User manual | Service & Installation Manual 04/1994

 48TJ016-028
single Package Rooftop Units
Electric Cooling/Gas Heating
Installation, Start-Up and
Service Instructions
CONTENTS
Page
SAFETY CONSIDERATIONS ................. 1
INSTALLATION ............................ 1-14
Step 1 — Provide Unit Support .............. 1
® ROOF CURB
e ALTERNATE UNIT SUPPORT
Step 2 — Rig and Place Unit ................ 3
® POSITIONING
® ROOF MOUNT
Step 3 — Field Fabricate Ductwork .......... 9
Step 4 — Make Unit Duct Connections ...... 9
Step 5 — Install Flue Hood .................. 9
Step 6 — Trap Condensate Drain ........... 10
Step 7 — Install Gas Piping ................ 10
Step 8 — Make Electrical Connections ...... 11
e FIELD POWER SUPPLY
e FIELD CONTROL WIRING
Step 9 — Make Outdoor-Air Inlet
Adjustments ............................. 13
® MANUAL OUTDOOR-AIR DAMPER
e OPTIONAL ECONOMIZER
Step 10 — Install Outdoor-Air Hood ........ 14
START-UP .......... ii, 14-19
SERVICE ............. i, 19-26
START-UP CHECKLIST ..................... CL-1
SAFETY CONSIDERATIONS
Installation and servicing of air-conditioning equipment
can be hazardous due to system pressure and electrical com-
ponents. Only trained and qualified service personnel should
install, repair, or service air-conditioning equipment.
Untrained personnel can perform the basic maintenance,
functions of cleaning coils and filters and replacing filters.
All other operations should be performed by trained service
personnel. When working on air-conditioning equipment,
observe precautions in the literature, tags and labels at-
tached to the unit, and other safety precautions that may
apply.
Follow all safety codes. Wear safety glasses and work
gloves. Use quenching cloth for unbrazing operations. Have
fire extinguishers available for all brazing operations.
A WARNING
Before performing service or maintenance operations
on unit, turn off main power switch to unit. Electrical
shock could cause personal injury.
A WARNING
1. Improper installation, adjustment, alteration, serv-
ice, or maintenance can cause property damage, per-
sonal injury, or loss of life. Refer to the User's
Information Manual provided with this unit for more
details.
2. Do not store or use gasoline or other flammable va-
pors and liquids in the vicinity of this or any other
appliance.
What to do if you smell gas:
1. DO NOT try to light any appliance.
2. DO NOT touch any electrical switch, or use any
phone in your building.
3. IMMEDIATELY call your gas supplier from a neigh-
bor’s phone. Follow the gas supplier’s instructions.
4. If you cannot reach your gas supplier, call the fire
department.
A WARNING
Disconnect gas piping from unit when pressure testing
at pressure greater than 0.5 psig. Pressures greater than
0.5 psig will cause gas valve damage resulting in haz-
ardous condition. If gas valve is subjected to pressure
greater than 0.5 psig, it must be replaced before use.
When pressure testing field-supplied gas piping at pres-
sures of 0.5 psig or less, a unit connected to such pip-
ing must be isolated by closing the manual gas valve(s).
INSTALLATION
Step 1 — Provide Unit Support
A CAUTION и
When handling 48TJE024 and 028 units with a forklifi
truck, use a minimum of 48-in. long forks and lift
ONLY through factory-provided holes in base rail.
Otherwise, damage to the unit may result.
ROOF CURB — Assemble or install accessory roof curb in
accordance With instructions shipped with this accessory.
See Fig. 1 and 2. Install insulation, cant strips, roofing,
and counter flashing as shown. Ductwork can be installed
to roof curb before unit is set in place. Curb should be level.
This is necessary to permit unit drain to function prop-
erly. Unit leveling tolerance is + V6 in. per linear ft in
any direction. Refer to Accessory Roof Curb Installation
Instructions for additional information as required. When
accessory roof curb is used, unit may be installed on class
A, B, or C roof covering material.
Instructions continued on page 3.
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 564-836
Book |1 PC 111
Tab Ia
Printed in USA
Form 48TJ-7SI Pg 1 4-94 Replaces: 48TJ-2SI
M| TERED CORNERS
(TOP ONLY)
INSULATED PANEL FOR SIDE PLAN VIEW OF ROOF CURB
SUPPLY AND RETURN - —— OUTLINE
(48DP900061, 48DP900071, al La OFUNIT
50DP900211, AND
om
50PQ300151 ONLY) TT TT | + |
° un FROM TABLE | COMPR SUPPLY RETURN | |
M, 5/47 X 4° OPEN ING OPENING | | |
“ag Xe 2 CURB CURB |
° UTA | И 753)
(48DF90008 1. 48DP900071, |
50DP900211, AND |
50PQ900151 ONLY) |
=——
LE (1 133 316
> 1-1 15/18 N KEEP THIS AREA
"E [y (349) NEE ans Ea, VER
1 -3/167 == o—1"-10 3/47
310) (578)
{ CONDE RSE ALL UNITS EXCEPT
( COMPRESSOR (reas = 54 IN CASKET
. } UNIT OPENINGS WITH CURE)
[ y 8 NAIL
\ *-4 5/16"
? CONDENSATE CONDENSER Tard — 17-4 9/16”
DRAIN AND SUPPLY RETURN (421)
COMPRESSOR 28 DEG qu OPTIONAL — — — — > COUNTER FLASHING
+ END À 43 IN a RETURN , (FIELD SUPPL IED
. . — ; Е ИЕ, ROOF ING FELT
? 1 м — 7 fe Lon DUCT- | (FIELD SUPPLIED)
== CANT STRIP
a AIR вето ия SIDE SUPPLY | ЗРРСТЕО ED OF ING. MATER AL
ай A 7 (FIELD SUPPLIED)
SECTION A-A 7
NOTE: To prevent the hazard of stagnant water
build-up in the drain pan of the indoor-air sec- GIO INSULATION
tion, unit can only be pitched as shown.
LEGEND
COMPR SECT. — Compressor Section O
NOTES:
1. Roof curb accessory is shipped unassembied.
2. Insulated panels, %-in. thick neoprene-coated,
2 Ib density.
3. Dimensions in ( ) are in millimeters.
4 2 Direction of airflow.
) 5 Roof curb: 18 gage steel.
a 6. Attach all ductwork to roof curb.
7. Field installation of sidewall is mandatory
© ACCESSORY CURB
PACKAGE HEIGHT DESCRIPTION “A” В’ “up” “Dj” “e”
a NO.
Td 1-2" Standard Curb — 5-76" 1-71%6"
SOPQ900221 (355) 14" High (1703) (503) — — —
a Standard Curb for
4 2-0" Ч 8-76" 1-76"
1 50PQ900141 Units Requiring — — —
» (610) High Installation (1703) (503)
2'-0" Horizontal Supply and 5-716" 17-7196" 5-6” 0'-2%%” 1'-6"
SoPQ900151 (610) Return Curb (1703) (503) (1676) (64) (457)
50DP90021 1 1 1 1 Pre-Assembiled, High-Static, 5'-71 в” 1 -7 % в” 6'-2" 0-64" 1 25"
(584) Horizontal Adapter Curb (1703) (503) (1880) (159) (371)
A 1°-2" Standard Curb — 7'-2196" 3'-3%"
A8DP900041 (355) 14” High (2205) (1006) — - =
Standard Curb
2-0” es 721%" 3°-3%"
48DP900051* for Units Requiring — — —
(610) High Installation (2205) (1006)
2'-0" Horizontal Supply 7'-213hg" 3'-356” 5-6" 0'-21/" 1'-6"
48DP900061* (610) and Return Curb (2205) (1006) (1676) (64) (457)
48DP900071* 1-11” Pre-Assembled, High-Static, 7-21%16" 3-356" 6-2" 0-61" 1-27”
(584) Horizontal Adapter Curb (2205) (1006) (1880) (159) (371)
*For high-heat applications.
Fig. 1 — Roof Curb Details O
EVAPORATOR-FAN
MOTOR 48TJ016
25% VENT AIR/
ECONOMIZER
HOOD
AIR
IN
BLOCK-OFF
PAN
4 1/2"
AIR
OUT
HORIZONTAL SUPPLY
CURB (50PQ900151, 48DP900061,
50DP900211, OR 48DP900071)
EVAPORATOR-FAN
MOTOR 48TJ020-028
-7 —
|
| 1-9 1/2"
!
/
и
Pi
DUCT
NOTE: For preassembled horizontal adapter curb part no. 50DP900211 and
48DP900071, the accessory kit includes a factory-designed, high-static, regain
transition duct. For horizontal adapter curb part no. 50PQ800151 and 48DP900061,
a field-supplied transition duct is required.
Fig. 2 — Horizontal Adapter Curbs
IMPORTANT: The gasketing of the unit to the roof
curb is critical for a watertight seal. Install gasket with
the roof curb as shown in Fig. 1. Improperly applied
gasket can also result in air leaks and poor unit
performance.
ALTERNATE UNIT SUPPORT — When the curb cannot
be used, install unit on a noncombustible surface. Support
unit with sleepers, using unit curb support area. If sleepers
cannot be used, support long sides of unit with a minimum
of 3 equally spaced 4-in. x 4-in. pads on each side.
Step 2 — Rig and Place Unit — Inspect unit for
transportation damage. File any claim with transportation
agency.
Do not drop unit; keep upright. Use spreader bars over
unit to prevent sling or cable damage. Rollers may be used
to move unit across a roof. Level by using unit frame as a
reference; leveling tolerance is + Vie in. per linear ft in
any direction. See Fig. 3 for additional information. Unit
operating weight is shown in Table 1.
