Installation and servicing of air-conditioning equipment can be
hazardous due to system pressure and electrical components.
Only trained and qualified service personnel should install, repair,
or service air-conditioning equipment.
Untrained personnel can perform basic maintenance functions of
cleaning coils and filters and replacing filters. All other operations
should be performed by trained service personnel. When working
on air-conditioning equipment, observe precautions in the
literature, tags and labels attached to the unit, and other safety
precautions that may apply.
Follow all safety codes. Wear safety glasses and work gloves. Use
quenching cloth for unbrazing operations. Have fire extinguishers
available for all brazing operations.
Recognize safety information. This is the safety--alert symbol
.When you see this symbol on the furnace and in
instructions or manuals, be alert to the potential for personal
injury.
Understand the 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 a hazard
which could result in personal injury or death. CAUTION is used
to identify unsafe practices which ma y 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.
!
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could cause personal
injury or death.
Before performing service or maintenance operations
on unit, turn off main power switch to unit and install
lockout tag. Ensure electrical service to rooftop unit
agrees with voltage and amperage listed on the unit
rating plate.
WARNING
INSTALLATION
Unit is shipped in the vertical discharge configuration. To convert
to horizontal discharge application, remove duct opening covers.
Using the same screws, install covers on duct openings in
basepan of unit with insulation-side down. Seals around
openings must be tight. (See Fig. 1.)
1
Page 2
Step 1 —Provide Unit Support
Curb
Roof
Assemble and install accessory roof curb in accordance with
instructions shipped with curb. (See Fig. 2.) Install insulation,
cant strips, roofing felt, and counter flashing as shown. Ductworkmust be attached to curb, not to the unit. If electric control power
or gas service is to be routed through the basepan, attach the
accessory thru-the-bottom service connections to the basepan in
accordancewiththeaccessoryinstallationinstructions.
Connections must be installed before unit is set on roof curb.
50HE,HJ
Fig. 1 --- Horizontal Conversion Panels
IMPORTANT: The gasketing of the unit to the roof curb is critical
for a watertight seal. Install gasket supplied with the roof curb as
shown in Fig. 2. Improperly applied gasket can resul t in air leaks and
poor unit performance.
Curb should be level. Unit leveling tolerances are shown in Fig.
3. This is necessary for unit drain to function properly.Refer to
Accessory Roof Curb Installation Instructions for additional
information as required.
Slab Mount (Horizontal Units Only)
Provide a level concrete slab that extends a minimum of 6 in.
beyond unit cabinet. Install a gravel apron in front of
condenser-coil air inlet to prevent grass and foliage from
obstructing airflow.
C06108
NOTE: Horizontal units may be installed on a roof curb if
required.
Alternate Unit
Support
When the curb or adapter cannot be used, support unit with
sleeper rails using unit curb or adapter support area. If sleeper
rails cannot be used, support the long sides of the unit with a
minimum of 3 equally spaced 4-in. x 4-in. pads on each side.
Step 2 —Field Fabricate Ductwork
Secure all ducts to roof curb and building structure on vertical
discharge units. Do not connect ductwork to unit. For horizontal
applications, field-supplied isolation flanges should be attached to
horizontal discharge openings and all ductwork should be secured
to the flanges. Insulate and weatherproof all external ductwork,
joints, and roof openings with counter flashing and mastic in
accordance with applicable codes.
Ducts passing through an unconditioned space must be insulated
and covered with a vapor barrier.
If a plenum return is used on a vertical unit, the return should be
ducted through the roof deck to comply with applicable fire
codes.
A minimum clearance is not required around ductwork. Cabinet
return-air static pressure (a negative condition) shall not exceed
0.35 in. wg with economizer or 0.45 in. wg without economizer.
Step 3 —Install External Trap for
Condensate Drain
Condensate drain connections are located on the bottom and side
of the unit. Unit discharge connections do not determine the use
of drain connections; either drain connection can be used with
vertical or horizontal applications.
When using the standard side drain connection, ensure the plug
(Red) in the alternate bottom connection is tight before installing
the unit.
To use the bottom drain connection for a roof curb installation,
relocate the factory-installed plug (Red) from the bottom
connection to the side connection. The center drain plug looks
like a star connection, however it can be removed with a
1
/2-in.
socket drive extension. (See Fig. 4.) The piping for the
condensate drain and external trap can be completed after the unit
is in place.
All units must have an external trap for condensate drainage.
Install a trap 4-in. deep and protect against freeze-up. If drain line
is installed downstream from the external trap, pitch the line away
from the unit at 1 in. per 10 ft of run. Do not use a pipe size
smaller than the unit connection (
3
/4in.). (See Fig. 5.)
2
Page 3
1-4
[406]
DALT
DRAIN
HOLE
13/4
[44.5]
GASPOWERCONTROL
3
/4
[19] NPT
1
/2
[12.7] NPT
3
/4
[19] NPT
CONNECTOR
PKG. ACCY.
CRBTMPWR001A01
CRBTMPWR002A011
CRBTMPWR003A01
BC
11
/16
1-9
[551]
CRBTMPWR004A01
3
/4 [19] NPT
1
/4 [31.7]
3
/4 [19] NPT
1
/4 [31.7]
1
1
/2
[12.7]
ACCESSORY
POWER
1
/2
[12.7]
ROOF CURB
ACCESSORY
CRRFCURB001A01
CRRFCURB002A01
NOTES:
1. Roof curb accessory is shipped disassembled.
2. Insulated panels.
3. Dimensions in [ ] are in millimeters.
4. Roof curb: galvanized steel.
5. Attach ductwork to curb (flanges of duct rest
on curb).
6. Service clearance: 4 ft on each side.
1-2
[356]
2-0
[610]
A
UNIT
SIZE
50HJ004-007
50HE003-006
7.Direction of airflow.
8. Connector packages CRBTMPWR001A01
and 002A01 are for thru-the-curb type gas.
Packages CRBTMPWR003A01 and 004A01
are for thru-the-bottom type gas conne ctions.
50HE,HJ
Fig. 2 --- Roof Curb Details
3
C06155
Page 4
Step 4 —Rig and Place Unit
Inspect unit for transportation damage, and file any claim with
transportation agency. Keep unit upright and do not drop.
Spreader bars are not required if top crating is left on unit, and
rollers may be used to move unit across a roof. Level by using
unit frame as a reference. See Table 1, 2 and Fig. 6 for additional
information. Operating weight is shown in Table 1, 2 and Fig. 6.
Lifting holes are provided in base rails as shown in Fig. 7. Refer
to rigging instructions on unit.
!
PERSONAL INJURY AND PROPERTY DAMAGE
HAZARD
WARNING
Failure to follow this warning could result in personal
injury, death and property damage.
All panels must be in place when rigging and lifting.
50HE,HJ
Positioning
Maintain clearance around and above unit to provide minimum
distance from combustible materials, proper airflow, and service
access. (See Fig. 7, 8 and 9.)
Position unit on roof curb so that the following clearances are
maintained:
1
/4in. clearance between the roof curb and the base
rail inside the front and rear, 0.0 in. clearance between the roof
curb and the base rail inside on the duct end of the unit. This will
result in the distance between the roof curb and the base rail
inside on the condenser end of the unit being approximately
equal to Fig. 2, section C-C.
Do not install unit in an indoor location. Do not locate unit air
inlets near exhaust vents or other sources of contaminated air.
CONDENSATE PAN (SIDE VIEW)
HORIZONTAL
DRAIN OUTLET
NOTE: Drain plug is shown in factory-installed position.
DRAIN PLUG
C06003
Fig. 4 --- Condensate Drain Connection
NOTE: Trap should be deep enough to offset maximum unit static
difference. A 4-in. trap is recommended.
C06004
Fig. 5 --- Condensate Drain Piping Details
MAXIMUM ALLOWABLE
DIFFERENCE (in.)
A-BB-CA-C
0.51.01.0
Fig. 3 --- Unit Leveling Tolerances
Although unit is weatherproof, guard against water from higher
level runoff and overhangs.
After unit is in position, remove polyethylene shipping wrapper
and top crating.
C06110
4
Page 5
NOTES:
1. Place unit on curb as close as possible to the duct end.
2. Dimension in ( ) is in millimeters.
3. Hook rigging shackles through holes in base rail as shown in detail "A." Holes in base rails are centered around the unit center of gravity. Use wooden
top skid when rigging to prevent rigging straps from damaging unit.
4. Weights include base unit without economizer. See Table 1 for unit operating weights with accessory economizer.
5. Weights include base unit without the Humidi-MiZer
Humidi-MiZer system.
TM
adaptive dehumidification system. See Table 1 for unit operating weights with the
Failure to follow this warning could result in personal
injury, death and property damage.
All panels must be in place when rigging and lifting.
Fig. 7 --- Roof Curb Alignment
C06208
5
Page 6
C06156
50HE,HJ
Fig. 8 --- 50HJ004--007 Base Unit Dimensions
6
Page 7
C06157
50HE,HJ
Fig. 9 --- 50HE003--006 Base Unit Dimensions
7
Page 8
Step 5 —Make Electrical Connections
!
WARNING
ELECTRICAL SHOCK HAZARD
Failur e to follow this warning could res ul t in personal
injury or death,
Unit cabi net must have an uninterrupted, unbroke n
electrical ground to minimize the possibility of personal
injury if an electr i cal fault should occur. This ground may
consist of el ectri cal wire connected to unit ground lug in
control compa rtment, or conduit approved for electr i cal
ground when installed in accordance with NEC (National
Electrical Code), ANSI/NFPA (National Fire Protection
Association), latest edition, and local electrical codes. Do
not use gas piping as an ele ctrical ground.
Field Power Supply
All units except 208/230-v units are factory wired for the voltage
50HE,HJ
shown on the nameplate. If the 208/230-v unit is to be connected
to a 208-v power supply, the transformer must be rewired by
disconnecting the black wire from the 230-v 1/4--in. terminal on
the transformer and connecting it to the 200-v 1/4--in. terminal
from the transformer.
Refer to unit label diagram for additional information. Pigtails
are provided for field service. Use factory-supplied splices or UL
(Underwriters’ Laboratories) approved copper connector.
When installing units, provide a disconnect per NEC.
Allfield wiringmustcomplywithNECand local
requirements.
Install field wiring as follows:
1. Install conduit through side panel openings. For units
without electric heat, install conduit between disconnect
and control box.
2. Install power lines to terminal connections as shown in
Fig. 12.
3. For units with electric heat, refer to Accessory Electric
Heat Installation Instructions.
During operation, voltage to compressor terminals must bewithin
range indicated on unit nameplate (also see Table 3 and 4). On
3--phase units, voltages between phases must be balanced within
2% and the current within 10%. Use the formula shown in Table
3 and 4, Note 2, to determine the percentage of voltage
imbalance. Operation on improper line voltage or excessive phase
imbalance constitutes abuse and may cause damage to electrical
components. Such operation invalidates any applicable Carrier
warranty.
NOTE: If accessory thru-the-bottom connections and roof curb
are used, refer to the Thru-the-Bottom Accessory Installation
Instructions for information on wiring the unit.
Field Control W
iring
Install a Carrier-approved accessory thermostat assembly
according to installation instructions included with the accessory.
Locate thermostat assembly on a solid wall in the conditioned
space to sense average temperature in accordance with thermostat
installation instructions.
Route thermostat cable or equivalent single leads of colored wire
from subbase terminals through connector on unit to low-voltage
connections (shown in Fig. 10 and 11).
NOTE: For wire runs up to 50 ft, use no. 18 AWG (American
Wire Gauge) insulated wire (35_Cminimum).For50to75ft,use
no. 16 AWG insulated wire (35_C minimum). For over 75 ft, use
no. 14 AWG insulated wire (35_C minimum). All wire larger
than no. 18 AWG cannot be directly connected to the thermostat
and will require a junction box and splice at the thermostat.
1. Connect thermostat wires to screw terminals of lowvoltage
terminal board.
2. Pass the control wires through the hole provided in the
control box.
3. Some models may be equipped with a raceway built into
the corner post on the left side of control box (See Fig.
13.) This raceway provides the required clearance between
high--voltage and low voltage wiring. For models without
a raceway, ensure to provide the NEC required clearance
between high--voltage and low--voltage wiring.
Heat Anticipator
Settings
Set heat anticipator settings at 0.8 amp for first stage and 0.3 for
second stage heating.
W1
W2
IPD/X
R
G
Y1
Y2
C
WIRE
CONNECTIONS
TO
LOW-VOLTAGE
SECTION
C06008
COOL STAGE 1
FAN
HEAT STAGE 1
COOL STAGE 2
HEAT STAGE 2
24 VAC HOT
24 VAC COM
N/A
OUTDOOR AIR
SENSOR
THERMOSTATDIPSWITCH SETTINGS
ON
OFF
A
LEGEND
NOTE: Under lined letter indicates active thermostat output when
configured for A/C operation.
B
C
Field Wiring
Y1/W2
G
W/W1
Y/Y2
O/W2
R
C
S1
S2
D
Fig. 10 --- Low--Voltage connections With or
Without Economizer or Two--Position Damper
CONTROL
CONNECTION
BOARD
24 VAC
R
RMTOCC
G
CMPSAFE
Y2
FSD
W1
SFS
NOT USED
C
C
X
X
THERMOSTAT CONTROL
CONNECTION
BOARD
R
Y1
Y2
W1
W2
G
C
R
Y1
Y2
W1
W2
G
C
X
C06009
Fig. 11 --- Low--Voltage Connections
(Units with PremierLinkt Controls)
8
Page 9
Table 1—Physical Data 50HJ
BASE UNIT 50HJ004005006007
NOMINAL CAPACITY
OPERATING WEIGHT (lb)
Unit
Humidi-MiZer Adaptive Dehumidification System
EconoMi$er IV
Roof Cur b
COMPRESSOR
Quantity
Oil (oz)
REFRIGERANT TYPE
Expansion Device
Operating Charge (lb-oz)
Standard Unit
Unit With Humidi-Mizer Adaptive Dehu midification System
CONDENSER FAN
Quantity...Diameter (in.)
