ICP Package Units(both Units Combined) Manual L0611131
User Manual: ICP ICP Package Units(both units combined) Manual ICP Package Units(both units combined) Owner's Manual, ICP Package Units(both units combined) installation guides
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Installation Instructions
PAM3 SERIES
PACKAGE AIR CONDITIONERS
TABLEOF CONTENTS
SAFETYLABELINGANDSIGNALWORDS ....................... 2
UNITDIMENSIONS ......................................... 3
SAFEINSTALLATIONREQUIREMENTS ......................... 3
LOCATINGTHE UNIT ....................................... 3
CLEARANCES ............................................ 4
INSTALLATION............................................ 4
INSTALLINGDUCTCOLLARS................................. 4
CONDENSATEDRAIN....................................... 5
UNITELECTRICALWIRING .................................. 5
LINEVOLTAGE............................................ 5
CONVERTING230VTO208V ................................. 6
LOWVOLTAGEWIRING ..................................... 6
THERMOSTATCONNECTIONS ................................ 6
FINALELECTRICALCHECK.................................. 6
CONTROLBOXCONFIGURATIONANDWIRING ................... 7
WIRINGDIAGRAMS ........................................ 8
RAINSHIELDINSTALLATION................................ 10
AIR DISTRIBUTIONSYSTEM................................. 10
DUCTWORK............................................. 10
FILTERS................................................ 10
START-UP PROCEDURES.................................. 1!
SPEEDTAPS ............................................ 1!
CHECKBEFORESTARTING................................. 1!
DEFROSTINTERVAL ...................................... 12
SEQUENCEOF OPERATION................................. 12
OPERATION ............................................. 12
0 us
LISTED
Printed in U.S.A. 11/8/05 426 01 1101 0O
1. Safety Labelinq and Siqnal Words
Danger, Warning and Caution
The signal words DANGER, WARNING and CAUTION are
used to identify levels of hazard seriousness. The signal
word DANGER is only used on product labels to signify an
immediate hazard. The signal words WARNING and
CAUTION will be used on product labels and throughout
this manual and other manuals that may apply to the
product.
Danger Label
White lettering on a black background except the word
DANGER which is white with a red background.
Signal Words
DANGER - Immediate hazards which WILL result in
severe personal injury or death.
WARNING - Hazards or unsafe practices which COULD
result in severe personal injury or death.
CAUTION - Hazards or unsafe practices which MAY result
in minor personal injury or product or property damage,
Warning Label
White lettering on a black background except the word
WARNING which is black with an orange background,
Signal Words in Manuals
The signal word WARNING is used throughout this manual
in the following manner:
The signal word CAUTION is used throughout this manual
in the following manner:
Product Labeling
Signal words are used in combination with colors and/or
pictures on product labels. Following are examples of
product labels with explanations of the colors used,
Caution Label
White lettering on a black background except the word
CAUTION which is black with a yellow background,
2 426 01 1101 00
2. Dimensions
DIMENSIONS Unit
PAM324/30
PAM336to 54
ADim.
32-3/8 (821)
40-3/8 (1025)
IIIIII I I il I I
RlllllllilII
RIIIIIIIilII
BIIIIIIIilII
_IIIIIII'III
RIIIIIIIIII
RIIIIIII,III
_lllllllilII
_lllllllilII
lllllllllilII
,.,,,,,,.,, _.
PRESSURE!
PORTS L_
COIL
ACCESS
PANEL
CONNECTION
3O"
(763)
51"
(1295)
7/6"LowVoltageWiring
F(22)
Alldimensionsin inches(mm)
ROUNDFLANGEWILL
ACCOMMODATE14"DIA.