Four lifting holes are provided in ends of unit base rails
as shown in Fig. 3. Refer to rigging instructions on unit.
POSITIONING — Maintain clearance, per Fig. 4 and 5,
around and above unit to provide minimum distance from
combustible materials, proper airflow, and service access.
Do not install unit in an indoor location. Do not locate
unit air inlets near exhaust vents or other sources of con-
taminated air. For proper unit operation, adequate combus-
tion and ventilation air must be provided in accordance with
Section 5.3 (Air for Combustion and Ventilation) of the
National Fuel Gas Code, ANSI Z223.1 (American National
Standards Institute).
Although unit is weatherproof, guard against water from
higher level runoff and overhangs.
Locate mechanical draft system flue assembly at least
4 ft from any opening through which combustion products
could enter the building, and at least 4 ft from any adjacent
building. When unit is located adjacent to public walk-
ways, flue assembly must be at least 7 ft above grade.
ROOF MOUNT — Check building codes for weight dis-
tribution requirements. Unit weight is shown in Table 1.
Instructions continued on page 9.
1 0'-0"
(3048)
SPREADER BARS и DETAIL A"
4 RIGGING HOOK
UNIT BASE RAIL
SEE
"DETAIL A"
NOTES:
MAXIMUM SHIPPING DIMENSIONS 1. Dimensions in ( ) are in millimeters
BT WEIGHT A B 2. Refer to Table 1 for unit operating weights.
~ 1 ji 3. Remove boards at ends of unit and runners prior to rigging.
Lb Kg Ftin. | mm | Ft-in. | mm 4. Rig by inserting hooks into unit base rails as shown. Use corner
D016 1834 832 6-11% | 2121 | 3-2 965 post from packaging to protect coil from damage. Use bumper
D020 2131 967 6-111 | 2121 | 3-3 991 boards for spreader bars on all units except 48TJE024 and 028.
0024 2131 967 6-11 | 2121 | 3-3 991 5. Weights sio not include optional economizer. See Table 1 for econo-
D028 2514 1140 6-11 | 2121 | 3-3 991 6. Weights given are for aluminum evaporator coil plate fins and
411 . copper condenser coil plate fins Weights of other metal combi-
E016 1854 841 6-112 | 2121 | 3-2 965 nations are listed in Table 1.
E024 2441 1094 B- 774 | 2623 | 4-2 | 1270
E028 2793 1267 8- 774 | 2623 | 4-2 | 1270 A CAUTION
All panels must be in place when rigging
Fig. 3 — Rigging Details
at
CORNER D 1 3/8” DIA. DRAIN HOLE
IE … ‚ 2121) CORNER €
-3 778% я 6°-11 1/2
(99) 1-7 13/16” *-4 5/16 00e-1”-4 9/16 /10-0/-3 15/16" _/-0°-1 5/16” 0-5 15/16”
‘ “= (504) (415) (421) (108 (151)
p°-8 1/8 an ;
(206) | — re
= (SN) UN: Ï (109)
г | |
O — DT fra, | |
| |
| | ! |
3-2 | 28 15/16*-—
6 | (986) 2-1 5/8”
OUTDOOR! [SUPPLY (651)
| AIR
SECTION | i LL (T3
RETURN S°-11 7/8” a |
AIR (1825) do he=1 “-6 5/16
5’-7 3/16” 5 pa
(1707) VIEW 7-Z
2-2 1/18"
(662) >
\
| POWER EXHAUST
\ (ACCESSORY ONLY)
|
|
|
|
|
|
|
bo (1753)
| т 7-2 1/8" POWER EXHAUST
| ( 2187) CACCESSORY ONLY)
|
|
|
|
|
—
|
i
|
|
| {
| |
| !
| |
| i
| i
| I
| a — |
1 i |
i | |
| | | | |
| 1 |
| | |
! |
| |
| |
| !
| |
| |
! |
|
|
+
0-10 hans MN > PETT 2-8 ori de"
274) 0 Y 7 Z 0-7 3/4" a
1 pd | 6097)
(965) +, ‘ le DIA HOLE
OR ; 0°-5
OUT OL 2 DIA K.O. 0-52 e 7 10 (22)
(51) (127) — 07-11 15/167
(303
CORNER A 3° 2 1 3/8" DIA CONCENTRIC K.O.
78) 95)
06 y CONTROL BOX
ILTERS 25% ALR OR
|| TOP Veces FAR s10€/ = -10 ape y Eonia KooD
> = y
e ESP Eo
LEFT SIDE + SECTION A-A
3°-9° 0°-3 7/16"
(1143) — 1 en
o = —Ñ Tamer +
0 | = | 210%
| o" 1°-6 3/8
(559) ТУР \ (467)
| 01 1/7" }
ОЙ TN
ge CORNER WEIGHT*
! or J | 020 ou” pd т es UNIT A B С D
D y INDOOR Cott ALTERNATE RETURN 4874 ib | Ka | Lb T Ka | Lb T Ka | Lb TK
HEAT EXCHANGER ACCESS PANEL, prRONT . 9 9 9 9
3/4” FPT DRAIN CONNECTION
AÑO CENTER POST EOS PANEL (27) FAR SIDE ONLY Do16 | 348 | 158 | 360 | 163 | 373 | 169 | 523 | 237
D020 | 362 | 164 | 483 | 219 | 495 | 225 | 511 | 232
E016 | 355 | 161 | 363 | 164 | 377 | 171 | 530 | 240
07 420m *Weights are for unit only and do not include options or
(102) — Lo 3” 8 7/9 DIA CONCENTRIC K.O. crating.
0-3 1/48 fe | SD (76) & (22) (FIELD POWER)
(79) NOTES:
1 Dimensions in ( ) are in millimeters
== ,
2, 4, Center of gravity
3, Direction of airflow
| 4. Ductwork to be attached to accessory roof curb only
5. Minimum clearance:
a Rear: 7'0" (2134) for coil removal This dimension can be re-
0-3" / duced to 4'0” (1219) if conditions permit coil removal from the
(76) top.
$ Ф b. Left side: 4'0” (1219) for proper condenser coil airflow
, 1 . ; N c. Front: 4'0” (1219) for control box access
A to A < | d Right side: 4'0” (1219) for proper operation of damper and
т UE power exhaust if so equipped
3 5/8” 2 1 3/8 OIA CONCENTRIC K.O. TE ge e Top: 6/0” (1829) to assure proper condenser fan operation
0-2 7/8" (92) 8 (35) (FIELD POWER) 076 f. Local codes or jurisdiction may prevail
(73) ._3 2/07 |L- 748 DIA K.0. (CONTROL) 1 1/4 DIA Hoe © With the exception of clearance for the condenser coil and the
es) Na 1/2” DIA K.O. (GAS ENTRY) 3/4” NPT (32) damper/power exhaust as stated in Note No. 5, a removable fence
Vas + (38) or barricade requires no clearance.
, so 5-6” 7. Dimensions are from outside of corner post. Allow 0'-%1s” (8) on
0-2 VA = (1676) each side for top cover drip edge
Fig. 4 — Base Unit Dimensions, 48TJ016,020
CORNER WEIGHT" DIMENSIONS
1 A B С D A B С р Е
Lb Kg Lb Kg Lb Kg Lb Kg | Ft-in. mm Ft-in. mm Ft-in. | mm Ft-in. mm Ft-in. mm
D024 | 495 | 225 | 483 | 219 | 362 | 164 | 511 | 232 3-3 991 3-7 1092 0-3 76 | 611% | 2121 | 1-71%e 504
E024 | 431 | 196 | 421 | 191 | 494 | 224 | 685 | 311 4-2 1270 3-4 1016 | 0-4% | 114 | 8- 7% | 2623 3-3% 1006 ®
D028 | 523 | 237 | 541 245 | 574 | 260 | 596 | 270 3-3 991 3-7 1092 0-3 76 | 6-11% | 2121 1-71%es 504
E028 | 465 | 211 486 | 220 | 725 | 329 | 737 | 334 4-2 1270 3-5 1041 0-42 114 | 8- 7% | 2623 3-3% 1006
“Weights are for unit only and do not include options or crating
CORNER D 1 3/97 DIA DRAIN HOLE
TYP (4) PLCS CORNER A
0-3 7/6” D (2121) es
(99) re E ——opel -4 5/16%qe1 -4 9/16% 072 15/16" __/ 9". 5/16" 0-5 15/16”
0 -8 1/8 REAR (415) > (421) [ace | (33) (151)
(206) |
E 0-4 5/16”
+ OS { (109)
- zz —3
— ,
| |
; — -6 15/16 re
(786)
}
RETURN} | ame |
5-7 3/16" (466)
(1707)
> POWER EXHAUST
(ACCESSORY ONLY)
—— 4 $011 1/8”
. (283)
0*-10 13/16” > 7 aa
270 E 0 iQ Ts |
/ roar] ~~ i Ï DD T
A
OUTDOOR *_e” 7/8" DIA HOLE
COIL 2” DIAKO cod Tle O An (22)
(51) Fe —l 0-11 15/16”
(303) CORNER B
CORNER C 3° 8 1 3/8” DIA CONCENTRIC K ©
(76) (35)
Me ELIMINATOR
Î FILTERS ACCESS - ACCESO
0-2 1/4" TOP (567) 25%
62} AR SIDE TA _ : ÉCONOMIZER Soon 0-3"
7 , a , > N 1-10 ak A 1 (76) O
5/16” FIELD- ——— 0 -a"
(339) (102)
LAPT SIDE { SUPPLIED |
3-8 1/4 0 -3 72/16" SECTION A-A
(1124) Zen
=> —4 “ans Y
RIGHT
| es SIDE
- 1'-6 3/8"
69 IN (467)
| E ——— |
Lo + 1
ÿ I
| JLo 0 Л + 1
01 178" sh) INDOOR COIL
(38) ALTERNATE RETURN NOTES:
en FAR DE ORLY N 1 Dimensions in ( )are in millimeters
2 < Center of gravity
vo „Г
{ — *-2° 3° & 7/8 DIA CONCENTRIC K i i i
0-3 18% tal | re (76) 8 (22) (FIELD POWER) | 3 Direction of airflow
Ш 4 Ductwork to be attached to accessory roof curb only
5 Minimum clearance:
r a Rear: 7'0” (2134) for coil removal This dimension can be
reduced to 4'0” (1219) if conditions permit coil removal from
e top
b 4'0" (1219) to combustible surfaces, all four sides (in-
cludes between units).
