“Manufactured in North America”
COMFORT PLUS
Model 3120
with ECM Variable Speed
Blower System
Quick Reference Installation Guide
1 PLACEMENT AND CLEARANCES
2 SET-UP
1.
D
A
C
15
60
A
M
P
M
M
STEFFES
2.
3.
60
Top View
Front View
4.
F
E
5.
B
6.
7.
G
WARNING
The area in which the
Comfort Plus is installed
must remain free of debris
and room air should be
maintained at less than
85oF.
3
A
B
C
Back = zero clearance
Front = 36 inches (for servicing)
Right Side = 8 inches (from combustible
material)
D Top = 8 inches (from combustible material)
E Left Side = 4 inches
F Outer Sides of Return and Supply Ducts =
zero clearance
G Bottom = zero clearance
9.
WARNING
• DO remove the Comfort Plus
system from its shipping pallet
before installing.
BRICK LOADING
• DO NOT extend leveling legs more
than one inch.
Starting at the back of the brick
core, load bricks one row at a time
using left side, right side, center
pattern. Place bricks with grooved
side facing up, notch facing forward,
and ridges on left and right.
• DO use and follow generally
accepted safety practices when
handling insulation material.
• Remove loose brick
debris from brick.
• Brick rows MUST line
up front to back
and side to side.
8.
Remove heating elements from base
of system.
Place system in desired location.
Adjust leveling legs to prevent
rocking.
Remove painted front panel of brick
storage cabinet.
Position element wiring harnesses to
avoid damage during brick loading.
Remove galvanized front panel.
Starting at bottom, lift and drape
insulation blankets over top of
system.
Remove front air channel by pulling
out at bottom.
Remove the electrical panel cover
and locate element screw kit and
outdoor sensor.
NOTCH IN BRICK
FR
TO
ON
T
NI
FU
• DO have equipment installed by a
qualified technician in compliance with all applicable local,
state and national codes and
regulations.
• Reference Owner’s and Installer’s
Manual for complete safety,
installation, and operation
instructions.
4
HEATING ELEMENT AND AIR CHANNEL INSTALLATION
WARNING
HAZARDOUS VOLTAGE: Risk of electric shock. Can cause
injury or death.
• DO NOT remove electrical panel cover while system is energized.
• Elements MUST be positioned properly to avoid short circuiting them against any surfaces within system.
• Use care when making connections to avoid element damage.
1.
Insert heating elements between brick layers until element ends
embed into side cutouts of brick cavity. The threaded screw tabs on
wire connection terminals should point forward.
2.
Install air channel with air deflectors (arrow shaped pieces) facing
inward and narrow ends of deflectors pointing up. Place top of air
channel in first.
3.
Lower insulation blankets back into position, one at a time. Tuck
sides into edges, corners and around exposed portions of heating
elements.
4.
Install galvanized panel. Slide the top inside the upper lip of top
painted panel. Bottom rests on the outside of the brick cavity.
5.
Connect wiring harnesses to heating elements using screws in
element screw kit. Install screws with heads up and threads pointing
down. Tighten screws to 14 in·lbs.
6.
Check non-insulated element connections to make sure they do not
come within 1/2" of any surface.
7.
Install painted front panel.
5
Element-to-Wiring
Harness Connections
l
ne
an
Ch
r
i
A
nt
Fro
e
Sid
Assemble factory supplied return air plenum
per the instructions provided with the plenum.
2.
Once assembled, set plenum on right side of
the system with air filter and indoor coil access
covers facing forward. Line up predrilled holes
on system with holes in flanges of plenum and
attach using screws provided in plenum’s
hardware package.
Insert air filter into filter rack.
4.
Connect return air duct to top of plenum.
5.
Connect supply air duct in structure directly to
system’s air outlet.
6.
If necessary, adjust supply air blower speed by
using the chart below.
7.
The W/E jumper MUST be in the ON position or
the blower will not operate with an E call from
the thermostat.
Jumper
½ HP Variable
Speed CFM
1000
1200
1400
1600
tt
Bo
om
WARNING
1.
3.
t
IMPORTANT
DUCTING
NOTE: The 3100 series is factory configured for a right-to-left airflow.
n
Fro
k
Bric
HAZARDOUS VOLTAGE: Risk of electric shock. Can cause injury
or death. DO NOT operate the Comfort Plus heating system
without ducting installed to both the air inlet and outlet.
10 18"
16"
5 3 8"
227 16"
1"
27"
1"
812"
Top of
System
17 8"
•
225 16"
167 16"
2618"
53 5 8"
When interfacing with a heat pump, the A-Coil MUST
be placed on the return air side.