RETURNDUCT
(301) (232)
41-1/8"
(lO45)
1-3/8"
(36)
36-1/3" 1-1/4"
(923)
1-1/4"
(33)*
(35)*
* ELECTRICALACCESSFOR UNE VOLTAGEPOWERSUPPLY-ONEFORUNIT,ONE FORHEATER
3. Safe Installation Requirements
FIRE, EXPLOSION, ELECTRICAL SHOCK HAZARD
Installation or repairs made by unqualified persons can
result in hazards to you and others. Installation MUST
conform with local building codes or, in the absence of
local codes, with the ANSI Z223.1 and the National Elec-
trical Code NFPAT0-current edition or in Canada the
National Standard CAN/CGA B149-1 and CSA C.22.1 -
Canadian Electrical Code Part 1.
Failure to carefully read and follow all instructions in
this manual could result in furnace malfunction, prop-
erty 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.
• Seal supply and return air ducts.
42601 1101 oo
• Check to see that filters are installed correctly and are the
proper type and size.
NOTE: It is the personal responsibility and obligation of the
customer to contact a qualified installer to ensure that the
installation is adequate and conforms to governing codes and
REDUCED UNIT LIFE HAZARD
Failure to follow this caution may result in
property damage
Do NOT operate unit in a corrosive atmosphere con-
taining chlorine, fluorine, or any other corrosive
chemicals.
4. Locating The Unit
The unit is designed for outdoor installation only. Place the unit on
a platform at ground level. The unit may be installed on a concrete
slab of 48" (1219mm) x 48" (1219mm) dimensions. Concrete
blocks on a 3" sand footing will also work. The slab or blocks
3
ordinances.
SHOULD NOT be in contact with any part of the structure. Check Installation
local codes covering zoning, noise, platforms, etc..
Avoid locating next to fresh air intakes, vent or bedroom windows.
Noise may carry into the openings and disturb people inside.
Avoid installations under roof overhangs without guttering. Water
draining from the roof onto the unit could produce excessive
noise, and may cause ice to build up on coil or fan.
Placement of the unit should be in a well drained area or the unit
MUST be supported high enough so runoff will not enter the unit.
Do not locate unit where heat, lint or exhaust fumes wil! be
discharged on unit (as from dryer vents.)
Clearances
Minimum clearances, as specified in FIGURE 1, MUST be
maintained from adjacent structures to provide adequate air
circulation and room for service personnel.
While minimum clearances are acceptable for safety reasons,
they may not allow adequate air circulation around the unit for
proper operation. Whenever possible, it is desirable to allow
additional clearance, especially around the condenser inlet and
discharge openings.
Do NOT install the unit in a recessed or confined area that will
permit discharged air from the condenser to recirculate to the
condenser inlet.
Minimum Clearances to Combustible Construction
SERVICE ACCESS CLEARANCES
Blower Access Panel Side .................... 30" (762mm)
Evaporator/Electrical Access Panel Side ....... 30" (762mm)
OPERATIONAL CLEARANCES
Combustible Base
(Wood or Class A, B or C
roof covering material) ..................... 0"
Supply and Return Air Ducts ............................ 0"
Duct Connection Side
........................................ 0 sl
Clearance between Overhang
and Top of Unit ................ 48" (1219mm)
Clearance around Condenser Coil area to wall or shrubs . 10"
FIGURE i Minimum Clearances and Access Panels
Overhang
Evaporator 48" MinimumOverhangClearance
AccessPanel
10" around
fcondenser
coilarea
BlowedElectrical
AccessPanel
CoverPlate
NOTE:
The unit must be installed with a slope no greater than 1/8"
per foot (10mm per meter). For side to side leveling, the con-
densate drain side side MUST always be lower.
The unit MUST be situated in such a way as to provide safe
access for servicing.
The platform may be made of either concrete or pressure
treated wood and MUST be level and strong enough to
support the unit's weight.
Position platform separate from the building's foundation.
install in a well-drained area, with the top surface of the
platform above grade level and above the average winter
snow levels to prevent coil blockage.
Platform MUST be high enough to allow for proper
condensate drainage.
Installing Duct Collars
Duct collars are supplied with the unit but are not factory installed
The collars are shipped under the blower motor. See Figure 2.
1.Remove the collars from under the blower motor.
2.Position flange holes with existing screw holes on side
wrapper.