/ с Left side: 4'0" (1219) for proper condenser coil
airflow
о -3° / d Front: 4'0” (1219) for contro! box access
| ve 4 e Right side: 4°0” (1219) for proper operation of damper and
5 ie ower exhaust (if so equipped)
0:4 14° — | — f Top: 6'0" (1829) to assure proper condenser fan
(108) I operation
! g. Bottom: 14 (356) to combustible surfaces (when not using
| R= 3.508 a 3/8 „DIA CONCENTRIC K O curb)
0°-2 7/8" (FIELD POWER) h Control box side: 3'0" (914) to ungrounded surfaces
Tora 7/8" N 192, 4 K 9 (CONTROL 1 1/4" DIA HOLE (non-combustible).
DIMENSIONS 98) 1 eid DIA KO (GAS ENTRY) 3/4” NPT (32) i Control box side: 3'6” (1067) to block or concrete walls, or
EDGE OF ' 316 (38) , other grounded surfaces
UNIT CABNET 0-2 5 = 5 -6 j. Local codes or jurisdiction may prevail
(1676) 6. With the exception of clearance for the condenser coil and the
damper/power exhaust as stated in Note No. 5, a removable
fence or barricade requires no clearance
7 Dimensions are from outside of corner post Allow
0'-516” (8) on each side for top cover drip edge
Fig. 5 — Base Unit Dimensions, 48TJ024-028
Table 1 — Physical Data
016D/E
UNIT SIZE 208/230,460 v | 575 v 020D 024D/E 028D/E
PA NOMINAL CAPACITY (tons) 15 18 20 25
e OPERATING WEIGHT (ib)
nit
Al/Al* 1604/1624 1850 1850/2031 2234/2413
Al/Cu* 1684/1704 1980 1980/2161 2364/2543
Cu/Cu* 1754/1774 2090 2090/2271 2474/2653
Economizer 110 110 110 110
Roof Curbt 200 200 200/213 200/213
COMPRESSOR Semi-Hermetic Hermetic Semi-Hermetic
Quantity 1 2 2 2
Oil (02) 130 65 ea 65 ea 152 ea
REFRIGERANT TYPE R-22
Operating Charge (ib-02)
Circuit 1** 19-4 15-4 15-8 16-12
Circuit 2 — 12-6 15-8 15-12
CONDENSER COIL Enhanced Copper Tubes, Aluminum Lanced or Copper Fins
Rows...Fins/in. 2.17 3..15 4.15 4.15
Total Face Area (sq ft) 22 2 22.2 22.2 22.2
CONDENSER FAN Propeller Type
Nominal Cfm 10,500 10,500 14,200 14,200
Quantity...Diameter (in.) 3...22 3...22 2.. 30 2...30
Motor Hp...Rpm Y...1050 7. .1050 1.. 1075 1..1075
Watts Input (Total) 1100 1100 3400 3400
EVAPORATOR COIL Copper Tubes, Aluminum or Copper Plate Fins
Rows...Fins/in. 2...17 3...17 4 15 4..15
Total Face Area (sq ft) 17.9 17.9 17.9 17.9
EVAPORATOR FAN Centrifugal Type
Quantity...Size (in.) 2.10x10 2..10x 10 | 2...12 х 12 2...12 х 12 2 12x12
Type Drive Belt Belt Belt Belt Belt
Nominal Cfm 6000 6000 7200 8000 10,000
Motor Hp 37 3.0 5 7% 10
Maximum Continuous Bhp 4.25 3.45 5.90 8.7 4601 SV] 10€ F8 [460 4] SV]
Motor Frame Size 56H 56H 184T 213T 215T
Nominal Rpm High/Low — — — — —
Fan Rpm Range 1194-1526 1201-1462 | 1047-1251 1238-1494 1323-1579
Motor Bearing Type Ball Ball Ball Ball Ball
Maximum Allowable Rpm 1550 1550 1550 1550 1550
Motor Pulley Pitch Diameter Min/Max (in.) 3.4/4.4 4.3/5.3 4.9/5.9 5.4/6.4 58/7.0
Nominal Motor Shaft Diameter (in.) И 7% 1% 1% 1%
Fan Pulley Pitch Diameter (in.) 5.0 6.4 8.4 79 7.9
Nominal Fan Shaft Diameter (in.) 1%s 13/16 17/16 176 176
Belt, Quantity... Type...Length (in.) 1...AX...42 1...BX...45 | 1...BX...50 1.. BX...50 1...BX...51
Pulley Center Line Distance (in.) 13.5-15.5 13.5-15.5 13.3-14.8 14.6-15 4 14.6-15.4
Speed Change per Full Turn of
Movable Pulley Flange (rpm) 66 52 34 43 43
Movable Pulley Maximum Full Turns
From Closed Position 5 5 6 6 6
Factory Setting 35 3.5 3 3 3
Factory Speed Setting (rpm) 1293 1279 1149 1366 1451
Fan Shaft Diameter at Pulley (in.) 13/6 1%6 1716 17/16 176
Table 1 — Physical Data (cont)
UNIT SIZE 016D/E
020D 024D/E 028D/E
FURNACE SECTION
Rollout Switch Cutout
Temp (F)tt 190
Burner Orifice Diameter
(in. ...drill size)
Natural Gas 113..33
Pilot Orifice Diameter
(Quantity) in. ...drill size
Natural Gas (1) 055...54/
(1) .055 54,
(1) 041 59
Thermostat Heat Anticipator
Setting (amps)
208/230,575 v Stage 1 98
Stage 2 44
460 v Stage 1 1.20
Stage 2 44
Gas Input (Btuh) Stage 1 115,500/115,500
Stage 2 231,000/270,000
Efficiency (Steady
State) (%) 80
Temperature Rise Range 25-55/25-55
Manifold Pressure
(in. wg)
Natural Gas 3.5
Gas Valve Quantity 2
Field Gas Connection
Size (in.) Ya
190 190 190
113 33 113 ..33 ‚113 33
(1) .055 ..54 (1) 055.. 54, (1) .055 54,
(1) 041 ..59 (1) .041. 59/ (1) 041 .59/
(2) 070 .50 (2) .070. 50
98 98 98
44 44 44
120 120 120
44 44 44
115,500 115,500/242,500 115,500/242,500
270,000 270,000/485,000 270,000/485,000
80 80 80
15-45 15-45/35-65 15-45/35-65
35 35 3.5
2 2 2
Y Ya Ya
HIGH-PRESSURE SWITCH (psig)
Standard Compressor
Internal Relief (Differential)
Cutout
Reset (Auto.)
LOW-PRESSURE SWITCH (psig)
Cutout
Reset (Auto.)
FREEZE PROTECTION
THERMOSTAT (F)
Opens
Closes
OUTDOOR-AIR INLET SCREENS
Quantity...Size (in.)
426
320
7
22
30 +5
45 + 5
Cleanable
2 20x25x1
1..20 x 20 x 1
RETURN-AIR FILTERS
Quantity...Size (in.)
Throwaway |
4.20 x 20 x 2
4 16x20x2
LEGEND
Al — Aluminum
Bhp — Brake Horsepower
Cu — Copper
*Evaporator coil fin material/condenser coil fin material.
{Weight of 14-in. roof curb
**On 48TJ020-028 units, Circuit 1 consists of lower portion of con-
denser coil and lower portion of evaporator coil, and Circuit 2 is the
upper portion of both coils.
wu’
{tRollout switch is manual reset
The 48TJ028 unit requires 2-in. industrial-grade filters capable of
handling face velocities of up to 625 ft/Min (such as American Air
Filter no 5700 or equivalent)
NOTE: The 48TJ016-028 units have a low-pressure switch (stand-
ard) located on the suction side
Step 3 — Field Fabricate Ductwork — Secure all
ducts to building structure. Use flexible duct connectors be-
tween unit and ducts as required. Insulate and weatherproof
all external ductwork, joints, and roof openings with counter
flashing and mastic in accordance with applicable codes.
Ducts passing through an unconditioned space must be
insulated and covered with a vapor barrier.
Step 4 — Make Unit Duct Connections — Unit
is shipped for through-the-bottom duct connections. Duct
ху НЕАТ
„—ЕХСНАМСЕВ
DL
Na
SEE SEE NOTE
“E \_ 5 ODE
NOTE: Do not drill in this area; damage to basepan may result in
water leak
Fig. 6 — Air Distribution — Through-the-Bottom
HEAT
*~ EXCHANGER
CIN
SEE | SEE NOTE
—\ ``
ALS
{ ] МИ
AIR OUT AIR IN AIR OUT
NOTE: Do not drill in this area; damage to basepan may result in
water leak
Fig. 7 — Concentric Duct Air Distribution
work openings are shown in Fig. 1, 4, and 5. Duct connec-
tions are shown in Fig. 6. Field-fabricated concentricduct-
work may be connected as shown in Fig. 7 and 8. Attach
all ductwork to roof curb and roof curb basepans.
