ICP MF080014C User manual

These instructions must be read and understood completely before attempting installation.
SAFETY CONSIDERATIONS
Improper installation, adjustment, alteration, service,
maintenance, or use can cause explosion, fire, electrical shock,
or other conditions which may cause death, personal injury, or
property damage. Consult a qualified installer, service agency, or
your distributor or branch for information or assistance. The
qualified installer or agency must use factory-authorized kits or
accessories when modifying this product. Refer to the individual
instructions packaged with the kits or accessories when
installing.
Follow all safety codes. Wear safety glasses, protective clothing,
and work gloves. Use quenching cloth for brazing operations.
Have fire extinguisher available. Read these instructions
thoroughly and follow all warnings or cautions included in
literature and attached to the unit. Consult local building codes,
the current editions of the National Electrical Code (NEC) NFPA-
70.
TABLE OF CONTENTS
In Canada refer to the current editions of the Canadian Electrical
Code CSA C22.1 Recognize safety information.
This is the safety-alert symbol Z_. When you see this symbol on
the unit and in instructions or manuals, be alert to the potential
for personal injury. Understand these signal words; DANGER,
WARNING, and CAUTION. These words are used with the
safety-alert symbol. DANGER identifies the most serious
hazards which will result in severe personal injury or death.
WARNING signifies hazards which could result in personal
injury or death. CAUTION is used to identify unsafe practices
which may result in minor personal injury or product and property
damage. NOTE is used to highlight suggestions which will result
in enhanced installation, reliability or operation.
General Information/Installation .......................................... 2
Installation ............................................................................. 2
Vertical/Horizontal Installation ............................................. 3
Ductwork Connection ............................................................ 4
Filter Installation .................................................................... 4
Electrical Connection ............................................................. 4
Blower Performance .............................................................. 8
Sequence of Operation ........................................................ 10
Wiring Diagram .................................................................... 11
Replacement Parts .............................................................. 12
ELECTRICALSHOCK HAZARD
Failure to turn off electric power could result in
personal injury or death.
Before installing or servicing system, turn off main
power to the system. There may be more than one
disconnect switch, including accessory heater(s}.
April 2012 Specifications subject to change without notice. X40159 Rev.C

Figure i Nominal Installation Dimensions and Clearances-in(ram)
Low Voltage
Entrance
14-3/16" (360/- MFO8
17.112" (445/- MF12
21" (533/- MF16
24-1/2" (622/- MF20
314" (19)
12-7/16" (316/- MF08
15-3/4" (400)- MF12
19-1/4" (489)- MF16
22-3/4" (578)- MF20
Line Voltage | 24" (610)- MFO8 & MF12
Entrance l25" (635)- MF16 & MF20
CLEARANCES
NO HEATERS
All Sides...0"
From Supply Duct_.0"
Recommended Service From Front_.20"(508 mm)
(Service for blower, filter if installed)
WITH HEATERS
All Sides...O"
From First Three Feet of Supply Duct
to Combustibles...1" (25ram)
From Duct after Three Feet...0"
Recommended Service From Front...20" (508mm)
(Service for blower, heaters if installed)
Fire Hazard
Failure to follow this warning could result in
personal injury, death, and/or property damage.
When heaters are installed maintain clearances
from combustible materials as specified on unit
rating plate. Do not use plastic lined or combustible
flexible ducting within 36" (914 mm) of the supply
end of the modular unit.
GENERAL INFORMATION
DEATH, PERSONAL INJURY, AND/OR PROPERTY DAMAGE
HAZARD
Failure to carefully read and follow this warning could result
in equipment malfunction, property damage, personal injury
and/or death.
The information contained in this manual is intended for use
by a qualified service technician familiar with safety
procedures and equipped with the proper tools and test
instruments.
Installation must conform with local building codes and with
the National Electrical Code NFPA70 current edition.
INTRODUCTION
The MF modular blower cabinet uses a 208/230V PSC blower motor,
with an electronic fan control board. The MF may be used for cooling
or heat pump applications either with or without electric heat.
Installations without electric heat require a NO HEAT KIT
(EHIA00KN10). The cabinet can be installed in an upflow, downflow
or horizontal position. Refer to Figure 3 and 4.