Nominal C f m
Motor Hp...Rpm
Watts Input (Total)
CONDENSER COIL
Rows...Fins/in.
Tot a l Face Area (s q ft )
EVAPORATOR COIL
Standard Unit
Rows...Fins/in.
Tot a l Face Area (s q ft )
Unit with Humidi-Mizer Adaptive Dehu midification System
Rows...Fins/in.
Tot a l Face Area (s q ft )
EVAPORATOR FAN
Quantity...Size (in.)
Nominal C f m
Maximum Continuous BhpStd
Hi-Static
Motor Frame SizeStd
Hi-Static
Fan Rpm RangeStd
Hi-Static
Motor Bearing Type
Maximum Fan Rpm
Motor Pulley Pitch Diameter A/B (in.)
Hi-Static
Nominal Motor Shaft Diameter (in.)Std
Hi-Static
Fan Pulley Pitch D iameter (in.)Std
Hi-Static
Belt — Type...Length (in.)Std
Hi-Static
Pulley Center Line Distance (in.)
Speed Change per Full Turn of
Movable Pulley Flange (rpm)
Movable Pulley Maximum Full
Turns from Closed Position
Hi-Static
Hi-Static
Factory Setting — Full Turns OpenStd
Hi-Static
Factory Speed Setting (rpm)Std
Hi-Static
Fan Shaft Diameter at Pulley (in.)
HIGH-PRESSURE SWITCH (psig)
Standard Compressor Internal Relief
Cutout
Reset (Auto.)
HACR --- Heating, Air Conditioning an d Refrigeration
IFM --- Indoor (Evaporator) Fan Motor
LRA --- Locked Rotor Amps
MCA --- Mini mum Ci rcuit Am ps
MOCP --- Maxi mum Ov ercurrent Protectio n
NEC --- National Electrical Code
OFM --- Outdoor (Condenser) Fan Motor
RLA --- Rated Load Amps
* The values listed in this table do not include power exhaust. See power exhaust table for power exhaust requirements.
** Fuse or HACR breaker
FLA ---Full Load Amps
(tons)
{ Heater capacity (kW) is based on h eater voltage of 240v, 480v or 575v. If power distribution voltage to un it varies from rated heater voltage, h eater kW will v ary acc ordingly
HACR --- Heating, Air Conditioning an d Refrigeration
IFM --- Indoor (Evaporator) Fan Motor
LRA --- Locked Rotor Amps
MCA --- Mini mum Ci rcuit Am ps
MOCP --- Maxi mum Ov ercurrent Protectio n
NEC --- National Electrical Code
OFM --- Outdoor (Condenser) Fan Motor
RLA --- Rated Load Amps
* The values listed in this table do not include power exhaust. See power exhaust table for power exhaust requirements.
** Fuse or HACR breaker
FLA ---Full Load Amps
{ Heater capacity (kW) is based on h eater voltage of 240v, 480v or 575v. If power distribution voltage to un it varies from rated heater voltage, h eater kW will v ary acc ordingly
NOTES:
28
Page 29
Step 6 —Adjust Factory-Installed Options
Energy Recovery Units
Cobra
Please refer to the supplement provided for information on
installing and operating the factory optional COBRA Energy
Recovery Units. These units are equipped with a factory--installed
energy recovery unit and have different installation and operation
procedures than the standard unit.
Humidi--Mizer
Adaptive Dehumidification
System
Humidi--MiZer system operation can be controlled by field
installation of a Carrier--approved humidistat. (See Fig. 14.)
NOTE: A light commercial Thermidistat device (Fig. 15) can
be used instead of the humidistat if desired. The Thermidistat
device includes a thermostat and a humidistat. The humidistat is
normally used in applications where a temperature sensor is
already provided (units with PremierLink control).
% RELATIVE HUMIDITY
C06126
Fig. 14 --- Accessory Field--Installed Humidistat
C06127
Fig. 15 --- Light Commercial thermidistat Device
To install the humidistat:
1. Route humidistat cable through hole provided in unit
control box.
2. Some models may be equipped with a raceway built into
the corner post on the left side of control box (See Fig.
13.) This raceway provides the required clearance between
high--voltage and low voltage wiring. For models without
a raceway, ensure to provide the NEC required clearance
between high--voltage and low--voltage wiring.
3. Use a wire nut to connect humidistat cable into lowvoltage wiring as shown in Fig. 16.
To install Thermidistat device:
1. Route Thermidistat cable through hole provided in unit
control box.
2. Some models may be equipped with a raceway built into
the corner post on the left side of control box (See Fig.
13.) This raceway provides the required clearance between
high--voltage and low voltage wiring. For models without
a raceway, ensure to provide the NEC required clearance
between high--voltage and low--voltage wiring.
3. A field-supplied relay must be installed between the
thermidistat and the Humidi-Mizer circuit (recommended
relay: HN612KK324). (See Fig. 17.) The relay coil is
connected between the DEHUM output and C (common)
of the unit. The relay controls the Humidi-MiZer solenoid
valve and must be wired between the Humidi-MiZer fuse
and the low-pressure switch. Refer to the installation
instructions included with the Carrier Light Commercial
Thermidistat device for more information.
Disconnect
Switch
The optional disconnect switch is non --fused. The switch has the
capability of being locked in place for safety purposes.
Manual Outdoor
Damper
The outdoor--air hood and screen are attached to the basepan at
the bottom of the unit for shipping.
Assembly:
1. Determine quantity of ventilation required for building.
Record amount for use in Step 8.
2. Remove and save outdoor air opening panel and screws.
(See Fig. 18.)
3. Remove evaporator coil access panel. Separate hood and
screen from basepan by removing the 4 screws securing
them. Save all screws.
4. Replace evaporator coil access panel.
5. Place hood on front of outdoor air opening panel. See
Fig. 19 for hood details. Secure top of hood with the
4screwsremovedinStep3.(SeeFig.20.)
6. Remove and save 6 screws (3 on each side) from sides of
the manual outdoor-air damper.
7. Align screw holes on hood with screw holes on side of
manual outdoor-air damper. (See Fig. 19 and 20.) Secure
hood with 6 screws from Step 6.
8. Adjust minimum position setting of the damper blade by
adjusting the manual outdoor-air adjustment screws on the
front of the damper blade. (See Fig. 18.) Slide blade
vertically until it is in the appropriate position determined
by Fig. 21. Tighten screws.
9. Remove and save screws currently on sides of hood.
Insert screen. Secure screen to hood using the screws. (See
Fig. 20.)
Convenience
Outlet
An optional convenience outlet provides power for rooftop use.
For maintenance personnel safety, the convenience outlet power
is off when the unit disconnect is off. Adjacent unit outlets may
be used for service tools.
Novar Contr
ols
Optional Novar controls (ETM 3051) are available for
replacement or new construction jobs.
Fig. 16 --- Typical Humidi--MiZert Adaptive Dehumidification System
Humidistat Wiring (208/230--V Unit Shown)
LCT
R
C
Y1
Y2
G
W1
W2
DEHUM
OC
TSTAT WIRES
LEGEND
CB— Circuit Breaker
LCT — Light Commercial Thermidistat™ Device
LLSV — Liquid Line Solenoid Valve
LTLO — Low Temperature Lockout
Fig. 17 --- Typical Rooftop Unit with Humidi--Mizer
Adaptive Dehumidification System with Thermidistat Device
OUTDOOR
AIR OPENING
PANEL
3 SCREWS
(SIDE)
R1
R1
ROOF TOP UNIT
R
C
Y1
Y2
G
W1
W2
PINK
PINK
CB
3.2 AMPS
LTLO
HUMIDI-MIZER SYSTEM
RED
PINK
24 V
FROM
HUMIDI-MIZER SYSTEM
LLSV
C06129
Fig. 18 --- Damper Panel with Manual Outdoor--Air
Damper Installed
C06130
C06013
Fig. 19 --- Outdoor--Air Hood Details
30
Page 31
C06131
Fig. 20 --- Outdoor-- Air Damper With
Hood Attached
C06132
Fig. 21 --- Outdoor-- Air Damper Position Setting
Premierlink
Control
The PremierLink controller is compatible with Carrier Comfort
NetworkR (CCN) devices. This control is designed to allow
users the access and ability to change factory--defined settings,
thus expanding the function of the standard unit control board.
Carrier’s diagnostic standard tier display tools such as
Navigatort or Scrolling Marquee can be used with the
PremierLink controller.
The PremierLink controller (see Fig. 22 and 23) requires the use
of a Carrier electronic thermostat or a CCN connection for time
broadcast to initiate its internal timeclock. This is necessary for
broadcast of time of day functions (occupied/unoccupied). No
sensors are supplied with the field--mounted PremierLink control.
The factory--installed PremierLink control includes only the
supply-- air temperature (SAT) sensor and the outdoor air
temperature (OAT) sensor as standard. An indoor air quality
(CO2) sensor can be added as an option. Refer to Table 5 for
sensor usage. Refer to Fig. 24 for PremierLink controller wiring.
The PremierLink control may be mounted in the control panel or
an area below the control panel.
NOTE: PremierLink controller versions 1.3 and later are shipped
in Sensor mode. If used with a thermostat, the PremierLink
controller must be configured to Thermostat mode.
Install the Supply Air Temperature (SAT) Sensor
When the unit is supplied with a factory--mounted PremierLink
control,thesupply--airtemperature(SAT)sensor
(33ZCSENSAT) is factory--supplied and wired. The wiring is
routed from the PremierLink control over the control box,
through a grommet, into the fan section, down along the back
side of the fan, and along the fan deck over to the supply--air
opening.
The SAT probe is wire--tied to the supply--air opening (on the
horizontal opening end) in its shipping position. Remove the
sensor for installation. Re--position the sensor in the flange of the
supply-- air opening or in the supply air duct (as required by local
codes). Drill or punch a 1/2-- in. hole in the flange or duct. Use
two field--supplied, self--drilling screws to secure the sensor probe
in a horizontal orientation.
NOTE: The sensor must be mounted in the discharge airstream
downstream of the cooling coil and any heating devices. Be sure
the probe tip does not come in contact with any of the unit or heat
surfaces.
Outdoor Air T emperature Sensor (OAT)
When the unit is supplied with a factory-mounted PremierLink
control,theoutdoor-airtemperature sensor(OAT)is
factory-supplied and wired.
Install the Indoor Air Quality (CO
Mount the optional indoor air quality (CO
)Sensor
2
) sensor according to
2
manufacturer specifications.
A separate field-supplied transformer must be used to power the
sensor.
CO
2
Wire the CO
sensor to the COM and IAQI terminals of J5 on the
2
PremierLink controller. Refer to the PremierLink Installation,
Start-up, and Configuration Instructions for detailed wiring and
configuration information.
Enthalpy Sensors and Control
The enthalpy control (HH57AC077) is supplied as a
field-installed accessory to be used with the EconoMi$er2
damper control option. The outdoor air enthalpy sensor is part of
the enthalpy control. The separate field-installed accessory return
air enthalpy sensor (HH57AC078) is required for differential
enthalpy control.
NOTE: The enthalpy control must be set to the “D” setting for
differential enthalpy control to work properly.
The enthalpycontrol receives theindoor and return
enthalpy from the outdoor and return air enthalpy sensors and
provides a dry contact switch input to the PremierLink controller.
Locate the controller in place of an existing economizer controller
or near the actuator. The mounting plate may not be needed if
existing bracket is used.
A closed contact indicates that outside air is preferred to the
return air. An open contact indicates that the economizer should
remain at minimum position.
Outdoor Air Enthalphy Sensor/Enthalpy Controller
(HH57AC077)
T o wire the outdoor air enthal py sensor, perform the following (See
Fig. 25 and 26):
NOTE: The outdoor air sensor can be removed from the back of
the enthalpy controller and mounted remotely.
50HE,HJ
31
Page 32
Table 5—PremierLink Sensor Usage
APPLICATION
OUTDOOR AIR
TEMPERATURE SENSOR
RETURN AIR
TEMPERATURE SENSOR
OUTDOOR AIR
ENTHALPY SENSOR
Dry Bulb
Tem p e r a tu r e w i t h
PremierLink*
(PremierLink
I n c l u d e d ---
CRTEMPSN001A00
—
requires 4-20 mA
Actuator)
Differential Dry Bulb
Tem p e r a tu r e w i t h
PremierLink*
(PremierLink
requires 4-20 mA
I n c l u d e d ---
CRTEMPSN001A00
R e q u i r e d ---
33ZCT55SPT
or Equivalent
Actuator)
Single Enthalpy with
PremierLink*
(PremierLink
requires 4-20 mA
Actuator)
I n c l u d e d ---
Not Used
—
R e q u i r e d ---
HH57AC077
or Equivalent
Differential Enthalpy
50HE,HJ
with PremierLink*
(PremierLink
requires 4-20 mA
I n c l u d e d ---
Not Used
—
Actuator)
*PremierLink control requires Supply Air Temperature sensor 33ZCSENSAT and Outdoor Air Temperature sensor C RTEMPSN001A00
— Included with factory-installed PremierLink control; field-supplied and field-installed with field-installed PremierLink control.
NOTES:
1. CO
Sensors (Optional):
2
33ZCSENCO2 — Room sensor (adjustable). Aspirator box is required for duct mounting of the sensor.
33ZCASPCO2 — Aspirator box used for duct-mounted CO
33ZCT55CO2 — Space temperature and CO
33ZCT56CO2 — Space temperature and CO
2. All units include the following Standard Sensors:
Outdoor-Air Sensor — 50HJ 540569 — Opens at 67_F, c l o s e s a t 5 2 _F, not adjustable.
Mixed-Air Sensor — HH97AZ001 — (PremierLink control requires Supply Air Temperature sensor 33ZCSENSAT
and Outdoor Air Temperature Sensor CRTEMPSN001A00)
Compressor Lockout Sensor — 50HJ540570 — Opens at 35_F, c l o s e s a t 5 0 _F.
room sensor with override.