Step 5 — Install Flue Hood — Flue hood is shipped
secured under main control box. To install, secure flue hood
to access panel. See Fig. 9 and 10.
NOTE: When properly installed, flue hood will line up with
combustion fan housing. See Fig. 11 and 12.
—— 6-23 Max
nO 74 57
e _
Eee
Pre see RE pese ee e y
EE
—
BAFFLE
NOTE: Dimensions A, A’, B, and B' are obtained from field-
supplied ceiling diffuser.
EEES: areas indicate block-off pans
Fig. 8 — Concentric Duct Details
COMBUSTION
FAN HOUSING
(INSIDE)
SE SE ca
ee en ee ms
= чи sc Were e
SS О у mi
me uh pe as . "
cen о ii De .
e BE
о qe x
| . "
a
5 e О о
o ENT DT
Fig. 9 — Flue Hood Location, 48TJD Low- Heat and
48TJE016 High-Heat Units
FLUE HOODS
“
sue Eu ола ея
naa eee
ad
PERA ae
ah a a + латы
xan
A
A NE . a a a ee ae n
en CAN ETES
$ as анны A = a , Sins AS ко x A a кл aa ; кА = xr
Aap a wn
uk
=
4 pe
Li
E
= NF К
pS Lo
EE
Fig. 10 — Flue Hood Locations, 48TJE024 and 028
High-Heat Units
TE ee nas
de EE RE ss NN NI EAU VO
ORLEANS PON OU A OT
o o
PRESSURE — 5255 or
SWITCH Meza OZ. + СОНЯ
a
oles Li
‘oy a A, nn “ete A EE "oy CL Naa ay) FL) CEL)
TA nro A RS EAE
DE AI ee AN
COMBUSTION 224 Br
FAN HOUSING 25 ón
Галича на.
rea ace CC
С Гира
НЕАТ
EXCHANGER
SECTION
г
-
die
я Lo
fa AN a арий
rel ани IC ла
Re
- pn Cos
Fig. 11 — Combustion Fan Housing Location,
48TJD Low-Heat Units and
A48TJE016 High-Heat Units
et
10
mm mh NR ME
AA nn
ото еее в
Во eee Cla]
NAO
“= лы =
+
EE EE NC E ; LR he
Bye WF
a
A A a
CALA AA
a -
au vs
Ca an at
к
ot
E
=.
. = ENSUE
O mas
COMBUSTION FAN HEAT EXCHANGER
HOUSINGS SECTIONS
Fig. 12 — Combustion Fan Housing Location,
48TJE024 and 028 High-Heat Units
Step 6 — Trap Condensate Drain — See Fig. 13
for drain location. One %4-in. half coupling is provided
inside unit evaporator section for condensate drain connec-
tion. An 8% in. x %4-in. diameter and 2-in. x %4-in. diam-
eter pipe nipple, coupled to standard %4-in. diameter elbows,
provides a straight path down through hole in unit base rail
(see Fig. 14). À trap at least 4-in. deep must be used.
Step 7 — Install Gas Piping — Unit is equipped for
use with natural gas. Installation must conform with local
building codes or, in the absence of local codes, with the
National Fuel Gas Code, ANSI Z223.1.
Install manual gas shutoff valve with a /4-in. NPT pres-
sure tap for test gage connection at unit. Field gas piping
must include sediment trap and union. See Fig. 15.
A WARNING
Do not pressure test gas supply while connected to unit.
Always disconnect union before servicing.
Natural gas pressure at unit gas connection must not be
less than 5 in. wg or greater than 13.5 in. wg.
Size gas-supply piping for 0.5-in. wg maximum pressure
drop. Do not use supply pipe smaller than unit gas
connection.
3/4-IN. FPT 1-3/8 IN.
DRAIN CONNECTION DRAIN HOLE
8 IN
Fig. 13 — Condensate Drain Details
(48TJ016 Shown)
3/4" FPT
DRAIN CONNECTION
(HALF COUPLING)
BASE RAIL —
8 1/2-IN (FIELD- —™]
SUPPLIED) NIPPLE
2-IN. (FIELD-SUPPLIED) NIPPLE
Fig. 14 — Condensate Drain Piping Details
MANUAL SHUTOFF
GAS
X N
| SUPPLY
7 \
PRESSURE TAP
(1/8" NPT PLUG)
TO
—
UNIT
3
UNION SEDIMENT TRAP
Fig. 15 — Field Gas Piping
Step 8 — Make Electrical Connections
FIELD POWER SUPPLY — Unit is factory wired for volt-
age shown on unit nameplate.
When installing units, provide a disconnect per NEC
(National Electrical Code) of adequate size (Table 2).
All field wiring must comply with NEC and local
requirements.
Route power and ground lines through control box end
panel or unit basepan (see Fig. 4 and 5) to connections as
shown on unit wiring diagram and Fig. 16.
A WARNING
The unit must be electrically grounded in accordance
with local codes and NEC ANSI/NFPA 70 (National
Fire Protection Association).
Field wiring must conform to temperature limitations for
type “T” wire, All field wiring must comply with NEC
and local requirements.
3
|
!
-
| | TBI
| | FIELD
m 2]
POWER
| 50 ——— La e]
= SUPPLY
| Sa |
| Ba l
La |
|
| |
| [Um == e= que UT Cana ques eu ———{ [7]
| | EQUIP GND
Lo
TB1 MAXIMUM WIRE SIZES
UNIT VOLTAGE
48TJ 208/230 460 575
016 2/0 2/0 2/0
020,024 2/0 2/0 2/0
028 2/0 2/0 2/0
LEGEND
EQUIP — Equipment
GND — Ground
NEC — National Electrical Code
TB — Terminal Board
Fig. 16 — Field Power Wiring Connections
Transformer no. 1 is wired for 230-v unit. If 208/230-v
unit is to be run with 208-v power supply, the transformer
must be rewired as follows:
1. Remove cap from red (208 v) wire.
2. Remove cap from orange (230 v) spliced wire.
3. Replace orange wire with red wire.
4. Recap both wires.
IMPORTANT: BE CERTAIN UNUSED WIRES
ARE CAPPED. Failure to do so may damage the
transformers.
Operating voltage to compressor must be within voltage
range indicated on unit nameplate. On 3-phase units, volt-
ages between phases must be balanced within 2%.
Table 2 — Electrical Data
VOLTAGE COMPRESSOR COMBUSTION
UNIT NOMINAL EM RANGE NO. 1 NO 2 OFM IFM FAN MOTOR* POWER SUPPLY
48TJ
(60 Hz) Min | Max | RLA | LRA | RLA | LRA | Qty | Hp (ea) Hp | FLA FLA MCA | MOCPI
208/230
(3 phase) Std 187 | 254 | 610 | 266 — — 3 % | 170 | 37 | 12.0120 0 57 93/93 150/150
016 460
(15 Tons) | (3 phase) Std 414 | 508 | 28.0 | 120 — — 3 % | 0.80 | 3.7 54 0.30 43 70
575
(3 phase) Std 518 | 632 | 230 96 — — 3 Y | 0.75 | 3 38 0.57 35 50
@ phase) Std | 187 | 254 | 28.3 | 205 | 250 | 185 | 3 | % | 1701 5 | 1671152 057 82/81 | 110/100
020 460
(18 Tons) | (3 phase) Std 414 | 508 | 14.4 | 104 | 12.4 89 3 2 | 080 | 5 7.6 030 40 50
575
(3 phase) Std 518 | 632 | 11.4 78 | 104 78 3 Ya | 075 | 5 61 057 33 40
208/230 | Std | 187 | 254 | 345 | 239 | 283 | 205 | 2 | 1 | 550 | 7% | 242/220 057 107/104 | 125/125
(3 phase)
024 460
(20 Tons) | (3 phase) Std 414 | 508 | 17.0 | 119 | 144 | 104 2 1 280 | 71% 110 030 52 60
575
(3 phase) Std 518 | 632 | 15.2 | 111 | 114 78 2 1 3.40 | 7% 90 057 46 60
@ phase) Std | 187 | 254 | 43.6 | 228 | 436 | 228 | 2 | 1 | 550 | 10 | 308/280 057 140/137 | 175/175
028 460
(25 Tons) | (3 phase) Std 414 | 508 | 221 | 114 | 221 | 114 2 1 280 | 10 14.0 0.30 69 90
575
(3 phase) Std 518 632 | 179 91 | 179 91 2 1 3.40 | 10 11.0 0.57 57 70
LEGEND 2 Unbalanced 3-Phase Supply Voltage
Never operate a motor where a phase imbalance in supply voltage is greater
FLA — Full Load Amps i im-
HACR — Heating, Air Conditioning and Refrigeration (han 2% Use the following formula to determine the percent voltage im
IFM — Indoor (Evaporator) Fan Motor
LRA — Locked Rotor Am $ % Voltage Imbalance
— Minimum Circuit Amps ati
MOCP _ Maximum Overcurrent Protection _ 400 x max voltage deviation from average voltage
— National Electrical Code
OFM %+T— Outdoor (Condenser) Fan Motor average voltage
RLA — Rated Load Amps Example: Supply voltage is 460-3-60
*The 48TJ024 and 028 high-heat units have 2 combustion-fan motors AB = 452 v
TFuse or HACR circuit breaker A BC BC = 464 v
AC = 455v
Warnock Hersey Average Voltage = _— =
_ 1871
Eu 3
Ш Ш ER © = 457
Determine maximum deviation from average voltage
NOTES: (AB) 457 - 452 = 5v
1 In compliance with NEC requirements for multimotor and combination load (BC) 464 - 457 = 7 у
equipment (refer to NEC Articles 430 and 440), the overcurrent protective (AC) 457 - 455 = 2v
device for the unit shall be fuse or HACR breaker Canadian units may be Maximum deviation is 7 v
use or circuit breaker. Determine percent voltage imbalance
% Voltage Imbalance = 100 x
457
= 153%
, | This amount of phase imbalance is satisfactory as it is below the maximum
# allowable 2%
IMPORTANT: If the supply voltage phase imbalance is more than 2%,
contact your local electric utility company immediately
12
Settings may be changed slightly to provide a greater de-
gree of comfort for a particular installation.
