Page 23
SECTION 7
ELECTRICAL AND WIRING DIAGRAMS
Table 7. Boiler Electrical Data
Water Flow Requirements
Electrical
Data
All Sizes
with
Low Loss Header
without
Low Loss Header
Voltage
120 V
120 V
FLA
0.70 A
0.20 A
MCA
0.90 A
0.25 A
MOP
15 A
15 A
Minimum Clearances
Left + Right Sides
Front
Flue and Rear
Top
Size
inches
cm
inches
cm
inches
cm
inches
cm
ALL
4
10
2
5
6
15
20
51
Minimum
Clearances
from
Adjacent
Construction
Temperature Rise
15°F
8°C
20°F
11°C
25°F
14°C
Size
Flow Rate
Headloss
Flow Rate
Headloss
Flow Rate
Headloss
gpm
l/s
ft
m
gpm
l/s
ft
m
gpm
l/s
ft
m
50
5.3
0.3
0.3
0.1
4.0
0.3
0.2
0.1
3.2
0.2
0.1
0.1
75
8.0
0.5
0.6
0.2
6.0
0.4
0.3
0.1
4.8
0.3
0.2
0.1
100
10.7
0.7
1.3
0.4
8.0
0.5
0.7
0.2
6.4
0.4
0.5
0.2
125
*
13.3
0.8
2.2
0.7
10.0
0.6
1.3
0.4
8.0
0.5
0.8
0.2
150
*
17.0
1.1
2.5
0.8
12.8
0.8
1.8
0.5
10.3
0.6
1.2
0.4
200
*
22.8
1.4
5.0
1.5
17.0
1.0
3.1
0.9
13.7
0.9
1.9
0.6
*
Models 125-200 ship with a low loss header with integral pump, so a separate boiler pump does not need to be sized or fi eld-supplied.
NOTES:
1. Shaded area represents typical temperature rise.
2. gpm = water fl ow in gallons per minute.
3. l/s = water fl ow in liters per second.
4. ft = pressure drop (headloss) through the boiler in feet of water.
5. m = pressure drop (headloss) through the boiler in meters of water.
Sizing
Data
Size MBTU/h
kW
MBTU/h
kW
MBTU/h
kW
%
inches inches
50
50
14.7
42
12.6
37
10.8
84 1-1/4 3/4
75
75
22.0
63
18.8
55
16.1
84 1-1/4
3/4
100
100
29.3
84
24.9
73
21.4
84 1-1/4
3/4
125
125
36.6
105
31.1
91
26.7
84 1-1/4
3/4
150
150
44.0
126
37.2
110
32.2
84 1-1/4
3/4
200
199
58.3
168
49.2
146
42.8
84 1-1/4
3/4
116*
127*
141*
164
176
206
136*
148*
153*
191
202
237
Note: The Net AHRI Water Ratings shown are based on a piping and pickup allowance of 1.15.
*Add approximately 9 Lbs for unit with pump.
Weight
Lbs
Gas
Conn.
Water
Conn.
Net AHRI
Rating
Input
AHRI Certifi ed
Heating Capacity
Natural Gas
AHRI
Certifi ed
AFUE %
Shipping
Weight
Lbs
WARNING
This unit must be electrically grounded in accordance
with the requirements of the authority having jurisdiction
or, in the absence of such requirements, with the latest
edition of the National Electrical Code, ANSI/NFPA 70,
in the U.S. and with the latest edition of CSA C22.1
Canadian Electrical Code, Part 1, in Canada. Do not rely
on the gas or water piping to ground the metal parts of
the boiler. Plastic pipe or dielectric unions may isolate the
boiler electrically. Service and maintenance personnel,
who work on or around the boiler, may be standing on
wet floors and could be electrocuted by an ungrounded
boiler. Electrocution can result in severe injury or death.
WARNING
No Power to be applied to terminals 10-12 of TB1.
Sensor Connections Only!
7.A Safety Warnings
NOTE:
All internal electrical components have been
pre-wired. No attempt should be made to connect
electrical wires to any other location except the
terminal blocks and line voltage hanging leads /
pigtail.
NOTE: Single pole switches, including those of
safety controls and protective devices, must not be
wired in a grounded line.
NOTE: All units with manufacturer recommended and
supplied boiler pumps may be powered using the
supplied voltage.
7.B Main Power, 120V / 15 Amp Circuit
This boiler has a set of wires for the main power
connection. They are located in the area between the
control bezel and the conduit anchor plate. The black
lead for 120V(H), the white for 120V(N) and a green
lead provides an earth ground. Appropriate service
switches and circuit breakers need to be installed prior
to the boiler based on national and local codes having
jurisdiction. The size of the main power supply should
be determined by Table 7. This table indicates the unit’s
Full Load Amperage (FLA), Maximum Overcurrent
Protection and Minimum Circuit Ampacity (MCA). An
overcurrent protection value should be selected based
on these numbers.
CAUTION
Label all wires prior to disconnection when
servicing controls. Wiring errors can cause
improper and dangerous operation.
ATTENTION
Au moment de l'entretien des commandes,
etiquetez tousles fils avant de les debrancher.
Les erreurs de cablage peuvent nuire au bon
fonctionnement et etre dangereuses.
CAUTION
Verify proper operation after operation servicing.
ATTENTION
S'assurer que l'appareil fonctionne adequatement
une fois l'entretien termine.
7.C
Outdoor Sensor
An optional outdoor sensor can be purchased for the
use with the outdoor reset or WWSD with thermal
targeting. See the Accessories List, Section 12.B on
page 50. The sensor must be installed in a shaded
area, preferably on the north side of the structure, and
must be installed above the highest expected snow
line.
To use the outdoor sensor for warm weather
shutdown (WWSD) only:
Connect sensor to WWSD
and COM terminals. The control will then operate in
Economy Mode settings using Thermal Targeting. It
will also shut the boiler off at outdoor temperatures
higher than the selected WWSD temperature.
To utilize Outdoor Reset:
Connect the sensor to OAS
and COM Terminals. The control will then operate
based on the selected Outdoor Reset settings. It will
also shut the boiler off at outdoor temperatures higher
than the selected WWSD temperature.
Once the outdoor sensor is installed, see "8.C Sensor
Programming" on page 33 for how to adjust the
Outdoor Reset using the controller.
M
INI-
T
HERM
JX
Residential Boilers
®
