HEAT TRANSFER PRODUCTS, INC.120 BRALEY RD., E. FREETOWN, MA 02717Installing, Operating & MaintainingMUNCHKIN VWH HIGH EFFICIENCYHOT WATER SUP
10GAS CONNECTIONPART 3. GAS CONNECTIONA. GAS CONNECTIONThe gas supply shall have a maximum inlet pressure of less than 14” water column (350 mm), ½ p
11GAS CONNECTIONIt is recommended that a soapy solution be used to detect leaks. Bubbles will appear on the pipe toindicate a leak is present. The gas
12VENTINGPART 4. VENTINGA. APPROVED VENTING MATERIALSEXHAUST VENTUse Plastic 3” and 4” and 6” Pipe Schedule 40 or 80.1. Non-Foam Core PVC Pipe2. Non-F
13VENTINGThe inlet pipe on the back of the cabinet is 3" for the 199 VWH and 4" for the 399 VWH. It is veryimportant that you plan the locat
14VENTINGRECOMMENDED VENTING CLEARANCES PER THE NATIONAL FUEL GAS CODE*All venting must be properly supported. The Munchkin is not intended to support
15The connection of air inlet and exhaust vent at the heater must remain 3” for 199VWH and 4” for399VWH and each vent must extend from the heater a mi
16VENTING3. If practical, close all building doors, windows and all doors between the space in which theappliance remains connected to the common vent
17VENTINGFigure 4-1: Sidewall Vent with Tee (Intake) &Coupling (Exhaust) for standard floorunits3” piping for 199VWH4” piping for 399VWH**IMPORTAN
18VENTINGDIAGRAMS FOR VERTICAL VENTINGFigure 4-5: Roof Vent with tee (intake) & coupling(exhaust) for standard floor units3” piping for 199VWH4” p
19PIPINGPART 5. PIPING THE MUNCHKIN VWH TO THE STORAGE TANKThe Munchkin is designed to be connected to a storage tank to supply domestic hot water. H
USING THIS MANUAL2USING THIS MANUALSPECIAL ATTENTION BOXES Throughout this manual you will see thesespecial attention boxes similar to this one,which
20PIPINGPiping Symbol Legendcirculator (open loop) (w/ isolation flanges)gate valveglobe valveball valveswing-check valvespring-loaded check valvehose
21PIPINGVolume Water Heatingusing Munchkin boiler(1 boiler supplying one storage tank)Drawing VWH 1/1flow switchexpansiontankASEE 1017 rated anti-scal
22PIPINGVolume Water Heatingusing Munchkin boiler(1 boiler supplying two storage tanks)flow switchexpansiontankASEE 1017 rated anti-scald valve(recomm
23PIPINGDrawing VWH 2/1 HVolume Water Heatingusing Munchkin boiler(2 boilers supplying one storage tank)NOTES:1. This drawing is meant to show syste
24PIPINGVolume Water Heatingusing Munchkin boiler(2 boilers supplying one storage tank)Drawing VWH 2/1 VNOTES:1. This drawing is meant to show syste
25PIPINGDrawing VWH2/2 HVolume Water Heatingusing Munchkin boilers(2 boilers supplying two storage tanks)NOTES:1. This drawing is meant to show syst
26PIPINGDrawing VWH2/2 VVolume Water Heatingusing Munchkin boilers(2 boilers supplying two storage tanks)NOTES:1. This drawing is meant to show syste
27PIPINGDrawing VWH 3/2 HVolume Water Heatingusing Munchkin boiler(3 boilers supplying two storage tanks)NOTES:1. This drawing is meant to show syste
28PIPINGDrawing VWH 3/2 VVolume Water Heatingusing Munchkin boiler(3 boilers supplying two storage tanks)NOTES:1. This drawing is meant to show syste
29START-UP PROCEDURESPART 6. START-UP PROCEDURES A. SEQUENCE OF OPERATION1. When power is first applied to the control, the control display will read
TABLE OF CONTENTS3TABLE OF CONTENTS PART 1 . . . . . . . . . . . . . . . . . . . . . .4 thru 8GENERAL INFORMATIONA How It Operates . . . . . . . . .
30C. LIGHTING INSTRUCTIONSFOR YOUR OWN SAFETY READ BEFORE OPERATING1. This appliance does not have pilot. It is equipped with an ignition device which
31F. STATUS MENUInstallers are also able to check the current status of the Munchkin parameters by pressing S4/Resetkey for 3 seconds. Once activated
32START-UP PROCEDURESH. TO TURN OFF GAS TO APPLIANCE1. Set the thermostat to lowest setting.2. Turn off all electric power to the appliance if service
MUNCHKIN 199VWH GAS VALVE MUNCHKIN 399VWH GAS VALVE START-UP PROCEDURES33Fig. 6-3THROTTLE ADJUSTER(NOTE: IF FOR ANY REASON THE THROTTLE NEEDS TO BE AD
34TROUBLESHOOTINGCAUTION This appliance has wire function labels on allinternal wiring. Observe the position of each wirebefore removing it. Wiring e
35TROUBLESHOOTINGTable 7-2: 925 Control Board FAULT CodesedoCnoitpircseDydemeR00F.dedeecxEtimiLhgiH.1.2.3noitarepopmupnoitalucrickcehCehtgnisseccaybre
36TROUBLESHOOTINGBoiler Resistance (ohms)32 3255041 2534050 1987059 1570068 1249077 1000086 805995 6535104 5330113 4372122 3605131 2989140 2490149 208
37MAINTENANCEPART 8. MAINTENANCEA. MAINTENANCE PROCEDURESPeriodic maintenance should be performed once a year by a qualified service technician to ass
38MAINTENANCEin which case, a qualified plumber will need to be contacted to follow the Coil Cleaning Instructions(Section D) included in this section
39MAINTENANCESTANDARD 925 CONTROL WIRING LAYOUT FOR 199VWHFig. 8-1925 CONTROL WIRING LAYOUT FOR 399VWHFig. 8-2E. MUNCHKIN CONTROLLERS
GENERAL INFORMATION4RECOMMENDED SERVICE CLEARANCESPART 1. GENERAL INFORMATIONA. HOW IT OPERATESThe Munchkin VWH is a hot water supply boiler designed
NOTES43
LP-147 REV. 7/7/04
GENERAL INFORMATION5B. MUNCHKIN RATINGS AND DIMENSIONSMODEL INLET OUTLET RECOVERY RATEFIRST HOUR RATINGW/ 80 GAL. STORAGE TANKFIRST HOUR RATINGW/ 119
6GENERAL INFORMATIONDIMENSIONSFigure 1-2
GENERAL INFORMATION7GENERAL 1. Munchkin VWH is supplied completely assem-bled as a packaged boiler. The package shouldbe inspected for damage upon rec
8If the Munchkin is set up for liquefied petroleum (LP) gas, some geographic areas follow the UniformMechanical Code, section 304.6, “Liquefied petrol
9ELECTRICALPART 2. ELECTRICALA. ELECTRICAL CONNECTION The electrical connection for the Munchkin is on the left hand side of the unit. There is a ½” k
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