Refer to Accessory Remote Control Panel instructions if
required.
Step 9 — Make Outdoor-Air Inlet
Adjustments
MANUAL OUTDOOR-AIR DAMPER — All units (ex-
cept those equipped with a factory-installed economizer) have
a manual outdoor-air damper to provide ventilation air.
THERMOSTAT ASSEMBLY
REMOVABLE JUMPER
n № в 9 GE
р панно
a g 2 É Xx ÉS
Fig. 17 — Field Control Thermostat Wiring
me
25% ADJUSTABLE
AIR DAMPER
/
I
R 4 À
L [À / BASE
° \ “$T UNIT
\
Ан
LI
Y J
SECURING SCREWS
Fig. 18 — 25% Outdoor-Air Section Details
aa 8 me EE a a a Teta TT a aa ea eta tt a at
AÑ A ET a ae te a Te a a te et Te a hea РЕЯ
„же ож TT a "a a a a TS О
Cat TR
COOLING
LOCKOUT
SWITCH
ECONOMIZER
BER de HR I
ECONOMIZER LAN CN o
MOTOR RE ES Pes ERE
CONTROL in oe > : os
MODULE E Cee В
FILTERS
OUTDOOR
AIR
THERMOSTAT
ECONOMIZER. E К
DAMPER м в о: 2 rs esd ee
E Es
ASSEMBLY
EA .
Fig. 19 — Economizer Damper
Assembly-End View
Damper can be preset to admit up to 25% outdoor air
into return-air compartment. To adjust, loosen securing screws
and move damper to desired setting, then retighten screws
to secure damper (Fig. 18).
OPTIONAL ECONOMIZER
Economizer Motor Control Module (See Fig. 19-21) — Set
economizer motor to the D setting (Fig. 20).
Damper Vent Position Setting
1. Set fan switch at ON position (continuous fan operation)
and close night switch if used.
2. Set system selector switch at OFF position.
3. Turn damper adjustment knob located on control mod-
ule clockwise slowly until dampers assume desired vent
position. Do not manually operate economizer motor.
Damage to motor will result.
” ) =
"0-0
Ok] Г
so +
A D
____ CHANGEOVER
| | + | SET POINT
5
© —
1: Г MINIMUM
DAMPER
мммим ° _ Y — POSITION
CIE — SETTING
=z | LED LIGHTS UP
OPEN TO INDICATE
P PI OUTDOOR AIR
IS SUITABLE FOR
1 FREE COOLING
LED — Light-Emitting Diode
Fig. 20 — Economizer Motor Control Module
ECONOMIZER MOTOR
y
;
OI
N
>
СО © SER
>”
Callao Calla Loa
`Е
au _
/ ECONOMIZER
ASS EEE ne
Fig. 21 — Economizer Motor Control
Module Location
Step 10 — Install Outdoor-Air Hood — The
outdoor-air hood is common to 25% air ventilation and econo-
mizer. If economizer is used, all electrical connections have
been made and adjusted at the factory. Assemble and in-
stall hood in the field.
NOTE: The hood top cover, upper and lower filter retain-
ers, hood drain pan, baffle (020-028), and filter support bracket
are secured opposite the condenser end of the unit. The screens,
hood side panels, remaining section of filter support bracket,
seal strip, and hardware are in a package located inside the
return-air filter access panel (Fig. 22).
1. Attach seal strip to upper filter retainer. See Fig. 23.
2. Assemble hood top cover, side panels, upper filter
retainer, and drain pan (see Fig. 24).
3. Secure lower filter retainer and support bracket to unit.
See Fig. 24. Leave screws loose on 020-028 units.
4. Slide baffle (020-028) behind lower filter retainer and
tighten screws.
5. Loosen sheet metal screws for top cover of base unit
located above outdoor-air inlet opening.
6. Match notches in hood top cover with unit top cover
screws. Insert hood flange between top cover flange and
unit. Tighten screws.
7. Insert outdoor-air inlet screens and spacer in channel
created by lower filter retainer and filter support
bracket.
8. Attach remaining section of filter support bracket.
START-UP
Use the following information and Start-Up Checklist
on page CL-1 to check out unit PRIOR to start-up.
Unit Preparation — Check that unit has been installed
in accordance with these installation instructions and appli-
cable codes.
Compressor Mounting — Loosen the compressor hold-
down bolts on 48TJO16 and 028 units until sidewise move-
ment of the washer under each holddown bolt head can be
obtained. Do not loosen completely as bolts are self-
locking and will maintain adjustment.
NOTE: DO NOT loosen holddown bolts on 48TJ020 and
024 units with hermetic compressors.
Internal Wiring — Check all electrical connections in
unit control boxes; tighten as required.
Refrigerant Service Ports — Each refrigerant sys-
tem has 1 suction port located in the top of the compressor
motor casing (semi-hermetic compressors) or on the suc-
tion line (hermetic compressors). All units also have one
service port on the liquid line and one on either the com-
pressor discharge flange or discharge line. Be sure that caps
on the ports are tight. N
Crankcase Heater(s) (48TJ016 and 028 Only)
— Crankcase heater(s) is energized as long as there is power
to the unit. ;
IMPORTANT: Unit power must be on for 24 hours
prior to start-up. Otherwise, damage to compressor
may result.
Evaporator Fan — Fan belt and variable pulleys are
factory-installed. See Tables 3-7 for Fan Performance Data.
Remove tape from fan pulley, and be sure that fans rotate
in the proper direction. See Table 8 for air quantity limits.
See Table 9 for static pressure information for accessories
В
14
wt
OUTDOOR-AIR HOOD AND
MOUNTING BRACKETS
A
>
y >< @
I e Pe te
| „” ~~
| E > >
“=. J
re XG |
PACKAGE AND
HOOD
COMPONENTS >
RETURN-AIR FILTER
ACCESS PANEL
Fig. 22 — Outdoor-Air Hood Component Location
HOOD TOP PANEL
HOOD DRAIN
и РАМ
Fig. 23 — Seal Strip Location
UPPER FILTER
RETAINER
SEAL STRIP
HOOD SIDE
PANELS (2)
HOOD TOP
PANEL
LOWER
FILTER
RETAINER
FILTER SUPPORT
BRACKET
HOOD DRAIN PAN
UPPER FILTER RETAINER
Fig. 24 — Outdoor-Air Hood Details
and options. To alter fan performance, see Evaporator Fan
Performance Adjustment section on page 20.
Condenser-Fans and Motors — Condenser fans and
motors are factory set. Refer to Condenser-Fan Adjustment
section on page 21 as required. Be sure that fans rotate in
the proper direction.
e
Return-Air Filters — Check that correct filters are in-
stalled in filter tracks (see Table 1). Do not operate unit
without return-air filters.
Outdoor-Air Inlet Screens — Outdoor-air inlet screens
must be in place before operating unit.
Accessory Economizer Adjustment — Remove
filter access panel. Check that outdoor-air damper is closed
and return-air damper is open.
Economizer operation and adjustment are described in
Base Unit Operation section on page 18; and Economizer
Adjustment section on page 22.
Gas Heat — Verify gas pressures before turning on heat
as follows:
I. Turn off manual gas stop.
Connect pressure gage to supply gas tap (See Fig. 15 on
page 11).
Connect pressure gage to manifold pressure tap on gas
valve.
Turn on manual gas stop and set thermostat to HEAT
position. After the unit has run for several minutes, ver-
ify that incoming pressure is 5.0 in. wg or greater, and
that the manifold pressure is 3.5 in. wg. If manifold pres-
sure must be adjusted, refer to Gas Valve Adjustment
section on page 25.
. After unit has been in operation for 5 minutes, check
temperature rise across the heat exchangers. See unit in-
formative plate for correct rise limits of the heat sup-
plied. Air quantities may need to be adjusted to bring
the actual rise to within the allowable limits.
