Installation Operation Maintenance

TTA-SVX02C-EN
18-AC60D8-1
Installation
Operation
Maintenance
Split System Cooling Condensers
7 1/2 - 20 Tons
Models:
(60 Hz)
TTA090A***F
TTA120A***F
TTA120B***E
TTA120C***G
TTA150B***E
TTA180B***F
TTA180C***G
TTA240B***F
(50 Hz)
TTA075AD**F
TTA085AD**F
TTA100AD**F
TTA100BD**E
TTA100CD**G
TTA125BD**E
TTA155BD**F
TTA155CD**G
TTA200BD**F
September 2004
Introduction
Literature Change History
TTA-SVX02C-EN (September 2004)
Page 13. Revised model nomenclature.
TTA-SVX02B-EN (August 2003)
Introduction of ReliatelTM Control Option.
to properly diagnose and repair this
equipment.
NOTICE:
Warnings and Cautions appear at
appropriate sections throughout this
manual. Read these carefully.
TTA-SVX02A-EN (May 2003)
Compressor Change
TTA-SVX02A-EN (January 2004)
Compresssor LRA updated.
Overview of Manual
Note: One copy of this document
ships inside the control panel of
each unit and is customer
property. It must be retained by
the unit’s maintenance personnel.
This booklet describes proper
installation, operation, and maintenance
procedures for air cooled systems. By
carefully reviewing the information within
this manual and following the
instructions, the risk of improper
operation and/or component damage
will be minimized.
It is important that periodic maintenance
be performed to help assure trouble free
operation. A maintenance schedule is
provided at the end of this manual.
Should equipment failure occur, contact
a qualified service organization with
qualified, experienced HVAC technicians
WARNING– Indicates a
potentially hazardous situation
which, if not avoided, could result in
death or serious injury.
CAUTION – Indicates a
potentially hazardous situation
which, if not avoided, may result in
minor or moderate injury. It may also
be used to alert against unsafe
practices.
CAUTION – Indicates a situation
that may result in equipment or
property-damage-only accidents.
IMPORTANT NOTE: All phases of this
installation must comply with the
NATIONAL, STATE & LOCAL CODES. In
addition to local codes, the installation
must conform with National Electric
Code -ANSI/NFPA NO. 70 LATEST
REVISION.
Note: Do Not release refrigerant
to the atmosphere! If adding or
removing refrigerant is required,
the service technician must
comply with all federal, state, and
local laws.
2
TTA-SVX02C-EN
Contents
Model Number Description .......................................................................................... 4
Unit Dimensions .............................................................................................. 5,6,7,8,9
Electrical Data ........................................................................................................... 10
Unit Inspection ........................................................................................................... 11
Initial Leak Test .......................................................................................................... 11
Lifting Recommendations .......................................................................................... 11
Clearances ................................................................................................................. 12
Unit Mounting ............................................................................................................ 12
Refrigerant Piping ...................................................................................................... 12
Leak Check ................................................................................................................ 14
System Evacuation .................................................................................................... 14
Refrigerant Charging Procedure ............................................................................... 14
Electrical Wiring ......................................................................................................... 15
Low Voltage Wiring - Electromechanical ................................................................... 16
Low Voltage Wiring - ReliaTel .................................................................................... 17
ReliaTel thermostat, zone sensor and night setback wiring .................................... 18
Typical Split System Cooling Diagram ...................................................................... 19
Safety Controls .......................................................................................................... 20
Installation Checklist .................................................................................................. 20
Sequence of Operation for Electro Mechanical Control .......................................... 21
Sequence of Operation for ReliaTel Control ............................................................ 22
Service Test Modes for ReliaTel Control ................................................................... 23
Trouble Shooting for ReliaTel Control ........................................................................ 24
Maintenance .............................................................................................................. 27
Warranty ............................................................................................................... 29/30
TTA-SVX02C-EN
3
Model Number Description
Model Number Description
All products are identified by a multiplecharacter model number that precisely
identifies a particular type of unit. An
explanation of the alphanumeric
identification code is provided below. Its
use will enable the owner/operator,
installing contractors, and service
engineers to define the operation,
specific components, and other options
for any specific unit.
When ordering replacement parts or
requesting service, be sure to refer to
the specific model number, serial
number, and DL number (if applicable)
stamped on the unit nameplate.
Split System Condensing Unit Model Nomenclature
TTA
123
090
456
A
7
3
8
00
9 10
Digits 1, 2, 3 - Product Type
TTA = Split System Cooling
Digits 4, 5, 6 - Nominal Gross Cooling Capacity (MBh)
090 =
120 =
150 =
180 =
240 =
90 MBH
120 MBH
150 MBH
180 MBH
240 MBH
Digit 7- Major Development Sequence
A = 1 Refrigerant Circuit
B = 2 Refrigerant Circuits
C = Manifolded Scroll Compressors
B
11
A
12
Digit 8 - Electrical Characteristics
3
4
W
D
K
=
=
=
=
=
208-230/60/3
460/60/3
575/60/3
380-415/50/3
380/60/3
Digit 9, 10 - Factory - Installed Options
00
0S
0R
0T
0U
0W
=
=
=
=
=
=
Packed Stock
Black Epoxy coated coil
ReliaTel™, no LCI board
ReliaTel™, no LCI board with Black Epoxy coated coil
ReliaTel™, with LCI board
ReliaTel™, with LCI board and Black Epoxy coated coil
Digit 11- Minor Design Sequence
B = Second
Digit 12- Service Digit
A = First
4
TTA-SVX02C-EN
Unit Dimensions
Figure 1 - TTA075A , TTA090A
Dimensional Data, Connection Location, Clearances, Corner Weights
Figure 2 - TTA085A, TTA100A, TTA120A
Dimensional Data, Connection Location, Clearances, Corner Weights
TTA-SVX02C-EN
5
Unit Dimensions
Figure 3 - TTA100B, TTA120B, TTA125B, TTA150B
Dimensional Data, Connection Location, Clearances, Corner Weights
Figure 4 - TTA100C, TTA120C
Dimensional Data, Connection Location, Clearances, Corner Weights
6
TTA-SVX02C-EN
Unit Dimensions
Figure 5 - TTA155B, TTA180B
Dimensional Data, Connection Location, Clearances, Corner Weights
TTA-SVX02C-EN
7
Unit Dimensions
Figure 6 - TTA155C, TTA180C
Dimensional Data, Connection Location, Clearances, Corner Weights
8
TTA-SVX02C-EN
Unit Dimensions
Figure 7 - TTA200B, TTA240B
Dimensional Data, Connection Location, Clearances, Corner Weights
TTA-SVX02C-EN
9
Electrical Data
Table 3 - TTA Unit Electrical Data
Model
Number
TTA090A3
TTA090A4
TTA090AK
TTA090AW
TTA075AD
TTA085AD
TTA120A3
TTA120A4
TTA120AK
TTA120AW
TTA100AD
TTA120B3
TTA120B4
TTA120BK
TTA120BW
TTA100BD
TTA150B3
TTA150B4
TTA150BK
TTA150BW
TTA125BD
TTA180B3
TTA180B4
TTA180BK
TTA180BW
TTA155BD
TTA240B3
TTA240B4
TTA240BK
TTA240BW
TTA200BD
TTA120C3
TTA120C4
TTA120CW
TTA120CD
TTA180C3
TTA180C4
TTA180CW
TTA155CD
10
Basic Unit Characteristics
Allowable Minimum Maximum
Electrical
Voltage
Circuit
Fuse
Characteristics Range
Ampacity
Size
208-230/60/3
187-254
34.5
50
460/60/3
414-506
18.1
25
380/60/3
342-418
21.0
30
575/60/3
518-632
14.5
20
380-415/50/3
380-415
15.6
25
380-415/50/3
380-415
19.1
25
208-230/60/3
187-254
48.1
70
460/60/3
414-506
23.3
35
380/60/3
342-418
26.0
40
575/60/3
518-632
18.8
25
380-415/50/3
380-415
22.5
35
208-230/60/3
187-254
47.9
60
460/60/3
414-506
23.9
30
380/60/3
342-418
27.5
35
575/60/3
518-632
19.1
25
380-415/50/3
380-415
23.9
30
208-230/60/3
187-254
55.5
70
460/60/3
414-506
25.2
35
380/60/3
342-418
27.5
35
575/60/3
518-632
20.5
25
380-415/50/3
380-415
25.2
35
208-230/60/3
187-254
62.7
80
460/60/3
414-506
32.9
45
380/60/3
342-418
38.2
50
575/60/3
518-632
26.3
35
380-415/50/3
380-415
28.4
35
208-230/60/3
187-254
87.8
100
460/60/3
414-506
42.5
50
380/60/3
342-418
47.5
60
575/60/3
518-632
34.2
45
380-415/50/3
380-415
41.0
50
208-230/60/3
187-254
49.4
60
460/60/3
414-506
25.2
30
575/60/3
518-632
19.8
25
380-415/50/3
380-415
24.4
30
208-230/60/3
187-254
62.7
80
460/60/3
414-506
32.9
45
575/60/3
518-632
26.3
35
380-415/50/3
380-415
28.4
35
Compressor Motor
Qty.
