UTICA BOILERS MAHF-75 User manual

Manufactured by:
ECR International Inc.
2201 Dwyer Avenue, Utica, NY 13501
Tel. [phone]
www.ecrinternational.com
MAHF-75
MAHF-100
MACF-115
MAHF-125
MACF-150
MAHF-165
MACF-205
CONDENSING
GAS FIRED BOILER

MACF-150

CONTENTS :
INSTALLATION, OPERATION,
AND MAINTENANCE MANUAL
(240013503)
APPLICATION GUIDE
(240012875)
COMMISSIONING
GUIDE
(240011376)
REQUIRED
INSPECTION SPECIAL
(240011561)
BACK COVER

MAHF-125

CONDENSING GAS FIRED
INSTALLATION, OPERATION
& MAINTENANCE MANUAL
Models:
COMBI
MACF- 115
MACF- 150
MACF- 205
H EATI N G ON LY
MAHF- 75
MAHF- 100
MAHF- 125
MAHF- 165
Manufactured by:
ECR International Inc.
2201 Dwyer Avenue, Utica, NY 13501
Tel. [phone]
www.ecrinternational.com
PN 240013503 REV. A [03/15/2022]

2
Fully Assem bled Boiler 3 0 PSI Sa fe t y Re lie f
Valve
Te m pe ra t ur e Pr e ssu re
Gauge ( 2 " Sh ank )
3 / 4 N PT Ba ll Ga s
Shuto Valve
I ncludes Essential
Docum ent s and Warrant y
11x17 Wire Diagram s
D H W Op t ion al Pipe
He at On ly Boile r
Copper Flu sh Bush ing
1 / 2 ” x 1 / 4 ” N PT
Copper Te e
1 - 1 / 4 ” x 1 - 1 / 4 “x 1 / 2 ” Docum ent Pa ck a ge
VERI FY CON TEN TS RECEI VED
Threaded End
Non-Threaded
End
Copper Tee
NOTICE
Using proper brazing or soldering technique,

wit h t hreading up and non-t hreaded end down.
I f t he threaded end is not UP the TP gauge
cannot engage the threads in t he bushing.
* Verify proper m odel size before use.
240013503 REV A, [ 03/ 15/ 2022]
For Pa rt s list s see m anua l 2 4 0 0 1 3 5 0 5 include d
w it h y ou r boile r lit e r a t ur e pa ck a ge .