LOCATION
Select the best position which suits the installation site conditions.
The location should provide adequate structural support, space in
the front of the unit for service access, clearance for return air and
supply duct connections, space for refrigerant piping connections
and condensate drain line connections. If heaters are being installed,
make sure adequate clearance is maintained from supply ductwork;
See Clearances and Warning in Figure 1.
If the unit is located in an area of high humidity, nuisance sweating of
casing may occur. On these installations a wrap of 2" (51mm)
fiberglass insulation with a vapor barrier should be used.
HEATER PACKAGES
Factory approved, field installed, UL listed heater packages are
available from the equipment supplier. See unit rating plate for a list
of factory approved heaters (electric heat accessory models EHIA
only). Heaters that are not factory approved could cause damage
which would not be covered under the equipment warranty.
CUT HAZARD
Failure to follow this caution may result in personal injury.
Sheet metal parts may have sharp edges or burrs. Use care
and wear appropriate protective clothing and gloves when
handling parts.
INSTALLATION
The unit is ready to install in any position without modifications.
Refer to the coil instructions for information on drain pan
configurations etc. Make sure coil is set up properly for desired
position of blower cabinet.
Coil must be secured to blower cabinet with the three tabs that are
part of the blower cabinet base. Bend the tabs out from the bottom
so they fit over the coil cabinet.
Position coil cabinet in relation to the blower so they will be correct
for desired application.
2 Specifications subject to change without notice. X40159 Rev.C

For upflow and horizontal applications apply foam seal strip around
top of coil cabinet. For downflow application apply foam seal strip
around bottom of coil cabinet. Set blower on top of coil cabinet so
they are flush. Secure cabinets together using the three tabs on the
bottom of the cabinet. Bend the tab out from the bottom so it fits over
the coil cabinet. If no pilot holes are present, drill a hole as required
for a screw.
Figuie 2 AttachCoil to BlowerCabinet
Panelsremoved
for clarityonly
Placeseal
on topof
CoilCabinet
around
perimeter
JAirflow Positions
F-
I'EA"I_J_
Subbase
Accessory 4t
4
DOWNFLOW INSTALLATIONS
Refer to instructions with Subbase Kit.
NON-DUCTED RETURN AIR CLOSET
INSTALLATION
The cabinet can be installed in a closet with a false bottom to form a
return air plenum, or mounted on an open platform inside the closet.
Platform should be high enough to provide a free (open) area for
adequate return airflow into the bottom of the cabinet. The open area
can be on the front side or a combination of front and sides,
providing there is clearance on the sides between cabinet and
closet. Refer to ACCA Manual D for sizing and free area
recommendations.
NOTE: Local codes may limit application of systems without a
ducted return to single story dwellings.
HORIZONTAL LEFT AND RIGHT
INSTALLATIONS
The modular blower cabinets can be installed in either downflow,
horizontal left or horizontal right applications. When a coil cabinet is
applied, refer to the coil installation manual for proper drain pan and
airflow requirements. They must have the drain pan repositioned for
right hand airflow. Refer to coil installation manual.
PROPERTY DAMAGE HAZARD
Failure to follow this caution may result in property damage.
Afield fabricated auxiliary drain pan, with a separate drain is
REQUIRED for all installations over a finished living space or
in any area that may be damaged by overflow from a
restricted main drain pan. In some localities, local codes
require an auxiliary drain pan for ANY horizontal installation.
Figure4 J Airflow Positions
iI
SUSPENDED CABINET INSTALLATION
1. The cabinet may be supported on a frame or shelf, or it may be
suspended.
X40159 Rev.C Specifications subject to change without notice. 3

2. Usemetalstrappingorthreadedrodwithangleironsupports
undertheauxiliarydrainpantosuspendcabinet.Thesesupports
MUST run parallel with the length of the cabinet. Refer to Figure
5.
3. Ensure that there is adequate room to remove service and
access panels after installing supporting brackets.
4. Place field installed vibration isolators in auxiliary drain pan to
support cabinet.
DUCT CONNECTIONS
Supply Duct
Supply duct must be attached to the outside of flange on outlet end
of unit. Flexible connectors may be used if desired. Maintain
clearances from supply duct to combustibles when heaters are
installed. Refer to Figure 1 and unit rating plate.