1
1
1
1
1
1
1
1
1
1
1
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
Outdoor Fan Motor
Amps
RLA LRA Qty. HP
25.1 182.0
1 1/2
13.2 94.9
1 1/2
15.0 106.3
1
1
10.6 70.0
1 1/2
11.2 94.9
1 1/2
13.1 100.0
1
1
33.7 278.0
1
1
16.5 124.0
1
1
18.1 137.0
1
1
13.4 92.0
1
1
15.8 124.0
1
1
18.6 128.0
1
1
9.4 63.0
1
1
10.7 64.0
1
1
7.6 49.0
1
1
9.4 63.0
1
1
22.0 156.0
1
1
10.0 70.0
1
1
10.7 70.0
1
1
8.2 54.0
1
1
10.0 70.0
1
1
25.1 182.0
2 1/2
13.2 94.9
2 1/2
15.0 106.3
2
1
10.6 70.0
2 1/2
11.2 94.9
2 1/2
33.7 278.0
2
1
16.5 124.0
2
1
18.1 137.0
2
1
13.4 92.0
2
1
15.8 124.0
2
1
17.7 123.0
1
1
9.0 62.0
1
1
7.9 50.0
1
1
10.0 58.0
1
1
25.1 182.0
2 1/2
13.2 94.9
2 1/2
10.6 70.0
2 1/2
11.2 94.9
2 1/2
Amps
FLA
LRA
3.1
8.1
1.6
3.7
2.2
5.8
1.2
3.0
1.6
4.0
2.7
9.3
6.0
17.0
2.7
7.0
3.4
7.8
2.0
5.7
2.7
9.3
6.0
17.0
2.7
7.0
3.4
7.8
2.0
5.7
2.7
9.3
6.0
17.0
2.7
7.0
3.4
7.8
2.0
5.7
2.7
9.3
3.1
8.1
1.6
3.7
2.2
5.8
1.2
3.0
1.6
4.0
6.0
17.0
2.7
7.0
3.7
7.8
2.0
5.7
2.7
9.3
6.0
17.0
2.7
7.0
2.0
5.7
1.9
5.8
3.1
8.1
1.6
3.8
1.2
3.0
1.6
4.0
TTA-SVX02C-EN
Installation
Installation procedures should be performed in the
sequence that they appear in this manual. Do not destroy or
remove the manual from the unit. The manual should
remain weather-protected with the unit until all installation
procedures are complete.
Note: It is not the intention of this manual to cover all possible
variations in systems that may occur or to provide
comprehensive information concerning every possible
contingency that may be encountered during an installation. If
additional information is required or if specific problems arise
that are not fully discussed in this manual, contact your local
Sales office.
Note: “Warnings” and “Cautions” appear at appropriate
places in this manual. Your personal safety and the proper
operation of this machine require that you follow them
carefully. The Company assumes no liability for installations or
servicing performed by unqualified personnel.
Installation Checklist
An “Installation Checklist” is provided at the end of the
installation section of this manual. Use the checklist to verify
that all necessary installation procedures have been
completed. Do not use the checklist as a substitute for reading
the information contained in the manual. Read the entire
manual before beginning installation procedures.
Unit Inspection
Inspect material carefully for any shipping damage. If
damaged, it must be reported to, and claims made against the
transportation company. Compare the information that
appears on the unit nameplate with ordering and submittal
data to insure the proper unit was shipped. Available power
supply must be compatible with electrical characteristics
specified on component nameplates. Replace damaged parts
with authorized parts only.
Inspection Checklist
To protect against loss due to damage incurred in transit,
complete the following checklist upon receipt of the unit.
[ ] Inspect individual pieces of the shipment before accepting
the unit. Check for obvious damage to the unit or packing
material.
[ ] Inspect the unit for concealed damage before it is stored
and as soon as possible after delivery. Concealed damage
must be reported within 15 days. If concealed damage is
discovered, stop unpacking the shipment. Do not remove
damaged material from the receiving location. Take photos
of the damage if possible. The owner must provide reasonable evidence that the damage did not occur after delivery.
[ ] Notify the carrier’s terminal of damage immediately by
phone and by mail. Request an immediate joint inspection
of the damage by the carrier and the consignee.
[ ] Notify the sales representative and arrange for repair. Do
not repair the unit until the damage is inspected by the
carrier’s representative.
TTA-SVX02C-EN
Initial Leak Test
All TTA units are shipped with a holding charge of nitrogen
in each circuit. Remove the compressor access panel(s)
shown in Figure 1 through Figure 7. Locate the liquid line or
suction line service valve for each circuit. Install gauges to
determine if the circuits are still pressurized. If not, the
charge has escaped. Repair as required to obtain a leak-free
circuit.
Lifting Recommendations
Before preparing the unit for lifting, estimate the approximate
center of gravity for lifting safety. Because of placement of
internal components, the unit weight may be unevenly
distributed. Approximate unit weights are given in Table 4.
Table 4. Total Unit Weight and Corner Weights (lbs)
Shipping
Net
Corner Weights
Model
Maximum Maximum #1
#2
#3
TTA090A
370
326
105 83
61
TTA075A
TTA085A
443
399
149 116 78
TTA120A
TTA100A
TTA120B
481
427
133 135 87
TTA100B
TTA120C
492
437
133 122 87
TTA100C
TTA150B
481
427
133 135 87
TTA125B
TTA180B
764
679
196 193 144
TTA155B
TTA180C
764
679
196 193 144
TTA155C
TTA240B
915
830
247 247 168
TTA200B
#4
77
100
85
95
85
146
146
168
ON-SIGHT LIFTING
EQUIPMENT MUST BE CAPABLE OF LIFTING THE
UNIT WEIGHT WITH AN ADEQUATE SAFETY FACTOR.
THE USE OF UNDER-CAPACITY LIFTING DEVICES
MAY RESULT IN SEVERE PERSONAL INJURY OR
DEATH AND CAN SERIOUSLY DAMAGE THE UNIT
The crated unit can be moved using a forklift of suitable
capacity. For lifting the unit, attach lifting straps or slings
securely to the lifting holes at each corner. Use spreader
bars to protect the unit casing from damage. Test lift the unit to
determine proper balance and stability.
CAUTION: Use spreader bars to prevent lifting straps
from damaging the unit. Install bars between lifting
straps. This will prevent the straps from crushing the
unit cabinet or damaging the unit finish.
11
Installation
Clearances
Provide enough space around the unit to allow unrestricted
access to all service points. Refer to Figure 1 through Figure 7
for unit dimensions and minimum required service and free air
clearances. Observe the following points to insure proper unit
operation.
Ensure that the roof
structure supports are strong enough to support the
weight of the unit and any accessories. Failure to do this
can result in personal injury or death due to structural
failure and can seriously damage the unit and the
building.
A. Do not install the unit under a low overhang. Condenser
discharge must not be restricted. See Notes in Figure 1
through Figure 7.
Important: Do not obstruct condenser discharge air.
This can result in warm air recirculation through the
coil.
B. Do not locate the unit in a position where runoff water can
fall into the fan discharge openings.
C. Condenser intake air is supplied from three sides of the
unit. Adhere to the minimum required clearances given in
Figure 1 through Figure 7.
Unit Mounting
Rooftop Mounting
If the unit will be roof mounted, determine for certain that
the structure is strong enough to support the unit and any
required accessories. Unit weights are given in Table 3.
The unit should be elevated on a level, field fabricated fourinch steel or wood 4" x 4" mounting frame. Complete the frame
and secure it into position before lilfting the unit to the roof.
The mounting frame must support a minimum of three of the
unit’s four sides and should span roof supports to distribute
the load on the roof.
Figure 8 Roof Mounted Unit
The following warning complies with State of California law,
Proposition 65.
This product contains
fiberglass wool insulation! Fiberglass dust and ceramic
fibers are believed by the state of California to cause
cancer through inhalation. Glasswool fibers may also
cause respiratory, skin, or eye irritation. See page 13 for
precautionary and first aid measures.
Ground Level Mounting
“For ground level installation, the unit base should be adequately supported and hold the unit near level. The installation
must meet the guidelines set forth in local codes.” The support
should extend two inches beyond the unit base channels at all
points. The unit and support must be isolated from any
adjacent structure to prevent possible noise or vibration
problems. Any ground level location must comply with required
clearances given in Figure 1 through Figure 7.
Refrigerant Piping
Structural Preparation
Holes must be made in the structure to run refrigerant lines.
