Carrier 38BNB018-036 Specifications

Duct-Free Systems
Cooling Only and Heat Pump Units
Low Ambient Temperature Controller Accessory
Cancels: IIK 538-09-1
IIK 538-09-7
IIK 538-09-8
4/1/05
Installation Instructions
Part Number 53DS-900---060
NOTE: Read and become familiar with these instructions
before beginning installation.
SAFETY CONSIDERATIONS
Installing and servicing air-conditioning equipment can be
hazardous due to system pressures and electrical components.
Only trained and qualified personnel should install or service
air-conditioning equipment. When working on air-conditioning
equipment, observe the precautions provided in literature, tags,
and labels attached to the unit.
ambient temperature controller is designed to maintain a condensing pressure of 200 to 225 psig by cycling the outdoor-fan
motor. No field adjustments or calibrations are required.
All of the components necessary for installing the low
ambient temperature controller are included in the package.
This kit consists of a pressure switch and installation instructions. When unpacking the accessory, carefully inspect for
shipping damage. If damage is evident, return for replacement.
INSTALLATION
Step 1 — Mount Pressure Switch
Electrical shock can cause personal injury or death. Before
beginning any modification or installation of this kit, be
sure the main electrical disconnect is in the off position.
Ensure power is disconnected to the fan coil unit. On some
systems both the fan coil and the outdoor unit may be on the
same disconnect. Tag the disconnect switch with a suitable
warning label. There may be more than one disconnect.
GENERAL
IMPORTANT: Heat pump models require an isolation
relay (part numbers HN61KK066 for a 24-v coil,
HN61KK912 for a 120-v coil, HN61KK913 for a
240-v coil) to prevent fan cycling in heat pump mode.
The low ambient temperature controller must be
installed in conjunction with the accessory wind baffle. An accessory winter start control (part number
KAAWS0101AAA) is recommended (cooling only
018-060 units) when low outdoor temperatures may be
encountered or when nuisance tripping of the
low-pressure switch (factory installed) may be
encountered.
The winter-start control package consists of a time-delay that must be wired across the low-pressure switch.
The time-delay relay will bypass the low-pressure switch
for 3 minutes on start-up before the low-pressure switch
becomes part of the control circuit.
A crankcase heater is also recommended when using
low ambient temperature control.
These instructions cover the installation of low ambient
temperature controller accessory kit on the duct-free cooling
and heat pump condensing units.
The low ambient temperature head pressure controller
(HPC) is a fan control device activated by a high cycle rate
pressure switch. It is specifically designed for use with ductfree systems, cooling only and heat pump units. The low
1. Place 3 drops of compressor oil in the pressure switch for
lubrication.
2. Mount the pressure switch as shown in Fig. 1-3.
3. Coil up the excess wire and secure next to the pressure
switch.
Step 2 — Connect Power Wiring — All wiring must
comply with local codes and National Electrical Code (NEC)
requirements. See Fig. 4 for accessory wiring.
NOTE: An adapter tube is required for the 38CG024 unit.
SERVICE PORT
DISCHARGE LINE*
LOW AMBIENT
TEMPERATURE
CONTROL
*For 38BN units the service port is on the liquid line.
Fig. 1 — Low Ambient Temperature Control
Location (38HDC,HDL,QR,SB,SC,CG, 38CS030,
38BK018-024, 38BN, 538A,B,J)
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
PC 111
Catalog No. 533-80124
Printed in U.S.A.
Form 38-57SI
Pg 1
4-05
Replaces: 38-1SI
Book 1 4
38-55SI
Tab 3e 2f
LOW
AMBIENT
TEMPERATURE
CONTROL
ADAPTER
TUBE
LOW
AMBIENT
TEMPERATURE
CONTROL
Fig. 3 — 38CG,CS018 and 024 Units
with Adapter Tube
Fig. 2 — Low Ambient Temperature
Control Location
(38AN,BK009-012, 538C,D)
Model No.
38AN009
38AN012
538A Series
538J Series
538C--009
538C--012
COOLING ONLY MODELS
Wire Color
Model No.
White
38HDC018-060
White
38HDL018-060
Black
38BNB018-036
Black
38CG-018-030
White
38SC-030
White
SEE CHART
FOR COLOR
Wire Color
Black
Black
White
White
White
LAC
BLU
BLU
FAN MOTOR
LEGEND
LAC — Low Ambient (Temperature) Control
Fig. 4 — Low Ambient Temperature Control Wiring
2
TO TERMINAL
CONNECTION
MAIN POWER
HEAT PUMP MODELS
(Reversing Valve Energized in Cooling)
Model No.
Wire Color
Model No.
Wire Color
38BK018
Black
38QR018-060
Black
38BK024
Black
538B--018-060
Black
538DAX009
Black
538DNX024
Black
“RVS” *(REVERSING VALVE)
1
3
2
“RVS” *(REVERSING VALVE)
IR
SEE CHART
FOR COLOR
LAC
OUTDOOR
FAN MOTOR
TO TERMINAL
CONNECTION
MAIN POWER
HEAT PUMP MODELS
(Reversing Valve Energized in Heating)
Model No.
Wire Color
Model No.
Wire Color
38BK009
Black
38BNE018-036 White
38BK012
Black
38CS-018-030
White
538DAX009
Black
38SB-030
White
538DNX012
Black
“RVS” *(REVERSING VALVE)
1
3
2
“RVS” *(REVERSING VALVE)
IR
SEE CHART
FOR COLOR
LAC
OUTDOOR
FAN MOTOR
TO TERMINAL
CONNECTION
MAIN POWER
LEGEND
IR
— Isolation Relay
LAC — Low Ambient (Temperature) Control
*Isolation relay coil (line voltage) should be wired in parallel with the reversing valve.
NOTE: Make sure to use the correlating isolation relay (based on coil voltage) with the proper line voltage.
Fig. 4 — Low Ambient Temperature Control Wiring (cont)
The outdoor-fan motor will not operate until the condensing
pressure reaches the control set point of 225 psig (± 10 psig).
When the set point is reached, the outdoor fan will cycle to
maintain the set point condensing pressure.
If the low ambient temperature controller does not operate
correctly:
• Ensure that power is being supplied to the system.
• Check condensing pressure: if condensing pressure is
below 200 psig the outdoor-fan motor should be off and
there should be no voltage across the 2 blue fan power
leads coming out of the controller. If condensing pressure is about 225 psig or greater, the outdoor-fan motor
should be on and will cycle off at around 200 psig.
CHECK OPERATION
Before starting the system to check operation of low
ambient temperature controller, ensure that the power wiring
and location of controller assembly are correct.
To check operation of low ambient temperature controller:
1. Turn power on to system.
2. Set thermostat below room temperature.
3. Ensure that there is the standard 3-minute time delay for
the microprocessor controlled high wall fan coil systems.
4. Check time delay of installed accessories:
Under-ceiling (40AQ/619C) or cassette (40QK/619F) fan
coils using the duct-free 24-v thermostat delay settings: 2
or 4 minute delay.
3
Copyright 2005 Carrier Corporation
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
PC 111
Catalog No. 533-80124
Printed in U.S.A.
Form 38-57SI
Pg 4
8-05A
4-05
Replaces: 38-1SI
Book 1 4
38-55SI
Tab 3e 2f