York H4TS024 User manual

STEALTH
SPLIT-SYSTEM
AIR CONDITIONING
16 SEER 2 TO 5 TONS
035-14511-001 Rev. A (0602)
TABLE OF CONTENTS
GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . 2
SAFETY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
INSPECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
LIMITATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
UNIT INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . 3
LOCATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
GROUND INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . 3
ROOF INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
UNIT PLACEMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
TXV INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . 3
PIPING CONNECTIONS . . . . . . . . . . . . . . . . . . . . . . . . 4
PRECAUTIONS DURING LINE INSTALLATION . . . . . . . . 4
PRECAUTIONS DURING BRAZING OF LINES . . . . . . . . . 5
PRECAUTIONS DURING BRAZING ANGLE VALVE . . . . 5
ELECTRICAL CONNECTIONS . . . . . . . . . . . . . . . . . . 6
GENERAL INFORMATION & GROUNDING . . . . . . . . . . . 6
POWER WIRING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
ACCESSORY WIRING . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
THERMOSTAT MOUNTING / WIRING . . . . . . . . . . . . . . . . 7
DEHUMIDIFICATION CONTROL . . . . . . . . . . . . . . . . . . . . 7
FIELD CONNECTIONS - CONTROL WIRING . . . . . . . . . . 7
INDOOR BLOWER SPEED SETTINGS . . . . . . . . . . . . . . . 7
SYSTEM CHARGE . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
REFRIGERANT LINE CHARGES . . . . . . . . . . . . . . . . . . . . 9
SERVICING AND VERIFY . . . . . . . . . . . . . . . . . . . . . . . . . 9
ENERGIZE CRANKCASE HEATER . . . . . . . . . . . . . . 10
SYSTEM OPERATION . . . . . . . . . . . . . . . . . . . . . . . . 10
FIRST STAGE COOLING . . . . . . . . . . . . . . . . . . . . . . . . . 10
SECOND STAGE OF COOLING . . . . . . . . . . . . . . . . . . . 10
DEHUMIDIFICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
ANTI-SHORT CYCLE TIMER . . . . . . . . . . . . . . . . . . . . . . 10
PRESSURE SWITCH OPERATION . . . . . . . . . . . . . . . . . 10
RESETTING FAULT CONDITIONS . . . . . . . . . . . . . . . . . 11
INDICATIONS OF PROPER OPERATION . . . . . . . . . . . . 11
NOTICE TO OWNER . . . . . . . . . . . . . . . . . . . . . . . . . 11
MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
WIRING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
CAUTION:READ ALL SAFETY GUIDES BEFORE YOU
START TO INSTALL YOUR UNIT.
SAVE THIS MANUAL
INSTALLATION
INSTRUCTION
MODELS: H4TS024
H4TS030
H4TS036
H4TS048
H4TS060

035-14511-001 Rev. A (0602)
2Unitary Products Group
GENERAL INFORMATION
This instruction covers the installation of the following Stealth
air conditioning units.
The outdoor condensing units are designed to be installed
with corresponding variable speed air handlers or furnaces,
two stage furnaces and single speed air handlers or furnaces
and a corresponding coil with sweat connect lines. Each unit
is factory charged with refrigerant sufficient for the smallest
indoor evaporator coil plus 15 feet of field supplied vapor and
liquid lines. A balanced port hard shut-off TXV kit must be
used for optimum system performance.
SAFETY
Use this instruction in conjunction with the instruction for the
appropriate indoor evaporator coil, variable speed air handler
or furnace and other accessories. Read all instructions before
installing the unit.
Installer should pay particular attention to the words: NOTE,
CAUTION and WARNING.
NOTES are intended to clarify or make the installation easier.
CAUTIONS are given to prevent equipment damage.
WARNINGS are given to alert the installer that personal
injury and/or equipment damage may result if installation pro-
cedures are not handled properly.
INSPECTION
As soon as a unit is received, it should be inspected for possi-
ble damage during transit. If damage is evident, the extent of
the damage should be noted on the carrier's freight bill. A
separate request for inspection by the carrier's agent should
be made in writing. See Local Distributor for more informa-
tion.
LIMITATIONS
The unit should be installed in accordance with all national
and local safety codes and the limitations listed below:
1. Limitations for the indoor unit, coil and appropriate
accessories must also be observed.
2. Optimal performance is gained by using a variable speed
air handler or furnace. Special care must be given when
matched with a single speed blower (furnace or air han-
dler) and a relay kit to maintain the proper dehumidifica-
tion. See section on dehumidification for details.
3. The outdoor unit must not be installed with any duct work
in the air stream. The outdoor fan is the propeller type
and is not designed to operate against any additional
external static pressure.
4. The unit should not be operated in cooling mode at out-
door temperatures below 60°F. The unit is not
designed to operate with a low ambient kit. Do not
modify the control system to operate with any type of low
ambient kit.
5. Indoor evaporator coil orifice must be removed prior to
the installation of a factory supplied balanced port TXV
kit.
This product must be installed in strict compliance
with the enclosed installation instructions and any
applicable local, state, and national codes including,
but not limited to, building, electrical, and mechanical
codes.
Incorrect installation may create a condition where
the operation of the product could cause personal
injury or property damage.