For the majority of ground-level installations, the holes can be
made in the header that rests on top of the foundation.
Alternatively, these holes may also be made in the foundation
itself. On roof-mounted units, refrigerant lines should enter the
building as close to the unit as possible; preferably within three
to four inches of the refrigerant connection on the unit, plus a
six-inch (long radius) 90 degree ell entering the building. (See
Figure 8)
Refrigerant Piping Guidelines
A. Maximum recommended line lengths: (per circuit)
Maximum linear length ............................................ 80 Ft.
(w/o accumulator)
Maximum suction line lift ........................................ 60 Ft.
Maximum liquid line lift ............................................ 60 Ft.
B. Maximum allowable pressure drops (R-22):
Suction line ............................................................... 6 psi
Liquid line (without subcooler) ............................... 35 psi
Route refrigerant piping for minimum linear length, mini-mum
number of bends and fittings (no reducers) and
minimum amount of line exposed to outdoor ambients.
12
TTA-SVX02C-EN
Installation
C. Recommended line sizes:
TTA075, 085, 090, 100 & 120A (single circuit)
TTA155B, 180, 200, 240B (dual circuit) and TTA100 &
120C (two speed)
Suction line - 1 3/8 inch sealed type L refrigerant tubing.
Liquid line - 1/2 inch sealed type L refrigerant tubing.
D. Recommended line sizes:
TTA100, TTA120B, TTA125B, TTA150B (dual circuit)
Suction line - 1 1/8 inch sealed type L refrigerant tubing.
Liquid line - 3/8 inch sealed type L refrigerant tubing.
E. Recommended line sizes:
TTA155 and 180C (two speed)
Suction line - 1 5/8 inch sealed type L refrigerant tubing.
Liquid line - 5/8 inch sealed type L refrigerant tubing.
Note: Insulate all refrigerant piping and connections.
Refrigerant Piping Procedures (Outdoor Units)
Each TTA unit ships with a holding charge of dry nitrogen.
The nitrogen should be removed and the entire system
evacuated (at the proper time) to avoid possible
contamination.
1. Remove the compressor service access panel.
2. Locate the liquid and suction line service valves. Check
that the piping connection stubs on the valves (Figure 9)
line up properly with the holes in the unit cabinet.
CAUTION: Do not remove the seal caps from refrigerant
connections until prepared to braze refrigerant lines to the
connections. Excessive exposure to atmosphere may
allow moisture or dirt to contaminate the system,
damaging valve seals and causing ice formation in
system components.
4. Cut, fit and braze tubing, starting at the outdoor unit and
work toward the indoor unit.
Note: Use long radius ells for all 90 degree bends.
All brazing should be done using a 2 to 8 psig dry nitrogen
purge flowing through the pipe being brazed (Figure 9 ).
CAUTION: Install a regulating valve between the nitrogen
source and the gauge manifold (Figure 9). Unregulated
pressure can damage system components.
CAUTION: Wet-wrap all valves and protect painted
surfaces from excessive heat. Heat can damage system
components and the unit finish.
5. Shut off nitrogen supply.
6. Shut off the manifold valve for the line that is connected to
the suction line service valve. Disconnect the line from the
gauge port on the valve.
Figure 10
Figure 9
Refrigerant Piping Procedure (Indoor Unit)
Once liquid and suction lines are complete to the refrigerant
connections on the indoor unit, puncture the seal caps on the
indoor unit connection stubs to release the dry nitrogen
charge.
3. Remove the refrigerant connection seal caps and open the
service valve slowly to release the nitrogen from the unit.
TTA-SVX02C-EN
13
Installation
CAUTION: Do not apply heat to remove seal caps until
they have been punctured. If seal caps are intact,
application of heat may generate excessive pressure in
the unit and result in damage to the coil or expansion
valve.
1. Remove both seal caps from the indoor unit connection
stubs.
CAUTION: Do not remove seal caps until prepared to
braze refrigerant lines to the connections. Extended
exposure to atmosphere may allow moisture or dirt to
contaminate the system, damaging valve seats and
causing ice formation in system components.
2. Turn nitrogen supply on. Nitrogen enters thorough liquid
line gauge port.
3. Braze the liquid line connections.
4. Open the gauge port on the suction line and then braze the
suction line to the connection stub. Nitrogen will bleed out
the open gauge port on the suction line.
5. Shut off nitrogen supply.
Leak Check
After the brazing operation of refrigerant lines to both the
outdoor and indoor unit is completed, the field brazed connections must be checked for leaks. Pressurize the system
through the service valve with dry nitrogen to 200 psi. Use
soap bubbles or other leak-checking methods to ensure
that all field joints are leak free. If not, release pressure,
repair and repeat leak test.
7. With vacuum pump and micron gauge blanked off, open
valve on R-22 cylinder and allow refrigerant pressure to
build up to about 40 psig.
8. Close valve on the R-22 supply cylinder. Close valves on
manifold gauge set and remove refrigerant charging hoses
from liquid and gas gauge ports.
9. Leak test the entire system. Using proper procedures and
caution, repair any leaks found and repeat the leak test.
Refrigerant Charging Procedure
If charging by weight, refer to refrigerant charges that are
given in Table 5. If additional refrigerant is needed because
of length of line, calculate the requirement using Table 6.
Charge by weight through the gauge port on the liquid line.
Once the charge enters the system, backseat (open) the
liquid line service valve and disconnect the charging line
and replace the cap on the gauge port.
Insulating and Isolating Refrigerant Lines
Insulate the entire suction line with refrigerant piping insulation. Also insulate any portion of the liquid line exposed to
temperature extremes. Insulate and isolate liquid and suction
lines from each other. Isolate refrigerant lines from the
structure and any duct work.
Note: To prevent possible noise or vibration problems, be
certain to isolate refrigerant lines from the building.
Table 5. - TTA Refrigerant Charge (R-22)*
5. Close off valve to vacuum pump and observe the micron
gauge. If gauge pressure rises above 500 microns in one
(1) minute, then evacuation is incomplete or the system
has a leak.
Model
TTA090A
TTA075A
TTA085A
TTA120A
TTA100A
TTA120B
TTA100B
TTA150B
TTA125B
TTA180B
TTA155B
TTA240B
TTA200B
TTA120C
TTA100C
TTA180C
TTA155C
6. If vacuum gauge does not rise above 500 microns in one
(1) minute, the evacuation should be complete.
*Sufficient operating charge for outdoor unit
and 25 feet of nominally sized refrigerant piping.
System Evacuation
1. After completion of leak check, evacuate the system.
2. Attach appropriate hoses from manifold gauge to gas and
liquid line pressure taps.
Note: Unnecessary switching of hoses can be avoided
and complete evacuation of all lines leading to sealed
system can be accomplished with manifold center hose
and connecting branch hose to a cylinder of R-22 and
vacuum pump.
3. Attach center hose of manifold gauages to vacuum pump.
4. Evacuate the system to hold a 350 micron vacuum.
14
Refrigerant Charge
16 lbs 0.0 ozs
19 lbs 0.0 ozs
10 lbs 8.0 ozs (ea. Ckt.)
11 lbs13.0 ozs (ea. Ckt.)
15 lbs 0.0 ozs (ea. Ckt.)
18 lbs 0.0 ozs (ea. Ckt.)
20 lbs 8.0 ozs
28 lbs 0.0 ozs
TTA-SVX02C-EN
Installation
Table 6. - Additional Required Refrigerant
Tubing Sizes
Additional
Additional
See
Suction Liquid Tubing Length Refrigerant
Note
1 1/8"
3/8"
15 ft.
0 lb 11.5 oz
1
1 1/8"
3/8"
25 ft.
1 lb 3.0 oz
1
1 1/8"
3/8"
32 ft.
1 lb 8.0 oz
1
1 1/8"
3/8"
40 ft.
1 lb 14.0 oz
1
1 3/8"
1/2"
15 ft.
1 lb 4.0 oz
2
1 3/8"
1/2"
25 ft.
2 lb 1.0 oz
2
1 3/8"
1/2"
32 ft.
2 lb 11.0 oz
2
1 3/8"
1/2"
40 ft.
3 lb 1.0 oz
2
1 5/8"
5/8"
15 ft.
1 lb 15.0 oz
3
1 5/8"
5/8"
25 ft.
3 lb 4.5 oz
3
1 5/8"
5/8"
32 ft.
4 lb 3.2 oz
3
1 5/8"
5/8"
40 ft.
5 lb 4.0 oz
3
Notes:
1. Amounts shown are based on .75 ounces of refrigerant
per foot of 1 1/8" and 3/8" lines.
2. Amounts shown are based on 1.33 ounces of refrigerant
per foot of 1 3/8" and 1/2" lines.
3. Amounts shown are based on 2.1 ounces of refrigerant
per foot of 1 5/8" and 5/8" lines.