2
room sensor with override and set point.
2
room sensor.
2
R e q u i r e d --HH57AC077
or Equivalent
RETURN AIR
ENTHALPY SENSOR
——
——
—
R e q u i r e d --HH57AC078
or Equivalent
Fig. 22 --- PremierLink Controller
32
C06016
Page 33
PREMIERLINK
CONTROL
HINGED
DOOR
PANEL
50HE,HJ
C06017
Fig. 23 --- PremierLinktController (Installed)
OAT
PNK
VIO
YEL
BLU
BLK
RED
BLU
YEL
WHT
7
6
11
10
8
2
3
4
1
5
9
12
TR
SR
2
OUTDOOR AIR
ENTHALPY SENSOR
Economi$er2
4 - 20mA
RED
BRN
PNK
7
VIO
6
11
10
8
2
3
4
Power Exhaust/Energy Recycler
1
GRA
5
ORN
9
PNK
12
TR1
+
3
GRAY
RED
SAT
Space Temp./ Set
Point Adjustment
Indoor Air
Quality Sensor
Outdoor Air
Quality Sensor
GRAY
BLK
S
RETURN AIR
ENTHALPY
SENSOR
BLK
RED
RMTOCC
CMPSAFE
FSD
SFS
CCN
Com
+
m.
TB-2
1
2
3
4
5
6
7
8
TB-3
1
2
3
4
5
6
7
8
BLU
BRN
BLK
BRN
RED
BRN
BLU
ORN
GRN
YEL
BLU
WHT
PNK
RED
WHT
BLK
VIO
BRN
BRN
ORN
RED
BLU
LEGEND
GRA
PNK
BRN
BRN
GRN
YEL
BLU
WHT
PNK
BLK
BLU
GRA
GRA
PNK
BLK
ANAL OG
0-20mAIN
DISCRETE
PWR
BRN
J6
J5
J4
J1
COMMS — Communications
OAT— Outdoor Air Temperature Sensor
PWR— Power
RTU— Rooftop Unit
SAT— Supply Air Temperature Sensor
TB— Terminal Block
Fig. 24 --- Typical PremierLink Control Wiring
J2
COMMS
RED
BRN
J9
0-20 mA
TB-1
1
2
3
W1
4
5
W2
6
7
8
RTU Terminal
Board
HK50AA0
39
PremierLink
J7
PP/MP
WHT
R
RED
Y1
GRA
Y2
ORN
ORN
PNK
G
WHT
C
X
GRA
Relays
J8
PNK
ORNORN
ORN
RED
C06018
33
Page 34
1. Use a 4-conductor, 18 or 20 AWG cable to connect the
A
enthalpy control to the PremierLink controller and
power transformer.
2. Connect the following 4 wires from the wire harness
BRACKET
HH57AC077
ENTHALPY
CONTROL AND
OUTDOOR AIR
ENTHALPY SENSOR
located in rooftop unit to the enthalpy controller:
a. Connect the BRN wire to the 24 vac terminal (TR1) on
enthalpy control and to pin 1 on 12-pin harness.
b. Connect the RED wire to the 24 vac GND terminal (TR)
on enthalpy sensor and to pin 4 on 12-pin harness.
c. Connect the GRAY/ORN wire to J4-2 on PremierLink
controller and to terminal (3) on enthalpy sensor.
d. Connect the GRAY/RED wire to J4-1 on PremierLink
HH57AC078 ENTHALPY
SENSOR (USED WITH
ENTHALPY CONTROL
FOR DIFFERENTIAL
ENTHALPY OPERATION)
C7400A1004
+
controller and to terminal (2) on enthalpy sensor.
NOTE: If installing in a Carrier rooftop, use the two gray wires
provided from the control section to the economizer to connect
PremierLinkcontrollertoterminals2and3onenthalpysensor.
MOUNTING PLATE
Return Air Enthalphy Sensor
Mount the return-air enthalpy sensor (HH57AC078) in the
50HE,HJ
return-air duct. The return air sensor is wired to the enthalpy
controller (HH57AC077). The outdoor enthalpy changeover set
point is set at the controller.
ENTHALPY CONTROLLER
B
TRTR1
C
A
D
SO
SR
2
LED
NOTES:
1. Remove factory-installed jumper across SR and + before connecting
wires from return air sensor.
2. Switches shown in high outdoor air enthalpy state. Terminals 2 and 3
close on low outdoor air enthalpy relative to indoor air enthalpy.
3. Remove sensor mounted on back of control and locate in outside airstream.
RED
BRN
BLK
+
+
3
1
RED
GRAY/ORN
GRAY/RED
WIRE HARNESS
IN UNIT
(OUTDOOR
S
AIR
+
ENTHALPY
SENSOR)
S
(RETURN AIR
ENTHALPY
+
SENSOR)
C06019
Fig. 25 --- Outdoor and Return Air Sensor Wiring
Connections for Differential Enthalpy Control
To wire the return air enthalpy sensor, perform the following (See
Fig. 25):
1. Use a 2--conductor, 18 or 20 AWG, twisted pair cable to
connect the return air enthalpy sensor to the enthalpy
controller.
2. At the enthalpy control remove the factory-installed
resistor from the (SR) and (+) terminals.
3. Connect the field-supplied RED wire to (+) spade
connector on the return air enthalpy sensor and the (SR+)
terminal on the enthalpy controller. Connect the BLK wire
to (S) spade connector on the return air enthalpysensor
and the (SR) terminal on the enthalpy controller.
Fig. 26 --- Differential Enthalpy Control,
Sensor and Mounting Plate (33AMKITENT006)
ECONOMI$ER IV
CONTROLLER
WIRING
HARNESS
CTUATOR
OUTSIDE AIR
TEMPERATURE SENSOR
LOW AMBIENT
SENSOR
Fig. 27 --- EconoMi$er IV Component Locations
ECONOMI$ER2
PLUG
OUTDOOR
AIR HOOD
HOOD
SHIPPING
BRACKET
C06020
C06021
BAROMETRIC
RELIEF
DAMPER
GEAR DRIVEN
DAMPER
C06022
Fig. 28 --- EconoMi$er2 Component Locations
Optional Economi$er IV and
Economi$er2
See Fig. 27 for EconoMi$er IV component locations. See Fig. 28 for
EconoMi$e r2 component locati ons.
34
Page 35
NOTE:These instructions are for installing the optional
EconoMi$er IV and EconoMi$er2 only. Refer to the accessory
EconoMi$er IV or EconoMi$er2 installation instructions when
field installing an EconoMi$er IV or EconoMi$er2 accessory.
1. To remove the existing unit filter access panel, raise the
panel and swing the bottom outward. The panel is now
disengaged from the track and can be removed. (See
Fig. 29.)
2. The box with the economizer hood components is shipped
in the compartment behind the economizer. The
EconoMi$er IV controller is mounted on top of the
EconoMi$er IV in the position shown in Fig. 24. The
optional EconoMi$er2 with 4 to 20 mA actuator signal
control does not include the EconoMi$er IV controller. To
remove the component box from its shipping position,
remove the screw holding the hood box bracket to the top
of the economizer. Slide the hood box out of the unit. (See
Fig. 30.)
IMPORTANT: If the power exhaust accessory is to be installed
on the unit, the hood shipped with the unit will not be used and
must be discarded. Save the aluminum filter for use in the power
exhaust hood assembly.
3. The indoor coil access panel will be used as the top of the
hood. Remove the screws along the sides and bottom of
the indoor coil access panel. (See Fig. 31.)
4. Swing out indoor coil access panel and insert the hood
sides under the panel (hood top). Use the screws provided
to attach the hood sides to the hood top. Use screws
provided to attach the hood sides to the unit. (See Fig. 32.)
5. Remove the shipping tape holding the economizer
barometric relief damper in place.
6. Insert the hood divider between the hood sides. (See
Fig. 32 and 33.) Secure hood divider with 2 screws on
each hood side. The hood divider is also used as the
bottom filter rack for the aluminum filter.
7. Open the filter clips which are located underneath the
hood top. Insert the aluminum filter into the bottom filter
rack (hood divider). Push the filter into position past the
open filter clips. Close the filter clips to lock the filter into
place. (See Fig. 33.)
8. Caulk the ends of the joint between the unit top panel and
the hood top. (See Fig. 31.)
9. Replace the filter access panel.
10. Install all EconoMi$er IV accessories. EconoMi$er IV
wiring is shown in Fig. 34. EconoMi$er2 wiring is shown
in Fig. 35.
Barometric flow capacity is shown in Fig. 36. Outdoor air
leakage is shown in Fig. 37. Return air pressure drop is shown in
Fig. 38.
FILTER ACCESS PANEL
x
o
B
d
o
o
H
Fig. 30 --- Hood Box Removal
SIDE
PANEL
CAULK
INDOOR
COIL
ACCESS
PANEL
HERE
Fig. 31 --- Indoor Coil Access Panel Relocation
INDOOR COIL
ACCESS PANEL
LEFT
HOOD
SIDE
B
19 1/16”
SCREW
33 3/8”
HOOD BOX
BRACKET
TOP
SIDE
PANEL
INDOOR
COIL
ACCESS
PANEL
TOP
PANEL
C06024
50HE,HJ
C06025
COMPRESSOR
ACCESS PANEL
OUTDOOR-AIR OPENING AND
INDOOR COIL ACCESS PANEL
Fig. 29 --- Typical Access Panel Locations
C06023
HOOD DIVIDER
Fig. 32 --- Outdoor-- Air Hood Construction
Economi$er IV Standard
Sensors
Outdoor Air T emperature (OAT) Sensor
The outdoor air temperature sensor (HH57AC074) is a 10 to 20 mA
device used to measure the outdoor-air tempera t ure. The outdoor-air
tempe rature is used to dete rmine when the EconoMi $er IV can be
used for free cooling. The sens or is fact or y-installed on the
EconoMi$e r IV in the outdoor airst ream. (See Fig. 27.) The
operating range of temperature measurement is 40_ to 100_F.
35
C06026
Page 36
Supply Air Temperature (SAT) Sensor
R
The supply air temperature sensor is a 3 K thermistor located at
the inlet of the indoor fan. (See Fig. 39.) This sensor is factory
installed. The operating range of temperature measurement is 0
to 158_F. See Table 6 for sensor temperature/resistance values.
Table 6—Supply Air Sensor Temperature/
Resistance Values
Economi$er IV Control
IMPORTANT: The optional EconoMi $er2 does not include a
controller. The EconoMi$er2 is operated by a 4 to 20 mA
from an existing field-supplied controller (such as PremierLink
control ). See Fig. 35 for wiring informa tion.
Determine the EconoMi$er IV control mode before set up of the
control. Some modes of operation may require different
sensors. Refer to Table 7. The EconoMi$er IV is supplied from
Modes
signal
the factory with a supply-- air temperature sensor and an outdoor--
air temperature sensor. This allows for operation of the
EconoMi$er IV with outdoor air dry bulb changeover control.
Additional accessories can be added to allow for different types of
changeover control and operation of the EconoMi$er IV and unit.
Table7—Economi$erIVSensorUsage
APPLICATION
Outdoor Air
Dry Bulb
Differential
Dry Bulb
Single EnthalpyHH57AC078
Differential
Enthalpy
CO2for DCV
Control using a
Wall-Mounted
Sensor
CO
2
CO2for DCV
Control using a
Duct-Mounted
Sensor
CO
2
*CRENTDIF004A00 a nd CRTEMPSN002A00 accessories are used on many
different base units. As such, these kits may contain parts that will not be
needed for installation.
† 33ZCSENCO2 is an accessory CO
** 33ZCASPCO2 is an accessory aspirator box required for duct-mounted
applications.
†† CRCBDIOX005A00 is an accessory that contains both 33ZCSENCO2
and 33ZCASPCO2 accessories.
ECONOMI$ER IV WITH OUTDOOR AIR
33ZCSENCO2†
33ZCASPCO2**
DRY BULB SENSOR
Accessories Required
None. The outdoor air dry bulb sensor
is factory installed.
CRTEMPSN002A00*
HH57AC078
and
CRENTDIF004A00*
33ZCSENCO2
O
and
sensor.
2
CRCBDIOX005A00††
R
Outdoor Dry Bulb Changeover
The standard controller is shipped from the factory configured for
DIVIDER
OUTSIDE
AIR
HOOD
CLEANABLE
BAROMETRIC
RELIEF
ALUMINUM
FILTER
FILTER
FILTE
CLIP
C06027
Fig. 33 --- Filter Installation
The temperature sensor looks like an eyelet terminal with wires
running to it. The sensor is located in the “crimp end” and is
sealed from moisture.
Outdoor Air Lockout Sensor
The Economi$er IV is equipped with an ambient temperature
lockout switch located in the outdoor air stream which is used to
lockout the compressors below a 42_F ambient temperature. (See
Fig. 27.)
outdoor dry bulb changeover control. The outdoor--air and
supply-- air temperature sensors are included as standard. For this
control mode, the outdoor temperature is compared to an
adjustable set point selected on the control. If the outdoor-air
temperature is above the set point, the EconoMi$er IV will adjust
the outdoor-air dampers to minimum position. If the outdoor air
temperature is below the set point, the position of the outdoor air
dampers will be controlled to provide free cooling using outdoor
air. When in this mode, the LED next to the free cooling set point
potentiometer will be on. The changeover temperature set point is
controlled by the free cooling set point potentiometer located on
the control. (See Fig. 40.) The scale on the potentiometer is A, B,
C, and D. See Fig. 41 for the corresponding temperature
changeover values.
Differential Dry Bulb Control
For differential dry bulb control the standard outdoor dry bulb
sensor is used in conjunction with an additional accessory dry
bulb sensor (part number CRTEMPSN002A00). The accessory
sensor must be mounted in the return airstream. (See Fig. 42.)
Wiring is provided in the EconoMi$er IV wiring harness. (See
Fig. 33.)
