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
.70 A
.20 A
MCA
.9 A
.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
Heating Capacity AFUE % Water Gas
Input
Nat Gas
Conn. Conn.
Size
MBTU/h
kW
MBTU/h
kW
%
in.
in.
50
50
14.7
42
12.6
84 1-1/4 3/4
75
75
22.0
63
18.8
84 1-1/4
3/4
100
100
29.3
84
24.9
84 1-1/4
3/4
125
125
36.6
105
31.1
84 1-1/4
3/4
150
150
44.0
126
37.2
84 1-1/4
3/4
200
199
58.3
168
49.2
84 1-1/4
3/4
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.
7.A Safety Warnings
Single pole switches, including those of safety
controls and protective devices, must not be wired
in a grounded line.
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.
7.B Main Power, 120V
Main Power Connection: 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.
NOTE: all units with Manufacturer recommended
and supplied boiler pumps may be powered using
the supplied voltage.
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 use
with the outdoor reset or thermal targeting features
that are built into the boiler's control system. (See the
Accessories List in Section 12.B on page 49). 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.1
Programming the Outdoor Sensors" on page 32 for
how to adjust the Outdoor reset using the controller.
M
INI-
T
HERM
JX
Residential Boilers
®