FIGURE 1 : Typical Residential Outdoor Unit Location
THERMOSTAT
TO
INDOOR
BLOWER
TO COIL
NEC
CLASS 2
WIRING
NEC
CLASS 1
WIRING
TO
POWER
SUPPLY
WEATHERPROOF
DISCONNECT
SWITCH
Seal opening(s) with permagum
or equivalent
24” SERVICE ACCESS
CLEARANCE
48” OVERHEAD
CLEARANCE
12” REAR AND
SIDES
NOTE: All outdoor wiring must be weatherproof

035-14511-001 Rev. A (0602)
Unitary Products Group 3
UNIT INSTALLATION
LOCATION
Before starting the installation, select and check the suitability
of the location for both the indoor and outdoor unit. Observe
all limitations and clearance requirements.
The outdoor unit must have sufficient clearance for air
entrance to the condenser coil, for air discharge and for ser-
vice access. See Figure 1.
If the unit is to be installed on a hot sun exposed roof or a
black-topped ground area, the unit should be raised suffi-
ciently above the roof or ground to avoid taking the accumu-
lated layer of hot air into the outdoor unit.
Provide an adequate structural support.
GROUND INSTALLATION
The unit may be installed at ground level on a solid base that
will not shift or settle, causing strain on the refrigerant lines
and possible leaks. Maintain the clearances shown in Figure
1 and install the unit in a level position. Isolate the base from
the structure to avoid noise or vibration transmission.
Normal operating sound levels may be objectionable if the
unit is placed directly under windows of certain rooms (bed-
rooms, study, etc.).
Isolate the unit from rain gutters to avoid any possible wash
out of the foundation.
ROOF INSTALLATION
When installing units on a roof, the structure must be capable
of supporting the total weight of the unit, including a pad, lin-
tels, rails, etc., which should be used to minimize the trans-
mission of sound or vibration into the conditioned space.
UNIT PLACEMENT
1. Provide a base in the pre-determined location.
2. Remove the shipping carton and inspect for possible
damage.
3. Compressor tie-down bolts should remain tightened.
4. Position the unit on the base provided.
5. Sit unit on the (4) rubber elevating grommets if provided.
Use grommet kit 1SG0601 if not provided. These should
be positioned as shown in Figure 2 to reduce noise and
allow for proper drainage.
NOTE: The base pan may differ in appearance, but the
location of grommets is the same.
6. Make a hole(s) in the structure wall large enough to
accommodate the insulated vapor line, the liquid line and
the wiring.
TXV INSTALLATION
This condensing unit requires the installation of a thermal
expansion valve. The TXV controls the superheat of the
refrigerant at the outlet of the evaporator coil, ensuring the
proper refrigerant temperature at the suction of compressor.
Following are the basic steps for installing the TXV. For detail
instructions, refer to the Installation Instructions accompany-
ing the TXV kit.
Install TXV kit as follows:
1. First, relieve the holding charge by depressing the
Schrader valve located in the end of the liquid line.
2. After holding charge is completely discharged, loosen
and remove the liquid line fitting from the orifice distribu-
tor assembly. Note that the fitting has right hand
threads.
3. Remove the orifice from the distributor body using a
small diameter wire or paper clip. Orifice is not used
when the TXV assembly is installed.
4. After orifice is removed, install the thermal expansion
valve to the orifice distributor assembly with supplied fit-
tings. Hand tighten and turn an additional 1/8 turn to
seal. Do not overtighten fittings.
5. Re-install the liquid line to the top of the thermal expan-
sion valve. Hand modify the liquid line to align with cas-
ing opening.
6. Install the TXV equalizer line into the vapor line as fol-
lows:
a. Select a location on the vapor line for insertion of the
equalizer line which will not interfere with TXV bulb
placement.
b. Use an awl to punch through the suction tube and
insert the awl to a depth to achieve a 1/8 inch diam-
eter hole.
7. Install TXV equalizer line in 1/8 inch hole previously
made in vapor line. Equalizer line can be bottomed out in
vapor line as end of equalizer line is cut on 45 degrees
angle to prevent blockage. Braze equalizer line making
sure that tube opening is not brazed closed.
FIGURE 2 : Positioning Grommets
UNIT
BASE
PAN
RUBBER
ELEVATING
GROMMETS
UNIT
BASE
PAN
NOTE:
DO NOT BLOCK DRAINAGE
HOLES WITH GROMMETS.
The evaporator coil is under 30 psig pressure.

035-14511-001 Rev. A (0602)
4Unitary Products Group
All connections to be brazed are copper-to-copper and
should be brazed with a phosphorous-copper alloy material
such as Silfos-5 or equivalent. DO NOT use soft solder.
Install the TXV bulb to the vapor line near the equalizer line,
using the two bulb clamps furnished with the TXV assembly.
Ensure the bulb is making maximum contact. Refer to TXV
installation instruction for view of bulb location.
8. Bulb should be installed on a horizontal run of the vapor
line if possible. On lines under 7/8" OD the bulb may be
installed on top of the line. With 7/8" OD and over, the
bulb should be installed at the position of about 4 or 8
o'clock.
9. If bulb installation is made on a vertical run, the bulb
should be located at least 16 inches from any bend, and
on the tubing sides opposite the plane of the bend. On
vertical bulb installations, the bulb should be positioned
with the bulb tail at the top, so that the bulb acts as a res-
ervoir.