In this mode of operation, the outdoor-air temperature is
compared to the return-air temperature and the lower temperature
airstream is used for cooling. When using this mode of
changeover control, turn the enthalpy setpoint potentiometer fully
clockwise to the D setting. (See Fig. 40.)
36
Page 37
DCV— Demand Controlled Ventilation
p
IAQ — Indoor Air Quality
LA — Low Ambient Lockout Device
OAT — Outdoor-Air Temperature
POT— Potentiometer
RAT— Return-Air Temperature
LEGEND
FOR OCCUPANCY CONTROL
REPLACE JUMPER WITH
FIELD-SUPPLIED TIME CLOCK
1. 620 ohm, 1 watt 5% resistor should be removed only when using differential
enthalpy or dry bulb.
2. If a separate field-supplied 24 v transformer is used for the IAQ sensor power
supply, it cannot have the secondary of the transformer grounded.
3. For field-installed remote minimum position POT, remove black wire jumper
between P and P1 and set control minimum position POT to the minimum
osition.
50HE,HJ
C06028
BLACK
4
3
5
BLUE
500 OHM
RESISTOR
VIOLET
NOTE 1
PINK
RUN
OUTPUT
-
+
2
YELLOW
WHITE
NOTE 3
50HJ540573
ACTUATOR
ASSEMBLY
DIRECT DRIVE
ACTUATOR
NOTES:
1. Switch on actuator must be in run position for economizer to operate.
2. PremierLink™ control requires that the standard 50HJ540569 outside-air sensor be replaced by either the CROASENR001A00 dry bulb sensor or HH57A077
enthalpy sensor.
3. 50HJ540573 actuator consists of the 50HJ540567 actuator and a harness with 500-ohm resistor.
OPTIONAL CO
SENSOR4-20mA
2
8
6
7
RED
1
10
11
9
12
ECONOMISER2 PLUG
Fig. 35 --- EconoMi$er2 with 4 to 20 mA Control Wiring
C06029
Outdoor Enthalpy Changeover
For enthalpy control, accessory enthalpy sensor (part number
HH57AC078) is required. Replace the standard outdoor dry bulb
temperature sensor with the accessory enthalpy sensor in the same
mounting location. (See Fig. 27.) When the outdoor air enthalpy
rises above the outdoor enthalpy changeover set point, the
outdoor-air damper moves to its minimum position. The outdoor
enthalpy changeover set point is set with the outdoor enthalpy set
point potentiometer on the EconoMi$er IV controller. The set
points are A, B, C, and D. (See Fig. 43.) The factory-installed
620-ohm jumper must be in place across terminals SR and SR+
on the EconoMi$er IV controller. (See Fig. 27 and 44.)
37
Page 38
Differential Enthalphy Control
For differential enthalpy control, the EconoMi$er IV controller
usestwoenthalpysensors(HH57AC078and
CRENTDIF004A00), one in the outside air and one in the return
air duct. The EconoMi$er IV controller compares the outdoor
air enthalpy to the return air enthalpy to determine EconoMi$er
IV use. The controller selects the lower enthalpy air (return or
outdoor) for cooling. For example, when the outdoor air has a
lower enthalpy than the return air, the EconoMi$er IV opens to
bring in outdoor air for free cooling.
2500
2000
SUPPLY AIR
TEMPERATURE
SENSOR
MOUNTING
LOCATION
SUPPLY AIR
TEMPERATURE
SENSOR
1500
1000
500
FLOW IN CUBIC FEET PER MINUTE (cfm)
0
0.05
STATIC PRESSURE (in. wg)
0.15
0.25
C06030
50HE,HJ
Fig. 39 --- Supply Air Sensor Location
C06033
Fig. 36 --- Barometric Flow Capacity
30
25
20
15
10
5
0
0.13 0.20 0. 22 0.25 0.30 0.35 0.40 0.45 0.5 0
FLOW IN CUBIC FEET PER MINUTE (cfm)
STATIC PRESSURE (in. wg)
Fig. 37 --- Outdoor-- Air Damper Leakage
C06031
Fig. 40 --- EconoMi$er IV Controller Potentiometer
and LED Locations
Replace the standard outside air d ry bulb temperature sensor with
the accessory enthalpy sensor in the same mounting location.
(See Fig. 27.) Mount the return air enthalpy sensor in the return
air duct. (See Fig. 42.) Wiring is provided in the EconoMi$er IV
C06034
wiring harness. (See Fig. 34.) The outdoor enthalpy changeover
6000
5000
4000
3000
2000
1000
0
0.050.100.150. 200.250.300. 35
FLOW IN CUBIC FEET PER MINUTE (cfm)
STATIC PRESSURE (in. wg)
Fig. 38 --- Return--Air Pressure Drop
C06032
set point is set with the outdoor enthalpy set point potentiometer
on the EconoMi$er IV controller. When using this mode of
changeover control, turn the enthalpy setpoint potentiometer fully
clockwise to the D setting.
Indoor Air Quality (IAQ) Sensor Input
The IAQ input can be used for demand control ventilation control
based on the level of CO
measured in the space or return air
2
duct.
Mount the accessory IAQ sensor according to manufacturer
specifications. The IAQ sensor should be wired to the AQ and
AQ1 terminals of the controller. Adjust the DCV potentiometers
to correspond to the DCV voltage output of the indoor air quality
sensor at the user-determined set point. (See Fig. 45.)
If a separate field-supplied transformer is used to power the IAQ
sensor, the sensor must not be grounded or the EconoMi$er IV
control board will be damaged.
Exhaust Set Point Adjustment
The exhaust set point will determine when the exhaust fan runs
based on damper position (if accessory power exhaust is
installed). The set point is modified with the Exhaust Fan Set
Point (EXH SET) potentiometer. (See Fig. 40.) The set point
represents the damper position above which the exhaust fans will
be turned on. When there is a call for exhaust, the EconoMi$er IV
controller provides a 45 15 second delay before exhaust fan
38
Page 39
activation to allow the dampers to open. This delay allows the
damper to reach the appropriate position to avoid unnecessary fan
overload.
Minimum Position Control
There is a minimum damper position potentiometer on the
EconoMi$er IV controller. (See Fig. 40.) The minimum damper
position maintains the minimum airflow into the building during
the occupied period.
When using demand ventilation, the minimum damper position
represents the minimum ventilation position for VOC (volatile
organic compound) ventilation requirements. The maximum
demand ventilation position is used for fully occupied ventilation.
When demand ventilation control is not being used, the minimum
position potentiometer should be used to set the occupied
ventilation position. The maximum demand ventilation position
should be turned fully clockwise.
Adjust the minimum position potentiometer to allow the
minimum amount of outdoor air, as required by local codes, to
enter the building. Make minimum position adjustments with at
least 10_F temperature difference between the outdoor and
return-air temperatures.
To determine the minimum position setting, perform the
following procedure:
1. Calculate the appropriate mixed air temperature using the
following formula:
OA
(T
Ox
100100
+(TR
)
RA
x
)=T
M
Thermostats
The EconoMi$er IV control works with conventional thermostats
that have a Y1 (cool stage 1), Y2 (cool stage 2), W1 (heat stage
1), W2 (heat stage 2), and G (fan). The EconoMi$er IV control
does not support space temperature sensors. Connections are
made at the thermostat terminal connection board located in the
main control box.
19
LED ON
mA
14
18
17
16
15
13
12
11
10
9
40
LED OFF
45
D
50
60
55
DEGREES FAHRENHEIT
LED ON
C
LED OFF
65
70
LED ON
LED OFF
75
B
LED ON
A
LED OFF
100
90
95
85
80
C06035
Fig. 41 --- Outside Air Temperature
Changeover Set Points
ECONOMI$ER IV
CONTROLLER
ECONOMI$ER IV
50HE,HJ
TO= Outdoor-Air Temperature
OA = Percent of Outdoor Air
= Return-Air Tem perature
T
R
RA = Percent of Return Air
= Mixed-Air Temperature
T
M
As an example, if local codes require 10% outdoor air during
occupied conditions, outdoor-air temperature is 60_F, a n d
return-air temperature is 75_F.
(60 x .10) + (75 x .90) = 73.5_F
2. Disconnect the supply air sensor from terminals T and T1.
3. Ensure that the factory-installed jumper is in place across
terminals P and P1. If remote damper positioning is being
used, make sure that the terminals are wired according to
Fig. 34 and that the minimum position potentiometer is
turned fully clockwise.
4. Connect 24 vac across terminals TR and TR1.
5. Carefully adjust the minimum position potentiometer
until the measured supply air temperature matches the
calculated value.
6. Reconnect the mixed air sensor to terminals T and T1.
Remote control of the EconoMi$er IV damper is desirable when
requiringadditionaltemporaryventilation.Ifa
field-supplied remote potentiometer (Honeywell part number
S963B1128) is wired to the EconoMi$er IV controller, the
minimum position of the damper can be controlled from a remote
location.
To control the minimum damper position remotely, remove the
factory-installed jumper on the P and P1 terminals on the
EconoMi$er IV controller. Wire the field-supplied potentiometer
to the P and P1 terminals on the EconoMi$er IV controller. (See
Fig. 44.)
Damper Mo vement
Damper movement from full open to full closed (or vice versa)
1
/2minutes.
takes 2
GROMMET
RETURN AIR
SENSOR
RETURN DUCT
(FIELD-PROVIDED)
C06036
Fig. 42 --- Return Air T emperature or Enthalpy
Sensor Mounting Location
Occupancy Control
The factory default configuration for the EconoMi$er IV control
is occupied mode. Occupied mode is provided by the black
jumper from terminal TR to terminal N. When unoccupied mode
is desired, install a field-supplied timeclock function in place of
the jumper between TR and N. (See Fig. 34.) When the timeclock
contacts are closed, the EconoMi$er IV control will be in
occupied mode. When the timeclock contacts are open (removing
the 24-v signal from terminal N), the EconoMi$er IV will be in
unoccupied mode.
39
Page 40
85
(29)90(32)95(35)
46
65
(18)
4
4
42
40
70
(21)
0
0
1
80
(27)
75
(24)
0
9
80
70
0
6
50
0
4
CONTROL
50HE,HJ
2
1
CURVE
A
B
C
D
1
4
1
CONTROL POINT
APPROX.
2
8
1
6
deg. F (deg. C)
AT 50% RH
73 (23)
70 (21)
67 (19)
63 (17)
4
3
32
30
28
ENTHALPY BTU PER POUND DRY AIR
26
4
2
2
2
0
55
(13)
50
C
(10)
45
D
(7)
40
(4)
35
(2)
3
(16)
B
8
3
6
60
A
100
105
(38)
RELATIVE HUMIDITY (%)
30
20
110
(41)
(43)
0
1
35
40
45
50
55
60
(2)
(4)
(10)
(7)
APPROXIMATE DRY BULB TEMPERATURE--degrees F (degrees C)
(13)
(16)
(18)
65
Fig. 43 --- Enthalpy Changeover Set Points
Demand Controlled Ventilation (DCV)
When using the EconoMi$er IV for demand controlled
ventilation, there are some equipment selection criteria which
should be considered. When selecting the heat capacity and cool
capacity of the equipment, the maximum ventilation rate must be
evaluated for design conditions. The maximum damper position
must be calculated to provide the desired fresh air.
Typically the maximum ventilation rate will be about 5 to 10%
more than the typical cfm required per person, using normal
outside air design criteria.
A proportional anticipatory strategy should be taken with the
following conditions: a zone with a large area, varied occupancy,
and equipment that cannot exceed the required ventilation rate at
design conditions. Exceeding the required ventilation rate means
the equipment can condition air at a maximum ventilation rate
that is greater than the required ventilation rate for maximum
occupancy. A proportional-anticipatory strategy will cause the
fresh air supplied to increase as the room CO
even though the CO
the CO
level reaches the set point, the damper will be at
2
set point has not been reached. By the time
2
level increases
2
maximum ventilation and should maintain the set point.
In order to have the CO
sensor control the economizer damper in
2
this manner, first determine the damper voltage output for
minimum or base ventilation. Base ventilation is the ventilation
required to remove contaminants during unoccupied periods. The
following equation may be used to determine the percent of
outside-air entering the building for a given damper position. For
best results there should be at least a 10 degree difference in
outside and return-air temperatures.
(21)
A
B
C
D
105
70
75
80
(24)
(27)
85
(29)90(32)95(35)
OA
(T
Ox
100100
+(TR
)
100
(38)
(41)
110
(43)
RA
x
)=T
HIGH LIMIT
CURVE
M
C06037
TO= Outdoor-Air Temperature
OA = Percent of Outdoor Air
= Return-Air Tem perature
T
R
RA = Percent of Return Air
= Mixed-Air Temperature
T
M
Once base ventilation has been determined, set the minimum
damper position potentiometer to the correct position.
The same equation can be used to determine the occupied or
maximum ventilation rate to the building. For example, an output
of 3.6 volts to the actuator provides a base ventilation rate of 5%
and an output of 6.7 volts provides the maximum ventilation rate
of 20% (or base plus 15 cfm per person). Use Fig. 42 to
determine the maximum setting of the CO
sensor. For example,
2
a 1100 ppm set point relates to a 15 cfm per person design. Use
the 1100 ppm curve on Fig. 45 to find the point when the CO
2
sensor output will be 6.7 volts. Line up the point on the graph
with the left side of the chart to determine that the range
configuration for the CO
EconoMi$er IV controller will output the 6.7 volts from the CO
sensor should be 1800 ppm. The
2
2
sensor to the actuator when the CO2concentration in the space is
at 1100 ppm. The DCV set point may be left at 2 volts since the
sensor voltage will be ignored by the EconoMi$er IV
CO
2
controller until it rises above the 3.6 volt setting of the minimum
position potentiometer.
Once the fully occupied damper position has been determined, set
the maximum damper demand control ventilation potentiometer
to this position. Do not set to the maximum position as this can
result in over-ventilation to the space and potential high-humidity
levels.