Note: For tubing over 40 ft. calculate the additional
refrigerant needed, based on notes above.
USE EXTREME CAUTION
WHILE SERVICING THE UNIT WHEN THE CONTROL
BOX ACCESS PANEL IS REMOVED AND POWER IS
APPLIED TO THE UNIT. FAILURE TO OBSERVE ALL
SAFETY PRECAUTIONS COULD RESULT IN SEVERE
PERSONAL INJURY OR DEATH.
!
2. Turn on power to the unit. Allow the system to run for five to
ten minutes to stabilize operating conditions.
3. Measure airflow across the indoor coil. Compare the measurements with the fan performance data in the Data/Submittal or Service Facts. Once proper airflow is established,
observe the suction and head pressure gauges on the
gauge manifold. Pressure reading should fall approximately at the points shown by the pressure curves in Service Facts. Add or remove refrigerant (gas only) as required to obtain correct head and suction pressures.
Check suction line superheat and condenser sub-cooling
to ensure the unit is operating properly.
4. Disconnect all power to the unit.
5. Remove the charging system from the unit and close the
opening in the bottom of the control box with the pivotal
cover before attempting to replace access panel.
6. Replace all panels.
Electrical Wiring
Gaseous Charging
This procedure is accomplished with the unit operating.
Electrical connections must be complete. Do not proceed
until the system is ready to operate.
TTA field wiring consists of providing power supply to the
unit, installing the system indoor thermostat and providing
low voltage system interconnecting wiring. Access to elec
trical connection locations is shown in Figures 1 and 2.
Procedure
1. Connect R-22 drum with gauge manifold to the Schrader
valves (pressure taps) on the compressor discharge and
suction lines (Figure 10).
Unit Power Supply
The installer must provide line voltage circuit(s) to the unit
main power terminals as shown by the unit wiring diagrams in
Service Facts or field wiring. Power supply must include a
disconnect switch in a location convenient to the unit. Ground
the unit according to local codes and provide flexible conduit if
codes require and/or if vibration transmission may cause noise
problems.
Note: On the TTA075A, 090A, 100A, 100B, 100C, 120A,
120B and 120C, the compressor access panel must be
installed when the unit is running and being charged. The
control box access panel must be removed, and the
manifold hoses must be routed through an opening
located in the bottom front of the control box. The opening
has a pivoted cover plate.
Note: On the TTA125B, 150B, 155B, 180B, 155C, 180C,
200B and 240B, there is a 1 1/2" diameter refrigerant
gauge access hole(s) with a removable silver cap located
adjacent to the refrigerant line openings.
TTA-SVX02C-EN
Important: All wiring must comply with applicable local
and national (NEC) codes. Type and location of
disconnect switches must comply with all applicable
codes.
CAUTION: Use copper conductors only. Unit terminals
are not designed for use with aluminum conductors. Use
of improper wiring materials can result in equipment
damage.
15
Installation
Figure 6
Typical Field Wiring - Electromechanical Control
OPEN THE ELECTRICAL
DIS-CONNECT SWITCH AND LOCK IN OPEN
POSITION TO PREVENT ACCIDENTAL POWER
APPLICATION. FAILURE TO DO SO MAY RESULT IN
PERSONAL INJURY OR DEATH DUE TO ELECTRICAL
SHOCK.
Determine proper wire sizes and unit protective fusing
requirements by referring to the unit nameplate and/or the
unit Service Facts. Field wiring diagrams for accessories
are shipped with the accessory.
Low Voltage Wiring
Mount the indoor thermostat in accordance with the
thermostat installation instructions. Install color-coded,
weather-proof, multi-wire cable according to the
Interconnecting Wiring diagrams in the Air Handler IOM.
TTA090A/TWE090A
TTA150B/TWE180B
TTA120A/TWE120A
TTA180B/TWE180B
TTA120C/TWE120A
TTA240B/TWE240B
FIELD WIRING:
TTA180C/TWE180B
A-- 3 POWER WIRES, LINE VOLTAGE
FIELD WIRING:
B-- 3 POWER WIRES, LINE VOLTAGE FOR 3 PHASE;
2 WIRES FOR SINGLE PHASE
C-- COOLING ONLY THERMOSTAT: 3 WIRES, 24 VOLTS***
-- DIGITAL THERMOSTATS: ADD 1 ADDITIONAL WIRE, 24 VOLT COMMON
A-- 3 POWER WIRES, LINE VOLTAGE
B-- 3 POWER WIRES, LINE VOLTAGE FOR 3 PHASE;
2 WIRES FOR SINGLE PHASE
C-- COOLING ONLY THERMOSTAT: 3 WIRES, 24 VOLTS***
-- ONE STAGE ELECTRIC HEAT: ADD 1 ADDITIONAL WIRE, 24 VOLTS
-- ONE STAGE ELECTRIC HEAT: ADD 1 ADDITIONAL WIRE, 24 VOLTS
-- TWO STAGE ELECTRIC HEAT: ADD 2 ADDITIONAL WIRES, 24 VOLTS
-- TWO STAGE ELECTRIC HEAT: ADD 2 ADDITIONAL WIRES, 24 VOLTS
D-- ADD 4 WIRES, 24 VOLTS
D-- ADD 5 WIRES, 24 VOLTS
-- ONE STAGE ELECTRIC HEAT: ADD 1 ADDITIONAL WIRE, 24 VOLTS
-- TWO STAGE ELECTRIC HEAT: ADD 2 ADDITIONAL WIRES, 24 VOLTS
TTA120B/TWE120B
(2) TTA090A/TWE180B
FIELD WIRING:
(2) TTA120A/TWE240B
A-- 3 POWER WIRES, LINE VOLTAGE
FIELD WIRING:
B-- 3 POWER WIRES, LINE VOLTAGE FOR 3 PHASE;
2 WIRES FOR SINGLE PHASE
C-- COOLING ONLY THERMOSTAT: 4 WIRES, 24 VOLTS***
-- ONE STAGE ELECTRIC HEAT: ADD 1 ADDITIONAL WIRE, 24 VOLTS
-- TWO STAGE ELECTRIC HEAT: ADD 2 ADDITIONAL WIRES, 24 VOLTS
D-- ADD 5 WIRES, 24 VOLTS
A-- 3 POWER WIRES, LINE VOLTAGE
B-- 3 POWER WIRES, LINE VOLTAGE FOR 3 PHASE;
2 WIRES FOR SINGLE PHASE
C-- COOLING ONLY THERMOSTAT: 4 WIRES, 24 VOLTS***
-- ONE STAGE ELECTRIC HEAT: ADD 1 ADDITIONAL WIRE, 24 VOLTS
-- TWO STAGE ELECTRIC HEAT: ADD 2 ADDITIONAL WIRES, 24 VOLTS
D-- ADD 6 WIRES, 24 VOLTS
Notes:
1. WIRING SHOWN WITH DASHED LINES IS TO BE FURNISHED AND INSTALLED
BY THE CUSTOMER. ALL CUSTOMER SUPPLIED WIRING MUST BE COPPER
ONLY AND MUST CONFORM TO NEC AND LOCAL ELECTRICAL CODES.
CODES MAY REQUIRE LINE OF SIGHT BETWEEN DISCONNECT SWITCH
AND UNIT.
2. WHEN ELECTRIC HEATER ACCESSORY IS USED SINGLE POINT POWER
ENTRY OR DUAL POINT POWER ENTRY IS FIELD OPTIONAL, SINCE
POINT POWER ENTRY OPTION IS THROUGH ELECTRIC HEATER ONLY.