Return Duct
Return duct should be attached to bottom of unit using sheet metal
screws or other fasteners.
FILTER INSTALLATION
Filters must be field supplied. A remote filter grille or other means
must be provided. Refer to ACCA Manual D for remote filter sizing.
Figure 5 Horizontal Installation
see Note
Below
, rnT
_ '\ /_ _ Refrigerant
....._ _\'_ \Lines
Vibration Field-Fabricated
DrainPan _-_-_
Isolators
Supports MUST run parallel with blower cabinet
NOTE: If increased structural strength is needed in the horizontal
position, use field supplied two connecting plates in place of the tabs
on the bottom of the blower.
ELECTRICAL CONNECTIONS
The MF modular blower utilizes an electronic fan control board which
has a low voltage circuit protective fuse (5 AMP), and pigtail
connections for thermostat hook up. The fan control also has a relay
for blower operation, and built in 90 second blower-off time delay
relay (TDR). To disable the TDR feature, snip the jumper wire JWI.
Refer to Figure 6.
All electrical work MUST conform with the requirements of local
codes and ordinances and the National Electrical Code NFPA 70
current edition.
The low voltage transformer and the fan control are standard on all
models and are prewired at the factory. Line voltage connections are
made to the heater accessory or the lugs on the No Heat Kit.
ELECTRICAL SHOCK or UNIT DAMAGE HAZARD
Failure to follow this warning could result in personal injury,
death, and/or property damage.
If a disconnect switch is to be mounted on unit, select a
location where drill and fasteners will not contact electrical
refrigeration components.
Figure 6Fan Control Board
OVERCURRENTPROTECTION
The power supply wiring to the unit MUST be provided with
overcurrent protection. Governing codes may require this to be fuses
ONLY or circuit breakers.
For blower cabinets without heaters, a 15 amp circuit may be used.
Before proceeding with electrical connections, make certain that
supply voltage, frequency, phase, and circuit ampacity are as
specified on the unit rating plate. See unit wiring label for proper field
high and low voltage wiring. Make all electrical connections in
accordance with the NEC and any local codes or ordinances that
may apply. Use copper wire only. The unit must have a separate
branch electric circuit with a field-supplied disconnect switch located
within sight from and readily accessible from the unit.
NOTE: When a pull-out type disconnect is removed from the unit,
only the Load side of the circuit is de-energized. The Line side
remains live until the main (remote) disconnect is turned off.
4Specifications subject to change without notice. X40159 Rev.C

ELECTRICAL SHOCK or UNIT DAMAGE HAZARD
Failure to follow this warning could result in personal injury,
death, and/or property damage.
Turn OFF electric power at fuse box or service panel before
making any electrical connections and ensure a proper
ground connection is made before connecting line voltage.
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury
or death.
Turn OFF the main (remote) disconnect device before
working on incoming (field) wiring. Incoming (field) wiring on
the line side of the disconnect found in the modular blower
unit remains live, even when the pull-out is removed. Service
and maintenance to incoming (field) wiring cannot be
performed until the main disconnect switch (remote to the
unit) is turned off.
MF units installed without electric heat require the use of a factory-
authorized No Heat Kit (accessory part number EHIA00KN 10). This
kit provides the electrical connections necessary to supply the unit
with 208/230V power when electric heat is not present.
For units without electric heat:
1. Locate adapter and filler plates with screws inside package. If
necessary, adjust plates to allow for installation of No Heat Kit
required inside cabinet. Refer to Figure 7,
2. Secure No Heat Kit accessory with four (4) screws.
3. Connect the 9-pin plug from No Heat Kit wiring into the
receptacle that attaches to fan control board.
4. Connect ground wire to unit ground lug.
5. Connect 208/230V power lead from field disconnect to No Heat
Kit. Heater Installation
For units with electric heat, see Electric
Instructions and blower airflow requirements.
NOTE: Transformer is factory-wired for 230V operation. For 208V
applications the transformer must be rewired to the 208V tap. Refer
to unit wiring label.
GROUNDING CONNECTION
Use a copper conductor(s) from the ground lug on the No Heat Kit
or ground lugs on the electric heater to a grounded connection in
the electric service panel or a properly installed grounding rod.