40
Page 41
N1
P1
T1
AQ1
SO+
SR+
EXH
2V10V
EXH
Open
2V10V
DCV
2V10V
Free
Cool
B
A
DCV
DCV
C
D
Set
Min
Pos
Max
Set
N
P
T
AQ
SO
SR
TR1
TR
24
24 Vac
Vac
COM
HOT
_
+
12
3
EF1
EF
5
4
C06038
Fig. 44 --- EconoMi$er IV Control
CO SENSOR MAX RANGE SETTING
6000
5000
4000
3000
2000
1000
RANGE CONFIGURATION (ppm)
0
2
800 ppm
900 ppm
1000 ppm
1100 ppm
2345678
DAMPER VOLTAGE FOR MAX VENTILATION RATE
C06039
Fig. 45 --- CO2Sensor Maximum Range Setting
Sensor Configuration
CO
2
The CO
sensor has preset standard voltage settings that can be
2
selected anytime after the sensor is powered up. (See Table 8.)
Use setting 1 or 2 for Carrier equipment. (See Table 8.)
1. Press Clear and Mode buttons. Hold at least 5 seconds
until the sensor enters the Edit mode.
2. Press Mode twice. The STDSET Menu will appear.
3. Use the Up/Down button to select the preset number. (See
Tab l e 8 . )
4. Press Enter to lock in the selection.
5. Press Mode to exit and resume normal operation.
The custom settings of the CO
sensor can be changed anytime
2
after the sensor is energized. Follow the steps below to change the
non-standard settings:
1. Press Clear and Mode buttons. Hold at least 5 seconds
until the sensor enters the Edit mode.
2. Press Mode twice. The STDSET Menu will appear.
3. Use the Up/Down button to toggle to the NONSTD menu
and press Enter.
4. Use the Up/Down button to toggle through each of the
nine variables, starting with Altitude, until the desired
setting is reached.
5. Press Mode to move through the variables.
6. Press Enter to lock in the selection, then press Mode to
continue to the next variable.
Dehumidification of Fresh Air with DCV Control
Information from ASHRAE indicates that the largest humidity
load on any zone is the fresh air introduced. For some
applications, a device such as a 62AQ energy recovery unit is
added to reduce the moisture content of the fresh air being
brought into the building when the enthalpy is high. In most
cases, the normal heating and cooling processes are more than
adequate to remove the humidity loads for most commercial
applications.
If normal rooftop heating and cooling operation is not adequate
for the outdoor humidity level, an energy recovery unit and/or a
dehumidification option should be considered.
Step 7 —Adjust Evaporator--Fan Speed
Adjust evaporator-fan speed to meet jobsite conditions.
Tables 9 and 10 show fan rpm at motor pulley settings for the
50HE003--006 and 50HJ004-- 007 units. Tables 11 and 14 show
maximum amp draw of belt-drive motor. Table 13 shows sound
data. Refer to Tables 15-34 for performance data. See Table 35
for accessory static pressure drop. See Fig. 47 for the
Humidi-MiZer system static pressure drops.
For units with electric heating, required minimum cfm is 900 for
50HJ004; 1200 for 50HJ005; 1500 for 50HJ006 and 1800 for
50HJ007.
Belt Drive
Motors
Fan motor pulleys are factory set for speed shown in Table 1.
Check pulley alignment and belt tension prior to start-up.
To change fan speed:
1. Shut off the unit power supply and tag disconnect.
2. Loosen the belt by loosening the fan motor mounting nuts.
(See Fig. 47.)
3. Loosen movable pulley flange setscrew (See Fig. 48).
4. Screw movable flange toward fixed flange to increase
speed and away from fixed flange to decrease speed.
Increasing fan speed increases load on motor. Do not
exceed maximum speed specified in Table 1.
5. Set movable flange at nearest keyway of pulley hub and
tighten setscrew. (See T able 1 for speed change for each
full turn of pulley flange.)
6. Adjust belt tension and align fan and motor pulleys per
guidance below.
NOTE: Once the required flange position is determined for the
correct blower rpm, it is recommended (but not required) that the
variable pitch pulley be replaced with a corresponding size fixed
sheave pulley.
To align fan and motor pulleys:
1. Loosen fan pulley setscrews.
2. Slide fan pulley along fan shaft.
3. Make angular alignment by loosening motor from mounting.
To adjust belt tension:
1. Loosen fan motor mounting nuts.
2. Slide motor mounting plate away from fan scroll for
proper belt tension (
1
/2-in.deflectionwith7to10lbof
force).
3. Tighten motor mounting nuts.
4. Adjust bolt and tighten nut to secure motor in fixed
position.
50HE,HJ
41
Page 42
Table 8—CO
Sensor Standard Settings
2
SETTINGEQUIPMENTOUTPUT
1
Interface w/Standard
2
Building Control System
3
4
5
Economizer
6
7
Health & SafetyProportional—
8
Parkin g/ Air In ta kes/
9
Loading Docks
50HE,HJ
LEGEND
ppm — Parts Per Million
0.35
0.3
0.25
VENTILATION
RATE
(cfm/Person)
ProportionalAny
ProportionalAny
ExponentialAny
Proportional15
Proportional20
Exponential15
Exponential20
Proportional—
ANALOG
OUTPUT
0-10V
4-20 mA
2-10V
7-20 mA
0-10V
4-20 mA
0-10V
4-20 mA
0-10V
4-20 mA
0-10V
4-20 mA
0-10V
4-20 mA
0-10V
4-20 mA
0-10V
4-20 mA
CO
CONTROL RANGE
2
(ppm)
0-2000100050
0-2000100050
0-2000110050
0-1100110050
0- 90090050
0-1100110050
0- 90090050
0-99995000500
0-200070050
OPTIONAL
RELAY SETPOINT
(ppm)
RELAY
HYSTERESIS
(ppm)
DELTA P IN. WG
0.2
0.15
0.1
0.05
4&5ton
6 ton
3 ton
0
0
1000
2000
3000
4000
5000
6000
C06133
Fig. 46 --- Humidi--MiZert Adaptive Dehumidification System Static Pressure Drop (in. wg)
Fig. 47 --- Belt Drive Motor Mounting
C06134
C06041
Fig. 48 --- Evaporator--Fan Pulley Adjustment
42
Page 43
Table 9—50HJ and 50he Fan Rpm at Motor Pulley Setting With Standard Motor*
UNIT
50HJ
50HE
003
004
005
006
007
*Approximate fan rpm shown (standard motor/drive).
Table 11—Evaporator-Fan Motor Data — Standard Motor
UNIT
50HJ
50HE
003
004
005
006
007
UNIT
PHASE
MAXIMUM
CONTINUOUS BHP*
ALL0.585802.075.0
Single1.201000208/2304.9
Three1.201000
Single1.201000208/2304.9
Three1.201000
Single1.301650208/2309.2
Three2.402120
Three2.402120
111/
2
221/
MOTOR PULLEY TURNS OPEN
2
221/
2
331/
MOTOR PULLEY TURNS OPEN
2
331/
MAXIMUM
OPERATING WATTS*
441/
2
2
441/
2
2
551/
551/
2
6
2
6
50HE,HJ
UNIT VOLTAGE
208/2304.9
4602.2
5752.2
208/2304.9
4602.2
5752.2
208/2306.7
4603.0
5753.0
208/2306.7
4603.0
5753.0
MAXIMUM
AMP DRAW
LEGEND
Bhp — Brake Horsepower
*Extensive motor and electrical testing on these units ensures that the full horsepower and watts range of the motors can be utilized with confidence. Using the
fan motors up to the ratings shown in this table will not result in nuisance tripping or premature motor failure. Unit warranty will not be affected.
Table 12—Evaporator-Fan Motor Data — High-Static Motors
UNIT
50HJ
50HE
004
005
006
007
LEGEND
Bhp — Brake Horsepower
*Extensive motor and electrical testing on these units ensures that the full horsepower and watts range of the motors can be utilized with confidence. Using the
fan motors up to the ratings shown in this table will not result in nuisance tripping or premature motor failure. Unit warranty will not be affected.
UNIT
PHASE
MAXIMUM
CONTINUOUS BHP*
MAXIMUM
OPERATING WATTS*
Three2.402120
Three2.402120
Three2.902615
Three2.902615
UNIT VOLTAGE
208/2306.7
4603.0
5753.0
208/2306.7
4603.0
5753.0
208/2308.6
4603.9
5753.9
208/2308.6
4603.9
5753.9
MAXIMUM
AMP DRAW
43
Page 44
Table 13—Accessory/FIOP Electric Heaters Static Pressure Drop (in. wg) — 50HJ004-007 and 50HE003--006
COMPONENT
1HeaterModule0.030.05
2 Heater Modules0.140.15
60090012001400160018002000220024002600
0.070.090.090.100.110.110.120.13
0.160.160.160.170.170.170.180.18
CFM
Table 14—Accessory/FIOP EconoMi$er IV and EconoMi$er2 Static Pressure* (in. wg) — 50HJ004-007 and 50HE003 --006
COMPONENT
Vertical EconoMi$er IV and EconoMi$er20.010.020.035
Horizontal EconoMi$er IV and EconoMi$er2---------
LEGEND
FIOP --- F a c t o r y --- I n s t a l l e d O p t i o n
*The static pressure must be added to external static pressure. The sum and the indoor entering-air cfm should be used in conjunction with the Fan Performance
*Single-phase/3-phase.
NOTE: Convert watts to bhp using the following formula:
bhp =
MOTOR 50HJEFFICIENCY
003,004,005
006
007
watts input x motor efficiency
746
75
74/84*
84
GENERAL FAN PERFORMANCE NOTES
1. Values include losses for filters, unit casing, and wet coils. See Table 13 and 14 and Fig. 46 for accessory/FIOP static pressure
information.
2. Extensive motor and electrical testing on these units ensures that the full range of the motor can be utilized with confidence. Using the
fan motors up to the ratings shown will not result in nuisance tripping or premature motor failure. Unit warranty will not be affected.
See Table 11 and 12 on this page for additional information.
3. Use of a field-supplied motor may affect wire sizing. Contact your Carrier representative to verify.
4. Interpolation is permissible. Do not extrapolate.
5. Performance includes clean filter and wet coil.
Table 15—Fan Performance 50HE003 — Vertical Discharge Units; Standard Motor (Belt Drive)**
1. Bold cells indicate field-supplied drive is required.
2. Maximum continuous bhp is 2.90.
3. See general fan performance notes.
EXTERNAL STATIC PRESSURE (in. wg)
EXTERNAL STATIC PRESSURE (in. wg)
LEGEND
Bhp — Brake Horsepower
Watts — Input Watts to Motor
*Motor drive range: 1300 to 1685 rpm. All other rpms require field-supplied
drive.
50HE,HJ
57
Page 58
PRE-START-UP
!
FIRE, EXPLOSION, ELECTRICAL SHOCK HAZARD
Failur e to follow this warning could res ul t in personal
injury, death, and/or propert y damage.
1. Follow recogniz ed safe t y practices and wear protective
goggles when checking or servicing a refrige rant syste m.
2. Do not operate the compres sor or provide any electr ic
power to the unit unless the compressor termina l cover is
in place and secured.
3. Do not remove the compres sor terminal cover until all
electrical sources are disconnected and tagged with lockout
tags.
4. Relie ve all pressure from the system before touching or
disturbing anyt hi ng inside the te rminal box if a
refrigerant leak is suspected around the compre ssor
terminals. Use acceptedmethods to recover the
50HE,HJ
refrigerant.
5. Never attempt to repair a soldered connection while the
refrigerant system is under pressure.
6. Do not use a torch to rem ove any component. The
system contains oil and refr igerant under pressure. To
remove a component, wear protective goggles and proceed
as follows:
a. Shut off electrical power to the unit and tag
b. Recover refrigerant to relieve all pressure
c. Cut component connection tubing with a
d. Carefully unsweat the remaining tubing
Proceed as follows to inspect and prepare the unit for initial
start-up:
1. Remove all access panels.
2. Read and follow instructions on all WARNING,
CAUTION, and INFORMATION labels attached to, or
shipped with, unit.
3. Make the following inspections:
a. Inspect for shipping and handling damages such as
broken lines, loose parts, or disconnected wires, etc.
b. Inspectfor oil at allrefrigeranttubing connections and on
unit base. Detecting oil generally indicates a refrigerant
leak. Leak-test all refrigerant tubing connections using
electronic leak detector, halide torch, or liquid-soap
solution.
c. Inspect all field-wiring and factory-wiring connections.
Be sure that connections are completed and tight. Be sure
that wires are not in contact with refrigerant tubing or
sharp edges.
d. Inspect coil fins. If damaged during shipping and
handling, carefully straighten fins with a fin comb.
4. Verify the following conditions:
a. Make sure that condenser-fan blade are correctly
positioned in fan orifice.See Condenser-Fan Adjustment
section for more details.
b. Make sure that air filter(s) is in place.
c. Make sure that condensate drain trap is filled with water
to ensure proper drainage.
WARNING
disconnect.
from the system using both high-pressure
and low-pressure ports.
tubing cutter, and remove the component
from the unit.
stubs when necessary. Oil can ignite when
exposed to a torch flame.
d. Make sure that all tools and miscellaneous loose parts
have been removed.
START-UP
Step 1 —Unit Preparation
Make sure that the unit has been installed in accordance with
installation instructions and applicable codes.
Step 2 —Return--Air Filters
Make sure the correct filters are installed in the unit (See Table 1).
Do not operate the unit without return-air filters.
Step 3 —Outdoor--Air Inlet Screens
Outdoor-air inlet screen(s) must be in place before operating the
unit.
Step 4 —Compressor Mounting
Compressors are internally spring mounted. Do not loosen or
remove the compressor holddown bolts.
Step 5 —Internal Wiring
Check all electrical connections in unit control boxes; tighten
them as required.
Step 6 —Refrigerant Service Ports
Each unit system has 4 Schrader--type service ports: one on the
suction line, one on the liquid line, and 2 on the compressor
discharge line. Be sure that caps on the ports are tight.