16
TTA-SVX02C-EN
Installation
Figure 7
Typical Field Wiring - Reliatel Control
TTA090A/TWE090A
TTA150A/TWE180A
TTA120A/TWE120A
TTA120A/TWE120A
FIELD WIRING:
TTA240B/TWE240B
A-- 3 POWER WIRES, LINE VOLTAGE
TTA180C/TWE180B
B-- 3 POWER WIRES, LINE VOLTAGE FOR 3 PHASE;
2 WIRES FOR SINGLE PHASE
C-- COOLING ONLY THERMOSTAT: 3 WIRES, 24 VOLTS***
-- DIGITAL THERMOSTATS: ADD 1 ADDITIONAL WIRE, 24 VOLT COMMON
-- ONE STAGE ELECTRIC HEAT: ADD 1 ADDITIONAL WIRE, 24 VOLTS
-- TWO STAGE ELECTRIC HEAT: ADD 2 ADDITIONAL WIRES, 24 VOLTS
D-- ADD 4 WIRES, 24 VOLTS
-- ONE STAGE ELECTRIC HEAT: ADD 1 ADDITIONAL WIRE, 24 VOLTS
-- TWO STAGE ELECTRIC HEAT: ADD 2 ADDITIONAL WIRES, 24 VOLTS
E-- ZONE SENSOR: 2 WIRES MINIMUM OR 10 WIRES MAXIMUM, 24 VOLTS***
(# OF WIRES ARE DEPENDENT UPON ZONE SENSOR SELECTION)
FIELD WIRING:
A-- 3 POWER WIRES, LINE VOLTAGE
B-- 3 POWER WIRES, LINE VOLTAGE FOR 3 PHASE;
2 WIRES FOR SINGLE PHASE
C-- COOLING ONLY THERMOSTAT: 3 WIRES, 24 VOLTS***
-- DIGITAL THERMOSTATS: ADD 1 ADDITIONAL WIRE, 24 VOLT COMMON
-- ONE STAGE ELECTRIC HEAT: ADD 1 ADDITIONAL WIRE, 24 VOLTS
-- TWO STAGE ELECTRIC HEAT: ADD 2 ADDITIONAL WIRES, 24 VOLTS
D-- ADD 4 WIRES, 24 VOLTS
-- ONE STAGE ELECTRIC HEAT: ADD 1 ADDITIONAL WIRE, 24 VOLTS
-- TWO STAGE ELECTRIC HEAT: ADD 2 ADDITIONAL WIRES, 24 VOLTS
F-- NSB PANEL: 8 WIRES, 24 VOLTS***
E-- ZONE SENSOR: 2 WIRES MINIMUM OR 10 WIRES MAXIMUM, 24 VOLTS***
TTA120B & 100B/TWE120B & 100B
F-- NSB PANEL: 8 WIRES, 24 VOLTS***
(# OF WIRES ARE DEPENDENT UPON ZONE SENSOR SELECTION)
TTA120C/TWE120A
FIELD WIRING:
(2) TTA090A/TWE180B
A-- 3 POWER WIRES, LINE VOLTAGE
(2) TTA120A/TWE240B
B-- 3 POWER WIRES, LINE VOLTAGE FOR 3 PHASE;
2 WIRES FOR SINGLE PHASE
C-- COOLING ONLY THERMOSTAT: 4 WIRES, 24 VOLTS***
-- DIGITAL THERMOSTATS: ADD 1 ADDITIONAL WIRE, 24 VOLT COMMON
-- ONE STAGE ELECTRIC HEAT: ADD 1 ADDITIONAL WIRE, 24 VOLTS
-- TWO STAGE ELECTRIC HEAT: ADD 2 ADDITIONAL WIRES, 24 VOLTS
D-- ADD 4 WIRES, 24 VOLTS
-- ONE STAGE ELECTRIC HEAT: ADD 1 ADDITIONAL WIRE, 24 VOLTS
-- TWO STAGE ELECTRIC HEAT: ADD 2 ADDITIONAL WIRES, 24 VOLTS
E-- ZONE SENSOR: 2 WIRES MINIMUM OR 10 WIRES MAXIMUM, 24 VOLTS***
(# OF WIRES ARE DEPENDENT UPON ZONE SENSOR SELECTION)
F-- NSB PANEL: 8 WIRES, 24 VOLTS***
FIELD WIRING:
A-- 3 POWER WIRES, LINE VOLTAGE
B-- 3 POWER WIRES, LINE VOLTAGE FOR 3 PHASE;
2 WIRES FOR SINGLE PHASE
C-- COOLING ONLY THERMOSTAT: 6 WIRES, 24 VOLTS***
-- DIGITAL THERMOSTATS: ADD 2 ADDITIONAL WIRES, 24 VOLT COMMON
-- ONE STAGE ELECTRIC HEAT: ADD 1 ADDITIONAL WIRE, 24 VOLTS
-- TWO STAGE ELECTRIC HEAT: ADD 2 ADDITIONAL WIRES, 24 VOLTS
D-- ADD 8 WIRES, 24 VOLTS
-- ONE STAGE ELECTRIC HEAT: ADD 1 ADDITIONAL WIRE, 24 VOLTS
-- TWO STAGE ELECTRIC HEAT: ADD 2 ADDITIONAL WIRES, 24 VOLTS
E-- ZONE SENSOR: 2 WIRES MINIMUM OR 10 WIRES MAXIMUM, 24 VOLTS***
(# OF WIRES ARE DEPENDENT UPON ZONE SENSOR SELECTION)
F-- NSB PANEL: 8 WIRES, 24 VOLTS***
Notes:
1. WIRING SHOWN WITH DASHED LINES IS TO BE FURNISHED AND INSTALLED
BY THE CUSTOMER. ALL CUSTOMER SUPPLIED WIRING MUST BE COPPER
ONLY AND MUST CONFORM TO NEC AND LOCAL ELECTRICAL CODES.
CODES MAY REQUIRE LINE OF SIGHT BETWEEN DISCONNECT SWITCH
AND UNIT.
2. WHEN ELECTRIC HEATER ACCESSORY IS USED SINGLE POINT POWER
ENTRY OR DUAL POINT POWER ENTRY IS FIELD OPTIONAL, SINCE
POINT POWER ENTRY OPTION IS THROUGH ELECTRIC HEATER ONLY.
***NOTE: CHOOSE ONLY 1 OF THE FOLLOWING; THERMOSTAT,
ZONE SENSOR, OR NSB PANEL
TTA-SVX02C-EN
17
Installation
Figure 8 - Night Setback Panel Field Wiring
Figure 9 - Zone Sensor Field Wiring
Figure 10- Thermostat Field Wiring
18
TTA-SVX02C-EN
Installation
Figure 11 - Typical Split System Cooling
TTA-SVX02C-EN
19
System Pre-Start Procedure
Safety Controls
Installation Checklist
Note: All of these controls may not be installed on your unit, check
electrical schematic.
Complete this checklist once the unit is installed to verify
that all recommended procedures have been accomplished
before starting the system. Do not operate the system until all
items covered by this checklist are complete.
Low Outdoor Ambient Cooling
The Evaporator Defrost Control is standard equipment on
Air Handlers and will permit low ambient cooling down to 35
degrees F. For cooling operation down to 0 degrees F, use an
Accessory Head Pressure Control on the outdoor unit.
Evaporator Defrost Control (EDC)
This control is located in the Air Handler of Split Units. The
control’s sensing tube is imbedded vertically in the evaporator
coil, near the center. This device will stop the compressor if the
indoor coil temperature drops below its setting. The indoor air
will still circulate across the coil bringing the temperature of
the coil back up to the cut-in temperature of the evaporator
defrost control.
Low Pressure Cut-Out (LPCO)
This control’s sensor is located in the suction (gas) line, near
the compressor. This control will stop the compressor and the
outdoor fans if suction pressure drops below the Low Pressure
Cut-Out setting. Once the suction pressure has returned to
normal, the compressor and outdoor fans will cycle back on.
High Pressure Cut-Out (HPCO)
This control’s sensor is located in the discharge line. This
device will shut off the compressor and the outdoor fan(s) if
the discharge pressure exceeds the High Pressure Cut-Out’s
setting. Once the discharge pressure has returned to normal,
the compressor will cycle back on.
Internal Overload Protector (IOL)
This device is a current/thermal actuated warp switch,
imbedded in the compressor motor windings. It will shut off
the compressor if the temperature or current of the
compressor windings exceeds its design trip temperature.
[ ] Inspect unit location for proper required service clearances.
[ ] Inspect unit location for proper free air clearances.
[ ] Inspect unit location for secure, level mounting position.
Refrigerant Piping
[ ] Performed initial leak test?
[ ] Connected properly sized and constructed liquid and suction lines to the connection stubs at both the indoor and
outdoor units?
[ ] Insulated the entire suction line?
[ ] Insulated portions of liquid line exposed to extremes in
temperature?
[ ] Evacuated each refrigerant circuit to 350 microns?
[ ] Charged each circuit with proper amount of R-22?
Electrical Wiring
[ ] Provided unit power wiring (with disconnect) to proper terminals in the unit control section?
[ ] Installed system indoor thermostat?
[ ] Installed system low voltage interconnecting wiring to
proper terminals of outdoor unit, indoor unit and system
thermostat?
Note: The IOL will put the compressor back in operation
once the compressor motor heat has dropped below the
trip setting; however, a check of the refrigerant and
electrical systems should be made to determine the
cause and be corrected.
20
TTA-SVX02C-EN
System Start Procedure
Electro Mechanical Controls
Unit Start-Up
Once the unit is properly installed and pre-start procedures
are complete, start the unit by turning the System Switch on
the indoor thermostat to either HEAT, COOL or AUTO. The
system should operate normally.
CAUTION: Ensure the disconnect for the indoor air
handler is closed before operating the system. Operating
the indoor unit without the indoor fan energized, can
cause unit trip-out on high pressure control and/or liquid
flood back to the compressor.