10. Bulb should be insulated using thermal insulation pro-
vided to protect it from the effect of the surrounding
ambient temperature.
PIPING CONNECTIONS
The outdoor condensing unit may be connected to the indoor
evaporator coil using field supplied refrigerant grade copper
tubing that is internally clean and dry. Units should be
installed only with the tubing sizes for approved system com-
binations as specified in Tabular Data Sheet. The charge
given is applicable for total tubing lengths up to 15 feet. See
Application Data Form 690.01-AD1V for installing tubing of
longer lengths and elevation differences.
NOTE: Using a larger than specified line size could result in
oil return problems. Using a line size smaller than specified
will result in loss of capacity and other problems caused by
insufficient refrigerant flow. Slope horizontal vapor lines at
least 1” every 20 feet toward the outdoor unit to facilitate
proper oil return.
PRECAUTIONS DURING LINE INSTALLATION
1. Install the lines with as few bends as possible. Care must
be taken not to damage the couplings or kink the tubing.
Use clean, hard drawn copper tubing where no apprecia-
ble amount of bending around obstruction is necessary.
If soft copper must be used, care must be taken to avoid
sharp bends which may cause a restriction.
2. The lines should be installed so that they will not obstruct
service access to the coil, air handling system or filter.
3. Care must also be taken to isolate the refrigerant lines to
minimize noise transmission from the equipment to the
structure.
4. The vapor line must be insulated with a minimum of 1/2"
foam rubber insulation (Arm-A-Flex or equivalent). Liquid
lines that will be exposed to direct sunlight and/or high
temperatures must also be insulated.
Tape and suspend the refrigerant lines as shown. DO NOT
allow metal-to metal contact. See Figure 3.
5. Use PVC piping as a conduit for all underground installa-
tions as shown in Figure 4. Buried lines should be kept
as short as possible to minimize the build up of liquid
refrigerant in the vapor line during long periods of shut-
down.
6. Pack fiberglass insulation and a sealing material such as
permagum, around refrigerant lines where they pene-
trate a wall to reduce vibration and to retain some flexibil-
ity.
7. See Form 690.01-AD1V for additional piping information.
Dry nitrogen should always be supplied through the
tubing while it is being brazed, because the tempera-
ture required is high enough to cause oxidation of the
copper unless an inert atmosphere is provided. The
flow of dry nitrogen should continue until the joint has
cooled. Always use a pressure regulator and safety
valve to insure that only low pressure dry nitrogen is
introduced into the tubing. Only a small flow is nec-
essary to displace air and prevent oxidation.
In all cases, mount the TXV bulb after vapor line is
brazed and has had sufficient time to cool.
FIGURE 3 : Insulation of Vapor Line
FIGURE 4 : Underground Installation
Liquid
Line
Incorrect
Correct Tape
Sheet Metal Hanger
Insulated Vapor Line
TO INDOOR COIL TO OUTDOOR UNIT
LIQUID LINE
CAP
PVC
CONDUIT
INSULATED
VAPOR LINE

035-14511-001 Rev. A (0602)
Unitary Products Group 5
PRECAUTIONS DURING BRAZING OF LINES
All outdoor unit and evaporator coil connections are copper-
to-copper and should be brazed with a phosphorous-copper
alloy material such as Silfos-5 or equivalent. DO NOT use
soft solder.
The outdoor units have reusable service valves on both the
liquid and vapor connections. The total system refrigerant
charge is retained within the outdoor unit during shipping and
installation. The reusable service valves are provided to
evacuate and charge per this instruction.
Serious service problems can be avoided by taking adequate
precautions to assure an internally clean and dry system.
PRECAUTIONS DURING BRAZING ANGLE VALVE
Precautions should be taken to prevent heat damage to angle
valve by wrapping a wet rag around it as shown in Figure 5.
Also, protect all painted surfaces and insulation during braz-
ing. After brazing, cool joint with wet rag.
Valve can be opened by removing the plunger cap and fully
inserting a hex wrench into the stem and backing out counter-
clockwise until valve stem just touches retaining ring.
Replace plunger cap finger tight, then tighten an additional 1/
12 turn (1/2 hex flat). Cap must be replaced to prevent leaks.
Connect the refrigerant lines using the following procedure.
1. Remove the cap and Schrader core from both the liquid
and vapor angle valve service ports at the outdoor unit.
Connect low pressure nitrogen to the liquid line service
port.
2. Braze the liquid line to the liquid valve at the outdoor unit.
Be sure to wrap the valve body with a wet rag. Allow the
nitrogen to continue flowing.
3. Carefully remove the brazed plugs from the evaporator
liquid and vapor connections after relieving the pressure
in the evaporator.
4. Braze the liquid line to the evaporator liquid connection.
The nitrogen should now be flowing through the evapo-
rator coil.
5. Slide the grommet away from the vapor connection at
the coil. Braze the vapor line to the evaporator vapor
connection. After the connection has cooled, slide the
grommet back into original position.
6. Protect the vapor valve of the outdoor unit with a wet rag
and braze the vapor line connection. The nitrogen flow
should be exiting the system from the vapor service port
connection. After this connection has cooled, remove the
nitrogen source from the liquid fitting service port.