3.Install screw in each collar so it goes through both of the
holes in the collar and wrapper.
FIGURE2I Duct Collar Installation
Control Box
Collars
Installed Indoor Fan Assy.
Collars Shipped with Unit
4 426 01 1101 00
Condensate Drain
The condensate drain outlet is a 3/4" (19.1 mm) threaded female
PVC connection located at the bottom of the unit to the left of the
evaporator access panel.
The circulating blower and the condenser fan create a negative
pressure on the condensate drain line that wil! prevent the
condensate from draining properly without a trap. To combat this
negative pressure, a field supplied condensate trap that will allow
a standing column of water of at least 2" (50.8mm) MUST be
installed. The outlet of the trap must be at least 1" below the unit
drain connection. Install the trap as near to the unit as possible
for proper drainage.
A 3/4" (19.1 mm) drain line MUST be installed if required by local
codes or if location of unit requires it. Run the drain line to an open
drain or other suitable disposal point as designated by local code.
FIGURE 3 Condensate Drain Information*
3/4" (19,1mm)
Threaded Female
PVC Fitting
1,, I
(25.4mm) 3/4" (19,1mm)
Drain Line
*Condensate trap MUST be installed.
5. Unit Electrical Wiring
ELECTRICAL SHOCK HAZARD.
Failure to follow this warning could result in personal
injury, and/or death.
Turn off electric power supply at disconnect switch or
service panel before removing any access or service
panel from unit.
Unit MUST be grounded to electrical service panel.
NOTE: All electrical work MUST conform with the requirements of
local codes and ordinances and in the United States with National
Electrical Code ANSI/NFPA 70-1990 (orcurrent edition). Provide
line voltage power supply from a separate fused circuit with a
disconnect switch (when required) located within sight of the unit.
Supply voltage, amperage, fuse and disconnect switch sizes
MUST conform with local codes and ordinances.
Wiring MUST be protected from possible mechanical damage
and MUST NOT interfere with removal of access panels, filters,
etc.
All exposed line voltage connections MUST be made through
liquid tight conduit to prevent water from entering the unit through
the electrical access..
Ground Connections
A ground lug is installed on the control plate (or electric heat
mounting plate) for the ground connection. Use a copper
conductor of the appropriate size (as designated by local code)
from the unit to a grounded connection in the electrical service
panel or to a properly driven and electrically grounded ground rod.
See warning on this page.
Line Voltage Wiring
Do NOT complete line voltage connections until unit is
permanently grounded. All line voltage connections and the
ground connection MUST be made with copper wire.
Connections for line voltage are made on the unit electrical
control plate. For access, remove the Blower/Electrical access
pane!.
Refer to applicable wiring diagram in this Manual. Complete the
line service connections to the contactor 'L' terminals on the
electrical control plate. Check all screw terminals to ensure they
are tight.
NOTE: All openings must be sealed to prevent moisture from
entering the control box.
Electric Heat
A variety of accessory electric heaters ranging from 5.0 to 20.0
KW provide heat in the unit when required. Each package has a
heater module that mounts on the blower inlet; mounting this
module requires removal of the blower assembly and attachment
of the module to the blower standoffs provided. Each package
also includes an associated remote mounted heater control
package. Integral harnesses provided with both the heater
module and control package allow connection of the two
components via in-line plugs. Heaters are available both with and
without circuit breakers.
See installation instructions provided with the electric heater for
specific installation and application details.
426 01 1101 00 5
Converting 230V Units to 208V
To convert 230V units to 208V:
1.Turn electric power OFE
2.Remove the blower/electrical access panel.
3.Locate the 24V control transformer.
4.Remove wire from the terminal labeled "240V" on the 24V
control transformer and reconnect it to the 208V terminal of
the 24V control transformer.
&Replace the electrical/compressor access panel.
Low Voltage Wiring
For access, remove the electrical control/blower access panel.
Refer to the connection wiring diagram for the applicable model
and to the instructions included with the thermostat.