Sequence of Operation
Electro-Mechanical Controls
Unit Model Number Digits 9 and 10 = 00 or 0S
General
Operation of the system cooling (and optional heating) cycles
is controlled by the position of the system switch on the room
thermostat. Once the system switch is placed in either the
HEAT or COOL position, unit operation is automatic. The
optional automatic changeover thermostat, when in the AUTO
position, automatically changes to heat or cool with sufficient
room temperature change.
Cooling Mode
With the disconnect switch in the ON position, current is
supplied to the compressor sump heater(s) and control
transformer. The sump heater(s) supplies heat to the
compressor(s) during the “Off” cycle. The transformer steps
down the line voltage to 24V for the low voltage control circuit.
With the room thermostat system switch is positioned at
COOL and the fan switch is at AUTO, the compressor
contactor energizes on a call for cooling. When the contacts of
the compressor contactor close, operation of the compressor
and condenser fan begins. The evaporator fan contactor also
energizes on a call for cooling and initiates evaporator fan
operation.
On units with dual circuits, the second stage of cooling is
initiated as a result of the 2-stage thermostat calling for
additional cooling.
Evaporator Fan (Indoor Supply Air)
The evaporator fan is controlled by an ON/AUTO switch on
the room thermostat. With the switch positioned at AUTO and
the system operating in the cooling mode, fan operation
coincides with the cooling run cycles. If the system is
equipped with heat and is operating in the heating mode while
the fan switch is at AUTO, fan operation coincides with the
heating run cycles. When the fan switch is positioned at ON,
fan operation is continuous.
TTA-SVX02C-EN
21
System Start Procedure
ReliaTelTM Controls
Unit Start-Up
Once the unit is properly installed and pre-start procedures
are complete, start the unit by turning the System Switch on
the indoor thermostat to either HEAT, COOL or AUTO. The
system should operate normally.
CAUTION: Ensure the disconnect for the indoor air
handler is closed before operating the system. Operating
the indoor unit without the indoor fan energized, can
cause unit trip-out on high pressure control and/or liquid
flood back to the compressor.
Sequence of Operation
ReliaTelTM Control
Unit Model Number Digits 9 and 10 = 0R, 0T, OU or OW
The ReliaTel Controls is a microelectronic control feature,
which provides operating functions that are significantly
different than conventional Electro-mechanical units. The
ReliaTel Refrigeration Module (RTRM) uses Proportional/
Integral control algorithms to perform specific unit functions
that govern the unit operation in response to application
conditions.
The RTRM provides compressor anti-short cycle timing
functions through minimum “Off” and “On” timing to
increase reliability, performance and to maximize unit
efficiency. Upon power initialization, the RTRM performs
self-diagnostic checks to insure that all internal controls are
functioning. It checks the configuration parameters against
the components connected to the system. The Light Port
LED located on the RTRM module is turned “On” within one
second after power-up if all internal operations are okay.
ReliaTel Control Cooling Mode
For Zone Sensor Control:
When the system switch is set to the COOL position and the
zone temperature rises above the cooling setpoint, the
RTRM energizes the compressor relay coil located on the
RTRM. When the compressor relay contacts close, the
compressor contactor coil is energized provided the low and
high pressure controls are closed. When the compressor
contacts close, the compressor and the outdoor fan motor
start to maintain the zone temperature to within ± 2 F of the
sensor setpoint at the sensed location.
On units with dual circuits, the second stage of cooling is
initiated as a result of the Proportional/Integral control
algorithms calling for additional cooling.
For Thermostat Control:
When the room thermostat system switch is positioned at
COOL and the fan switch is at AUTO, the RTRM energizes
22
the compressor relay coil located on the RTRM during a call
for cooling. When the compressor relay contacts close, the
compressor contactor coil is energized provided the low and
high pressure controls are closed. When the contacts of the
compressor contactor close, operation of the compressor and
condenser fan begins. The evaporator fan contactor also
energizes on a call for cooling and initiates evaporator fan
operation.
On units with dual circuits, the second stage of cooling is initiated as
a result of the 2-stage thermostat calling for additional cooling.
Note: Irregular unit operation may occur when the unit is
controlled with a triac-switching thermostat. Please review the
approved thermostat vendor list for all recommended relayswitching thermostats.
ReliaTel Control Evaporator Fan Operation
When the fan selection switch is set to the AUTO position, the
RTRM energizes the evaporator fan relay coil approximately 1
second after energizing the compressor contactor coil in the
cooling mode. In the heating mode, the RTRM energizes the
evaporator fan relay coil approximately 1 second before
energizing the electric heat contactors. The RTRM deenergizes the evaporator fan relay coil approximately 60
seconds after the cooling requirement has been satisfied to
enhance unit efficiency. When the heating cycle is terminated,
the evaporator fan relay coil is de-energized at the same time
as the heater contactors. When the fan selection switch is set
to the ON position, the RTRM keeps the evaporator fan relay
coil energized for continuous fan motor operation.
ReliaTel Control Heating Operation
When the system switch is set to the HEAT position and
heating is required, the RTRM energizes the Heat 1 relay coil.
When the Heat 1 relay contacts close, the first stage electric
heat contactor is energized. If the first stage of electric heat
cannot satisfy the heating requirement, the RTRM energizes
the Heat 2 relay coil. When the Heat 2 relay contacts close,
the second stage electric heat contactor is energized. The first
and second stages of heat are cycled “On” and “Off” as
required to maintain the zone.
Service Test Modes
ReliaTelTM Controls
Test Modes
Upon power initialization, the RTRM performs self-diagnostic
checks to insure that all internal controls are functional. It also
checks the configuration parameters against the components
connected to the system. The Liteport LED located on the
RTRM module is turned “On” within one second of power-up if
internal operation is okay.
There are three methods in which the “Service Test” can
be cycled at LTB-Test 1(T1) and LTB-Test 2 (T2).
Use one of the following “Test” procedures to bypass some
time delays and to start the unit at the control panel. Each step
of unit operation can be activated individually by temporarily
shorting across the “Test” terminals for two to three seconds.
The Liteport LED located on the RTRM module will blink when
the test mode has been initiated. The unit can be left in any
“Test” step for up to one hour before it will automatically
terminate, or it can be terminated by opening the main power
disconnect switch. Once the test mode has been terminated,
the Liteport LED will glow continuously and the unit will revert
to the “System” control.
For the initial start-up of the unit, this method allows the
technician to cycle a component “On” and have up to one
hour to complete the check. Service Test Mode will be
ignored if a short is present across Test 1 and Test 2 at
start-up.
1. Step Test Mode - This method initiates the different components of the unit, one at a time, by temporarily shorting
across the two test terminals for two to three seconds.
2. Resistance Test Mode - This method can be used for
start-up providing a decade box for variable resistance
outputs is available. This method initiates the different
components of the unit, one at a time, when a specific resistance value is placed across the two test terminals. The
unit will remain in the specific test mode for approximately
one hour even though the resistance is left on the test terminals.
3. Auto Test Mode - This method is not recommended for
start-up due to the short timing between individual component steps. This method initiates the different components
of the unit, one at a time, when a fixed jumper is installed
across the test terminals. The unit will start the first test
step and change to the next step every 30 seconds. At the
end of the test mode, control of the unit will automatically
revert to the applied “System” control method. For unit test
steps, test modes, and step resistance values to cycle the
various components, refer to Table 7.
Table 7
Service Test Guide for Component Operation
Test Step Mode
Fan
Comp 1 Comp 2 Heat 1 Heat 2
Ohms
1
Fan
On
Off
Off
Off
Off
2.2KW
2
Cool 1
On
On
Off
Off
Off
4.7KW
(Note 1)
3
Cool 2
On
On
On
Off
Off
6.8KW
(Note 2)
(Note 1) (Note 1)
4
Heat 1
On
Off
Off
On
Off
10KW
(Note 2)
5
Heat 2
On
Off
Off
On
On
15KW
(Note 2)
Notes:
1- The condenser fans will operate any time a compressor is “On” providing
the outdoor air temperature is within the operating values.
2- Steps for optional accessories and non-applicable
modes in unit will be skipped.
23
Trouble Shooting
ReliaTelTM Controls
Trouble Shooting ReliaTel Controls
8. Refer to the individual component test procedures if other microelectronic components are suspect.
The RTRM has the ability to provide the service personnel
with some unit diagnostics and system status information.
System Status Checkout Procedure
Before turning the main power disconnect switch “Off”, follow
the steps below to check the ReliaTel Refrigeration Module
(RTRM). All diagnostics & system status information stored in
the RTRM will be lost when the main power is turned “Off”.
“System Status” is checked by using one of the following two
methods:
HAZARDOUS VOLTAGE!
HIGH VOLTAGE IS PRESENT AT THE TERMINAL BLOCK
OR UNIT MOUNTED DISCONNECT SWITCH.