Step 7 —High Flow Valves
Two high flow refrigerant valves are located on the hot gas tube
coming out of the compressor and the suction tubes. Large black
plastic caps distinguish these valves with O--rings located inside
the caps. No field access to these valves is available at this time.
Ensure the plastic caps are in place and tight or the possibility of
refrigerant leakage could occur.
Step 8 —Compressor Rotation
On 3-phase units be certain that the compressor is rotating in the
proper direction. To determine whether or not compressor is
rotating in the proper direction:
1. Connect the service gauges to suction and discharge
pressure fittings.
2. Energize the compressor.
3. The suction pressure should drop and the discharge
pressure should rise, as is normal on any start-up.
If the suction pressure does not drop and the discharge pressure
does not rise to normal levels:
1. Note that the indoor fan (006 and 007 three-phase units
only) is probably also rotating in the wrong direction.
2. Turn off power to the unit and tag disconnect.
3. Reverse any two of the unit power leads.
4. Turn on power to the unit and energize the compressor.
The suction and discharge pressure levels should now move to
their normal start-up levels.
NOTE: When the compressor is rotating in the wrong direction,
the unit makes more noise and does not provide cooling.
Step 9 —Cooling
Set the space thermostat to the OFF position. Set the system
selector switch at COOL position and the fan switch at AUTO
position. Adjust the thermostat to a setting below room
temperature. The compressor starts when contactor closes.
Check cooling effects at a setting below room temperature.
Check the unit charge. Refer to Refrigerant Charge section.
Reset the thermostat at a position above room temperature. The
compressor will shut off.
To Shut Off Unit -- Set the system selector switch at OFF
position. Resetting the thermostat at a position above room
temperature shuts off the unit temporarily until the space
temperature exceeds the thermostat setting. Units are equipped
58
Page 59
with a Cycle-LOC protection device. The unit shuts down on
any safety trip and remains off; an indicator light on the
thermostat comes on. Check the reason for the safety trip.
Compressor restart is accomplished by manual reset at the
thermostat by turning the selector switch to OFF position and
then to ON position.
Step 10 —Heating
To start unit, turn on main power supply.
Set system selector switch at HEAT position and set thermostat at
a setting above room temperature. Set fan at AUTO position.
First stage of thermostat energizes the first--stage electric heater
elements; second stage energizes second--stage electric heater
elements, if installed. Check heating effects at air supply grille(s).
If electric heaters do not energize, reset limit switch (located on
evaporator-- fan scroll) by pressing button located between
terminals on the switch.
TO SHUT OFF UNIT -- Set system selector switch at OFF
position. Resetting thermostat at a position below room
temperature temporarily shuts unit off until space temperature
falls below thermostat setting.
Step 11 —Safety Relief
A soft solder joint at the suction line fitting provides pressure
relief under abnormal temperature and pressure conditions.
Step 12 —Ventilation (Continuous Fan)
Set fan and system selector switches at ON and OFF positions,
respectively. Evaporator fan operates continuously to provide
constant air circulation.
Step 13 —Operating Sequence
Cooling -- Units Without
When thermostat calls for cooling, terminals G and Y1 are
energized. The indoor-fan contactor (IFC), reversing valve
solenoid (RVS) and compressor contactor are energized and
indoor-fan motor, compressor, and outdoor fan starts. The
outdoor fan motor runs continuously while unit is cooling.
Heating -- Units Without
When the thermostat calls for heating, terminal W1 will be
energized with 24v. The IFC and heater contactor no. 1 (HC1)
are energized.
Cooling -- Units With Economi$er
When free cooling is not available, the compressors will be
controlled by the zone thermostat. When free cooling is available,
the outdoor-air damper is modulated by the EconoMi$er IV
control to provide a 50_ to 55_F supply-air temperature into the
zone. As the supply-air temperature fluctuates above 55_ or
below 50_F, the dampers will be modulated (open or close) to
bring the supply-air temperature back within the set point limits.
Integrated EconoMi$er IV operation on single-stage units
requires a 2-stage thermostat (Y1 and Y2).
For EconoMi$er IV operation, there must be a thermostat call for
the fan (G). This will move the damper to its minimum position
during the occupied mode.
If the increase in cooling capacity causes the supply--air
temperature to drop below 45_F, then the outdoor--air damper
position will be fully closed. If the supply--air temperature
continues to fall, the outdoor-- air damper will close. Control
returns to normal once the supply--air temperature rises above
48_F.
If optional power exhaust is installed, as the outdoor--air damper
opens and closes, the power exhaust fans will be energized and
deenergized.
If field--installed accessory CO
EconoMi$er IV control, a demand controlled ventilation strategy
will begin to operate. As the CO
above the CO
will be increased proportionally. As the CO
set point, the minimum position of the damper
2
Economizer
Economizer
IV
sensors are connected to the
2
level in the zone increases
2
level decreases
2
because of the increase in fresh air, the outdoor--air damper will
be proportionally closed. Damper position will follow the higher
demand condition from DCV mode or free cooling mode.
Damper movement from full closed to full open (or vice versa)
will take between 1--1/2 and 2--1/2 minutes.
If free cooling can be used as determined from the appropriate
changeover command (switch, dry bulb, enthalpy curve,
differential dry bulb, or differential enthalpy), a call for cooling
(Y1 closes at the thermostat) will cause the control to modulate
the dampers open to maintain the supply air temperature set point
at 50_ to 55_ F.
As the supply air temperature drops below the set point range of
50_ to 55_ F, the control will modulate the outdoor--air dampers
closed to maintain the proper supply--air temperature.
Heating -- Units With Economi$er
When the room temperature calls for heat, the heating controls are
energized as described in the Heating, Units Without Economizer
section. When the thermostat is satisfied, the economizer damper
moves to the minimum position.
Cooling -- Units With Economi$er2, Premierlink
and a
Thermostat
When free cooling is not available, the compressors will be
controlled by the PremierLink control in response to the Y1 and
Y2 inputs from the thermostat.
The PremierLink control will use the following information to
determine if free cooling is available:
IV
t Control
SIndoor fan has been on for at least 30 seconds.
SThe SPT, SAT, and OAT inputs must have valid
readings.
SOAT must be less than 75_F.
SOAT must be less than SPT.
SEnthalpy must be LOW (may be jumpered if an
enthalpy sensor not available).
SEconomizer position is NOT forced.
Pre-cooling occurs when there is no call from the thermostat
except G. Pre-cooling is defined as the economizer modulates to
provide 70_F supply air.
When free cooling is available the PremierLink control will
control the compressors and economizer to provide a supply-air
temperature determined to meet the Y1 and Y2 calls from the
thermostat using the following three routines. The three control
routines are based on OAT.
The 3 routines are based on OAT where:
SASP = Supply Air Set Point
DXCTLO = Direct Expansion Cooling Lockout Set Point
PID = Proportional Integral
Routine 1 (OAT < DXCTLO)
SY1 energized – economizer maintains a SASP =
(SATLO1 + 3).
SY2 energized – economizer maintains a SASP =
(SATLO2 + 3).
Routine 2 (DXCTLO<OAT<68_F)
SIf only Y1 energized, the economizer maintains a
SASP = (SATLO1 + 3).
SIf SAT > SASP + 5 and economizer position > 80%,
economizer will go to minimum position for 3 minutes
or until SAT > 68_F.
SFirst stage of mechanical cooling will be energized.
SIntegrator resets.
SEconomizer opens again and controls to current SASP
after stage one on for 90 seconds.
59
50HE,HJ
Page 60
SWith Y1 and Y2 energized Economizer maintains an
SASP = SATLO2 + 3.
SIf SAT > SASP + 5 and economizer position >80%,
economizer will go to minimum position for 3 minutes
or until SAT > 68_F.
SIf compressor one is on then second stage of
mechanical cooling will be energized; otherwise the
first stage will be energized.
SIntegrator resets.
75
74
73
72
71
70
69
SPACE TEMPERATURE
68
TEMPERATURE CONTROL
SET POINT
TEMPERATURE
TIME
SEconomizer opens again and controls to SASP after
stage one on for 90 seconds.
Routine 3 (OAT > 68)
SEconomizer is opened 100%.
SCompressors1and2arecycledbasedonY1andY2
using minimum on and off times and watching the
supply air temperature as compared to SATLO1 and
SATLO2 set points.
50HE,HJ
If optional power exhaust is installed, as the outdoor-air damper
opens and closes, the power exhaust fans will be energized and
deenergized.
If field-installed accessory CO
sensors are connected to the
2
PremierLink control, a PID-controlled demand ventilation
strategy will begin to operate. As the CO
increases above the CO
set point, the minimum position of the
2
damper will be increased proportionally. As the CO
level in the zone
2
2
level
decreases because of the increase in fresh air, the outdoor-air
damper will be proportionally closed.
Heating -- Units With Economi$er2 Premierlink Control
a
Thermostat
and
When the thermostat calls for heating, terminal W1 is energized.
The PremierLink control will move the economizer damper to the
minimum position if there is a call for G and closed if there is a
call for W1 without G. The IFC and heater contactor no. 1 (HC1)
are energized. When the thermostat is satisfied and W1 is
deenergized, the IFM stops after a 45 --second time--off delay
unless G is still maintained.
Cooling -- Units With Economi$er2, Premierlink Control
a Room
Sensor
and
When free cooling is not available, the compressors will be
controlled by the PremierLink controller using a PID Error
reduction calculation as indicated by Fig 49.
The PremierLink controller will use the following information to
determine if free cooling is available:
SIndoor fan has been on for at least 30 seconds.
SThe SPT, SAT, and OAT inputs must have valid
readings.
SOAT must be less than 75_F.
SOAT must be less than SPT.
SEnthalpy must be LOW (may be jumpered if and
enthalpy sensor is not available).
SEconomizer position is NOT forced.
NOTE: PremierLink control performs smart staging of 2 stages of DX
cooling and up to 3 stages of heat.
C06042
Fig. 49 --- DX Cooling Temperature
Control Example
TEMPERATURE CONTROL
75
74
73
72
71
70
69
SPACE TEMPERATURE
68
TIME
COOL SETPOINT
TEMPERATURE
HEAT SETPOINT
C06043
Fig. 50 --- Economizer T emperature
Control Example
When free cooling is available, the outdoor-air damper is
positioned through the use of a Proportional Integral (PID)
control process to provide a calculated supply-air temperature
into the zone. The supply air will maintain the space temperature
between the heating and cooling set points as indicated in Fig. 50.
The PremierLink control will integrate the compressors stages
with the economizer based on similar logic as the three routines
listed in the previous section. The SASP will float up and down
based on the error reduction calculations that compare space
temperature and space set point.
When outside-air temperature conditions require the economizer
to close for a compressor stage-up sequence, the economizer
control integrator is reset to zero after the stage-up sequence is
completed. This prevents the supply-air temperature from
dropping too quickly and creating a freeze condition that would
make the compressor turn off prematurely.
The high space set point is used for DX (direct expansion)
cooling control, while the economizer space set point is a
calculated value between the heating and cooling set points. The
economizer set point will always be at least one degree below the
cooling set point, allowing for a smooth transition from
mechanical cooling with economizer assist, back toeconomizer
cooling as the cooling set point is achieved. The compressors
may be used for initial cooling then the PremierLink controller
will modulate the economizer using an error reduction calculation
to hold the space temperature between the heating and cooling set
points. (See Fig. 50.)
The controller uses the following conditions to determine
economizer cooling:
SEnthalpy is Low
SSAT reading is available
SOAT reading is available
60
Page 61
SSPT reading is available
SOAT ± SPT
SEconomizer Position is NOT forced
If any of the above conditions are not met, the economizer
submaster reference (ECSR) is set to maximum limit and the
damper moves to minimum position. The operating sequence is
complete. The ECSR is recalculated every 30 seconds.
If an optional power exhaust is installed, as the outdoor-air
damper opens and closes, the power exhaust fans will be
energized and deenergized.
If field-installed accessory CO
PremierLink control, a PID-controlled demand ventilation
strategy will begin to operate. As the CO
increases above the CO
damper will be increased proportionally. As the CO
decreases because of the increase in fresh air, the outdoor-air
damper will be proportionally closed.
Heating -- Unit With Economi$er2, Premierlink Control
a Room
Every 40 seconds the controller will calculate the required heat
stages (maximum of 3) to maintain Supply-Air Temperature
(SAT) if the following qualifying conditions are met:
Sensor
2
sensors are connected tothe
2
level in the zone
set point, the minimum position of the
2
level
2
and
SIndoor fan has been on for at least 30 seconds.
SCOOL mode is not active.
SOCCUPIED, TEMP. COMPENSATED START or
HEAT mode is active.
SSAT reading is available.
SFire shutdown mode is not active.
If all of the above conditions are met, the number of heat stages is
calculated; otherwise the required number of heat stages will be
set to 0.
If the PremierLink controller determines that heat stages are
required, the economizer damper will be moved to minimum
position if occupied and closed if unoccupied.
Staging should be as follows:
If Heating PID STAGES=2
SHEA T STAGES=1 (50% capacity) will energize HS1
SHEAT STAGES=2 (100% capacity) will energize HS2
If Heating PID STAGES=3 and AUXOUT = HS3
SHEA T STAGES=1 (33% capacity) will energize HS1
SHEA T STAGES=2 (66% capacity) will energize HS2
SHEAT STAGES=3 (100% capacity) will energize HS3
Units With Humidi-Mizer
Dehumidification
Normal Design Operation
When the rooftop operates under the normal sequence of
operation, the compressors will cycle to maintain indoor
conditions. (See Fig. 51.)
The Humidi-MiZer adaptive dehumidification system includes a
factory-installed Motormaster low ambient control to keep the
head and suction pressure high, allowing normal design cooling
mode operation down to 0 F.
Subcooling Mode
When subcooling mode is initiated, this will energize (close) the
liquid line solenoid valve (LLSV) forcing the hot liquid
refrigerant to enter into the subcooling coil. (See Fig. 52.)