Low Voltage Control Connections
Wire low-voltage in accordance with wiring label on the blower (also
refer to Figures 8 - 12. Use 18 AWG color-coded, insulated (35_C
minimum) wire to make the low-voltage connections between:
thermostat, indoor equipment, and outdoor equipment. If thermostat
is located more than 100 feet (31m) from the unit (as measured
along the low voltage wire), use 16 AWG color-coded, insulated
(35_C minimum) wire. All wiring must be NEC Class 1 and must be
separated from incoming power leads. Refer to outdoor unit wiring
instructions for additional wiring recommendations.
Field supplied low-voltage wiring should be field connected inside
control splice box area (secure with wire nuts), and strain relief
bushing or rubber grommet to seal cabinet opening.
Figure7 J Electrical Controls
LowVoltage
Connections
\,
FillerPlate
Adapter Plate
\
No Heat Kit _\
Ground
Connection Control Splice Box
X40159 Rev.C Specifications subject to change without notice. 5

Table1
MF08* 208
23O
MF12* 208
23O
MF16* 208
23O
MF20* 208
230
Supply Circuit
Volts Phase
Supply
Circuit
No.
Max. MCA Max
Motor Branch Over-
Amps Circuit current
Protectio
nDevise
(Amps)
3.1 15
H.P.
60 Single 1/3 2.5
AMP
# of
Wires
Recommended
Supply Wire Ground Wire
75°C copper
Min Max. Ft.(m) # of Min
Size Length Wires Size
14 105 (32) 1 14
14 105 (32) 1 14
14 105 (32) 1 14
1 14
14 90 (27)
Hertz
60 Single 1/2 2.9 3.6 15
60 Single 1/2 2.9 3.6 15
60 Single 3/4 6.0 7.5 15
'guii
THERMOSTAT
E3-
D
Wiring Layout Air Conditioning Unit
RED
GRY
(Cooling Only)
R
G
W2
W3
E
CAIRCOND.
Wiring Layout Air Conditioning Unit
(Cooling and Single-Stage Heat)
THERMOSTAT m
RED R
_, GRY G
W3
E
AIRCOND.
Wiring Layout Heat Pump Unit (Cooling
and Single-Stage Heat with No Outdoor
Thermostat)
THERMOSTAT
[_ Lvlo
Fq
ITt---
R
G
C
W2
W3
E
HEATPUMP
(CONTROL)
z;_ R
_- w 2
_-o
6Specifications subject to change without notice. X40159 Rev.C

Wiring Layout Heat Pump Unit (Cooling and
Two-Stage Heat with One Outdoor
Thermostat)
THERMOSTAT
mD-
J3-
D-
E3-
[-q
Fq
E]-
D-
m
R
G
c
W2
E
W3- ODTS
z;:5._
HEATPUMP
(CONTROL)
R
c
w2
o
Y
-.-t.igure 1z I Wiring Layout Heat Pump Unit (Cooling and
1Two-Stage Heat with Two Outdoor Thermostats)
THERMOSTAT
m
D-
%
Fq
_WHTVlO
PINK
m
R
G
C
W2
E
w3.....2.__
HEAT PUMP
(CONTROL)
4Q_ R
L __c
o Lw2
ODTS
£___y
CHANGING MOTOR SPEED
To change the blower speed, disconnect the black wire at the
blower motor terminal block and reconnect at the desired blower
speed tap (refer to Table 4).
HEATER STAGING
The modular controls are factory circuited for single-stage electric
heat operation. Refer to Table 2 for available heaters and Table 3
for unit airflow based without a coil, filter, or electric heat applied.
When two-stage electric heat is desired (refer to Table 2 - Heat
Strip Staging), separate out the pink W3 wire from W2 & E
connections. Refer to Table 2-2 and wiring diagram Figure 11. W3
can be separated and controlled by the indoor wall thermostat (if
multi-stage capable), or by an outdoor thermostat (ODTS). Refer to
ODTS kit instruction for proper wiring.
When three-stage electric heat is desired, cut the W2 wire nut off
and discard. Strip W2, W3, and E. Refer to Table 2-3, and wiring
diagram Figures 12. Connect according to the thermostat kit
instructions or ODTS kit instructions for proper wiring.