If the Zone Sensor Module (ZSM) is equipped with a remote
panel with LED status indication, you can check the unit within
the space. If the ZSM does not have LED’s, use Method 2.
BAYSENS010B, BAYSENS011B, BAYSENS019A,
BAYSENS020A, BAYSENS021A & BAYSENS023A all have
the remote panel indication feature. The LED descriptions are
listed below.
To prevent injury or death from electrocution, it is the responsibility of the technician to recognize this hazard and use
extreme care when performing service procedures with the
electrical power energized.
Note: The J6 & J7 screw terminals must be tightened in order
to accurately measure voltage in the required steps.
1. Verify that the Liteport LED on the RTRM is burning continuously. If the LED is lit, go to Step 3.
2. If the LED is not lit, verify that 24 VAC is presence between
J1-1 and J1-2. If 24 VAC is present, proceed to Step 3. If
24 VAC is not present, check the unit main power supply,
check transformer (TNS1). Proceed to Step 3 if necessary.
3. Utilizing “Method 1” or “Method 2” in the “System Status Diagnostic” section, check the following:
System status
Heating status
Cooling status
If a System failure is indicated, proceed to Step 4. If no
failures are indicated, proceed to Step 5.
4. If a System failure is indicated, recheck Steps 1 and 2. If
the LED is not lit in Step 1, and 24 VAC is present in Step
2, then the RTRM has failed. Replace the RTRM.
5. If no failures are indicated, use one of the TEST mode procedures described in the “Unit Start-Up” section to start
the unit. This procedure will allow you to check all of the
RTRM outputs, and all of the external controls (relays,
contactors, etc.) that the RTRM outputs energize, for each
respective mode. Proceed to Step 6.
6. Step the system through all of the available modes, and
verify operation of all outputs, controls, and modes. If a
problem in operation is noted in any mode, you may leave
the system in that mode for up to one hour while troubleshooting. Refer to the sequence of operations for each
mode, to assist in verifying proper operation. Make the
necessary repairs and proceed to Steps 7 and 8.
7. If no abnormal operating conditions appear in the test
mode, exit the test mode by turning the power “Off” at the
main power disconnect switch.
24
Method 1
LED 1 (System)
“On” during normal operation.
“Off” if a system failure occurs or the LED fails.
“Flashing” indicates test mode.
LED 2 (Heat)
“On” when the heat cycle is operating.
“Off” when the heat cycle terminates or the LED fails.
“Flashing” indicates a heating failure.
LED 3 (Cool)
“On” when the cooling cycle is operating.
“Off” when the cooling cycle terminates or the LED fails.
“Flashing” indicates a cooling failure.
Below is the complete listing of failure indication causes.
System Failure
Check the voltage between terminals 6 and 9 on J6, it should read
approximately 32 VDC. If no voltage is present, a System failure has
occurred. Refer to Step 4 in the previous section for the
recommended troubleshooting procedure.
Cooling Failure
1. Cooling and heating set point (slide pot) on the zone sensor has failed. Refer to the “Zone Sensor Test Procedure”
section.
2. Zone temperature thermistor ZTEMP on ZTS failed. Refer
to the “Zone Sensor Test Procedure” section.
3. CC1 or CC2 24 VAC control circuit has opened, check CC1
& CC2 coils, and any of the controls below that apply to
the unit (HPC1, HPC2).
4. LPC1 has opened during the 3 minute minimum “on time”
during 4 consecutive compressor starts, check LPC1 or
LPC2 by testing voltage between the J1-8 & J3-2 terminals
on the RTRM and ground. If 24 VAC is present, the LPCs
have not tripped. If no voltage is present, LPCs have
tripped.
Trouble Shooting
ReliaTelTM Controls
Simultaneous Heat and Cool Failure
1. Emergency Stop is activated.
Method 2
The second method for determining system status is done by
checking voltage readings at the RTRM (J6). The system
indication descriptions and the approximate voltages are listed
below.
System Failure
Measure the voltage between terminals J6-9 & J6-6.
Normal Operation = approximately 32 VDC
System Failure = less than 1 VDC, approximately 0.75 VDC
Test Mode = voltage alternates between 32 VDC & 0.75 VDC
Heat Failure
Measure the voltage between terminals J6-7 & J6-6.
Heat Operating = approximately 32 VDC
Heat Off = less than 1 VDC, approximately 0.75 VDC
Heating Failure = voltage alternates between 32 VDC & 0.75
VDC
Cool Failure
Measure the voltage between terminals J6-8 & J6-6.
Cool Operating = approximately 32 VDC
Cool Off = less than 1 VDC, approximately 0.75 VDC
Cooling Failure = voltage alternates between 32 VDC & 0.75
VDC
To use LED’s for quick status information at the unit, purchase
a BAYSENS010B ZSM and connect wires with alligator
clamps to terminals 6 through 10. Connected each respective
terminal wire (6 through 10) from the Zone Sensor to the unit
J6 terminals 6 through 10.
Note: If the system is equipped with a programmable zone
sensor, (BAYSENS019A, or BAYSENS023A), the LED indicators
will not function while the BAYSENS010A is connected.
Resetting Cooling and Heating Lockouts
Cooling Failures and Heating Lockouts are reset in an identical
manner. Method 1 explains resetting the system from the
space; Method 2 explains resetting the system at the unit.
Note: Before resetting Cooling Failures and Heating Lockouts
check the Failure Status Diagnostics by the methods
previously explained. Diagnostics will be lost when the power
to the unit is disconnected.
Method 1
To reset the system from the space, turn the MODE selection
switch at the zone sensor to the OFF position. After approximately 30 seconds, turn the MODE selection switch to the
desired mode, i.e. HEAT, COOL, or AUTO.
Method 2
To reset the system at the unit, cycle the unit power by turning
the disconnect switch “Off” and then “On”.
Lockouts can be cleared through the building management
system. Refer to the building management system instructions
for more information.
Zone Temperature Sensor (ZTS) Service Indicator
The ZSM SERVICE LED is a generic indicator that will signal
the closing of a Normally Open switch at any time, providing
the Indoor Motor (IDM) is operating. This indicator is usually
used to indicate an airside fan failure.
The RTRM will ignore the closing of this Normally Open switch
for 2 (±1) minutes. This helps prevent nuisance SERVICE LED
indications.
Temperature Tests
Note: These procedures are not for programmable or digital
models and are conducted with the Zone Sensor Module
electrically removed from the system.
Test 1 - Zone Temperature Thermistor (ZTEMP)
This component can be tested by measuring the resistance
between terminals 1 and 2 on the Zone Temperature Sensor.
Below are some typical indoor temperatures, and corresponding resistive values.
Zone Temperature
50°F or 10.0°C
55°F or 12.8°C
60°F or 15.6°C
65°F or 18.3°C
70°F or 21.1°C
75°F or 23.9°C
80°F or 26.7°C
85°F or 29.4°C
90°F or 32.2°C
Nominal Resistance
19.9 Kohms
17.47 Kohms
15.3 Kohms
13.49 Kohms
11.9 Kohms
10.50 Kohms
9.3 Kohms
8.25 Kohms
7.3 Kohms
Test 2 - Cooling Set Point (CSP) and Heating Set Point
(HSP)
Cool SP = Terminals 2 and 3
Range = 100 to 900 Ohms approximate
Heat SP = Terminals 2 and 5
Range = 100 to 900 Ohms approximate
Test 3
System Mode and Fan Selection
The combined resistance of the Mode selection switch and the
Fan selection switch can be measured between terminals 2
and 4 on the Zone Sensor. The possible switch combinations
are listed below with their corresponding resistance values.
25
Trouble Shooting
ReliaTelTM Controls
Test 4 - LED Indicator Test, (SYS ON, HEAT, & COOL)
Programmable & Digital Zone Sensor Test
Method 1
Testing the LED using a meter with diode test function. Test
both forward and reverse bias. Forward bias should measure a
voltage drop of 1.5 to 2.5 volts, depending on your meter.
Reverse bias will show an Over Load, or open circuit indication
if LED is functional.
Testing serial communication voltage
1. Verify 24 VAC is present between terminals J6-14 & J6-11.
Method 2
Testing the LED with an analog Ohmmeter. Connect Ohmmeter across LED in one direction, then reverse the leads for the
opposite direction. The LED should have at least 100 times
more resistance in reverse direction, as compared with the
forward direction. If high resistance in both directions, LED is
open. If low in both directions, LED is shorted.
Method 3
To test LED’s with ZSM connected to unit, test voltages at LED
terminals on ZSM. A measurement of 32 VDC, across an unlit
LED, means the LED has failed.
Note: Measurements should be made from LED common (ZSM
terminal 6 to respective LED terminal). Refer to the Zone
Sensor Module (ZSM) Terminal Identification table at the
beginning of this section.