3
V er if y Con t e nt s Re ce iv e d...............................................2
Ta ble Of Con t e nt s ..........................................................3
Physical Data.................................................................4
1 - I m port a nt I n form at ion .............................................7
2 - I n t ro du ct io n .............................................................8
2.3 Requirem ent s For Com m onwealt h Of Massachuset ts: 8
2.4 Use Of Carbon Monoxide Monit or ............................8
2.5 Designated Use ....................................................8
2.6 The Unit Must Not:................................................8
2.7 Operat ional Feat ures .............................................8
3 - Com p on ent List in g ...................................................9
4 - Lo ca t in g Boile r .......................................................15
4.1 Boiler Locat ion Considerat ions ............................ 15
4.2 Floor Locat ion....................................................15
4.3 Clearances ........................................................16
5 - Com b ust ion Air An d V en t Pip in g .............................17
5.1 General ............................................................. 17
5.2 Rem oval Of Exist ing Boiler From Com m on Vent
Syst em ...................................................................18
 .........................................................18
5.4 Approved Vent ing Mat erials .................................19
5.5 Vent Ter m inat ion ................................................ 19
5.6 Coaxial Vent ing I nst ruct ions.................................21
5.7 Coaxial Vent Scr ew Placem ent ............................. 22
5.8 Twin Pipe Syst em s ..............................................23
5.9 Twin Pipe Polypropylene Adapt er Kit I nst allation............
24
5.10 Twin Pipe CPVC Adapter Kit I nst allat ion ............... 24
5.11
Tw in PipePolypr opyleneAdapt er Kit I nst allat ion ...........25
5.12 Twin Pipe Cpvc Adapt er Kit I nst allat ion ......... 25
5.13 Securing Twin Pipe Polypropylene Vent ing ............26
5.14 Flexible Vent Syst em ........................................29
5.15 Condensat e Piping ............................................31
6 - Hydron ic Piping ......................................................32
6.1 General ............................................................. 32
6.2 Special Condit ions ..............................................32
6.3 Safety Relief Valve And Air Vent ........................... 33
6.4 Trim Piping.........................................................33
6.5 System Piping ....................................................33
 .................... 35
6.7 Manufact urer Recom m endat ion - St rainer .............. 36
6.8 Central Heat ing Syst em ....................................... 37
6.9 Frost Prot ect ion Mode.......................................... 37
6.11 Pum p Prot ect ion ...............................................37
7 - Gas Su pply Piping ..................................................38
7.1 General ............................................................. 38
7.2 Gas Pipe Recom m endat ions ................................. 39
7.3 Leak Check Gas Piping ........................................ 41
........................................................ 41
8 - Ele ct r ica l Con ne ct ion s ............................................42
8.1 General ............................................................. 42
8.2 Electrical Connect ions .........................................42
8.3 Access To Connect ion Block.................................. 43
8.4 Main Supply Connection ...................................... 43
8.5 I nst all Room Therm ostat .....................................44
8.6 Outdoor Air Sensor ( OAS) Elect rical Connect ions.... 44
8.7 I ndirect St orage Tank .......................................... 46
8. 9 Managem ent Of 0- 10v I n put ................................46
9 - St a r t Up Pr oce dur e ................................................. 4 8
9.1 Central Heat ing Syst em Connect ions - Heat Only ... 48
9.2 Cent ral Heat ing Sy stem Connect ions - Com bi......... 48
9.3 System St art Up .................................................49
9.4 Fill Condensate Trap Wit h Wat er ...........................49
9.5 Control Panel......................................................50
9.6 Prior To Com m issioning ....................................... 51
9.7 Com m issioning For The First Tim e ........................51
9.8 Autom at ic Calibrat ion Funct ion .............................51
9.9 Manual Calibration Funct ion: ................................52
9.10 De-Aerat ion Funct ion .........................................52
9.11 Changing The Type Of Gas .................................52
9.12 Chim ney Sweep Funct ion .................................. 53
9.13 Com bust ion Adj ust m ent Funct ion ( CO2% ) ........... 53
9.14 Check Firing Rat e.............................................. 54
9.15 Param et er Set tings ........................................... 54
9.16 Descript ion Of Param et ers: Fact ory Set tings......... 55
9. 17 Adj ust ing Maxim um Heat ing Power .....................57
1 0 - Ope ra t in g I n st r u ct io ns ......................................... 5 8
10.1 Test ing For Gas Leaks And Purging Gas Supply ..... 58
10.2 Boiler Operat ion................................................ 58
10.3 Central Heat ing Mode ........................................ 58
10.4 Dom est ic Hot Wat er Mode..................................59
10.5 Frost Prot ect ion ................................................ 59
10.6 Pum p ..............................................................59
10 .7 Low Wat er Pressure Sensor ( I nt ernal) ................. 59
1 1 - Ge ne r a l M a in t en a nce An d Cle a n in g ...................... 6 0
11.1 Beginning Of Each Heat ing Season...................... 60
11.2 Maintenance And Rout ine Servicing ..................... 61
11.3 Com ponent Replacem ent And Cleaning ............... 61
11.4 Draining The Boiler ...........................................62
11.5 Draining The Heat ing Circuit ...............................62
11.6 Hydraulic Unit ( DHW)........................................ 63
11.7 Cleaning The Cold Wat er Filt er ............................ 63
11.8 Final Com m issioning .........................................63
11.9 Final Assem bly .................................................63
11.10 User I nform at ion.............................................64
11.11 Safet y Flue Therm ost at . ...................................64
11.12 Flue Pressure Swit ch. ...................................... 64
11.13 Replacem ent Part s ..........................................64
1 2 - Ra t in gs An d Ca pa cit ie s ......................................... 6 5
12.1 Ratings And Capacity......................................... 65
 ...................... 65
12 .3 High Alt it ude Rat ings .........................................66
12.4 High Altitude Chart............................................ 66
12.5 Available Boiler Pum p Head ................................ 67
1 3 - Tr ou ble Sh oot in g ..................................................68
13.1 Error Messages And Reset t ing The Boiler ............. 68
13.2 Anom alies Table For The I nst aller - Use This Table To
Report The Anom aly Values. ......................................70
1 4 - Glossar y ............................................................... 7 1
Appendix A - W irin g D iagram s............................... 7 3 - 7 8
TABLE OF CON TEN TS
240013503 REV A, [ 03/ 15/ 2022]

4
DI M EN SI ON S
SYSTEM
When boiler is operat ing at m axim um operating t em perat ure, providing heating wit h all heat em it t ers operat ing, pressure

PH YSI CAL DATA
D I M EN SI ON S 7 5 / 1 0 0 / 1 2 5 1 1 5 / 1 5 0 1 6 5 / 2 0 5
AHeight (Bot tom of boiler t op of safet y Valve)
43. 65" [ 1.09 m ]
BOverall Widt h wit h Manifold
24. 70" [ 628 m m ]
CDept h
17. 46” [ 444 m m ] 23. 55” [ 598 m m ]
DCondensat e Trap Connection
3/ 4" [ 19.1 m m ] NPT
ESyst em Supply