Table 2 Heat Strip Staging
2-1 2-2
Single-Stage Two-Stage
Operation Capable
(no staging - all
electric heat
Single- EHIA05KB /KN EHIA15KB
Phase EHIA07KB /KN EHIA20KB
EHIA10KB /KN EHIA25KB
EHIA15KB
EHIA20KB
EHIA25KB
Three- EHIA10HB EHIA10HB
Phase EHIA15HB EHIA15HB
EHIA20HB EHIA20HB
EHIA25HB EHIA25HB
KB is single-phase with circuit breaker
KN is single-phase with terminal block (no-breaker)
HB is three-phase with circuit breaker
2-3
Three-Stage
Capable
(with ODTS
only)
EHIA25KB10
EHIA20HB
EHIA25HB
Table 3 Minimum Motor Speed Tap Selection For
Electric Heater
Electric Heater SIZE kW
Model 5 kW 7.5 kW 10 kW 15 kW 20 kW 25 kW
MF08 LOW LOW LOW MED ....
MF12 LOW LOW LOW LOW MED --
MF16 LOW LOW LOW MED MED HIGH
MF20 LOW LOW LOW LOW LOW MED
LOW = low speed tap selection
MED = medium speed tap selection
HIGH - high speed tap selection
AIR FLOW CHECK
For proper system operation, the air flow through the indoor coil
should be between 350 and 450 cfm per ton of cooling capacity.
The air flow through the unit can be determined by measuring the
external static pressure to the unit and selecting the motor speed
tap that will most closely provide the required air flow.
1. Set up to measure external static pressure at the supply and
return duct connections. Refer to Figure 13.
2. Drill holes in the ducts for pressure taps, pilot tubes, or other
accurate pressure sensing devices.
3. Connect these taps to a level inclined manometer or draft
gauge.
4. Ensure the coil and filter are clean, and all the registers are
open.
5. Determine the external static pressure with the blower
operating.
X40159 Rev.C Specifications subject to change without notice. 7

7.
8.
Refer to the Air Flow Data, Table 4, to find the speed setting
that will most closely provide the required air flow for the
system.
Refer to Motor Speeds and Airflow in these instructions if the
speed is to be changed.
Recheck the external static pressure with the new setting, and
confirm speed switch selection.
StaticPressoroCheck
TEMPERATURE RISE CHECK
Temperature rise is the difference between the supply and return air
temperatures.
NOTE: The temperature rise can be adjusted by changing the
heating speed tap at the unit's blower terminal block. Refer to the
unit's Installation Instructions for airflow information.
A temperature rise greater than 60°F (33,3°C) is not
recommended.
1. To check the temperature rise through the unit, place
thermometers in the supply and return air ducts as close to the
unit as possible,avoiding direct radiant heat from the heater
elements.
2. Open ALL registers and duct dampers.
3. Set thermostat Heat-Cool selector to HEAT.
4. Set the thermostat temperature setting as high as it will go.
5. Turn electric power ON.
6. Operate unit AT LEAST 5 minutes, then check temperature
rise.
NOTE: The maximum outlet air temperature for all models is 200°F
(93.3°C).
7. Set thermostat to normal temperature setting.
8. Be sure to seal all holes in ducts if any were created during this
process.
Airflow Based on no coil, no filter, no electric heat. Deduct heater static shown in heater static table.
Deduct coil static, See Coil Specification Sheet. Deduct .20 in wc (50 Pa) for Downflow Subbase Kit.