• To maintain a room temperature of 85oF or less in the
mechanical room, a 24" x 24" opening can be installed in the area or a 6" x 6" non-closing register
can be cut into the return air duct. Refer to Placement and Clearance Requirements section of
External static pressure should not exceed .75 inches water column.
Owner’s and Installer’s Manual for more information.
A
B
C
D
2.
Route low voltage wire from load control device to terminal
block.
Connect field wiring to “RP” and “P” positions.
Dry Contact Peak
Control Switch
The maximum coil size the factory supplied return air
plenum can accomodate through the front access is
25.5" (W) x 22" (D) x 29.93" (H). The inner dimensions
of the coil area are 26" (W) x 22" (D) x 30.96" (H).
8
Blower
Speed
P4
Water
R1
Y12 Y2 2 O 2
D2
R2
D1
P10
P5
P3
P2
Peak
Inputs
Aux.
Relay
RP P AP
P1
P8
Air
E J6
A
B
C
D
C3
Y2 J5
D5 D7 D3
R C
J1
J2
J3
J4
P11
O H/E
Y1
The 3120 Comfort Plus heating system can accommodate most heat pump or air conditioner indoor
coils up to a 3 1/2 ton capacity provided the heat
pump or air conditioner is sized in accordance to
supply air delivery rates of the Comfort Plus.
W
W/
AUX Y1 Y2 G
Outdoor
Outdoor
Risk of fire. Any one ducting system MUST
NOT contain more than one air handling
(blower) system.
Comfort Plus
LV Circuit Board
P6
P9
R
C
P7
D6
RLY1
D4
Fid 2
To Control Board
Blower
To Control Board
If utilizing a Steffes Time Clock Module or Power Line
Carrier control, refer to the instructions shipped with that
device for installation information.
LINE VOLTAGE ELECTRICAL CONNECTIONS
B L O W E R S /C O N T R O L S C IR C U IT
C H A R G E C IR C U IT # 1
WARNING
C H A R G E C IR C U IT # 2
HAZARDOUS VOLTAGE: Risk of electric shock. Can cause injury or
death. Do not energize the Comfort Plus heating system until installation is complete.
LINE 2
C ir c u it B r e a k e r s
Full Load Current
• To reduce electromagnetic fields associated with electrical
circuits and to avoid induced voltage on sensors and electronic
devices, the circuit phases MUST be alternated as shown.
Show n for 240VAC only. Circuit deration not included.
Model
• DO NOT install any wiring in the line voltage compartment of
the Comfort Plus heating system unless it is rated for line
voltage.
Control Crct Chrg Crct #1 Chrg Crct #2
3120 - 14.0kW
6.00
29.17
29.17
3120 - 17.0kW
6.00
36.46
36.46
3120 - 21.6kW
6.00
45.00
45.00
LOW VOLTAGE OUTDOOR SENSOR CONNECTIONS
R2
RLY1
Fid 2
Blower
Speed
P4
D2
P10
D1
P5
P3
P2
NC
P8
Comfort Plus
LV Circuit Board
R
P7
P6
D6
D4
Blower
To Control Board
NO
Aux.
Relay
COM
Peak
Inputs
RP P AP
P1
Air
C3
R1
Y12 Y22 O2
Water
D5 D7 D3
R C
E J6
A
B
C
D
P11
O H/E
Y2 J5
W/
AUX Y1 Y2 G
Outdoor
Outdoor
Outdoor Sensor
W
Direct Wired:
1. Mount outdoor sensor in a location where it can accurately
sense outdoor temperature.
2. Route low voltage wire from outdoor sensor to electrical
compartment:
•
Outdoor sensor wire MUST NOT be combined with other
control wiring in a multi-conductor cable.
•
Seal external wall openings.
•
Outdoor sensor lead can be extended to 250 ft.
•
Unshielded Class II (thermostat) wire can be used
provided it is segregated from any line voltage wiring.
3. Connect outdoor sensor wires to the two "OUTDOOR" positions of the low voltage terminal block.
If connecting to the Steffes power line carrier system, follow the installation instructions in the PLC
system’s Owner’s and Installer’s Guide.
J1
J2
J3
J4
The outdoor temperature sensor can be installed by wiring it
directly to the system or to the Steffes power line carrier (PLC)
system.
Y1
9
LINE 1
• To ensure proper operation and safety, all line voltage circuits
must be segregated from low voltage wiring.
LINE 1
Make proper field wiring connections, phasing circuits as shown.
Reference the Unit Identification label for circuit information.
LINE 2
2.
LINE 2
Route all line voltage wires through knockout(s) and into electrical panel.
LINE 1
1.