Table 3 — Fan Performance Data, 48TJ016 — 208/230-V and 460-V Units
EXTERNAL STATIC PRESSURE (in. wg)
em 0.2 0.4 0.6 0.8 1.0 1.2
Rpm | Bhp | Watts | Rpm | Bhp | Watts | Rpm | Bhp | Watts | Rpm | Bhp | Watts | Rpm | Bhp | Watts | Rom | Bhp | Watts
4500 8011105 | 933 | 890 | 1.26 | 1119 | 971 | 1.46 | 1297 | 1050 | 1 67 | 1483 | 1125 | 188 | 1670 | 1200 | 2.12 | 1883
4800 843 | 1.25 | 1110 | 928 | 1.47 | 1306 | 1006 | 168 | 1492 | 1081 | 1.90 | 1687 | 1153 | 2.13 | 1892 | 1223 | 2.36 | 2096
5100 885 | 147 | 1306 | 968 | 1.70 | 1510 | 1043 | 1.93 | 1714 | 1114 | 2 16 | 1918 | 1183 | 2.40 | 2131 | 1250 | 2.64 | 2345
5400 927 | 1.71 | 1519 | 1008 | 1.95 | 1732 | 1080 | 2.20 | 1954 | 1148 | 2.44 | 2167 | 1214 | 2.69 | 2389 | 1279 | 2.94 1 2611
5700 971 | 198 | 1758 | 1049 | 2.24 | 1989 | 1118 | 2.50 | 2220 | 1134 | 2 75 | 2442 | 1247 | 301 | 2673 | 1309 | 3.28 | 2913
6000 1016 | 2 28 | 2025 | 1091 | 2.55 | 2265 | 1158 | 2.83 | 2513 | 1222 | 3 10 | 2753 | 1282 | 336 | 2984 | 1342 | 3.64 | 3233
6300 1059 | 2.60 | 2309 | 1133 | 2 89 | 2567 | 1198 | 3.17 | 2815 | 1259 | 3.46 | 3073 | 1318 | 374 | 3321 | 1375 | 4.02 | 3570
6600 1104 | 2.96 | 2629 | 1174 | 3 26 | 2895 | 1239 | 3.56 | 3162 | 1297 | 386 | 3428 | 1355 | 4.15 } 3686 — — —
6900 1150 | 3.35 | 2975 | 1218 | 3.67 | 3259 | 1281 | 398 | 3535 — — — — — — — — —
7200 1194 | 377 | 3348 | 1260 | 4.10 | 3641 — — — — — — — — — — — —
7500 1238 | 4 23 | 3758 — — — — — — — — — — — — — — —
EXTERNAL STATIC PRESSURE (in. wg)
AIRFLOW 14 1.6 1.8 2.0
(Cfm) . . . .
Rpm | Bhp | Watts | Rpm | Bhp | Watts | Rpm | Bhp | Watts | Rpm | Bhp | Watts
4500 1275 | 2.39 | 2123 | 1349 | 2.70 | 2398 | 1421 | 303 | 2691 | 1490 | 3.39 | 3011
4800 1293 | 2.62 | 2327 | 1364 | 2 92 | 2593 | 1433 | 3.24 | 2877 | 1501 | 359 | 3188
5100 1316 | 290 | 2575 | 1382 | 3.18 | 2824 | 1448 | 3.49 | 3099 | 1514 | 3.86 | 3428
5400 1342 | 320 | 2842 | 1403 | 3.47 | 3082 | 1466 | 3.77 | 3348 | 1529 | 4.16 | 3694
5700 1370 | 354 | 3144 | 1429 | 3.81 | 3384 | 1487 | 411 | 3650 — — —
6000 1401 | 3.92 | 3481 | 1458 | 4.20 | 3730 — — — — — —
6300 — — — — — — — — — — — —
6600 — — — — — — — — — — — —
6900 — — — — — — — — — — — —
7200 — — — — — — — — — — — —
7500 — — — — — — — — — — — —
LEGEND mance table. See Table 9 for accessory/FIOP static pressure
information
Bhp — Brake Horsepower Input to Fan 3 inter n os
polation is permissible. Do not extrapolate.
Watts — Input Watts to Motor 4. Maximum continuous bhp is 4.25 and the maximum continuous
NOTES:
1. Factory shipped motor drive range is 1194 to 1526 rpm Other
roms require a field-supplied drive.
2 Static pressure losses (i e , economizer, electric heater) must be
added to external static pressure before entering Fan Perfor-
15
watts are 3775. Extensive motor and drive testing on these units
ensures that the full horsepower range of the motor can be uti-
lized with confidence. Using your fan motors up to the watts rat-
ing shown will not result in nuisance tripping or premature motor
failure. Unit warranty will not be affected.
Table 4 — Fan Performance Data, 48TJ016 — 575-V Units
EXTERNAL STATIC PRESSURE (in. wg)
A 0.2 0.4 0.6 0.8 1.0 1.2
Rpm | Bhp | Watts | Rpm | Bhp | Watts | Rpm | Bhp | Watts | Rpm | Bhp | Watts | Rpm | Bhp | Watts | Rpm | Bhp | Watts
4500 801 | 1.05 | 933 | 8901.26 | 1119 | 971 | 146 | 1297 | 1050 | 1 67 | 1483 | 1125 | 188 | 1670 | 1200 | 2 12 | 1883
4800 843 | 125 | 1110 | 928 | 1.47 | 1306 | 1006 | 1 68 | 1492 | 1081 | 190 | 1687 | 1153 | 213 | 1892 | 1223 | 2.36 | 2096
5100 885 | 147 | 1306 | 968 | 1.70 | 1510 | 1043 | 1 93 | 1714 | 1114 | 216 | 1918 | 1183 | 2 40 | 2131 | 1250 | 2.64 | 2345
5400 927 | 171 | 1519 | 1008 | 1.95 | 1732 | 1080 | 2 20 | 1954 | 1148 | 2 44 | 2167 | 1214 | 2.69 | 2389 | 1279 | 2.94 | 2611
5700 971 | 198 | 1758 | 1049 | 2.24 | 1989 | 1118 | 2.50 | 2220 | 1134 | 2 75 | 2442 | 1247 | 301 | 2673 | 1309 | 3.28 | 2913
6000 1016 | 2.28 | 2025 | 1091 | 2.55 | 2265 | 1158 | 2.83 | 2513 | 1222 | 310 | 2753 | 1282 | 3.36 | 2984 — — —
6300 1059 | 260 | 2309 | 1133 | 2.89 | 2567 | 1198 | 3.17 | 2815 — — — — — — — — —
6600 1104 | 2.96 | 2629 | 1174 | 3.26 | 2895 — — — — — — — — — — — —
6900 1150 | 3.35 | 2975 — — — — — — — — — — — — — — —
7200 — — — — — — — — — — — — — — — — — —
7500 — — — — — — — — — — — — — — — — — —
EXTERNAL STATIC PRESSURE (in. wg)
AIRFLOW 14 16 1.8 2.0
(Cfm) = - - =
Rpm | Bhp | Watts | Rpm | Bhp | Watts | Rpm | Bhp | Watts | Rpm | Bhp | Watts
4500 1275 | 2.39 | 2123 | 1349 | 270 | 2398 | 1421 | 3.03 | 2691 | 1490 | 3.39 | 3011
4800 1293 | 262 | 2327 | 1364 | 292 | 2593 | 1433 | 3.24 | 2877 — — —
5100 1316 | 290 | 2575 | 1382 | 3.18 | 2824 — — — — — —
5400 1342 | 320 | 2842 — — — — — — — — —
5700 — — — — — — — — — — — —
6000 — — — — — — — — — — — —
6300 — — — — — — — — — — — —
6600 — — — — — — — — — — — —
6900 — — — — — — — — — — — —
7200 — — — — — — — — — — — —
7500 — — — — — — — — — — — —
LEGEND mance table. See Table 9 for accessory/FIOP static pressure
information
Bhp — Brake Horsepower Input to Fan q Inter n Let
polation is permissible. Do not extrapolate.
Watts — Input Watts to Motor 4. Maximum continuous bhp is 3 45 and the maximum continuous
NOTES: watts are 3065. Extensive motor and drive testing on these units
1 Factory shipped motor drive range is 1201 to 1462 rpm. Other ensures that the full horsepower range of the motor can be uti-
2.
rpms require a field-supplied drive
Static pressure losses (i.e , economizer, electric heater) must be
added to external static pressure before entering Fan Perfor-
lized with confidence. Using your fan motors up to the watts rat-
ing shown will not result in nuisance tripping or premature motor
failure Unit warranty will not be affected
Table 5 — Fan Performance Data, 48TJ020
EXTERNAL STATIC PRESSURE (in. wg)
Aer 0.2 0.4 0.6 0.8 1.0 1.2
Rpm | Bhp | Watts | Rpm | Bhp | Watts | Rom | Bhp | Watts | Rpm | Bhp | Watts {| Rpm | Bhp | Watts | Rpm | Bhp | Watts
5000 669 | 110 | 1019 772 | 1.40 | 1291 870 | 1 80 | 1582 963 | 2.10 | 1903 | 1052 | 2.50 | 2251 | 1137 | 2.90 | 2623
5500 717 | +40 | 1292 813 | 1.80 | 1585 905 | 210 | 1892 992 | 250 | 2223 | 1076 | 290 | 2680 | 1157 | 3.30 | 2962
6000 767 | 180 | 1617 858 | 2.20 | 1932 944 | 2 50 | 2256 | 1026 | 2.90 | 2600 | 1104 | 330 | 2967 | 1181 | 3.80 | 3358
6500 817 | 220 | 1992 903 | 2.60 | 2329 985 | 3 00 | 2673 | 1062 | 3 40 | 3031 | 1136 | 380 | 3410 | 1209 | 4.30 | 3811
7000 869 | 2 70 | 2427 950 | 3 10 | 2787 | 1028 | 3.50 | 3151 | 1102 | 3.90 | 3527 | 1172 | 4.40 | 3919 | 1241 | 4.80 | 4331
7200 889 | 2 94 | 2624 969 | 3.34 | 2993 | 1046 | 3 74 | 3366 | 1118 | 4 18 | 3749 | 1187 | 4.64 | 4147 | 1255 | 5.08 | 4564
7500 920 | 330 | 2919 998 | 3 70 | 3303 | 1073 | 4.10 | 3689 | 1143 | 4.60 | 4083 | 1210 | 5.00 | 4490 | 1275 | 5.50 | 4914
8000 973 | 390 | 3476 | 1047 | 4 30 | 3886 | 1119 | 4.80 | 4294 | 1186 | 5.30 | 4708 | 1250 | 5 70 | 5131 — — —
8500 1026 | 460 | 4102 | 1097 | 5 10 | 4635 | 1166 | 5.60 | 4967 — — — — — — — — —
9000 1079 | 540 | 4800 — — — — — — — — — — — — — — —
EXTERNAL STATIC PRESSURE (in. wg)
AIRFLOW 1.3 1.4 1.6 © 1.8
(Cfm) - "“ " -
Rpm | Bhp | Watts | Rpm | Bhp | Watts | Rpm | Bhp | Watts | Rpm | Bhp | Watts
5000 1178 | 3.15 | 2820 | 1218 | 3.40 | 3016 | 1295 | 3 80 | 3425 | 1369 | 4 30 | 3849
5500 1196 | 355 | 3164 | 1234 1 3.80 | 3366 1 1309 | 420 | 3789 | 1381 | 470 | 4229
6000 1218 | 400 | 3565 | 1251 | 4.20 | 3772 | 1327 | 4.70 1 4206 | 1396 | 5.20 | 4658
6500 1244 | 450 | 4022 | 1279 | 4.70 | 4233 | 1348 | 5.20 | 4677 | 1415 | 5 80 | 5139
7000 1275 | 505 | 4547 | 1308 | 5.30 | 4762 — — — — — —
7200 1288 | 5 33 | 4783 — — — — — — — — —
7500 1307 | 5 75 | 5135 — — — — — — — — —
8000 — — — — — — — — — — — —
8500 — — — — — — — — — — — —
9000 — — — — — — — — — — — —
LEGEND mance table. See Table 9 for accessory/FIOP static pressure
information.
