Munchkin HIGH EFFICIENCY HEATER with the "925" Controller - Manual (Page 3)

TABLE OF CONTENTS
3
TABLE OF CONTENTS
PART 1 . . . . . . . . . . . . . . . . . . . . . .4 thru 8
GENERAL INFORMATION
A How It Operates . . . . . . . . . . . . . . . . . .4
B Munchkin Ratings and Dimensions . . .4
C Pre-installation Requirements . . . . . . .8
D Pressure Relief Valve . . . . . . . . . . . . . .9
PART 2 . . . . . . . . . . . . . . . . . . . . .9 thru 11
ELECTRICAL
A Electrical Connection . . . . . . . . . . . . . .9
PART 3 . . . . . . . . . . . . . . . . . . . .12 thru 13
GAS CONNECTION
A Gas Connection . . . . . . . . . . . . . . . . . .12
B Gas Piping . . . . . . . . . . . . . . . . . . . . . .12
C Gas Table . . . . . . . . . . . . . . . . . . . . . . .12
PART 4 . . . . . . . . . . . . . . . . . . . .14 thru 21
VENTING
A Approved Venting Materials . . . . . . . .14
B Venting the Munchkin . . . . . . . . . . . . .15
C Longer Vent Runs . . . . . . . . . . . . . . . .17
D Heater Removal from a
Common Vent System . . . . . . . . . . . .18
E Condensate Removal . . . . . . . . . . . . .18
PART 5 . . . . . . . . . . . . . . . . . . . .22 thru 33
PIPING
A Hydronic piping with
Circulators or Zone Valves . . . . . . . . .22
B Circulator Sizing . . . . . . . . . . . . . . . . .23
C Fill and Purge Heating System . . . . . .24
D Piping Illustrations . . . . . . . . . . . . . . .25
PART 6 . . . . . . . . . . . . . . . . . . . .34 thru 37
START UP PROCEDURES
A Sequence of operation . . . . . . . . . . . .34
B Items to be checked before
lighting the Munchkin . . . . . . . . . . . . .34
C Lighting Instructions . . . . . . . . . . . . . .35
D Operating Instructions . . . . . . . . . . . .35
E Adjusting the Temperature
on the Munchkin Display . . . . . . . . . .36
F Status Menu . . . . . . . . . . . . . . . . . . . .36
G Test Mode . . . . . . . . . . . . . . . . . . . . . .37
H To Turn Off Gas to Appliance . . . . . . .37
PART 7 . . . . . . . . . . . . . . . . . . . .38 thru 40
TROUBLESHOOTING
A Munchkin Error Code . . . . . . . . . . . . .38
B Boiler Error . . . . . . . . . . . . . . . . . . . . .38
C Boiler Fault . . . . . . . . . . . . . . . . . . . . .38
PART 8 . . . . . . . . . . . . . . . . . . . .40 thru 44
MAINTENANCE
A Maintenance Procedures . . . . . . . . . .41
B Before Each Heating Season . . . . . . .41
C Condensate Cleaning Instructions . . .41
D Combustion Chamber
Coil Cleaning Instructions . . . . . . . . . .42
E Munchkin Controller . . . . . . . . . . . . . .43
F Components Diagrams . . . . . . . . .44–45