Table 4 Airflow is blower only, no coil attached
MF08 In wc
SPEED VOLTS 0.20 0.30 0.40 0.50 0.60 0.70 0.80
230v 1029 1020 1007 985 960 915 862
Low 208v 872 860 845 825 797 765 721
230v 1286 1270 1254 1220 1180 1125 1058
Med 208v 1113 1105 1091 1070 1042 1000 947
230v 1500 1470 1432 1380 1315 1250 1168
High 208v 1317 1305 1286 1255 1220 1170 1008
MF012 In wc
SPEED VOLTS 0.20 0.30 0.40 0.50 0.60 0.70 0.80
Low 230v 973 975 979 979 973 955 931
208v 811 815 816 810 797 780 749
Med 230v 1284 1295 1301 1305 1302 1280 1246
208v 1084 1084 1084 1090 1089 1065 1030
High 230v 1663 1670 1671 1655 1631 1585 1519
208v 1383 1385 1390 1390 1383 1365 1328
MF16 In wc
SPEED VOLTS 0.20 0.30 0.40 0.50 0.60 0.70 0.80
Low 230v 1020 1015 1009 1002 991 975 950
208v 858 845 830 815 801 780 749
Med 230v 1379 1385 1386 1379 1364 1343 1309
208v 1156 1154 1149 1144 1134 1120 1098
High 230v 1776 1782 1783 1765 1736 1698 1643
208v 1496 1496 1496 1495 1495 1470 1433
MF20 In wc
SPEED VOLTS 0.20 0.30 0.40 0.50
Low 230v 1492 1495 1492 1475
208v 1246 1245 1238 1225
Med 230v 1969 1955 1935 1890
208v 1641 1640 1633 1615
High 230v 2696 2600 2492 2350
208v 2417 2355 2287 2200
0.60 0.70 0.80
1451 1395 1308
1203 1175 1125
1818 1700 1570
1584 1510 1406
2192 2020 1844
2092 1940 1774
DEDUCT STATIC PRESSURE OF COIL
* THE MAXIMUM EXTERNAL STATIC PRESSURE IS 0.8" W.C., WITHOUT COOLING
FOR MAXIMUM STATIC PRESSURE. COIL.
8Specifications subject to change without notice. X40159 Rev.C

I Table 5 - ELECTRIC HEATHER STATIC PRESSURE DROP I
Three-Phase
Single-Phase
EHIA EHIA EHIA EHIA EHIA EHIA
CFM 05 07 10 15 20 25
In wc
600 0.01 0.01 0.01 - - -
700 0.01 0.01 0.01 - - -
800 0.01 0.01 0.01 0.01 - -
900 0.01 0.01 0.01 0.01 - -
1000 0.01 0.01 0.01 0.01 0.02 -
1100 0.01 0.01 0.01 0.02 0.02 -
1200 0.01 0.01 0.01 0.02 0.02 -
1300 0.01 0.02 0.02 0.02 0.02 -
1400 0.01 0.02 0.02 0.02 0.03 0.03
1500 0.01 0.02 0.02 0.02 0.03 0.04
1600 0.01 0.02 0.02 0.03 0.03 0.04
1700 0.01 0.02 0.02 0.03 0.03 0.04
1800 0.01 0.02 0.02 0.03 0.04 0.04
1900 0.01 0.02 0.02 0.03 0.04 0.05
2000 0.01 0.02 0.02 0.03 0.04 0.05
EHIA EHIA EHIA EHIA
CFM N/A N/A 10 15 20 25
In wc
600 __ 0.01 - - -
700 __ 0.01 - - -
8oo__ OOl OOl - -
900 __ OOl OOl - -
lOOO__ OOl OOl 002 -
1100__ 001 002 002 -
1200__ 001 002 002 -
1300__ 002 002 002 -
1400__ 002 002 003 003
1500__ 002 002 003 004
1600 __ 0.02 0.03 0.03 0.04
1700 __ 0.02 0.03 0.03 0.04
1800__ 002 003 004 004
1900__ 002 003 004 005
2000__ 002 003 004 005
ACCESSORIES
ELECTRIC AIR CLEANER
The Electronic Air Cleaner may be connected to MF as shown in
Figure 14. This method requires a field supplied transformer. See
Electronic Air Cleaner literature for kit requirements.
Wiring Layout of Electronic Air
Figure 14 Cleaner to Modular Blower
CONTROL BOARD
/
FANR:ELA¥ I R G T C C C
°iiI" li!!ll
SPT N©NC ii
W_RE
NUT
_ ................. _M
""°°°'"24VAC
CONVERSION KIT ,..,>.,.,,L._.,J
BLOwERTOTRANSFORMER I I I I
MOTOR i i l OOM
TO EAC FROM I_YOLEX
PLUG AND
_P_oNSFORMER
(IN UNIT)
HUMIDIFIER
Connect humidifier and humidistat to modular blower unit as shown
in Figures 15 and 16.