Sweat Connect ion

Sweat Connect ion
FDHW Outlet ( 100 & 125 opt ional) 3/ 4” [ 19.1 m m ]
Copper Sweat
1/ 2” [ 15.9 m m ]
Copper Sweat
16 5- NA
205 - 3/ 4” [ 19.1 m m ]
GGas Connect ion
3/ 4” NPT [ 19.1 m m ]
HDHW ( Cold Wat er ) I nlet N/ A 1/ 2” [ 12.7 m m ]
Copper Sweat
165 - N/ A
205 - 3/ 4” [ 19.1 m m ]
IBoiler Ret urn
3/ 4” [ 19.1 m m ] 1” [ 38.1 m m ]
Boiler Filling Connect ion Ext ernal t o Boiler
Prim ary Wat er Cont ent 0.95 gal [ 3.60 L] 1 gal [ 3.80 L] 
Cen t ra l Heat in g ( Se aled Syst em ) 7 5 / 1 0 0 / 1 1 5 / 1 2 5 / 1 5 0 / 1 6 5 / 2 0 5
Heat Exchanger Max Allowable Working Pressure 50 psi [ 3.45 bar]
Max System Pr essure 43 psi [ 2.96 bar]
Min Syst em Pressure 7.25 psi [ 0.50 bar]
Max Sy st em tem perat ure 176° F [ 80° C]
Pressure Relief Valve Set ting 30 psi [ 2.11 bar]
Expansion Tank Min im um Size ( pr e- char ge pr ess.)
(75/100/115)
1.5 gal at 11.6 psi
[ 7.0 L at 0.8 bar]
( 125/ 150/ 165/ 205)
2.2 gal at 11.6 psi [ 10.0 L at 0.8 bar]
Recom m ended Syst em Pr essure ( cold) 12 psi [ 0. 83 bar]
Dom est ic Hot W a ter 1 1 5 1 5 0 2 0 5
Max I nlet Water Pr essure 116 psi [ 8 bar ]
Min I nlet Wat er Pr essure 2.9 psi [ 0.2 bar ]
Min DHW Flow Rat e t o Act ivat e 0.65 gpm [ 2.10 L/ m in]
Max DHW Tem perat ure 140° F [ 60° C]
DHW Flat Plat e Wat er Cont ent 0.035 gal [ 0.13 L] 0.053 gal [ 0.23 L] 0.10 gal [ 0.37 L]
240013503 REV A, [ 03/ 15/ 2022]

M OD ELS - 7 5 / 1 0 0 / 1 1 5 / 1 2 5 / 1 5 0
Top View
Front Vie w Right Side View
Left Side Vie w
10.44 in.10.44 in.
[266 mm][266 mm]
6.87 in.6.87 in.
[175 mm][175 mm]
18.56 in. [472 mm]18.56 in. [472 mm]
20.50 in. [521 mm]20.50 in. [521 mm]
24.70 in. [628 mm]24.70 in. [628 mm]
2.22 in.2.22 in.
[56.4 mm][56.4 mm]
9.13 in.9.13 in.
[232 mm][232 mm] 7.92 in.7.92 in.
[201 mm][201 mm]
6.63 in.6.63 in.
[168 mm][168 mm]
4.35 in.4.35 in.
[111 mm][111 mm]
6.12 in.6.12 in.
[156 mm][156 mm]
7.31 in.7.31 in.
[186 mm][186 mm]
1.80 in.1.80 in.
[46 mm][46 mm]
43.65 in.43.65 in.
[1.1 m][1.1 m]
40.23 in.40.23 in.
[1.0 m][1.0 m]
37.20 in.37.20 in.
[.95 m][.95 m]
2.99 in.2.99 in.
[76 mm][76 mm]
3.15 in.3.15 in.
[80 mm][80 mm]
10 in.10 in.
[255 mm][255 mm]
6.56 in.6.56 in.
[167 mm][167 mm]
4.35 in.4.35 in.
[110 mm][110 mm]
6.63 in.6.63 in.
[168 mm][168 mm]
9.13 in.9.13 in.
[232 mm][232 mm]
6.47 in.6.47 in.
[165 mm][165 mm]
42.03 in.42.03 in.
[1.0 m][1.0 m]
17.46 in.17.46 in.
[443 mm][443 mm]
2.90 in.2.90 in.
[74 mm][74 mm]
1.62 in.62 in.
[42 mm]
5
PH YSI CAL DATA
240013503 REV A, [ 03/ 15/ 2022]

