:  
a. Close the gas valve, shut down the unit and wait for the unit to be cool to the touch  
b. Disconnect the condensate hose from the outside connection, (not from the Munchkin side),  
so the flow can be observed.  
c. Remove screws and loosen bracket holding gas valve in place.  
d. Pull connector to the venturi by sliding gas valve to left, remembering to disconnect both  
Molex connectors.  
e. Remove the (6) 10MM nuts from the burner plate assembly to access the coils.  
f. Pull the entire burner plate assembly towards you, while removing or pushing aside any  
wiring to allow the removal of the assembly.  
2. Using a spray bottle filled with the recommeded product “RYDLYME” or “CLR”, spray liberally on the  
coils, making sure the solution penetrates and funnels down through the condensate hose. If the con-  
densate hose is blocked, let the chemical penetrate for at least 15 minutes or until it drains.  
3. Use the nylon, stainless or brass brush (do not use steel) and scrub coils to remove any buildup, then  
vacuum the debris from the coils.  
4. Spray the coils with clear water, making sure to confine the spray to the area being cleaned (Try to avoid  
getting the back cermic wall of the unit wet). Flush the combustion chamber with fresh water. At this  
point, the Munchkin should be ready to power back up.  
Before powering up the Munchkin follow the steps below  
a. Re-install the burner assembly  
b. Replace the (6) 10MM nuts to the burner plate  
c. Re-connect the Molex connectors  
d. Re-connect gas valve, air-gas mixer and replace bracket. (IMPORTANT: CHECK FOR GAS  
LEAKS)  
e. Re-set thermostats (IMPORTANT: MAKE SURE EXHAUST VENT IS NO LONGER BLOCKED!)  
f. Turn the Munchkin back on** and observe condensate flow.  
g. Re-connect the condensate hose to the outside connection.  
DANGER  
IT IS EXTREMELY IMPORTANT THAT YOU CHECK FOR LEAKS WHEN  
RECONNECTING THE GAS VALVE AND MAKING SURE THE EXHAUST VENT IS NO  
LONGER BLOCKED. FAILURE TO DO SO MAY RESULT IN SEVERE PERSONAL INJURY  
OR DEATH.  
**NOTE: When firing up the boiler for the first few times you may experience some flut-  
tering of the gas burner that may result in a flame lockout. This is normal and will  
require you to re-cycle the unit until this clears up. This is caused by water still present  
in the combustion chamber.  
38  
MAINTENANCE  
E. MUNCHKIN CONTROLLERS  
STANDARD 925 CONTROL WIRING LAYOUT FOR 199VWH  
Fig. 8-1  
925 CONTROL WIRING LAYOUT FOR 399VWH  
Fig. 8-2  
39  
40  
41  
42  
NOTES  
43  
LP-147 REV. 7/7/04  

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