To Service (Breaker) Panel
WARNING
1.
LOW VOLTAGE PEAK CONTROL
CONNECTIONS
NO
When interfacing a heat pump with the Comfort Plus,
the A-coil MUST be placed in the return air plenum.
7
NC
AIR CONDITIONER/HEAT
PUMP INTERFACE
COM
6
To Control Board
P9
C
10
LOW VOLTAGE ROOM THERMOSTAT CONNECTIONS
A 24 VAC thermostat must be used (digital recommended).
1.
Disconnect power to the Comfort Plus system.
2.
Route low voltage wires from the thermostat to the Comfort Plus System.
3.
Insulate thermostat wire wall opening if necessary and attach thermostat to the wall. When using a mechanical
thermostat or thermostat with anticipator, resistor kit #1190015 must be installed to ensure proper operation.
4.
Connect low voltage wires from thermostat into terminal block as shown.
NOTE: For detailed heat call information, reference the Owner's and Installer's Manual.
Stand Alone Furnace Application with Uncontrolled Air Conditioning
Honeywell
TH5110D
Rc
R
Y
Y
C
C
Air Conditioner
Connections
(If being used in the
application)
W
D1
P10
P4
P5
P3
P2
P8
P9
R
Comfort Plus
LV Circuit Board
C
P7
D6
RLY1
Fid 2
D4
To Control Board
Blower
A
B
C
D
Y1 / Y2
W/E
NO
NC
COM
P1
P6
Blower
Speed
J5
J6
J1
J2
J3
J4
Blower
Speed
D2
R2
Aux.
Relay
RP P AP
Air
R1
Water
Y1
W
C3
J5
J6
D5 D7 D3
Y12 Y2 2 O 2
Y2
E
A
B
C
D
P11
R C
J1
J2
J3
J4
The Y1/Y2 Jumper must be installed
The W/E Jumper must be installed
O H/E
Peak
Inputs
W/
AUX Y1 Y2 G
IMPORTANT
Outdoor
Outdoor
G
To Control Board
Single Stage Heat Pump Application
Honeywell TH5220D
To Heat Pump
Y - Compressor
C - Low Voltage Common
R - Low Voltage Hot
O - Reversing Valve
Outdoor Sensor
R2
Fid 2
D1
P5
P3
P2
P1
Air
P4
D2
P10
P8
A
B
C
D
Y1 / Y2
W/E
P9
Comfort Plus R
LV Circuit Board
P6
Blower
Speed
J5
J6
J1
J2
J3
J4
NO
NC
RP P AP
Aux.
Relay
COM
Y12 Y22 O2
Water
Blower
Speed
E
A
B
C
D
Y2
C3
R1
W
D5 D7 D3
RLY1
R C
J5
J6
O H/E
J1
J2
J3
J4
P11
Y1
The Y1/Y2 Jumper must be installed
The W/E Jumper must be installed
Peak
Inputs
W/
AUX Y1 Y2 G
IMPORTANT
Outdoor
Outdoor
L E Aux G O/B C Y R Rc
C
P7
D6
D4
To Control Board
Blower
To Control Board
Two Stage Heat Pump Application
Honeywell TH5320U
To Heat Pump
R2
RLY1
Fid 2
D6
Blower
Speed
P4
Y1
W
D2
P10
D1
P2
Comfort Plus
LV Circuit Board
A
B
C
D
Y1 / Y2
W/E
Blower
Speed
J5
J6
J1
J2
J3
J4
NO
NC
RP P AP
Aux.
Relay
COM
Peak
Inputs
P1
D4
Blower
11
P3
Air
C3
R1
Y12 Y22 O2
Water
D5 D7 D3
R C
J5
J6
P11
O H/E
Y2
E
A
B
C
D
The Y1Y2 Jumper must be removed
The W/E Jumper must be installed
W/
AUX Y1 Y2 G
J1
J2
J3
J4
IMPORTANT
L Y2 Aux G O/B C Y R Rc
Outdoor
Outdoor
Y1 - Compressor Stage 1
Y2 - Compressor Stage 2
C - Low Voltage Common
R - Low Voltage Hot
O - Reversing Valve
To Control Board
To Control Board
SOFTWARE CONFIGURATION AND INSTALLERS FINAL CHECKOUT
To ensure proper operation, the system software must be configured for the application. Refer to the Configuration Menu
in the Owner's and Installer's Manual or to the Configuration Guide provided by your local power company. Also, complete the
Installer's Final Checkout Procedure found in the Owner's and Installer's Manual.
3050 Hwy 22 North w Dickinson, ND 58601-9413 w www.steffes.com
Part No. 1200285-6