Front View
1 6 5 & 2 0 5
Mode ls
M OD ELS - 1 6 5 & 2 0 5
Right Side
View
1 6 5 & 2 0 5
Le ft Side Vie w
1 6 5 & 2 0 5
Mode ls
5.35 in.5.35 in.
[136 mm][136 mm] 13.33 in.13.33 in.
[339 mm][339 mm]
5.35 in.5.35 in.
[136 mm][136 mm]
8.388.38
[213 mm][213 mm]
42.69 in.42.69 in.
[1.08 m][1.08 m]
40.23 in.40.23 in.
[1.0 m][1.0 m]
37.20 in.37.20 in.
[.95 m][.95 m]
4.17 in.4.17 in.
[106 mm][106 mm]
2.46 in.2.46 in.
[62 mm][62 mm]
2.90 in.2.90 in.
[74 mm][74 mm]
3.32 in.3.32 in.
[84 mm][84 mm]
9.39 in.9.39 in.
[239 mm][239 mm]
6.26 in.6.26 in.
[159 mm][159 mm]
3.07 in.3.07 in.
[78 mm][78 mm]
41.87 in.41.87 in.
[1.06 m][1.06 m]
7.39 in.7.39 in.
[187 mm][187 mm]
6.26 in.6.26 in.
[159 mm][159 mm]
10 in.10 in.
[255 mm][255 mm]
23.55 in.23.55 in.
[598 mm][598 mm]
9.079.07
[230 mm][230 mm]
1.67 in.1.67 in.
[43 mm][43 mm]
8.46 in.8.46 in.
[215 mm][215 mm]
12.02 in.12.02 in.
[205 mm][205 mm]
Top Vie w
1 6 5 & 2 0 5
18.56 in. [472 mm]18.56 in. [472 mm]
20.43 in. [519 mm]20.43 in. [519 mm]
24.75 in. [624 mm]24.75 in. [624 mm]
25.80 in. [655 mm]25.80 in. [655 mm]
7.18 in.7.18 in.
[182 mm][182 mm]
16.71 in.16.71 in.
[424 mm][424 mm]
6
PH YSI CAL DATA
240013503 REV A, [ 03/ 15/ 2022]

7
1 - I M PORTAN T I NFORM ATI ON
CAUTI ON
I ndicat es a hazardous situat ion which, if not
avoided, could result in m inor or m oderat e inj ury.
!!
W ARN I N G
I ndicat es a hazardous situat ion which, if not
avoided, could result in deat h or serious inj ury.
!
D AN GER
I ndicat es a hazardous situat ion which, if not
avoided, WI LL result in deat h or serious inj ury.
!
This is t he safety aler t sym bol. Sym bol alerts you t o
pot ent ial per sonal inj ur y hazar ds. Obey all safet y m essages
follow ing t his sy m bol t o av oid possible inj ur y or deat h.
Becom e fam iliar wit h sym bols identifying pot ent ial hazards.

agency. See glossar y for addit ional infor m at ion.
1 . Sa fe t y I nfor m a t ion
W ARN I N G
Do not t am per with or use t his boiler for any
purpose ot her t han it s intended use. Failure
to follow t hese instruct ions could result in
deat h or ser ious inj ury. Use only m anu fact ur er
recom m ended part s and accessories.
!
CAUTI ON
Laceration, burn hazard. Met al edges and part s
m ay have sharp edges and/ or m ay be hot . Use
appropr iat e personal prot ect ion equipm ent t o
include safety glasses and gloves when installing
or servicing this boiler. Failure t o follow t hese
inst ruct ions could result in m inor or m oderat e
in j ury.
!!
NOTICE
Used to address pract ices not related to personal
in j ury.
W ARN I N G
Fire, explosion, asphyxiat ion and electrical shock
hazard. I m proper inst allat ion could result in
deat h or ser ious inj ury. Read t his m anual and
understand all requirem ents before beginning
inst allat ion.
!
FOR YOUR SAFETY READ BEFORE OPERATING
H ot W a t e r Ca n Sca ld!
Wat er heated to t em perature for clot hes washing,
dish washing and ot her sanit izing needs can scald
and cause perm anent inj ury.

handicapped persons are m ore likely t o be
perm anent ly inj ured by hot wat er. Never leave
them unat t ended in bat ht ub or shower. Never allow
sm all children to use a hot wat er tap or draw t heir
own bat h.

above descript ion, or if st ate laws or local codes
require cert ain wat er t em perat ures at hot wat er
taps, you m ust t ake special precaut ions:
• Use lowest possible t em perature sett ing.
• I nst all som e t ype of t em pering device, such
as an autom at ic m ixing valve, at hot wat er
tap or wat er heat er. Aut om at ic m ixing valve
m ust be select ed and installed according
to m anufacturer's recom m endat ions and
inst ruct ions.
• Wat er passing out of drain valves m ay be
ex tr em ely hot . To av oid inj ur y:
• Make sure all connect ions are t ight .
• 
DAN GER
!
Water
Temperature
Seng
1st Degree Burn
Exposure Time For
An Adult
2nd and 3rd Degree Burn
Exposure Time For An
Adult
120° F 1 minute 5 minutes
130° F 5 seconds 30 seconds
140° F 2 seconds 5 seconds
150° F 1 second 1.5 seconds
160° F Instantaneous 0.5 seconds
N ot e : Warning for I nfants, Children, and Elderly:
Great care m ust be taken when exposing t he
aforem entioned groups to warm or hot wat er as they
can be badly burned in exposure t im es less t han half
of t he t im e for an adult .
W ARN I N G
Fire, Explosion, Asphyxiat ion, Elect rical shock
hazard! Flooding will result in dam ages such as
elect rical problem s, corrosion, inoperat ive part s,
m old and ot her unforeseen issues which can
occur over t im e. Any equipm ent det erm ined by

excess of wat er or ot her liquid, shall be replaced.
Failure to follow t hese directions will result in a
Hazardous Sit uation.
!
240013503 REV A, [ 03/ 15/ 2022]