As the hot liquid refrigerant passes through the subcooling/ reheat
dehumidification coil, it is exposed to the cold supply airflow
coming through the evaporator coil. The liquid is further
Adaptive
System
subcooled to a temperature approaching the evaporator
leaving-air temperature. The liquid then enters a thermostatic
expansion valve (TXV) where the liquid drops to a lower
pressure. The TXV does not have a pressure drop great enough to
change the liquid to a 2-phase fluid, so the liquid then enters the
Acutrol device at the evaporator coil.
The liquid enters the evaporator coil at a temperature lower than
in standard cooling operation. This lower temperature increases
the latent capacity of the rooftop unit. The refrigerant passes
through the evaporator and is turned into a vapor. The air passing
over the evaporator coil will become colder than during normal
operation. However, as this same air passes over the subcooling
coil, it will be slightly warmed, partially reheating the air.
Subcooling mode operates only when the outside air
temperature is warmer than 40_F. A factory-installed temperature
switch located in the condenser section will lock out subcooling
mode when the outside temperature is cooler than 40_F.
The scroll compressors are equipped with crankcase heaters to
provide protection for the compressors due to the additional
refrigerant charge required by the subcooling/reheat coil.
When in subcooling mode, there is a slight decrease in system
total gross capacity (5% less), a lower gross sensible capacity
(20% less), and a greatly increased latent capacity (up to 40%
more).
C06135
Fig. 51 --- Humidi--MiZer Normal
Design Cooling Operation
C06136
Fig. 52 --- Humidi--MiZer Subcooling
Mode Operation
50HE,HJ
61
Page 62
4. Clean coil using a commercial coil cleaner or dishwasher
detergent in a pressurized spray canister. Wash both sides
of coil and flush with clean water. For best results,
back-flush toward return-air section to remove foreign
material. Flush condensate pan after completion.
5. Reinstall economizer and filters.
6. Reconnect wiring.
7. Replace access panels.
Condenser
Inspect coil monthly. Clean condenser coil annually, and as
required by location and outdoor air conditions.
One--Row Coil
Wash coil with commercial coil cleaner. It is not necessary to
remove top panel.
2-Row Coils
C06137
Fig. 53 --- Humidi--Mizert Hot Gas
Reheat Mode Operation
Clean coil as follows:
50HE,HJ
Hot Gas Reheat Mode
When the humidity levels in the space require humidity control, a
hot gas solenoid valve (specific to hot gas reheat mode only) will
open to bypass a portion of hot gas refrigerant around the
condenser coil. (See Fig. 53.)
This hot gas will mix with liquid refrigerant leaving the
condensercoilandflowtothesubcooling/reheat
dehumidification coil. Now the conditioned air coming off the
evaporator will be cooled and dehumidified, but will be warmed
to neutral conditions (72_Fto75_F) by the subcooling/reheat
dehumidification coil.
The net effect of the rooftop when in hot gas reheat mode is to
provide nearly all latent capacity removal from the space when
sensible loads diminish (when outdoor temperature conditions are
moderate). When in hot gas reheat mode, the unit will operate to
provide mostly latent capacity and extremely low sensible heat
ratio capability.
Similar to the subcooling mode of operation, hot gas reheat mode
operates only when the outside air temperature is warmer than
40_F. Below this temperature, a factory installed outside air
temperature switch will lockout this mode of operation.
See Table 36 for the Humidi-Mizer adaptive dehumidification
system sequence of operation.
Coil
1. Turn off unit power and tag disconnect.
2. Remove top panel screws on condenser end of unit.
3. Remove condenser coil corner post. (See Fig. 54.) To hold
top panel open, place coil corner post between top panel
and center post. (See Fig. 55.)
C06044
Fig. 54 --- Cleaning Condenser Coil
SERVICE
!
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could cause personal
injury or death.
When sevicing unit, shut off all electrical power to unit
and install lockout tag.
Step 1 —Cleaning
Inspect unit interior at the beginning of heating and cooling
season and as operating conditions require.
Evaporator
1. Turn unit power off, tag disconnect. Remove evaporator
coil access panel.
2. If economizer or two-position damper is installed, remove
economizerbydisconnectingMolexplugand
removing mounting screws.
3. Slide filters out of unit.
WARNING
Coil
C06045
Fig. 55 --- Propping Up Top Panel
62
Page 63
Table 35—Humidi-Mizer Adaptive Dehumidification System Sequence of Operation and
System Response — Single Compressor Unit (50HE003--006, 50HJ004-007)
THERMOSTAT INPUTECONOMIZER FUNCTION48HE, HJ UNIT OPERATION
HY1Y2OAT. < Economizer Set PointEconomizerComp. 1Subcooling ModeHot Gas Reheat Mode
NOTE: On a thermostat call for W1, all cooling and dehumidification will be off.
LEGEND
OAT --- Outdoor Air Temperature
Normal Operation
Fan Motor
Bearings
Fan motor bearings are permanently lubricated. No further
lubrication is required.No lubrica tion of condenser- fan or
evaporator- fan motors is requir ed.
Evaporator Fan Belt
Adjustment
Inspect evaporator fan belt for wear, proper belt tension, and
pulley alignment as conditions require or at the beginning of each
heating and air conditioning season. Refer to Step 7 -- Adjust
Evaporator Fan Speed for adjustment and alignment procedures.
Step 3 —Condenser--Fan Adjustment
Shut off unit power supply. Remove condenser-fan assembly
(grille, motor, motor cover, and fan) and loosen fan hub
setscrews. Adjust fan height as shown in Fig. 57. Tighten
setscrews and replace condenser-fan assembly.
50HE,HJ
C06046
Fig. 56 --- Separating Coil Sections
4. Remove device holding coil sections together at return end
of condenser coil. Carefully separate the outer coil section
3 to 4 in. from the inner coil section. (See Fig. 57.)
5. Use a water hose or other suitable equipment to flush
down between the 2 coil sections to remove dirt and
debris. Clean the outer surfaces with a stiff brush in the
normal manner.
6. Secure the sections together. Reposition the outer coil
section and remove the coil corner post from between the
top panel and center post. Install the coil corner and center
posts. Replace all screws.
Condensate
Drain
Check and clean each year at the start of the cooling season. In
winter, keep the drain dry or protect it against freeze-up.
Filters
Clean or replace at the start of each heating and cooling season, or
more often if operating conditions require it. Replacement filters
must be the same dimensions as the original filters.
Outdoor--Air Inlet Scr
een
Clean the screen with steam or hot water and a mild detergent. Do
not use disposable filters in place of screens.
Step 2 —Lubrication
essor
Compr
The compressor is charged with the correct amount of oil at the
factory.
UNITFAN HEIGHT (in.) — “A”
003-006 AND 007 ( 208/230 v)2.75
007 (460 v)3.50
C06138
Fig. 57 --- Condenser--Fan Adjustment
Step 4 —EconoMi$er IV Adjustment
Refer to Optional EconoMi$er IV and EconoMi$er2 section.
Step 5 —Refrigerant Charge
Amount of refrigerant charge is listed on unit nameplate (also
refer to Table 1). Refer to HVAC Servicing Procedures literature
available at your local distributor and the following procedures.
Unit panels must be in place when unit is operating during
charging procedure. Unit must operate a minimum of 10 minutes
before checking or adjusting refrigerant charge.
Charge
No
Use standard evacuating techniques. After evacuating system to
500 microns, weigh in the specified amount of refrigerant. (Refer
to Table 1 and unit information plate.)
63
Page 64
Low Charge
Cooling
Using Cooling Charging Charts, Fig. 58 --61, vary refrigerant
until the conditions of the charts are met. Note the charging charts
are different from type normally used. Charts are based on
charging the units to the correct superheat for the various
operating conditions. Accurate pressure gage and temperature
sensing device are required. Connect the pressure gauge to the
service port on the suction line. Mount the temperature sensing
device on the suction line and insulate it so that outdoor ambient
temperature does not affect the reading. Indoor-air cfm must be
within the normal operating range of the unit. An accurate
superheat, thermocouple--type or thermistor-- type thermometer,
and a gauge manifold are required when using the superheat
charging method for evaluating the unit charge. Do not use
mercury or small dial--type thermometers because they are not
adequate for this type of measurement.
50HE,HJ
C06140
Fig. 59 --- Cooling Charging Chart,
Standard 50HJ005
C06139
Fig. 58 --- Cooling Charging Chart,
Standard 50HJ004
Humidi--Mizer
System Charging
The system charge for units with the Humidi-MiZer adaptive
dehumidification system is greater than that of the standard unit
alone. The charge for units with this option is indicated on the
unit nameplate drawing. Also refer to Fig. 62-65. To charge
systems using the Humidi-MiZer adaptive dehumidification
system, fully evacuate, recover, and recharge the system to the
nameplate specified charge level. To check or adjust refrigerant
charge onsystems usingtheHumidi-MiZer adaptive
dehumidification system, charge per Fig. 62-65.
C06141
Fig. 60 --- Cooling Charging Chart,
Standard 50HJ006
64
Page 65
50HE,HJ
C06142
Fig. 61 --- Cooling Charging Chart,
Standard 50HJ007
C06143
Fig. 62 --- Cooling Charging Chart, 50HJ004 with
Optional Humidi--MiZer Adaptive Dehumidification System
C06144
Fig. 63 --- Cooling Charging Chart, 50HJ005 with
Optional Humidi--MiZer Adaptive Dehumidification System
NOTE: When using the charging charts, it is important that only
the subcooling/reheat dehumidification coil liquid line solenoid
valve be energized. The subcooling/reheat dehumidification coil
liquid line solenoid valve MUST be energized to use the charging
charts and the outdoor motor speed controller jumpered to run the
fanatfullspeed.
The charts reference a liquid pressure (psig) and temperature at a
point between the condenser coil and the subcooling/reheat
dehumidification coil. A tap is provided on the unit to measure
liquid pressure entering the subcooling/reheat dehumidification
coil.
IMPORTANT: The subcooling mode charging charts (Fig.
62--65) are to be used ONLY with units having the
Humidi--MiZer adaptive dehumidification system. DO NOT use
standard charge (Fig. 58--61) for units with Humidi-- MiZer
system, and DO NOT use Fig. 62--65 for standard units.
65
Page 66
If a charging device is used, temperature and pressure readings
must be accomplished using the charging charts.
698.0
648.0
598.0
548.0
498.0
448.0
FC
125 52
115 4 6
105 41
95 35
85 29
75 24
C06148
Suction Line Pressure (kpa)
50HE -- 2 TO N CHARGING CHART
Suction Line Temperature (deg C)
5.510.515.520.525.5
105.0
100.0
95.0
90.0
85.0
80.0
75.0
Suction Line Pressure (psig)
70.0
65.0
42526272
SuctionLineTemp(degF)
50HE,HJ
C06145
Fig. 64 --- Cooling Charging Chart, 50HJ005 with
Fig. 66 --- Cooling Charging Chart,
Standard 50HE003
Optional Humidi--MiZer Adaptive Dehumidification System
50HE -- 3 TON CHARGING CHART
SuctionLine Temperature (deg C)
6.111.116.121.1
FC
115 4 6
105 41
95 35
85 29
75 24
C06146
Fig. 65 --- Cooling Charging Chart, 50HJ007 with
Optional Humidi--MiZer Adaptive Dehumidification System
To Use Cooling Charging Chart, Standard
Unit
Take the outdoor ambient temperature and read the suction
pressure gage. Refer to charts to determine what suction
temperature should be. If suction temperature is high, add
refrigerant. If suction temperature is low, carefully recover some
of the charge. Recheck the suction pressure as charge is adjusted.
NOTE: When using the charging charts, it is important that only
the subcooling/reheat dehumidification coil liquid line solenoid
valve be energized. The subcooling/reheat dehumidification coil
liquid line solenoid valve MUST be energized to use the charging
charts and the outdoor motor speed controller jumpered to run the
fanatfullspeed.
IMPORTANT: Refer to Troubleshooting Tables for additional
information.
Step 6 —Replacement Parts
A complete list of replacement parts may be obtained from any
Carrier distributor upon request.
TROUBLESHOOTING
Step 1 —Unit Troubleshooting
Refer to Tables 34-38 for unit troubleshooting details.
Step 2 —Economi$er IV Troubleshooting
See Table 39 for EconoMi$er IV logic.
A functional view of the EconoMi$er IV is shown in Fig. 67.
Typical settings, sensor ranges, and jumper positions are also
shown. An EconoMi$er IV simulator program is available from
CarriertohelpwithEconoMi$er IVtrainingand
troubleshooting.
Economi$er IV Pr
This procedure is used to prepare the EconoMi$er IV for
troubleshooting. No troubleshooting or testing is done by
performing the following procedure.
NOTE: This procedure requires a 9-v battery, 1.2 kilo-ohm
resistor, and a 5.6 kilo-ohm resistor which are not supplied with
the EconoMi$er IV.
IMPORTANT: Be sure to record the positions of all
potentiometers before starting troubleshooting.
1. Disconnect power at TR and TR1. All LEDs should be
off. Exhaust fan contacts should be open.
2. Disconnect device at P and P1.
3. Jumper P to P1.
eparation
4. Disconnect wires at T and T1. Place 5.6 kilo-ohm resistor
across T and T1.
5. Jumper TR to 1.
6. Jumper TR to N.
7. If connected, remove sensor from terminals S
O
Connect 1.2 kilo-ohm 4074EJM checkout resistor across
terminals S
8. Put 620-ohm resistor across terminals S
O
and +.
and +.
R
9. Set minimum position, DCV set point, and exhaust
potentiometers fully CCW (counterclockwise).
10. Set DCV maximum position potentiometer fully CW
(clockwise).
11. Set enthalpy potentiometer to D.
12. Apply power (24 vac) to terminals TR and TR1.
Differential
Enthalpy
To check differential enthalpy:
1. Make sure EconoMi$er IV preparation procedure has been
performed.
2. Place 620-ohm resistor across S
3. Place 1.2 kilo-ohm resistor across S
O
and +.
and +. The Free
R
Cool LED should be lit.