Route low voltage wires through the port located on the rear panel
and up to the control box.
Thermostat Connections
The location of the thermostat has an important effect on the
operation of the unit. See the thermostat instructions for proper
connection. See FIGURE 4 for Low Voltage Wire Harness
Connections
Field Installed Equipment
Wiring to be done in the field between the unit and other devices,
or between separate devices which are field installed and located,
MUST NOT exceed the temperature limitations for type T wire
and MUST be installed in accordance with manufacturer's
instruction and applicable local codes.
Final Electrical Check
Make a final wiring check to be sure system is correctly wired.
Inspect field installed wiring and the routing to ensure that rubbing
or chafing due to vibration will not occur.
NOTE: Wiring MUST be installed so it is protected from possible
mechanical damage.
GuRE4 I Electr°nic Therm°stat L°w V°ltage wiring
NarnessConnectionD agram
PAM324-42 Units
©
@
Gt
Thermostat and subbase
._ BRN
PAM348-54 Units
C>-
@
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Thermostat and subbase
Unit Control Power
Unit Control Power
6 426 01 1101 O0
FIGURE5 I ControlBoxConfiguration
Transforme
/
/
Indoor
Motor
Board
Capacitor
Strap
Condenser Fan/
Compressor
Capacitor
/
\Contactor
Control Box
POWER
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_IF] _EI_IL 'A"
_rROST TIWERTO BE SE_AT_o wiwuT_s
SINGLECAPACITYCONTROLBOX - 208/230/1
POWZR
PIGIAILS
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PIGIAILS
b_JI
0
Control Box Wiring for PAM048-54
_olo_
II .......
DUAL CAPACITY CONTROL BOX 208/23D11
(D_}_llpOSTION_
42601 1101 O0 7
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42601 1101 O0 9
6. Rain Shield Installation
FIGURE 6 [Installing The Rain Shield
RAIN SHIELD
requirements. If the unit is connected to an existing system, the
ductwork MUST be checked to make sure it is adequate. Extra
runs or larger duct sizes may have to be installed.
Maximum recommended velocity in trunk ducts is 1000 feet per
minute (5.08m/s). Velocity in branches should not exceed 800
feet per minute (4.06m/s). Refer to the Technical Data Label on
the unit for unit air volume requirements and system sizing
recommendations.
NOTE: Ductwork sizing affects temperature rise and cooling
temperature differential. Be sure to properly size ductwork to the
capacity and airflow characteristics of your unit. Failure to do so
can affect limit controls, compressors, motors, and other
components and will lead to premature failure of components.
This will also adversely affect day to day unit performance.
Flexible Duct Kits are available from your supplier to effect proper
sizing and installation to Mobile Homes and other standard
construction,.
Refer to unit rating plate for proper Electric Heat Accessory sizing
and see the Temperature Rise Check section in the Electric Heat
Accessory Installation manual.
1. Remove all screws from the cover plate on Blower/Electrical Access
Panel.
2.Install adhesive backed gasket on Blower/Electrical Access
Panel.
3.Install lower frame of rain shield with 4 screws.
4.Install rain shield hinged cover with 4 screws.
5.Install circuit breaker filler plates (2 each per unused breaker
slot.)
&Re-install Blower/Electrical Access Panel.
NOTE: VERIFY ALL APPROPRIATE SEALS ARE IN PLACE.
SEE FIGURE 6.
7. Air Distribution System
For airflow data (blower performance data, blower speed tap
settings, etc.) see the Technical Data Sheet attached to the unit.
Duetwork
NOTE: The total heat gain of the structure to be conditioned as
expressed in total Btu/hr should be calculated by manufacturer's
method or in accordance with "A.S.H.R.A.E. Guide" or "Manual J
Load Calculations" published by the Air Conditioning
Contractors of America. The total heat gain calculated should be
equal to or less than the cooling capacity output based on D.O.E.
test procedures, steady state efficiency times input.