8
2 - I N TROD UCTI ON
Check our website frequently for updates: www.ecrinternational.com
Information and specications outlined in this manual in eect at the
t im e of pr in t in g o f t h is m a n ua l. ECR I n t er n at io na l r e se r ve s t h e r ig h t t o
discontinue, change specications or system design at any time without
n ot ice a n d w it h ou t in cu r rin g a n y ob lig a t ion , w h a t soe ve r .
2 .5 D e sign at e d U se
• M ACF- 1 1 5 , MACF- 1 5 0 and M ACF- 2 0 5 provide
bot h central heat ing and dom est ic hot wat er.
• M AHF- 7 5 M AHF- 1 0 0 , MAH F- 1 2 5 and
MAH F- 1 6 5 cent ral heat ing only.
• I ndoor inst allat ion.
• Closet or alcove inst allat ion. Direct Vent Boiler
does not require air vent s when inst alled in closet
or room .
• Direct vent boiler.
• 
gases ( LP/ pr opane) .
2 - I n t rodu ct ion
2 .1 I nst allat ion shall conform t o requirem ent s of
authorit y having jurisdict ion or in absence of such
requirem ent s:
UN I TED STATES
• Nat ional Fuel Gas Code, ANSI Z223.1/ NFPA 54.
• Nat ional Electrical Code, NFPA 70.
CAN AD A
• Nat ural Gas and Propane I nst allat ion Code, CAN/
CSA B149.1.
• Canadian Elect rical Code, Part I , Safety Standard
for Elect rical I nst allations, CSA C22.1
2 . 2 Where required by aut hority having jurisdict ion,
inst allat ion shall conform to St andard for Cont rols and
Safet y Devices for Autom at ically Fired Boilers, ANSI /

does not qualify for CSD1

required.
2 .3 Requirem e nt s for Com m onw ea lt h of
M a ssa ch u se t t s:
Boiler inst allat ion m ust conform t o Com m onwealt h of
Massachuset t s code 248 CMR which includes but is not
lim it ed t o:

2 .6 Th e u nit M UST N OT:
• Direct ly heat pot able wat er. I ndirect heat ing is
accept able.
• Heat w at er w it h non- hydronic heat ing sy st em
chem icals present ( exam ple, swim m ing pool
wat er ) .
• Toxic chem icals, such as t hose used for boiler
t reat m ent , shall not be int roduced into pot able
water.
• Exceed 43 psig ( 2.96 bar) m ax im um syst em
pressure, or dr op below m inim um syst em
pr essur e 7.25 psig ( .50 bar )
• Exceed 176° F ( 80° C) sy st em design t em perat u re.
2 .7 Ope ra t ion al Fe a t ur es
• M AHF - 7 5 Modulat es input t o provide CH
Turndow n 4.5: 1.
• M AH F - 1 0 0 Modulat es input to provide CH
Turndown 5.6: 1
• M ACF- 1 1 5 Modulates input to provide CH
Turndown 5.6: 1, DHW Turndown 6.9: 1
• M AH F- 1 2 5 Modulat es input t o provide CH
Turndown 5.7: 1
• M ACF- 1 5 0 Modulates input to provide CH
Turndown 5.7: 1, DHW Turndown 7: 1
• M AH F- 1 6 5 Modulat es input to provide CH
Turndown 5.5: 1
• M ACF- 2 0 5 Modulates input to provide CH
Turndown 5.5: 1, DHW turndown 7: 1
• Maxim um output available for dom est ic hot
water:
MACF- 1 1 5 - 105,500 bt u/ hr ( 33.8 kW) capable of
providing 2.5 ( U.S.) gpm ( 11.4 lit ers/ m in) wit h a
t em perat ure rise of 70° F/ 39° C.
MACF- 1 5 0 - 136, 000 bt u/ h ( 4 0 kW) , capable of
providing 3.5 ( U.S.) gpm ( 13.2 lit ers/ m in) wit h a
t em perat ure rise of 70° F/ 39° C.
MACF- 2 0 5 - 180,000 bt u/ h ( 53 kW) , capable of
providing 5.0 ( U.S.) gpm ( 18.9 lit ers/ m in) wit h
t em perat ure rise of 70° F/ 39° C.
• 
• Opt ional Out door Tem perat ure Reset .
• Heat exchanger over heat prot ection.
• Boiler operat ing at m axim um operat ing
t em perat ur e, prov iding heat , pr essure gauge
should not indicat e m ore t han 26.11 psi /

expansion t ank is required.
2 .4 Ma nu fact u re r recom m ends use of Car bon
Monoxide m onitor m ay be require m en t of local
j u risdict ion .
240013503 REV A, [ 03/ 15/ 2022]