7. Replace the Schrader cores in the liquid and vapor
valves.
8. Evacuate the vapor line, evaporator and the liquid line, to
500 microns or less.
9. Leak test all refrigerant piping connections including the
service port flare caps to be sure they are leak tight. DO
NOT OVERTIGHTEN (between 40 and 60 inch - lbs.
maximum).
Dry nitrogen should always be supplied through the
tubing while it is being brazed, because the tempera-
ture required is high enough to cause oxidation of the
copper unless an inert atmosphere is provided. The
flow of dry nitrogen should continue until the joint has
cooled. Always use a pressure regulator and safety
valve to insure that only low pressure dry nitrogen is
introduced into the tubing. Only a small flow is nec-
essary to displace air and prevent oxidation.
This is not a backseating valve. The service access
port has a valve core. Opening or closing valve does
not close service access port.
If the valve stem is backed out past the retaining
ring, the O-ring can be damaged causing leakage or
system pressure could force the valve stem out of
the valve body possibly causing personal injury. In
the event the retaining ring is missing, do not attempt
to open the valve.
FIGURE 5 : Heat Protection
If visual verification of the valve stem reaching the
retaining ring is impossible, stop backing out the
valve stem when the slightest increase in resistance
is felt. Because of the small size and therefore the
reduced resistance, back out the liquid valve 5 turns
maximum to prevent going past the retaining ring.
The evaporator is pressurized.

035-14511-001 Rev. A (0602)
6Unitary Products Group
NOTE: Do not use the system refrigerant in the outdoor unit
to purge or leak test.
10. Replace caps on service ports. Do not remove the flare
caps from the service ports except when necessary for
servicing the system.
11. Release the refrigerant charge into the system. Open
both the liquid and vapor valves by removing the plunger
cap and with an allen wrench back out counter-clockwise
until valve stem just touches retaining ring. Release the
refrigerant charge into the system. See “PRECAUTIONS
DURING BRAZING ANGLE VALVE” on Page 6.
Replace plunger cap finger tight, then tighten an additional 1/
12 turn (1/2 hex flat). Cap must be replaced to prevent leaks.
If a leak is suspected, leak test to locate the leak. To verify
the leak, close the valve to the vacuum pump suction to iso-
late the pump and hold the system under vacuum. If the
micron gauge indicates a steady and continuous rise after a
few minutes, it's an indication of a leak. If the gauge shows a
rise, then levels off after a few minutes and remains fairly
constant, it is an indication that the system is leak free, but
still contains moisture and may require further evacuation if
the reading is above 1000 microns.
12. If the refrigerant tubing, indoor evaporator coil or outdoor
condensing unit has developed a leak during shipment,
or was, for any other reason, opened to the atmosphere
for more than four (4) minutes, it is necessary to evacu-
ate the system down to at least 500 microns to eliminate
contamination and moisture in the system.
See “SYSTEM START-UP” for checking and recording
system charge.
ELECTRICAL CONNECTIONS
GENERAL INFORMATION & GROUNDING
Check the electrical supply to be sure that it meets the values
specified on the unit nameplate and wiring label.
Power wiring, control (low voltage) wiring, disconnect
switches and over current protection to be supplied by the
installer. Wire size should be sized per NEC requirements.
The complete connection diagram and schematic wiring label
is located on the inside surface of the unit electrical box cover
and this instruction.
POWER WIRING
1. Install the proper size weatherproof disconnect switch
outdoors and within sight of the unit.
2. Run power wiring from the disconnect switch to the unit.
3. Remove the control box cover to gain access to the unit
wiring. Route wires from disconnect through power wir-
ing opening provided and into the unit control box as
shown in Figure 6.
4. Install the proper size time-delay fuses or circuit breaker,
and make the power supply connections.
5. Energize the crankcase heater to save time by preheat-
ing the compressor oil while the remaining installation is
completed.
ACCESSORY WIRING
The electrical accessories available for this unit are a two
stage cooling thermostat and an optional dehumidification
control. Refer to the individual instructions packaged with the
accessories for installation.
Do not connect manifold gauges unless trouble is
suspected. Approximately 3/4 ounce of refrigerant
will be lost each time a standard manifold gauge is
connected.
Never attempt to repair any brazed connections
while the system is under pressure. Personal injury
could result.
All field wiring must USE COPPER CONDUCTORS
ONLY and be in accordance with Local, National
Fire, Safety & Electrical Codes. This unit must be
grounded with a separate ground wire in accordance
with the above codes.
FIGURE 6 : Typical Field Wiring
CONTROL
WIRING
LOW VOLTAGE
JUNCTION BOX
POWER
WIRING
GROUND
LUG
ALL OUTDOOR WIRING MUST BE WEATHERPROOF.
USE COPPER CONDUCTORS ONLY.

035-14511-001 Rev. A (0602)
Unitary Products Group 7
THERMOSTAT MOUNTING / WIRING
This condensing unit must be installed with the factory rec-
ommended thermostat. See current Technical Specification
Guide for additional information.
The thermostat should be located about 5 ft. above the floor,
where it will be exposed to normal room air circulation. Do not
place it on an outside wall or where it is exposed to the radi-
ant effect from exposed glass or appliances, drafts from out-
side doors or supply air grilles.
