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TABLE OF CONTENTS
3
TABLE OF CONTENTS
PART 1 . . . . . . . . . . . . . . . . . . . . . .4 thru 6
GENERAL INFORMATION
A How It Operates . . . . . . . . . . . . . . . . . .4
B Munchkin Ratings and Dimensions .4–5
C Pre-installation Requirements . . . . . . .5
D Pressure Relief Valve . . . . . . . . . . . . . .6
PART 2 . . . . . . . . . . . . . . . . . . . . . .6 thru 8
ELECTRICAL
A Electrical Connection . . . . . . . . . . . . . .6
PART 3 . . . . . . . . . . . . . . . . . . . . .8 thru 10
GAS CONNECTION
A Gas Connection . . . . . . . . . . . . . . . . . . .9
B Gas Piping . . . . . . . . . . . . . . . . . . . . . . .9
C Gas Table . . . . . . . . . . . . . . . . . . . . . . . .9
PART 4 . . . . . . . . . . . . . . . . . . . .11 thru 17
VENTING
A Approved Venting Materials . . . . . . . .11
B Venting the Munchkin in
4” or 6” Plastic Pipe . . . . . . . . . . . . . .11
C Longer Vent Runs Using a
Combination of 4” to 6” Pipe . . . . . . .14
D Heater Removal from a
Common Vent System . . . . . . . . . . . .15
E Condensate Requirements . . . . . . . . .17
PART 5 . . . . . . . . . . . . . . . . . . . .17 thru 28
PIPING
A Hydronic piping with
Circulators or Zone Valves . . . . . . . . .17
B Circulator Sizing . . . . . . . . . . . . . . . . .18
C Fill and Purge Heating System . . . . . .19
D Piping Illustrations . . . . . . . . . . . . .20–28
PART 6 . . . . . . . . . . . . . . . . . . . .29 thru 32
START UP PROCEDURES
A Items to be checked before
lighting the Munchkin . . . . . . . . . . . . .29
B Lighting Instructions . . . . . . . . . . . . . .29
C Operating Instructions . . . . . . . . . . . .30
D Adjusting the Temperature
on the Munchkin Display . . . . . . . . . .30
E Status Menu . . . . . . . . . . . . . . . . . . . .31
F Test Mode . . . . . . . . . . . . . . . . . . . . . .31
G To Turn Off Gas to Appliance . . . . . . .31
PART 7 . . . . . . . . . . . . . . . . . . . .32 thru 36
SERVICING
A Sequence of operation . . . . . . . . . . . .32
B Munchkin Temporary
Fault Condition . . . . . . . . . . . . . . . . . .32
C Munchkin Fault Requiring
Manual Reset . . . . . . . . . . . . . . . . . . .34
PART 8 . . . . . . . . . . . . . . . . . . . .37 thru 41
MAINTENANCE
A Maintenance Procedures . . . . . . . . . .37
B Before Each Heating Season . . . . . . .37
C Condensate Cleaning Instructions . . .37
D Combustion Chamber
Coil Cleaning Instructions . . . . . . . . . .38
E Munchkin Controller . . . . . . . . . . . . . .39