9
3 - COM PON EN T LI STI N G
I TEM
NO.
Ut ica Boile r
MAH F 7 5 & 1 0 0
1Coaxial Connector
2Flue Sensor
3Heat Exchanger
4Bu rner ( not show n)
5Flam e Det ect ion Elect rode
6Air/ Gas Blend Manifold
7Fan
8Venturi
9Pum p wit h Air Separat or
1 0 Boiler Drain Tap
1 1 Heat ing Ret urn
1 2 Gas I nlet
1 3 Opt ional I ndirect Tank
Connect ion
1 4 Heat ing Supply Connect ion
1 5 Condensat e Connection
1 6 
1 7 3-Way Valve wit h Mot or
1 8 Gas Valve
1 9
Over Tem perat ure Therm ost at
2 0 NTC Heating Sensor
2 1 I gnit ion Electrode
2 2 Pressure Relief Valve
2 3 Exhaust Test Port
2 4 I nt ake Test Por t
9
2
4
1
3
6
5
7
8
1 0
1 3
2 3
2 4
2 0
1 9
2 1
1 11 21 4
1 5
1 6
1 7
1 8
2 2
240013503 REV A, [ 03/ 15/ 2022]
UTI CA BOI LER MAH F 7 5 & 1 0 0

1 0
3 - COM PON EN T LI STI N G
I llust rat ion s ar e a depict ion of th e boiler for gen eral locat ion of p ar ts an d m ay v ar y depend ing on m odel.
I TEM
NO.
Ut ica Boile r
MAH F- 1 2 5
1Coaxial Connector
2Flue Sensor
3Heat Exchanger
4Bu rner ( not show n)
5Flam e Det ect ion Elect rode
6Air/ Gas Blend Manifold
7Venturi
8Fan
9Pum p wit h Air Separat or
1 0 Boiler Drain Tap
1 1 Heat ing Ret urn
1 2 Gas I nlet
1 3 Opt ional I ndirect Tank
Connect ion
1 4 Heat ing Supply Connect ion
1 5 Condensat e Connection
1 6 
1 7 3-Way Valve wit h Mot or
1 8 Gas Valve
1 9 Wat er Safet y Therm ost at
2 0
NTC Heat ing sen sor ( Ret ur n) QTY
2, ( 1 Show n for clar it y)
2 1 I gnit ion Electrode
2 2 Pressure Swit ch
2 3 Pressure Relief Valve
2 4 Exhaust Test Port
2 5 I nt ake Test Por t
9
2
4
1
3
6
5
7
8
1 0
1 3
2 2
2 4
2 5
2 0
1 9
2 1
1 11 21 4
1 5
1 6
1 7
1 8
2 3
240013503 REV A, [ 03/ 15/ 2022]
UTI CA BOI LER MAH F- 1 2 5

1 1
I TEM
NO.
Ut ica Boile r
MAH F- 1 6 5
1Coaxial Connector
2Flue Sensor
3Heat Exchanger
4Bu rner ( not show n)
5Flam e Det ect ion Elect rode
6Air/ Gas Blend Manifold
7Fan
8Venturi
9Pum p wit h Air Separat or
1 0 Boiler Drain Tap
1 1 Heat ing Ret urn
1 2 Heat ing Supply Connect ion
1 3 Gas I nlet
1 4 Condensat e Connection
1 5 
1 6 I nlet Elem ent
1 7 Gas Valve
1 9
Over Tem perat ure Therm ost at
2 0 NTC Heating Sensor
2 1 I gnit ion Electrode
2 2 Pressure Relief Valve
2 3 Exhaust Test Port
2 4 I nt ake Test Por t
3 - COM PON EN T LI STI N G
I llust rat ion s ar e a depict ion of th e boiler for gen eral locat ion of p ar ts an d m ay v ar y depend ing on m odel.
9
2
4
1
3
6
5
7
8
1 0
1 2
2 0
1 9
2 1
1 11 3
1 4
1 6
1 7
2 2
2 3
2 4
240013503 REV A, [ 03/ 15/ 2022]
UTI CA BOI LER MAH F- 1 6 5

1 2
I TEM
NO.
Ut ica Boile r
MACF- 1 1 5
1Coaxial Connector
2Flue Sensor
3Heat Exchanger
4Bu rner ( not show n)
5Flam e Det ect ion Elect rode
6Air/ Gas Blend Manifold
7Venturi
8Fan
9Pum p wit h Air Separat or
1 0 DHW Priority Sensor
1 1 Flow Sensor wit h Water Filt er
and Flow Rest rict or
1 2 Boiler Drain Tap
1 3 Heat ing Ret urn
1 4 Cold Water DHW I nlet
1 5 Gas I nlet
1 6 DHW Outlet
1 7 Heat ing Supply
1 8 Condensat e Connection
1 9 DHW Heat Exchanger
2 0 NTC DHW Sensor
2 1 
2 2 3-Way Valve wit h Mot or
2 3 Gas Valve
2 4 Wat er Safet y Therm ost at
2 5
NTC Heat ing sen sor ( Ret ur n) QTY
2, ( 1 Show n for clar it y)
2 6 I gnit ion Electrode
2 7 Pressure Relief Valve
2 8 Exhaust Test Port
2 9 I nt ake Test Por t
9
1 6
2
2 5
2 4
1 9
4
1
2 6
3
6
5
7
8
2 7
1 0
1 1
1 2
1 4 1 31 51 7
1 8
2 0
2 1
2 2
2 3
2 8
2 9
3 - COM PON EN T LI STI N G
I llust rat ion s ar e a depict ion of th e boiler for gen eral locat ion of p ar ts an d m ay v ar y depend ing on m odel.
240013503 REV A, [ 03/ 15/ 2022]
UTI CA BOI LER M ACF- 1 1 5