After the thermostat is mounted, route the 24-volt control wir-
ing (NEC Class 2) from the thermostat to the indoor air han-
dler and outdoor unit. Route the control wiring into the
grommeted hole in the bottom of the control box of the out-
door unit. Connect leads as shown in Figures 7-10.
Interconnecting control wiring must be a minimum of No. 18
AWG color coded insulated wires. If total wire length (includ-
ing thermostat, indoor unit, and outdoor unit) increases more
than 90 feet, use No. 16 AWG wires to prevent excessive
voltage drop.
NOTE: To eliminate erratic operation, seal the hole in the
wall at the thermostat with permagum or equivalent to pre-
vent air drafts from affecting the thermostat.
DEHUMIDIFICATION CONTROL
A dehumidification control accessory 2HU16700124 may be
used in high humidity areas. This control provides cooling at
a reduced air flow, lowering evaporator temperature and
increasing latent capacity. The humidistat in this control
opens the humidistat contacts on humidity rise. To install,
refer to instructions packaged with the accessory and Figure
7. Prior to the installation of the dehumidistat control, the
jumper across the HUMIDISTAT terminals on the indoor vari-
able speed air handler or furnace CFM selection board must
be removed.
During first or second stage cooling, if the relative humidity in
the space is higher than the desired set point of the dehumi-
distat control, the variable speed blower motor will operate at
lower speed until the dehumidification control is satisfied. A
40-60% relative humidity level is recommended to achieve
optimum comfort.
NOTE: If a dehumidification control is installed, it is recom-
mended that a minimum air flow of 325 cfm/ton (2-stage
operation) be supplied at all times.
FIELD CONNECTIONS - CONTROL WIRING
The recommended field connections for specific indoor air
handlers and furnaces are shown in Figures 7 through 10. All
connections to the outdoor unit are made in the low voltage
junction box in the bottom left corner of the control box. Feed
all control wiring through the grommet in the bottom of the
box. Care should be taken so that all wire nut connections are
firm with no exposed wires that could short within the box. If
the fault line (X/L) is not connected to the thermostat, it
should be capped securely inside the box.
Variable Speed Air Handlers and Furnaces
Connections are shown in Figure 7. The first stage thermo-
stat signal is connected to Y1 at the air handler/furnace con-
trol. It is critical that the Y2 OUT signal is connected to Y at
the air handler/furnace control to properly control the blower
speed.
Single Speed Air Handlers
Connections are shown in Figure 8. It is mandatory to con-
nect the two speed fan kit (2SF06700124). The first stage
thermostat signal is connected directly to Y1 on the outdoor
unit. Do not connect Y at the indoor control. The first stage
blower operation is controlled by the G signal. It is critical that
the Y2 OUT signal is connected to Y at the air handler to
properly control the blower speed by switching the relay to
the high speed tap.
Single Speed Furnaces
Connections are shown in Figure 9. It is mandatory to con-
nect the appropriate blower relay to operate the low speeds.
The relay should be a SPDT relay with a 24 VAC coil and a
15 AMP rating at 115V. The first stage thermostat signal is
connected directly to Y1 on the outdoor unit. Do not connect
to Y at the indoor control. The first stage blower operation is
controlled by the G signal. It is critical that the Y2 OUT signal
is connected to Y at the furnace control to properly control the
blower speed by switching the relay to the high speed tap.
Two Stage Furnaces
Connections are shown in Figure 10. The first stage thermo-
stat signal is connected directly to Y1 on the outdoor unit. Do
not connect to Y at the indoor control. The first stage blower
operation is controlled by the G signal. It is critical that the Y2
OUT signal is connected to Y at the furnace control to prop-
erly control the blower speed by switching the relay to the
high speed tap.
INDOOR BLOWER SPEED SETTINGS
Refer to the Tabular Data Sheet for the recommended air flow
settings for each size condensing unit.
Variable Speed Air Handlers and Furnaces
For proper system operation the CFM Selection Board jump-
ers must be set properly. See Figure 11.
Set the high speed cooling speed per the instructions for the
air handler or furnace by selecting the correct “COOL” and
“ADJ” taps. The low speed setting will automatically be pro-
grammed for the correct airflow. Verify the airflow by LED dis-
play on the speed selection board.
The HUMIDISTAT jumper must also be removed if a dehumi-
distat is installed.
Single Speed Air Handlers and Furnaces
It is mandatory that a fan relay kit be applied to the furnace or
air handler as described previously. If the low speed air flow
is too high, unsatisfactory dehumidifaction may occur on first
stage operation. To correct for unsatisfactory dehumidifica-
tion, add a dehumidistat per figures 8 or 9.

035-14511-001 Rev. A (0602)
8Unitary Products Group
FIGURE 7 : Wiring: Typical Variable Speed Furnace/
Air Handler
FIGURE 8 : Wiring: N1AH, F2RP/F2FP, F2RC/F2FC
Air Handler and 2-Speed Fan Kit
1
1
2
2
Y1, Y2, X/L & HUM LOCATED ON AIR HANDLER CFM
SELECTION BOARD.
FIELD WIRING
2 STAGE COOL
2 STAGE HEAT
T’STAT
VARIABLE
SPEED
AIR HANDLER OR
FURNACE
TS
CONTROL
C
X/L
Y1
R
W2
W1
G
C
Y1
R
G
PUR
BLK
YEL
RED
BRN
C
Y
R
HUM
HUMIDISTAT CONTACTS OPEN ON HUMIDITY RISE.