Ductwork, supply registers, and return air grilles MUST be
designed and sized to handle the unit's cooling air volume
Ductwork Insulation
It is recommended that ductwork installed outdoors have a
minimum of 2" (51 mm) of fiberglass insulation and be covered by
a weatherproof vapor barrier that is protected against damage.
Caulking and flashings, or other means adequate to provide a
permanent weather seal, must be used.
It is recommended that ductwork installed in attics or other areas
exposed to outdoor temperatures have a minimum of 2" (51mm)
fiberglass insulation and have an indoor type vapor barrier.
Ductwork Connections
The use of flexible, non-combustible connectors between main
trunk ducts and supply and return air plenums is recommended to
minimize vibration transmission.
NOTE: Connect supply and return air plenums to unit in a manner
that will allow the top of the unit to be removed without removing
plenums. Plenums MUST be individually sealed to unit casing.
Ducts MUST be terminated inside structure.
Filters
All return air MUST pass through a field supplied filter before
entering the unit. if used, an electronic air cleaner MUST be
installed in the return air ductwork. Minimum recommended filter
areas are listed in FIGURE 7 and are based on a velocity of 300
ff./min. (1.2m/s) for disposable filters and 500 ft./min. (2.54m/s)
for washable high velocity filters.
NOTE:
Do NOT operate the unit without all filters in place.
FIGURE 7 Recommended Filter Sizes
NOTE: Some filters are marked with an arrow to indicate the proper direction of air flow through the filter. The air flow direction wilI be towards
the blower motor. Make sure filter is installed correctly.
Nominal Tons
Air Conditioning
2
2 1/2
3
3 1/2
4
5
Nominal Air Flow
Cubic Feet
per Minute
700-900
875 - 1125
1050 -1350
1225 -1575
1400-1800
1750 - 2000
10
Recommended Filter Sizes
Sq. In. Surface Area/Nominal Size
Disposable Filters
400 or 20 x 25
487 or 20 x 30
576 or 14 x 25 (2Req.)
865 or 16 x 25 (2Req.)
753 or 20 x 25 (2 Req.)
960 or 20 x 30 (2 Req.)
Gleanable Filters
246 or 15 x 20
301 or 14x25
356 or 16x25
411 or 20 x25
486 or 20 x 25
575 or 24 x 25
42601 1101 00
8. Start-up Procedures
ELECTRICAL SHOCK HAZARD.
Failure to follow this warning could result in personal
injury, and/or death.
Use extreme care during all of the following checks
and procedures.
Make sure electric power i8 turned OFF as instructed
in appropriate steps.
Circulating Air Blower
Determining Blower Speed
1.Turn electric power OFF.
2. From the system design, determine the total external static
pressure (ESP) for the supply ducts, return ducts and
registers, diffusers, grilles, dampers, heaters and filters.
3.To your system ESP determined in Step 2, add 0.05 In. W.C.
for a wet coil.
4.From the system design, determine the desired cooling
airflow in cubic feet per minute (CFM).
5.Locate the unit's Blower Performance Data table in Figure 8.
From the table, determine the speed tap required to achieve
the desired airflow.
6.See next section, Speed Taps, to set the blower motor speed
terminal block (speed taps) to the cooling speed determined
in the previous steps.
Speed Taps
After determining the required CFM and speed tap data from the
Figure 8, follow the steps below to change speeds if necessary.