1 3
3 - COM PON EN T LI STI N G
I llust rat ion s ar e a depict ion of th e boiler for gen eral locat ion of p ar ts an d m ay v ar y depend ing on m odel.
9
1 6
2 7
2
2 5
2 4
1 9
4
1
2 6
3
6
5
7
8
2 8
1 0
1 1
1 2
1 4 1 31 51 7
1 8
2 0
2 1
2 2
2 3
2 9
3 0
I TEM
NO.
Ut ica Boile r
MACF- 1 5 0
1Coaxial Connector
2Flue Sensor
3Heat Exchanger
4Bu rner ( not show n)
5Flam e Det ect ion Elect rode
6Air/ Gas Blend Manifold
7Venturi
8Fan
9Pum p wit h Air Separat or
1 0 DHW Priority Sensor
1 1 Flow Sensor wit h Water Filt er
and Flow Rest rict or
1 2 Boiler Drain Tap
1 3 Heat ing Ret urn
1 4 Cold Water DHW I nlet
1 5 Gas I nlet
1 6 DHW Outlet
1 7 Heat ing Supply
1 8 Condensat e Connection
1 9 DHW Heat Exchanger
2 0 NTC DHW Sensor
2 1 
2 2 3-Way Valve wit h Mot or
2 3 Gas Valve
2 4 Wat er Safet y Therm ost at
2 5
NTC Heat ing sen sor ( Ret ur n) QTY
2, ( 1 Show n for clar it y)
2 6 I gnit ion Electrode
2 7 Pressure Swit ch
2 8 Pressure Relief Valve
2 9 Exhaust Test Port
3 0 I nt ake Test Por t
240013503 REV A, [ 03/ 15/ 2022]
UTI CA BOI LER M ACF- 1 5 0

1 4
I TEM
NO.
Ut ica Boile r
MACF- 2 0 5
1Coaxial Connector
2Flue Sensor
3Heat Exchanger
4Bu rner ( not show n)
5Flam e Det ect ion Elect rode
6Air/ Gas Blend Manifold
7Fan
8Venturi
9Pum p wit h Air Separat or
1 0 DHW Priority Sensor
1 1 Flow Sensor wit h Water Filt er
and Flow Rest rict or
1 2 Heat ing Ret urn
1 3 Cold Water DHW I nlet Tap
1 4 Gas I nlet
1 5 DHW Outlet
1 6 Heat ing Supply Connect ion
1 7 Condensat e Connection
1 8 DHW Heat Exchanger
1 9 NTC DHW Sensor
2 0 
2 1 3-Way Valve wit h Mot or
2 2 Gas Valve
2 3
NTC Heat ing sen sor ( Flow / Ret ur n)
QTY 2, ( 1 Show n for clarit y )
2 4 Wat er Safet y Therm ost at
2 5 I gnit ion Electrode
2 6 Pressure Relief Valve
2 7 Exhaust Test Port
2 8 I nt ake Test Por t
3 - COM PON EN T LI STI N G
I llust rat ion s ar e a depict ion of th e boiler for gen eral locat ion of p ar ts an d m ay v ar y depend ing on m odel.
9
1 5
2
2 4
2 3
1 8
4
1
2 5
3
6
5
7
8
2 6
1 0
1 1
1 3 1 21 4
1 6
1 7
1 9
2 0
2 1
2 2
2 7
2 8
240013503 REV A, [ 03/ 15/ 2022]
UTI CA BOI LER M ACF- 2 0 5