HUMIDISTAT JUMPER ON CFM SELECTION BOARD
MUST BE REMOVED.
Y2 Y2
W1
W2
Y1
Y2
X/L
HUMIDISTAT
ORG Y2 OUT
Y2 OUT
WIRE
NUT
1
2 STAGE COOL
2 STAGE HEAT
T’STAT AIR HANDLER TS
CONTROL
C
R
W2
W1
G
C
Y1
R
G
PUR
BLK
YEL
RED
BRN
C
Y
R
DEHUMIDISTAT CONTACTS CLOSE ON HUMIDITY RISE.
Y2
W1
W2
Y1
Y2
X/L
ORG Y2 OUT
Y2 OUT
WIRE
NUT
FAN
L1
2 SPEED
LTRIP
ECM
AIR
HANDLER
CONTROL
AIR
HANDLER
MOTOR
HIGH
LOW
2 SPEED FAN KIT
(2SF06700124)
DEHUMIDISTAT
(Optional) 1
FIELD WIRING
FIGURE 9 : Wiring: Single Stage Non-Variable
Speed Furnace
FIGURE 10 : Wiring: Two-Stage Non-Variable Speed
Furnace
FIGURE 11 : CFM Selection Board
1
2 STAGE COOL
2 STAGE HEAT
T’STAT
SINGLE
STAGE
FURNACE
TS
CONTROL
C
R
W2
W
G
C
Y1
R
G
PUR
BLK
YEL
RED
BRN
C
Y
R
DEHUMIDISTAT CONTACTS CLOSE ON HUMIDITY RISE.
Y2
W1
Y1
Y2
X/L
ORG Y2 OUT
Y2 OUT
WIRE
NUT
FURNACE
MOTOR
HIGH
LOW
SPDT 24 VAC COIL
12 AMP AT 115V
RATED MIN.
COOL
TAP
DEHUMIDISTAT
(Optional)
FIELD WIRING
1
2 STAGE COOL
2 STAGE HEAT
T’STAT
TWO
STAGE
FURNACE
TS
CONTROL
C
R
W2
W!
G
C
Y1
R
G
PUR
BLK
YEL
RED
BRN
C
Y
R
DEHUMIDISTAT CONTACTS CLOSE ON HUMIDITY RISE.
Y2
W1
W2
Y1
Y2
X/L
ORG Y2 OUT
Y2 OUT
WIRE
NUT
DEHUMIDISTAT
(Optional) 1
FIELD WIRING
FURNACE
MOTOR
HIGH
LOW
SPDT 24 VAC COIL
12 AMP AT 115V
RATED MIN.
COOL
TAP
CFM SELECTION BOARD
TAP SELECTION
D
C
B
A
D
C
B
A
COOL HEAT ADJ DELAY
REMOVE FOR
HEAT PUMP HUMIDISTAT

035-14511-001 Rev. A (0602)
Unitary Products Group 9
SYSTEM CHARGE
The factory charge in the outdoor unit includes enough
charge for the unit and the smallest matched coil. Additional
charge may be required.
REFRIGERANT LINE CHARGES
The outdoor condensing unit may be connected to the indoor
evaporator coil using field supplied refrigerant grade copper
tubing that is internally clean and dry. Units should be
installed only with the tubing sizes for approved system com-
binations as specified in Tabular Data Sheet. The charge
given is applicable for total tubing lengths up to 15 feet. See
Application Data Form 690.01-AD1V for installing tubing of
longer lengths and elevation differences.
NOTE: Using a larger than specified line size could result in
oil return problems. Using a line size smaller than specified
will result in loss of capacity and other problems caused by
insufficient refrigerant flow.
Sweat connect units also include sufficient charge for 15 feet
of lines. Table 2 lists the refrigerant line charges.
The “TOTAL SYSTEM CHARGE” must be permanently
stamped on the unit data plate.
Total system charge is determined as follows:
1. Determine outdoor unit charge from tabular data sheet.
2. Determine indoor coil adjustment from tabular data
sheet.
3. Calculate the line charge with the factors in Table 2 for
sweat lines in excess of 15 ft.
NOTE: The line charge over 15 feet should be included on
the data plate and must be added to the system.
4. Total system charge = item 1 + item 2 + item 3.
5. Permanently stamp the unit data plate with the total
amount of refrigerant in the system.
USE THE FOLLOWING CHARGING METHOD WHENEVER
ADDITIONAL REFRIGERANT IS REQUIRED FOR THE
SYSTEM CHARGE.
Measurement Method
A calibrated charging cylinder or accurate weighing device
must be used to add refrigerant. This is the only accurate
charging method for heat pumps in the heat pump mode.
Check flare caps on service ports to be sure they are leak
tight. DO NOT OVERTIGHTEN (between 40 and 60 inch-lbs.
maximum).
Subcooling Charging Method
The H*TS condensing unit must only be used with the match-
ing thermostatic expansion valve kit listed in the Tabular Data
Sheet. The best way to check the system charge is by check-
ing the system subcooling during the second stage of opera-
tion.