Bhp - Brake Horsepower Input to Fan 3 Inter n. o
_ polation is permissible Do not extrapolate.
Watts Input Watts to Motor 4. Maximum continuous bhp is 5 9 and the maximum continuous
NOTES:
1.
2,
Factory shipped motor drive range is 1047 to 1251 rpm. Other
rpms require a field-supplied drive.
Static pressure losses (i.e., economizer, electric heater) must be
added to external static pressure before entering Fan Perfor-
16
watts are 5180. Extensive motor and drive testing on these units
ensures that the full horsepower range of the motor can be uti-
lized with confidence Using your fan motors up to the watts rat-
ing shown will not result in nuisance tripping or premature motor
failure. Unit warranty will not be affected.
кое
Table 6 — Fan Performance Data, 48TJ024
EXTERNAL STATIC PRESSURE (in. wg)
AIRFLOW 0.2 0.4 0.6 0.8 1.0 1.2
(CFM) > " = = = в
— Rpm | Bhp | Watts | Rpm | Bhp | Watts | Rpm | Bhp | Watts | Rpm | Bhp | Watts | Rpm | Bhp | Watts | Rpm | Bhp | Watts
e 6000 767 | 1.80 | 1617 | 858 | 2.20 | 1932 | 944 | 250 | 2256 | 1026 | 290 | 2600 | 1104 | 3.30 | 2967 | 1181 | 380 | 3358
6500 817 | 2.20 | 1992 | 903 | 2.60 | 2329 | 985 | 300 | 2673 | 1062 | 340 | 3031 | 1136 | 3.80 | 3410 | 1209 | 430 | 3811
7000 869 | 2.70 | 2427 | 950 | 3.10 | 2787 | 1028 | 350 | 3151 | 1102 | 390 | 3527 | 1172 | 4.40 | 3919 | 1241 | 4.80 | 4331
7500 920 | 3.30 | 2919 | 998 | 370 | 3303 | 1073 | 4.10 | 3689 | 1143 | 4 60 | 4083 | 1210 | 5.00 | 4490 | 1275 | 5.50 | 4914
8000 973 | 3.90 | 3476 | 1047 | 430 | 3886 | 1119 | 4 80 | 4294 | 1186 | 530 | 4708 | 1250 | 5 70 | 5131 | 1313 | 6.20 | 5569
8500 | 1026 | 460 | 4102 | 1097 | 510 | 4635 | 1166 | 560 | 4967 | 1231 | 600 | 5401 | 1292 |6 50 | 5843 | 1352 | 7.00 | 6297
9000 | 1079 | 540 | 4800 | 1147 | 590 | 5257 | 1214 | 6.40 | 5714 | 1276 | 6.90 | 6171 | 1336 | 7 40 | 6632 | 1393 | 7.90 | 7102
9500 | 1133 | 6.20 | 5576 | 1199 | 6.80 | 6058 | 1263 | 7.30 | 6540 | 1323 | 7.90 | 7018 | 1381 | 840 | 7500 | 1436 | 8.90 | 7988
10,000 | 1188 | 7.20 | 6432 | 1250 | 7.80 | 6939 | 1313 | 8.30 | 7444 | 1371 | 8.90 | 7946 | 1426 | 9.50 | 8449 | — — —
EXTERNAL STATIC PRESSURE (in. wg)
Amo 1.4 16 1.8 1.9 2.0
Rpm | Bhp | Watts | Rom | Bhp | Watts | Rpm | Bhp | Watts | Rpm | Bhp | Watts | Rpm | Bhp | Watts
6000 | 1255 | 4.20 | 3772 | 1327 | 4 70 | 4206 | 1396 | 520 | 4658 | 1431 | 5.45 | 4884 | 1465 | 5 70 | 5110
6500 | 1279 | 4.70 | 4233 | 1348 | 5.20 | 4677 | 1415 | 580 | 5139 | 1449 | 6.10 | 5370 | 1482 | 6 40 | 5601
7000 | 1308 | 5.30 | 4762 | 1373 | 5 80 | 5215 | 1437 | 6.40 | 5686 | 1469 | 6.70 | 5922 | 1501 | 7.00 | 6157
7500 | 1339 | 6.00 | 5356 | 1401 | 6 50 | 5818 | 1462 | 7.00 | 6298 | 1493 | 7.25 | 6538 | 1523 | 7 50 | 6778
8000 1 1373 | 6.70 | 6024 | 1433 | 7 30 | 6495 | 1493 | 7.80 | 6966 | 1523 | 8.05 | 7202 | — — —
8500 | 1410 | 7.60 | 6765 | 1467 | 810 | 7248 | 1524 | 8.70 | 7731 — — — — — —
9000 | 1449 | 8.50 | 7584 | 1503 | 9.00 | 8033 | — — — — — — — — —
9500 | 1488 | 9.40 | 8403 | — — — — — — — — — — — —
10,000 — — — — — — — — — — — — — — —
LEGEND 4. Interpolation is permissible Do not extrapolate.
5. Maximum continuous bhp is 8.7 for 208/230 and 575-v units and
Watts — Input Watts to Motor pui fo Fan 9.5 for 460-v units. The maximum continuous watts are 7915 for
p the 208/230 and 575-v units and 8640 for the 460-v units. Exten-
NOTES: sive motor and drive testing on these units ensures that the full
1. Boldface indicates additional capability of the 460-v motor.
2. Factory shipped motor drive range is 1238 to 1494 rpm. Other
rpms require a field-supplied drive
3 Static pressure losses (i.e , economizer) must be added to exter-
nal static pressure before entering Fan Performance table See
Table 9 for accessory/FIOP static pressure information
horsepower range of the motor can be utilized with confidence.
Using your fan motors up to the watts rating shown will not result
in nuisance tripping or premature motor failure Unit warranty will
not be affected.
Table 7 — Fan Performance Data — 48TJ028
EXTERNAL STATIC PRESSURE (in. wg)
“cm 0.2 0.4 0.6 0.8 0.9 1.0
Rpm | Bhp | Watts | Rpm | Bhp | Watts | Rpm | Bhp | Watts | Rpm | Bhp | Watts | Rom | Bhp | Watts | Rpm | Bhp | Watts
7,500 962 | 3.39 | 3123 | 1039 | 381 | 3507 (1111 | 4.23| 3895 |1179| 466 | 4295 | 1212| 4.89 | 4503 | 1245 511 | 4710
8,000 |1017| 4.04 | 3717 |1091 | 4.48 | 4126 | 1160 | 493| 4536 | 1225| 538| 4954 |1256| 5.62 | 5170 | 1287 | 5.85 | 5386
8,500 |1072| 4.76 | 4385 |1143 | 5.23 | 4818 | 1209 | 5.70 | 5250 |1271| 618| 5688 | 1302 | 6.42 | 5913 |1332| 6.66 | 6137
9,000 |1128| 5.57 | 5129 [1196 | 6.07 | 5587 |1260 | 6 56| 6042 | 1320 | 7.06 | 6501 | 1348 | 7.32 | 6735 | 1377 | 757 | 6968
9,500 |1185| 6.47 | 5955 |1250 | 6.99 | 6437 [13111 7.51 | 6915 | 1369 | 803| 7395 | 1396 | 8.30 | 7638 | 1424 | 8.56 | 7881
10,000 | 1241 | 7.45! 6865 | 1304 | 8.00 | 7372 | 13631 8.55 | 7873 |1419| 909| 8376 |1445 | 9.37 | 86529 | 1472 | 9.64 | 8882
10,500 |1298| 8.54 7865 {1359 | 9121 8396 | 1415| 969| 8921 | 1469 |10.26 | 9446 | 1495 | 10.55 | 9710 | 1521 | 10.83 | 9973
11,000 | 1355| 9.72 | 8956 | 1414 | 10.33 | 9512 | 1469 | 10.93 | 10,062 | 1521 | 11.52 | 10,609 | — — — — — —
11,250 | 1384 | 10.36 | 9540 | 1441 | 10.97 | 10,107 | 1495 | 11.58 | 10,668 | — — — — — — — — —
EXTERNAL STATIC PRESSURE (in. wg)
Ae 1.2 1.3 1.4 1.6 1.8
Rpm | Bhp | Watts | Rom | Bhp | Watts | Rpm | Bhp | Watts | Rpm | Bhp | Watts | Rpm | Bhp | Watts
7,500 | 1309 | 5.58 | 5143 | 1341 | 5.83 | 5370 | 1372 | 6 08 | 5597 | 1434 | 6 59 | 6067 | 1494 | 7.12 | 6558
8,000 | 1349 | 6.33 | 5833 | 1379 | 6.59 | 6065 | 1409 | 6 84 | 6297 | 1467 | 736 | 6779 | — — —
8,500 |1390| 7.17 | 6600 | 1419 | 7.43 | 6839 | 1447 | 7 68 | 7077 | 1504 | 822 | 7571 — —
9,000 | 1433 | 808 | 7446 | 1461 | 8.351 7692 | 1488 | 8 62 | 7938 | — — — — — —
9,500 | 1478 | 910| 8378 | 1505 | 9.37 | 8626 | — — — — — — — — —
10,000 | 1524 | 10.20 | 9396 | 1550 | 10.48 | 9653 | — — — — — — — — —
10,500 — — — — — — — — — — — — — — —
11,000 — — — — — — — — — — — — — — —
11,250 — — — — — — — — — — — — — — —
LEGEND 4. Interpolation is permissible. Do not extrapolate.