1 5
4 .1 Boile r Loca t io n Con side ra t ion s
• Am bient room t em perat ure alw ay s m aintain
abov e 32 ° F ( 0° C) t o pr ev ent freezin g of liquid
condensate.
• Approved for inst allat ion in closet s or alcove
provided it is correct ly designed for t hat purpose
and m inim um clearances are m et .
• Prot ect gas ignit ion syst em com ponent s from
wat er ( dripping, spraying, rain, etc.) during
operat ion and ser vice ( cir cu lat or r eplacem ent ,
condensat e t r ap, con t rol replacem ent , et c.) .
• Access t o out doors t o m eet m inim um and
m axim um pipe lengt hs for com bust ion air and
vent piping. See sect ion 5.
• Disposal of condensat e. See sect ion 5.
• Drainage of wat er ( or water - antifreeze solution)
during boiler service or from safet y relief valve
discharge. See sect ion 6.
• Access to syst em wat er piping, gas supply, and
electrical service. See sect ions 6, 7 and 8.
• Clearances t o com bust ible m at erials and service
clearances. See Table 1 and Figures pg. 16.
• Room - sealed boiler inst alled in room containing
bat h or shower shall be inst alled so person using
bat h or shower cannot touch any electrical switch
or boiler control ut ilizing line volt age electricit y.
• Mult iple Boilers can be placed side by side, or
back t o back.
• Observe service clearances in all inst allat ions.
• For Direct Vent inst allat ions, air vents are not
required in room boiler is inst alled in, or when
inst alled in closet or com part m ent .
• Requires fresh air intake piped from out doors.
• 

CFM can be
placed on air int ake section of vent pipe.
• Use of unregulat ed gas ( w ell gas) is not
m anufact ur er recom m ended wit h t his boiler.
4 - LOCATI N G BOI LER
4 .2 Flo or Loca t ion
• Place crat ed boiler as close t o select ed locat ion as
possible and uncrat e boiler. Boiler m ay be m oved
into position w it h appliance dolly or ( 2) two wheel
hand truck. I nsert dolly or hand truck under left
hand side of boiler. I t is possible t o slide boiler for

• Adj ust t he posit ion of t he boiler , ver ify it is lev el
and plum b.
• Select level locat ion cent ral t o piping syst em s
served and as close t o vent and air intake
term inals as possible.
• Accessibilit y clear an ces, if m or e st ringent ( i. e.

clearances, shall be used for boiler inst allation.
Accessibilit y clearances m ay be achieved w ith t he
use of r em ovable walls or par tit ions.
• Boiler is approved for inst allat ion in closet s and
This boiler shall NOT be
installed on carpeting.
• I nst all equipm ent in locat ion which facilit at es
operat ion of venting and com bust ion air int ake
piping syst em s as described in t his m anual.
• Advise owner t o keep venting and com bust ion
air int ake passages free of obst ruct ions. Bot h
vent ing and com bust ion air int ake piping syst em s

piping syst em s wit hout rest rictions for boiler
operat ion.
• Keep boiler area clean of debris and free of

liquids.
W ARN I N G
Fire hazard. Do not inst all boiler on com bust ible

inst ruct ions could result in deat h or serious
in j ury.
!
W ARN I N G
Fire, explosion, and asphyxiat ion hazard.
I m proper installat ion could result in deat h or
ser ious inj ury. Read t hese inst ruct ions and
understand all requirem ents before beginning
inst allat ion.
!
240013503 REV A, [ 03/ 15/ 2022]

1 6
NOTE: Greater clearances for access should supersede

Minimum ClearanceMinimum Clearance
17 ¾ in. [450 mm ]17 ¾ in. [450 mm ]
From Front of BoilerFrom Front of Boiler
13.58 in /
345.00 mm
1212 inin
[305 mm][305 mm]
17  in
[450 mm]
8 ⅝in [220 mm]
40  in
[1.02 m]
75 ,100, 115,
125, & 150
13   in
[345 mm]
4 .3 Clea rance s
11    inin
[45 mm][45 mm]
Left Side View of Boiler Front View of Boiler
Se r vice Clea ra nce s
4 - LOCATI N G BOI LER
1  in
[45 mm]
17in
Top ViewTop View
BackBack
Closet Installation
0 in / 0 m m bet ween Back of Unit and wall0 in / 0 m m bet ween Back of Unit and wall
1  in
[45 mm]
1in
[45 mm]
1in
[45 mm]
[450 mm]
Front View of Boiler
0in
[0 mm]
0in
[0 mm]
Top View
0in
[0 mm]
0in
[0 mm]
Com bust ible Cle ar a nce s
TABLE 1 : BOI LER CLEARAN CES
Dim e nsion Com bu st ib le
M a t er ia ls (1)
M a nufa ct u r er
Recom m ended for
Se rvice(1)(2)
To p
0" ( 0 cm ) 8 - 5/ 8" ( 22 0 m m )
Left Side
1- 3 / 4 " ( 45 m m ) 12 " ( 3 05 m m )
Right Side
1- 3 / 4 " ( 45 m m ) 1- 3 / 4 " ( 45 m m )
Front
0" ( 0 m m ) 17 - 3/ 4" ( 450 m m )
Back 0 " ( 0 m m ) 0" ( 0 m m )
Bot tom 0" ( 0 m m ) 0 "( 0 m m )
Com bust ion Air/ Vent piping
0" ( 0 m m ) 6" ( 16 0 m m )
(1) Requir ed dist ances m easur ed fr om b oiler j ack et .
(2) Ser vice, pr oper operat ion clearance recom m endat ion.
* Allowance for piping and vent ing not included.
165 & 205
23 ½in
[597 mm]
240013503 REV A, [ 03/ 15/ 2022]