SERVICING AND VERIFY
For second stage (2 cylinder) cooling operation, the recom-
mended subcooling for H*TS036 is 14° F and 20° F for all
other models. For first stage (1 cylinder) operation, the rec-
ommended subcooling is 10°F for all models.
1. Set the system running in the second stage cooling (2
cylinder operation) by setting the thermostat at least 6°F
below the room temperature. Short the “TEST” pin to
bypass the 5 minute anti-short cycle timer if necessary.
2. Operate the system for a minimum of 15-20 minutes.
3. Refer to the Tabular Data Sheet for the recommended
airflow and verify this indoor airflow (it should be about
400 SCFM per ton during 2 cylinder operation).
4. Measure the liquid refrigerant pressure P and tempera-
ture T at the service valve.
5. Calculate the saturated liquid temperature ST from Table
2.
6. Subcooling temperature TC = Saturated Temperature
(ST) - Liquid temp (T).
Add charge if the calculated subcooling temperature TC in
Step 6 is lower than the recommended level. Remove and
recover the refrigerant if the subcooling TC is higher than the
recommended level.
Table 1: REFRIGERANT LINE CHARGES
LIQUID OD VAPOR OD R-22 CHARGE OZ./FT.
3/8" 5/8" 0.66
3/8" 3/4" 0.68
3/8" 7/8" 0.70
3/8" 1-1/8" 0.76
Table 2: R-22 SATURATION TEMPERATURE
ST1
1. ST = Saturated Temperature
P2
2. P = Pressure
ST1P2ST1P2
90 168 105 211 120 260
91 171 106 214 121 264
92 174 107 217 122 267
93 177 108 220 123 271
94 179 109 223 124 274
95 182 110 226 125 278
96 185 111 230 126 282
97 188 112 233 127 286
98 190 113 236 128 289
99 193 114 240 129 293
100 196 115 243 130 297
101 199 116 246 131 301
102 202 117 250 132 305
103 205 118 253 133 309
104 208 119 257 134 313
Example: The pressure P and temperature T mea-
sured at the H*TS036 service port is 223° Psig and
95°F. From Table 3, the saturated temperature for 223
Psig is 109°. The subcooling temperature TC = 109°-
95° = 14°F.

035-14511-001 Rev. A (0602)
10 Unitary Products Group
ENERGIZE CRANKCASE HEATER
This unit is equipped with a crankcase heater for the com-
pressor.
A warning label with an adhesive back is supplied in the unit
installation instruction packet. This label should be attached
to the field supplied disconnect switch where it will be easily
seen.
IMPORTANT - An attempt to start the compressor without
at least 8 hours of crankcase heat will damage the compres-
sor.
In order to energize the crankcase heater, set indoor two
stage cooling thermostat to "OFF" position. Close the line
power disconnect to the unit.
SYSTEM OPERATION
FIRST STAGE COOLING
With a call for first stage cooling, the compressor operates
one cylinder. The run winding (R) is connected through con-
tactor A to the capacitor and the start winding (S) is con-
nected to line voltage. The system operates at low discharge
pressure and high suction pressure.
SECOND STAGE OF COOLING
With a call for second stage cooling, the TS control will shut
the compressor off for two seconds then energize relays R1
and R2 on the TS control board. This will de-energize (open)
contactor A and energize (close) contactor B, connecting the
compressor run winding (R) to line voltage and the start wind-
ing (S) to the capacitor. The compressor runs in the reverse
direction with two cylinders compared to the first stage. The
system will operate with two cylinders until both first and sec-
ond stage are satisfied. The Y2OUT signal from the TS con-
trol causes the indoor blower to function at high speed.
If the room thermostat calls for second stage cooling (Y2) on
two consecutive cooling cycles, the next call for cooling for
either first or second stage will energize the unit in second
stage mode. The above mode will be reset to permit start up
on the first stage with only a Y1 call when the second stage
operation cycle runs less than 15 minutes or when 24V to the
TS control board is disconnected.
NOTE: The TS control must have a Y1 and a Y2 call to run
in second stage. A Y2 call without a Y1 call will not cause the
system to operate.
DEHUMIDIFICATION
The product is designed to run longer on first stage than a
regular single speed compressor system. This additional run
time provides for better dehumidification and consistent room
temperatures. However, there may be installation environ-
ments in which the humidity levels are unacceptable. In this
case the addition of a humidity control will resolve these
issues.
A humidistat installed with a variable speed air handler or fur-
nace reduces the airflow of the blower by 15% of the pro-
grammed speed during the dehumidification mode. This
lower airflow reduces the evaporator temperature increasing
the latent capacity. The humidistat for these variable speed
systems opens the humidistat contacts on humidity rise.
They are wired to the control system per Figure 7.
A dehumidistat installed with a single speed or 2-speed air
handler or furnace will force the system into second stage
mode to increase the latent capacity. It is critical that the low
speed blower operation is set as close to the recommended
airflow as possible to limit the number of times the unit will
run second stage for dehumidification purposes. The dehumi-
distats for these systems close the dehumidistat contacts on
humidity rise. They are wired to the control system per Fig-
ures 8 through 10.
ANTI-SHORT CYCLE TIMER
The control has a five minute time delay to prevent the sys-
tem from short cycling after a thermostat off cycle or power
interrupt. This five minute delay is initiated following the com-
pletion of a first stage cooling call (Y1) or the 24v power up of
the control. During this mode the control will not respond to
any thermostat inputs and the LED will flash a code 1 at the
control board.