FIGURE 8 Blower Speed Tap Settings and Blower Performance Data
Blower Speed Tap Settings
Rated Airflow High Airflow
2TON Tap 1 Tap 2
21/2 TON Tap 2 Tap 3
3 TON Tap 1 Tap 2
31/2 TON Tap 3 Tap 4
4TON Tap 3 (Hi); 1 (Lo) Tap 4 (Hi); 2 (Lo)
5TON Tap 3 (Hi); 1 (Lo) Tap 4 (Hi); 2 (Lo)
See Figure 5 for Blower
Speed Tap Pigtail
BLOWER PERFORMANCE DATA
Model Number PHM324K00A1 PHM330K00A1 PHM336K00A1 PHM342K00A1 PHM348K00A1 PHM354K00A1
Speed Tap 1 2 3 4 1 2 3 41 2 3 4 1 2 3 4123 412 34
0.1 1078 1170 1170 1266 1420 1497 1559 1694 1213 1299 1698 1974 1389 1461 205C 2179
0.2 833 1102 1102 1221 1288 1433 1520 1657 1028 1226 1652 1924 1292 1417 2003 2132
Air Delivery in 0.3 783 1052 1052 1184 1209 1387 1480 1620 909 1157 1601 1859 1228 1364 1963 2093
CFM@Varying 0.4 720 1006 - 1006 1152 1170 1334 1438 1583 825 1094 1542 1813 159 1296 1923 2049
0.5 681 964 964 1121 1153 1294 1401 1550 762 1037 1494 1761 104 1243 1874 2011
External Static 0.6 615 921 921 1089 1106 1292 1359 1514 667 961 1442 1706 1043 1180 1823 1968
Pressure (in, 0.7 489 881 881 1047 1065 1247 1318 1474 613 915 1390 1651 988 1129 1783 1921
w.c.) 0.8 435 838 838 1017 1011 1203 1268 1437 841 1324 1602 940 1083 1734 1877
0.9 378 789 789 985 967 1171 1218 1389 769 1265 1538 873 1026 168C 1830
1 317 684 684 951 910 1117 1181 719 1201 1485 828 978 162,2 1760
Notes: Air Delivery @ listed external static pressre are taken at 230Volts with Dry coit, no filter and approved heater
For wet coil add .05 in. wc to Static Pressure measurement Note for 208 Votts appIications, reduce airflow by 15%
NOTE: On Heat Pumps Electric heater blower wire must be
attached to the same speed tap required for cooling/heat pump
operation. The yellow lead MUST always be connected to the
speed tap block at the common quick connect terminal. The
terminal is identified as COM.
Refer to Figures 5 and 8 and the appropriate unit wiring diagram
included in this manual. Wire the black wire to the required speed
tap terminal to achieve required airflow determined in Step 5.
HEATING SPEED, If auxiliary electric heat is installed, the
auxiliary electric heat blower speed wire must be connected to the
black wire insulated quick connect terminal.
Check Before Starting
1. Check that the blower motor speed terminal block is set to
the proper cooling speed. Refer to the unit wiring diagram
and the various airflow tables in this manual.
Cooling, Heating (Heat Pump) and Auxiliary
Electric Strip Heat
2. Check to see that clean, properly sized field supplied air
filters are installed in the return air duct.
NOTE: The cooling, heat pump and strip heat airflows are all on
the same speed tap. The refrigerant system requires the same
specific CFM for proper operation in the cooling and the heat
pump mode. For this reason, cooling and heating airflow must be
the same. DO NOT SPLIT OUT INTO A COOLING SPEED AND
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3. Inspect the inside of the unit to be sure that all wires are in
place and all tools, etc. are removed.
4. Replace all service access panels.
Check the unit's operation as outlined in the following
instructions. If any unusual sparking, odors or noises are
11
encountered, shut OFF electric power immediately. Recheck for
wiring errors, or obstructions in or near blower motors.
Circulating Air Blower
1.Be sure electric power is OFE
2.Set thermostat Heat-Cool selector to OFE
3.Set thermostat fan switch to AUTO
4.Turn electric power ON. Nothing should start running.
5.Set thermostat fan switch to ON. The circulating air blower
should come ON.
6.Reset thermostat fan switch to AUTO. The circulating air
blower should go OFF after a 60 second delay for models
PAM324-42 and 90 second delay for PAM348-54. Nothing
should be running.