4. Remove 620-ohm resistor across S
and +. The Free Cool
O
LED should turn off.
5. Return EconoMi$er IV settings and wiring to normal
after completing troubleshooting.
Enthalpy
Single
To check single enthalpy:
1. Make sure EconoMi$er IV preparation procedure has been
performed.
2. Set the enthalpy potentiometer to A (fully CCW). The
Free Cool LED should be lit.
3. Set the enthalpy potentiometer to D (fully CW). The Free
Cool LED should turn off.
4. Return EconoMi$er IV settings and wiring to normal
after completing troubleshooting.
DCV (Demand Controlled Ventilation) and Power
Exhaust
To check DCV and Power Exhaust:
1. Make sure EconoMi$er IV preparation procedure has been
performed.
2. Ensure terminals AQ and AQ1 are open. The LED for
both DCV and Exhaust should be off. The actuator should
be fully closed.
3. Connect a 9-v battery to AQ (positive node) and AQ1
(negative node). The LED for both DCV and Exhaust
should turn on. The actuator should drive to between 90
and 95% open.
4. Turn the Exhaust potentiometer CW until the Exhaust
LED turns off. The LED should turn off when the
potentiometer is approximately 90%. The actuator should
remain in position.
5. Turn the DCV set point potentiometer CW until the DCV
LED turns off. The DCV LED should turn off when the
potentiometer is approximately 9 v. The actuator should
drive fully closed.
6. Turn the DCV and Exhaust potentiometers CCW until the
Exhaust LED turns on. The exhaust contacts will close 30
to 120 seconds after the Exhaust LED turns on.
7. Return EconoMi$er IV settings and wiring to normal
after completing troubleshooting.
and +.
50HE,HJ
67
Page 68
DCV Minimum and Maximum
To check the DCV minimum and maximum position:
1. Make sure EconoMi$er IV preparation procedure has been
performed.
2. Connect a 9-v battery to AQ (positive node) and AQ1
(negative node). The DCV LED should turn on. The
actuator should drive to between 90 and 95% open.
3. Turn the DCV Maximum Position potentiometer to
midpoint. The actuator should drive to between 20 and
80% open.
4. Turn the DCV Maximum Position potentiometer to fully
CCW. The actuator should drive fully closed.
5. Turn the Minimum Position potentiometer to midpoint.
The actuator should drive to between 20 and 80% open.
6. Turn the Minimum Position Potentiometer fully CW. The
actuator should drive fully open.
7. Remove the jumper from TR and N. The actuator should
drive fully closed.
50HE,HJ
8. Return EconoMi$er IV settings and wiring to normal
after completing troubleshooting.
Supply--Air
Input
Position
Economi$er IV Troubleshooting
This procedure is used to return the EconoMi$er IV to operation.
No troubleshooting or testing is done by performing the
following procedure.
1. Disconnect power at TR and TR1.
2. Set enthalpy potentiometer to previous setting.
3. Set DCV maximum position potentiometer to previous
setting.
4. Set minimum position, DCV set point, and exhaust
potentiometers to previous settings.
5. Remove 620-ohm resistor from terminals S
6. Remove 1.2 kilo-ohm checkout resistor from terminals S
and +. If used, reconnect sensor from terminals SOand +.
7. Remove jumper from TR to N.
8. Remove jumper from TR to 1.
9. Remove 5.6 kilo-ohm resistor from T and T1. Reconnect
wires at T and T1.
10. Remove jumper from P to P1. Reconnect device at P and
P1.
11. Apply power (24 vac) to terminals TR and TR1.
Completion
and +.
R
O
To check supply-air input:
1. Make sure EconoMi$er IV preparation procedure has been
performed.
2. Set the Enthalpy potentiometer to A. The Free Cool LED
turns on. The actuator should drive to between 20 and
80% open.
3. Remove the 5.6 kilo-ohm resistor and jumper T to T1. The
actuator should drive fully open.
4. Remove the jumper across T and T1. The actuator should
drive fully closed.
5. Return EconoMi$er IV settings and wiring to normal
after completing troubleshooting.
Power failure.Call power company.
Fuse blown or circuit breaker tripped.Replace fuse or reset circuit breaker.
Defective thermostat, contactor, transformer, or
control relay.
Insufficient line voltage.Determine cause and correct.
Incorrect or faulty wiring.Check wiring diagram and rewire correctly.
Thermostat setting too high.Lower thermostat setting below room temperature.
Faulty wiring or loose connections in compres-
sor circuit.
Compressor motor burned out, seized, or in-
relay.
One leg of 3-phase power dead.Replace fuse or reset circuit breaker. Determine
Refrigerant overcharge or undercharge.Recover refrigerant, evacuate system, and recharge
Defective compressor.Replace and determine cause.
Insufficient line voltage.Determine cause and correct.
Blocked condenser.Determine cause and correct.
Defective run/start capacitor, overload, or start
relay.
Defective thermostat.Replace thermostat.
Faulty condenser-fan motor or capacitor.Replace.
Restriction in refrigerant system.Locate restriction and remove.
Dirty air filter.Replace filter.
Unit undersized for load.Decrease load or increase unit size.
Thermostat set too low.Reset thermostat.
Low refrigerant charge.Locate leak, repair, and recharge.
Leaking valves in compressor.Replace compressor.
Air in system.Recover refrigerant, evacuate system, and recharge.
Condenser coil dirty or restricted.Clean coil or remove restriction.
Dirty air filter.Replace filter.
Dirty condenser coil.Clean coil.
Refrigerant overcharged.Recover excess refrigerant.
Air in system.Recover refrigerant, evacuate system, and recharge.
Condenser air restricted or air short-cycling.Determine cause and correct.
Low refrigerant charge.Check for leaks, repair, and recharge.
Compressor valves leaking.Replace compressor.
Restrictioninliquidtube.Remove restriction.
High heat load.Check for source and eliminate.
Compressor valves leaking.Replace compressor.
Refrigerant overcharged.Recover excess refrigerant.
Dirty air filter.Replace filter.
Low refrigerant charge.Check for leaks, repair, and recharge.
Metering device or low side restricted.Remove source of restriction.
Insufficient evaporator airflow.Increase air quantity. Check filter and replace if neces-
Temperature too low in conditioned area.Reset thermostat.
Outdoor ambient below 25 F.Install low- a mbient kit.
Time off delay not finished.Wait for 30-second off delay.
Replace component.
Check wiring and repair or replace.
Determine cause. Replace compressor.
Determine cause and replace.
cause.
to nameplate.
Determine cause and replace.
sary.
50HE,HJ
69
Page 70
Table 37—Humidi-MiZer Adaptive Dehumidification System Subcooling Mode Service Analysis
Subcooling Mode (Liquid Reheat)
Will Not Energize.
Low System Capacity.Low refrigerant ch arge or frosted evaporator coil.1. Check charge amount. Charge per Fig. 59-62.
Loss of Compressor Superheat
Conditions with Subcooling/Reheat
Dehumidification Coil Energized.
No power to control transformer from
evaporator-fan motor.
No power from control transformer to liquid line
solenoid valve.
Liquid line solenoid valve will not operate.1. Solenoid coil defective; replace.
Liquid line solenoid valve will not open.Valve is stuck closed; replace valve.
Thermostatic expansion valve (TXV).1. Check TXV bulb mounting, and secure tightly to suc-
Check power source and evaporator-fan relay. Ensure all
wire connections are tight.
1. Fuse open; check fuse. Ensure continuity of wiring.
2. Low-pressure switch open. Cycle unit off and allow
low-pressure switch to reset. Replace switch if it will
not close.
3. Transformer bad; check transformer.
2. Solenoid valve stuck open; replace.
2. Evaporator coil frosted; check and replace low-pressure switch if necessary.
tion line.
2. Replace TXV if stuck open or closed.
Table 38—Humidi-MiZer Adaptive Dehumidification System Hot Gas Reheat Mode Service Analysis
PROBLEMCAUSEREMEDY
50HE,HJ
Reheat Mode Will Not Energize.No power to control transformer from
Loss of Compressor Superheat
Conditions with Subcooling/Reheat
Dehumidification Coil Energized.
Excessive Superheat.Liquid line solenoid valve will not operate.Valve is stuck, replace valve.
PROBLEMCAUSEREMEDY
evaporator-fan motor.
No power from control transformer to hot gas
line solenoid valve
Hot gas line solenoid valve will not operate.1. Solenoid coil defective; replace.
Low refrigerant charge or frosted evaporator coil.1. Check charge amount. Charge per Fig. 59-62.
Thermostatic expansion valve (TXV).1. Check TXV bulb mounting, and secure tightly to suc-
Hot gas line solenoid valve will not close.Valve is stuck; replace valve.
Check power source and evaporator-fan relay. Ensure all
wire connections are tight.
1. Fuse open; check fuse. Ensure continuity of wiring.
2. Low-pressure switch open. Cycle unit off and allow
low-pressure switch to reset. Replace switch if it will
not close.
3. Transformer bad; check transformer.
2. Solenoid valve stuck closed; replace.
2. Evaporator coil frosted; check and replace low-pressure switch if necessary.
tion line.
2. Replace TXV if stuck open or closed.
Table 39—EconoMi$er IV Input/Output Logic
INPUTSOUTPUTS
Demand Control
Ventilation (DCV)
Below set
(DCV LED Off)
High
(Free Cooling LED Off)
Enthalpy*
OutdoorReturn
LowOn OnOnOnMinimum positionClosed
Y1 Y2
On OffOnOff
Off OffOffOff
Low
(Free Cooling LED On)
HighOn OnOnOffModulating** (between min.
On OffOffOff
Off OffOffOffMinimum positionClosed
Above set
(DCV LED On)
High
(Free Cooling LED Off)
LowOn OnOnOnModulating†† (between min.
On OffOnOff
Off OffOffOff
Low
(Free Cooling LED On)
HighOn OnOnOffModulating***Modulating†††
On OffOffOff
Off OffOffOff
*For single enthalpy control, the module compares outdoor enthalpy to the ABCD set point.
†Power at N terminal determines Occupied/Unoccupied setting: 24 vac (Occupied), no power (Unoccupied).
**Modulation is based on the supply-air sensor signal.
††Modulation is based on the DCV signal.
***Modulation is based on the greater of DCV and supply-air sensor signals, between minimum position and either maximum position (DCV) or fully open (sup-
ply-air signal).
†††Modulation is based on the greater of DCV and supply-air sensor signals, between closed and either maximum position (DCV) or fully open (supply-airsig-
nal).
CompressorNTerminal†
Stage1Stage
2
position and full-open)
position and DCV maximum)
OccupiedUnoccupied
Damper
Modulating** (between
closed and full-open)
Modulating†† (between
closed and DCV
maximum)
70
Page 71
Fig. 70 --- EconoMi$er IV Functional View
50HE,HJ
C06053
71
Page 72
START-UP CHECKLIST
(Remove and Store in Job File)
I. PRELIMINARY INFORMATION
MODEL NO.:SERIAL NO.:
DA TE:TECHNICIAN:
II. PRE-START-UP (insert checkmark in box as each item is completed)
j VERIFY THA T JOBSITE VOL T AGE AGREES WITH VOLT AGE LISTED ON RATING PLA TE
j VERIFY THA T ALL PACKAGING MATERIALS HAVE BEEN REMOVED FROM UNIT
j REMOVE ALL SHIPPING HOLDDOWN BOL TS AND BRACKETS PER INST ALLA TION INSTRUCTIONS
j VERIFY THA T CONDENSA TE CONNECTION IS INSTALLED PER INST A LLATION INSTRU CTIO NS
j CHECK ALL ELECTRICAL CONNECTIONS AND TERMINALS FOR TIGHTNESS
j CHECK GAS PIPING FOR LEAKS
j CHECK THA T RETURN (INDOOR) AIR FIL TERS ARE CLEAN AND IN PLACE
50HE,HJ
j VERIFY THAT UN IT INSTALLA TI ON IS LEVEL
j CHECK FAN WHEELS AND PROP ELLER FOR LOCATION IN HOUSING/ORIFICE AND SETSCREW
TIGHTNESS
j CHECK TO ENSURE THAT ELECTRICAL WIRING IS NOT IN CONTA CT WITH REFRIGERANT LINES
OR SHARP METAL EDGES
j CHECK PULLEY ALIGNM ENT AND BEL T TENSIO N PER INSTA LLATION INSTRU CTIO NS
III. START-UP
ELECTRICAL
SUPPL Y VOL T AGEL1-L2L2-L3
L3-L1
COMPRESSOR AMPSL1L2L3
INDOOR-FAN AMPSL1L2L3
TEMPERATURES
OUTDOOR-AIR TEMPERA TURE
RETURN-A IR TEMPERATURE
COOLING SUPPLY AIR
DB
DBWB
DBWB
PRESSURES (Cooling Mode)
REFRIGERANT SUCTION
REFRIGERANT DISCHARGE
PSIGF
PSIGF
j VERIFY THA T 3-PHASE FAN MOTOR AND BLOWER ARE ROTATING IN CORRECT DIRECTION. IF THEY
ARE NOT ROT ATING IN CORRECT DIRECTION, LOCKING COLLAR MUST BE RE--TIGHTENED AFTER
CORRECTING DIRECTION OF ROTATION
j VERIFY THAT 3-PHASE SCROLL COMPRESS OR IS ROTATING IN THE CORRECT DIRECTION
j VERIFY REFRIGERANT CHARGE USING CHARGING CHARTS
GENERAL
j SET ECONOMIZER MINIMUM VENT AND CHANGEOVER SETTINGS TO MATCH JOB REQUIREMEN TS
(IF EQUIPPED)
Copyright 2006 Carrier Corp. S 7310 W. Morris St. S Indianapolis,IN 46231
Manufacturer reserv es the right to change, at any time, specifications and designs without notice and without oblig ations.
Printed in U.S.A.Edition Date:09/06
72
Catalog No:50H-- 1SI
Replaces:50HJ--31SI
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