For servicing or during installation of the condensing unit, the
time delay may be bypassed by momentarily jumping the two
test pins when there is a call for cooling (Y1 or Y2).
PRESSURE SWITCH OPERATION
The condensing unit is provided with high and low pressure
switches installed and wired into the control to provide addi-
tional protection for the system if any abnormal operating
conditions occur. The high pressure switch is threaded on a
Schrader fitting located in the liquid line of the outdoor unit
and a low pressure switch is brazed in the suction line of the
outdoor unit. These two controls are wired in series to the unit
control.
If the pressure switches detect a fault condition, they will
open (high pressure opens with pressures greater than 400
psi and low pressure opens with pressures less than 25 psi)
and the control will immediately shut down the unit. The con-
trol will go into a five-minute anti-short cycle mode inhibiting
any thermostat inputs. Following the anti-short cycle mode,
the control will permit the unit to start normally with the next
call for cooling as long as the pressure switches have reset
(high pressure resets at 300 ± 15 psi, low pressure resets at
65 ± 7 psi).
If the control detects a second pressure switch fault within
one hour of compressor run time, the unit will again shut
down and the unit control will lock out the unit until the fault
condition is reset. During this period, a code “2” will be
flashed at the control and provide a 24v signal on the X/L line.
HeartBeat – LED flash rate of 500 ms ON and 500 ms OFF
Flash/Error Code – LED flash rate of 350 ms ON and 350 ms
OFF for the number of codes and with a pause of 1.5 sec-
onds between flash codes.
Table 3: FAULT CODES
TS Control
LED Description 24V @
X/L line
HeartBeat Normal Operation None
1 Flash Compressor waiting to complete
Anti-short cycle period None
2 Flash Compressor lockout out on safety
chain trip Yes
On Steady Control Failure Yes
Off No power or Control Failure

035-14511-001 Rev. A (0602)
Unitary Products Group 11
RESETTING FAULT CONDITIONS
The control locks out the unit and does not permit it to run
when it detects certain fault conditions. Table 2 lists all the
modes indicated by the control. Control code “1” is a tempo-
rary five-minute lock-out (see Anti-short cycle above). Control
code "2" (pressure switch open) locks out the control and
does not permit the unit to start until the fault condition is cor-
rected. The fault code "2" can be reset by one of the following
three methods.
1. Reset the 24v to the control (remove 24v and then reap-
ply).
2. Jumper the test pins at the control board.
3. If there is a call for Y1 or Y2 cooling, turn the thermostat
to the off position then turn it to cool.
If methods 1 or 3 above are used, then the next call for cool-
ing will allow the unit to start following a five-minute anti-short
cycle period. If method 2 is used, then the unit will start imme-
diately with the next call for cooling.
If the fault condition continues to exist prior to re-starting the
unit, the control will lock out the unit again.
INDICATIONS OF PROPER OPERATION
Cooling operation is the same as any conventional air condi-
tioning unit.
1. The outdoor fan should be running, with warm air being
discharged from the top of the unit.
2. The indoor blower (furnace or air handler) will be operat-
ing, discharging cool air from the ducts, coils or other
parts in the air circuit. Clean as often as necessary to
keep the unit clean. Use a brush, vacuum cleaner attach-
ment, or other suitable means.
3. The vapor line at the outdoor unit will feel cool to the
touch.
4. The liquid line at the outdoor unit will feel warm to the
touch.
NOTICE TO OWNER
If unit is not operating properly, check the following before
calling a service man:
1. Indoor section for dirty filter.
2. Outdoor section for leaf or debris blockage.
Eliminate problem, turn off the thermostat for 10 seconds and
attempt start. Wait 5 minutes. If system does not start, call
serviceman.
MAINTENANCE
1. Dirt should not be allowed to accumulate on the outdoor
coils or other parts in the air circuit. Clean as often as
necessary to keep the unit clean. Use a brush, vacuum
cleaner attachment, or other suitable means.
2. The outdoor fan motor is permanently lubricated and
does not require periodic oiling.
3. If the coil needs to be cleaned, it should be washed with
Calgon CalClean (mix one part CalClean to seven parts
water). Allow solution to remain on coil for 30 minutes
before rinsing with clean water. Solution should not be
permitted to come in contact with painted surfaces.
4. Refer to the furnace or air handler instructions for filter
and blower motor maintenance.
5. The evaporator coil drain pan should be inspected and
cleaned regularly to prevent odors and assure proper
drainage.
WHEN THE SYSTEM IS FUNCTIONING PROPERLY AND
THE OWNER HAS BEEN FULLY INSTRUCTED, SECURE
THE OWNER'S APPROVAL.
It is unlawful to knowingly vent, release or discharge
refrigerant into open air. It is necessary to recover
the refrigerant during any repair or installation of the
system.

Subject to change without notice. Printed in U.S.A. 035-14511-001 Rev. A (0602)
Copyright © by York International Corp. 2002. All rights reserved. Supersedes: 035-14511-000, 550.37-N4Y (999)
Unitary 5005 Norman
Products York OK
Group Drive 73069
WIRING DIAGRAM
FIGURE 12 : Wiring Diagram - Variable Speed Air Handler or Furnace