Cooling
1. Be sure that electric power is OFF.
2. Set thermostat Heat-Cool select to COOL.
3. Adjust thermostat setting to below room temperature.
4. Turn electric power ON. During power application check the
following:
a. Contactor - Contacts closing
b. Compressor - ON
c. Condenser fan motor - ON
d. Circulating air blower - ON (after delay)
5.Switch the thermostat to OFF, check the following:
a. Contactor contacts opening.
b. Compressor - OFF
c. Condenser fan motor - OFF
d. Circulating blower - OFF (after delay)
6.Turn electric power OFF
9. Sequence of Operation
Cooling Operation (PAM324-42)
(1)On a call for cooling (Y)
The indoor fan energizes immediately whereas the contactor
energizes after a 5 minute time delay (in case of an initial
start up) starting the compressor and the outdoor fan motor.
(2)When the cooling eetpoint has been satisfied
When the cooling demand is met, (Y) de-energizes, shutting
off the compressor, indoor fan and the outdoor fan.
Cooling Operation (PAM348-54)
(1)On a call for cooling
These units utilize a 2 stage indoor thermostat. With a first
stage call for cooling (Y1), the indoor fan (low stage)
energizes immediately whereas the contactor energizes after
a 5 minute time delay (incase of an initial start up) starting the
compressor (low stage) and the outdoor fan motor. If the low
stage operation cannot satisfy the cooling demand, the
second stage cooling (Y2) energizes switching the
compressor into high stage cooling through energizing an
internal solenoid valve inside the scroll compressor and
switching the indoor fan into high stage.
(2)When the cooling setpoint has been satisfied
When second stage cooling is satisfied, Y2 de-energizes
switching the compressor and the indoor fan into low stage
cooling. When the low stage cooling demand is met, Y1
de-energizes shutting off the compressor, indoor fan and the
outdoor fan.
Heating Operation (PAM324-42)
(1) On a call for heating ......... :
With a call for heating (W2), the auxiliary or electric heat
energizes along with the Indoor blower. Incase of staged
heating, W3 is energized if the demand is not met. The
highest airflow selected is run while the electric heat is in
operation.
(2) When the heating setpoint has been satisfied
When heating demand is met, W3 and W2 sequentially
de-energize shutting off the indoor fan and the electric
heater.
Heating Operation (PAM348-54)
(1) On a call for heating ......... :
With a call for heating (W2), the auxiliary electric heater is
energized along with the Indoor blower. If the demand is not
met, W3 is energized incase of staged heating.
(2) When the heating eetpoint has been satisfied
When heating demand is satisfied, W3 and W2
sequentially de-energize along with the indoor fan blower.
Continuoue Fan
With the continuous Indoor fan option selected on the thermostat,
G is continuously energized. Incase of 024 - 042 units, the
selected airflow setting is provided. In the case of 048 and 054
units, the system runs low stage (Y1) airflow for continuous fan
operation.
Low/High Preesure Controls
This unit is equipped with extra low and high pressure ports
located inside the unit panel where the external high and low
pressure ports are installed. This allows for installation of high
and low pressure controls or low ambient controls.
10. Operation
Scroll Recycle Delay Timer
The defrost board isequipped with a recycle delay timer which will
delay the start of the compressor for 5 minutes in the event of a
power interruption. This sequences power throughout the
system and prevents possible reverse rotation of the scroll
compressor. The output of the timer controls the compressor
contactor via a normally open contact of K3 (T2). The timer starts
the delay cycle when the compressor is turned off by removal of
"Y." If application of "Y" occurs before the timer has expired, the
compressor contactor wil! not be energized until the timer has
expired.
REDUCED EQUIPMENT LIFE HAZARD
Failure to follow this caution may result in premature
component failure.
Do NOT operate unit on cooling when the outdoor
temperature is below 45°F or PAM324 and 40°F for
PAM330-54. This is necessary to prevent possible
damage to the compressor.
Pressure Switch
Loss of Charge Pressure Switch: Units are equipped with a low
pressure switch on the liquid line (high side) which has been
installed to prevent system damage due to a loss of charge. The
switch will open and de-energize the contactor if the high side
pressure drops below the set point of the switch.
High Pressure Switch: The PAM348-54 are equipped with a high
pressure switch to protect the compressor.
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