2. Disconnect wires from J6-11 and J6-12. Measure the voltage between J6-11 and J6-12, should be about 32 VDC.
3. Reconnect wires to terminals J6-11 and J6-12. Measure
voltage again between J6-11 and J6-12, voltage should
flash high and low every 0.5 seconds. The voltage on the
low end will measure about 19 VDC, while the voltage on
the high end will measure from approximately 24 to 38
VDC.
4. Verify all modes of operation, by running the unit through
all of the steps in the “Test Modes” section discussed in
“Unit Start-Up”.
5. After verifying proper unit operation, exit the test mode.
Turn the fan on continuously at the ZSM, by pressing the
button with the fan symbol. If the fan comes on and runs
continuously, the ZSM is good. If you are not able to turn
the fan on, the ZSM is defective.
RTCI Loss of communications
If the RTCI loses input from the building management system,
the RTRM will control in the default mode after approximately
15 minutes. If the RTRM loses the Heating and Cooling
setpoint input, the RTRM will control in the default mode
instantaneously. The temperature sensing thermistor in the
Zone Sensor Module is the only component required for the
“Default Mode” to operate.
26
Maintenance
Maintenance
Perform all of the indicated maintenance procedures at the
intervals scheduled. This will prolong the life of the unit and
reduce the possibility of costly equipment failure.
Monthly
Conduct the following maintenance inspections once per
month.
OPEN AND LOCK UNIT
DISCONNECT TO PREVENT INJURY OR DEATH FROM
ELECTRICAL SHOCK OR CONTACT WITH MOVING
PARTS.
!
Note: Some motors are permanently lubricated.
7. Check refrigerant piping and fittings for leaks.
The following warning complies with State of California law,
Proposition 65.
This product contains
fiberglass wool insulation! Fiberglass dust and ceramic
fibers are believed by the state of California to cause cancer
through inhalation. Glasswool fibers may also cause
respiratory, skin, or eye irritation.
1. Inspect air filters and clean if necessary.
Precautionary Measures
2. Check unit wiring to ensure all connections are tight and
that the wiring insulation is intact.
* Avoid breathing fiberglass dust.
3. Check drain pans and condensate piping to insure they are
free of obstacles.
4. Manually rotate the indoor fan to insure proper operation.
5. Inspect the evaporator and condenser coils for dirt and debris. If the coils appear dirty, clean them.
6. With the unit operating in the cooling mode, check the suction and discharge pressures and compare them with
Pressure Curve values in unit Service Facts. Record these
readings on the “Maintenance Log.”
7. Observe indoor fan operation and correct any unusual or
excessive vibration. Clean blower wheels as needed.
* Use a NIOSH approved dust/mist respirator.
* Avoid contact with the skin or eyes. Wear long-sleeved,
loose-fitting clothing, gloves, and eye protection.
* Wash clothes separately from other clothing: rinse
washer thoroughly.
* Operations such as sawing, blowing, tear-out, and
spraying may generate fiber concentrations requiring
additional respiratory protection. Use the appropriate
NIOSH approved respirator in these situations.
First Aid Measures
Annually (Cooling Season)
The following maintenance procedures must be performed
at the beginning of each cooling season to insure efficient unit
operation.
Eye Contact - Flush eyes with water to remove dust.
If symptoms persist, seek medical attention.
1. Perform all of the monthly maintenance inspections.
Skin Contact - Wash affected areas gently with soap
and warm water after handling.
2. With the unit operating, check unit superheat and record
the reading in the “Maintenance Log.”
3. Remove any accumulation of dust and/or dirt from the unit
casing.
4. Remove corrosion from any surface and repaint. Check the
gasket around the control panel door to insure it fits correctly and is in good condition to prevent water leakage.
5. Inspect the evaporator fan belt. If it is worn or frayed, replace it.
6. Inspect the control panel wiring to insure that all connections are tight and that the insulation is intact.
Lubricate the indoor fan motor bearing with a non detergent
20-weight oil. (To insure good bearing lubrication, condenser
fan motor bearings should be lubricated once every six
months.)
27
Maintenance
Maintenance Log*
Date
Ambient
Temp.
(F)
Evaporator
Entering Air
Dry
Bulb
Wet
Bulb
Compressor
Superheat
Suction Discharge Circuit #1
Pressure Pressure
(F)
Subcooling
Circuit #1
(F)
Perform each inspection once per month (during cooling season) while unit is operating.
28
Warranty
Central Air Conditioner
TTA,TTN,TTP,TTR,TTB,TTX,TTY
and TTZ (Parts Only)
This warranty is extended by American Standard to the original purchaser and to any
succeeding owner of the real property to which the Air Conditioner is originally affixed,
and applies to products purchased and retained for use within the U.S.A. and
Canada.There is no warranty against corrosion, erosion or deterioration.
If any part of your Air Conditioner fails because of a manufacturing defect within one
year from the date of original purchase,Warrantor will furnish without charge the
required replacement part.
In addition, if the sealed motor-compressor(s) fail(s) because of a manufacturing
defect within the second through fifth year from the date of original purchase,
Warrantor will furnish without charge a replacement compressor(s). Warrantor’s
obligations and liabilities under this warranty are limited to furnishing F.O.B.Warrantor
factory or warehouse replacement parts forWarrantor’s products covered under this
warranty. Warrantor shall not be obligated to pay for the cost of lost refrigerant. No
liability shall attach toWarrantor until products have been paid for and then liability
shall be limited solely to the purchase price of the equipment under warranty shown
to be defective.
THE WARRANTY AND LIABILITY SET FORTH HEREIN ARE IN
LIEU OF ALL OTHER WARRANTIES AND LIABILITIES, WHETHER
IN CONTRACT OR IN NEGLIGENCE, EXPRESS OR IMPLIED, IN
LAW OR IN FACT, INCLUDING IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR PARTICULAR USE, AND
IN NO EVENT SHALL WARRANTOR BE LIABLE FOR ANY
INCIDENTAL OR CONSEQUENTIAL DAMAGES.
Some states do not allow limitations on how long an implied warranty lasts or do not
allow the exclusion or limitation of incidental or consequential damages, so the above
limitation or exclusion may not apply to you.This warranty gives you specific legal
rights, and you may also have other rights which vary from state to state.
American Standard Inc.
2701 Wilma Rudolph Blvd.
Clarksville, TN 37040-1008
Attention: Manager, Product Service
TW-338-0597
*This warranty is for commercial usage of said equipment and not applicable when
the equipment is used for a residential application. Commercial use is any application
where the end purchaser uses the product for other than personal, family or
household purposes.
29
Warranty
Commercial Equipment
Rated 20 Tons and Larger and
Related Accessories
(Parts Only)
PRODUCTS COVERED —This warranty is extended by American Standard Inc.,
and applies only to commercial equipment rated 20 tons and larger and related
accessories purchased and retained for use within the U.S.A. and Canada.
Warrantor warrants for a period of 12 months from initial start-up or 18 months from
date of shipment, whichever is less, that the products covered by this warranty (1)
are free from defects in material and manufacture, and (2) have the capacities and
ratings set forth in catalogs and bulletins; provided, that no warranty is made against
corrosion, erosion or deterioration. Warrantor’s obligations and liabilities under this
warranty are limited to furnishing, F.O.B. factory replacement parts (or equipment at
the option ofWarrantor) for allWarrantor’s products not conforming to this warranty.
Warrantor shall not be obligated to pay for the cost of lost refrigerant. No liability
whatever shall attach toWarrantor until said products have been paid for and then
said liability shall be limited to the purchase price of the equipment shown to be
defective.
THE WARRANTY AND LIABILITY SET FORTH HEREIN ARE IN
LIEU OF ALL OTHER WARRANTIES AND LIABILITIES,
WHETHER IN CONTRACT OR IN NEGLIGENCE, EXPRESS OR
IMPLIED, IN LAW OR IN FACT, INCLUDING IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
PARTICULAR USE, AND IN NO EVENT SHALL WARRANTOR BE
LIABLE FOR ANY INCIDENTAL OR CONSEQUENTIAL
DAMAGES.
Some states do not allow limitations on how long an implied warranty lasts or do not
allow the exclusion or limitation of incidental or consequential damages, so the
above limitation or exclusion may not apply to you.This warranty gives you specific
legal rights, and you may also have other rights which vary from state to state.
American Standard Inc.—Warrantor
2701 Wilma Rudolph Blvd.
Clarksville, TN 37040
GW-598-4799
30
31
Literature Order Number
TTA-SVX02C-EN
File Number
SV-UN-TTA-SVX02C-EN 09/04
Supersedes
SV-UN-TTA-SVX02B-EN 02/04
Stocking Location
Webb Mason
The manufacturer has a policy of continuous product and product data improvement and reserves the right to change
design and specifications without notice.
32
TTA-SVX02C-EN
Download PDF
Similar pages