Figure 15 Wiring Layout of Humidifier to Modu-
lar Blower with Electric He_t
THERMOSTAT
%.....
MODU_ BLOWER
3ONTROL}
X40159 Rev.C Specifications subject to change without notice. 9

Figure 16 Wiring Layout of Humidifier to Heat
Pump
_DULAR BLOWER HEATPUMP
(3ONTR_ L) (CONTROL}
F-_,_, _PR R
[] ............ _Ry G
r-q..... c ...............c
D I o
SEQUENCE OF OPERATION
A. CONTINUOUS FAN
Thermostat closes R to G. G energizes fan relay on FAN
CONTROL BOARD which completes the high voltage circuit to
indoor blower motor. When G is de-energized, there is a built in 90
second blower-off time delay relay (TDR). To disable the TDR
feature, snip the jumper wire JW1.
B. COOLING MODE
Air Conditioner Only:
Thermostat energizes R to G and Y. G energizes fan relay on fan
control board which completes high-voltage circuit to indoor blower
motor. Y energizes the 24 low-voltage contactor in condensing unit.
When call is satisfied, Y drops out and there is a 90 second blower
TDR before fan relay opens.
Heat Pump:
Same as above - except thermostat will also energize O for
reversing valve operation in cooling mode. O will typically remain
energized by the thermostat (after cooling call is satisfied), or until
the mode is changed to heating.
C. HEAT PUMP
Coolinq Mode:
Thermostat energizes R to G, Y and O. G energizes indoor an relay
on fan control board which completes high-voltage circuit to indoor
blower motor. Y energizes the outdoor 24V low-voltage circuit in
heat pump to energize compressor. O energizes reversing valve in
cooling mode and typically remains energized until the mode is
changed to heating. When thermostat cooling call is satisfied. Y
drops out. O remains energized, and there is a 90 second TDR
before indoor fan relay opens.
Heatinq Mode:
Thermostat energizes R to G and Y only (no O signal in heating). G
energizes indoor fan relay on fan control board which completes
high-voltage circuit to indoor blower motor. Y energizes the outdoor
24V low-voltage circuit in heat pump to energize compressor. The
reversing valve is not energized in heating unless a defrost cycle
should occur. When call is satisfied, Y drops out and there is a 90
second TDR before indoor fan relay opens.
D. HEAT PUMP HEATING WITH AUXILIARY
ELECTRIC HEAT
Coolinq Mode:
Same operation as above in Heat Pump Cooling Mode.
Heatinq Mode:
Same operation as above in Heat Pump Heating Mode with the
addition of W. Thermostat energizes R to G, Y, and W. W energizes
electric heat relay(s) which completes circuit to heater element(s).
When W is de-energized, electric heat relay(s) open, turning off
heater elements. The White wire in pigtail connects W2, W3, and E
together. This may be separated for heater staging when available,
see electric heat kit for more information.
E. ELECTRIC HEAT OR EMERGENCY HEAT MODE
Thermostat closes R to W. W energizes electric heat relay(s) which
completes circuit to heater elements(s). Blower motor is energized
through N.C. (normally closed) contacts on fan relay. When W is
de-energized, electric heat relay(s) opens.
CARE AND MAINTENANCE
The system should be regularly inspected by a qualified service
technician. Consult the servicing dealer for recommended
frequency. Between visits, the only consumer service
recommended or required is air filter maintenance and condensate
drain operation.
AIR FILTER
Inspect air filters at least monthly and replace or clean as required.
Disposable type filters should be replaced. Reusable type filters
may be cleaned by soaking in mild detergent and rinsing with cold
water. The frequency of cleaning depends upon the hours of
operation and the local atmospheric conditions. Install filters with
the arrows on the side pointing in the direction of air flow. Clean
filters keep unit efficiency high.
LUBRICATION
The bearings of the blower motor are permanently lubricated.
CONDENSATE DRAINS
During the cooling season check the condensate drain lines to be
sure that condensate is flowing from the primary drain but not from
the secondary drain. If condensate ever flows from the secondary
drain, the unit should be promptly shut off and the condensate pan
and drains cleaned to insure a free flowing primary drain.
10 Specifications subject to change without notice. X40159 Rev.C