Bhp — Brake Horsepower Input to Fan 5 an performance is based on wet coils, clean filters, and casing
Watts — Input Watts to Motor 6. Maximum continuous bhp is 10.2 for 208/230 and 575-v units and
OTES: Ш Ш 11 8 for 460-v units. The maximum continuous watts are 9510 for
1. Boldface indicates additional capability of the 460-v motor. the 208/230 and 575-v units and 11,000 for the 460-v units Ex-
| 2. Factory shipped motor drive range is 1323 to 1579 rpm. Other tensive motor and drive testing on these units ensures that the
\ rpms require a field-supplied drive. full horsepower range of the motor can be utilized with confi-
3 Static pressure losses (i.e , economizer) must be added to exter-
nal static pressure before entering Fan Performance table. See
Table 9 for accessory/FIOP static pressure information.
dence Using your fan motors up to the watts rating shown will
not result in nuisance tripping or premature motor failure. Unit
warranty will not be affected
17
Table 8 — Air Quantity Limits
UNIT 48TJ MINIMUM CFM MAXIMUM CFM
016 4500 7,500
020 5400 9,000
024 6000 10,000
028 7500 11,250
Table 9 — Accessory/FIOP Static Pressure (in. wg)
UNIT UNIT CFM ECONOMIZER HORIZONTAL ADAPTER CURB
ABTJ | VOLTAGE PRESSURE DROP*
PRESSURE INCREASE}
4.000 03 0.68
5.000 05 0 65
016 All 6.000 07 0.60
7.500 10 0.45
6.000 07 0.60
7.200 09 048
020-028 All 9.000 11 030
10.000 12 0.26
11.250 13 024
FIOP — Factory-installed Option
*The static pressure must be added to external static pressure. The result and the evaporator entering-
air cfm should then be used with the fan performance table to determine blower rpm, bhp, and
watts.
+The static pressure must be deducted from external static pressure The result and the evaporator
entering-air cfm should then be used with the Fan Performance table to determine blower rpm, bhp,
and watts.
NOTE: The factory-assembled horizontal adapter curb substantially improves 48TJ016-028 fan
performance (by the amount of static pressure listed).
Base Unit Operation
COOLING, UNITS WITHOUT ECONOMIZER — When
thermostat calls for cooling, terminals G and Y1 are ener-
gized. The indoor (evaporator) fan contactor (IFC) and
compressor contactor no. 1 (C1) are energized and evaporator-
fan motor (IFM), compressor no. 1 (48TJ020-028) or un-
loaded compressor (48TJ016), and condenser fan start. The
condenser-fan motors run continuously while unit is cool-
ing. If the thermostat calls for a second stage of cooling by
energizing Y2, compressor contactor no. 2 (C2) is ener-
gized and compressor no. 2 starts (48TJ020-028), or com-
pressor no. 1 runs fully loaded (48TJO16).
HEATING, UNITS WITHOUT ECONOMIZER
NOTE: The 48TJ016-028 units have 2 stages of heat.
First Stage — All Units — Turn unit power on. Open man-
ual gas line valve. Set thermostat system switch at HEAT
or AUTO. position and set fan switch to AUTO. position
for heating.
First-stage thermostat calls for heat. Time-delay relay for
evaporator fan begins timer sequence. Induced-draft relay
closes, and induced-draft motor starts.
Pressure switch closes and pilot valve no. 1 opens, al-
lowing gas to flow to the first-stage pilot. Spark ignitor
ignites pilot flame. Sensor detects flame and the main gas
valve no. 1 opens. Gas flows to main burners and first-
stage burners ignite. Spark igniter turns off.
When sequence is complete, time-delay relay closes and
evaporator fans start.
Second-Stage — 48TJD016-028 Low-Heat and 48TJEO16
High Heat Units — With an additional heating call, the
second-stage thermostat closes. (The control relay [HR2]
closes during the first stage of operation.) Pilot valve no. 2
opens, and the spark ignitor ignites pilot. The sensor de-
tects a flame and energizes main gas valve coil no. 2, open-
18
wt
ing main gas valve no. 2. Gas flows to the main burners,
and the second-stage burners ignite. The spark ignitor turns
off.
When the second-stage thermostat is satisfied, the second-
stage gas valve closes.
When the first-stage thermostat is satisfied, the first-
stage gas valve closes. The induced-draft motor turns off,
the time delay relay opens, and the timer sequence begins.
When the sequence is complete, the evaporator-fan motor
turns off.
Second-Stage — 48TJE024,028 High-Heat Units — With
an additional heating call, the second-stage thermostat closes.
(The control relay [HR2] closes during the first stage of op-
eration.) The second-stage induced-draft relay closes, and
the second-stage induced-draft motor starts.
The second-stage pressure switch closes and pilot valve
no. 2 opens, allowing gas to flow to the second-stage pilot.
Spark ignitor ignites pilot flame. The sensor detects the flame,
and main gas valve no. 2 opens. Gas flows to main burners
and second-stage burners ignite. Spark ignitor turns off.
When the second-stage thermostat is satisfied, the second-
stage gas valve closes and the second-stage induced-draft
motor turns off.
When the first-stage thermostat is satisfied, the first-
stage gas valve closes. The first-stage induced-draft motor
turns off, the time relay opens, and the timer sequence be-
gins. When the sequence is complete, the evaporator-fan
motor turns off.
COOLING, UNITS WITH ECONOMIZER — Upon a call
for cooling, when outdoor ambient is above the changeover
control setting, the economizer damper moves to VENT
position. The compressors and evaporator and condenser
fans energize and operate as per Cooling, Units Without
Economizer section above.
e
Upon a first call for cooling, when outdoor ambient is
below the changeover control setting, the evaporator fan
starts and the economizer 1s fully open. The compressors
remain off.
Upon a second-stage call for cooling, compressor no. 1
(48TJ020-028) or unloaded compressor (48TJ016) is ener-
gized and mechanical cooling is integrated with econo-
mizer cooling. If the outdoor-air temperature drops below
50 F, a cooling lockout switch prevents the compressors
from running.
When supply-air temperature drops below a fixed set point,
the economizer damper modulates to maintain the temper-
ature at the fixed set point.
A freeze protection thermostat (FPT) is located on the
evaporator coil. It detects frost build-up and locks out
the compressors, allowing the coil to clear. Once frost has
melted, the compressors can be reenergized by resetting the
thermostat.
HEATING, UNITS WITH ECONOMIZER — Outdoor-air
damper stays at VENT position while evaporator fan is
operating.
SERVICE
A WARNING
Before performing service or maintenance operations
on unit, turn off main power switch to unit. Electrical
shock could cause personal injury.
Cleaning — Inspect unit interior at beginning of each
heating and cooling season and as operating conditions re-
quire. Remove unit top panel and/or side panels for access
to unit interior.
MAIN AND PILOT BURNERS — At the beginning of each
heating season, inspect for deterioration or blockage due to
corrosion or other causes. Observe the pilot and main burner
flames through view port (in condenser section), and adjust
if necessary. Refer to Pilot Adjustment or Main Burners
sections on pages 24 and 25.
FLUE GAS PASSAGEWAYS — The flue collector box
and heat exchanger cells may be inspected by removing heat
exchanger access panel (Fig. 4 and 5), flue box cover, and
main burner assembly (Fig. 25). Refer to Main Burners sec-
tion on page 25 for burner removal sequence. If cleaning is
required, remove heat exchanger turbulators (Fig. 26) and
clean all parts with a wire brush.
COMBUSTION-AIR BLOWER — Clean periodically to
assure proper airflow and heating efficiency. Inspect blower
wheel every fall and periodically during heating season. For
the first heating season, inspect blower wheel bi-monthly to
determine proper cleaning frequency.
To inspect blower wheel, remove heat exchanger access
panel. Shine a flashlight into opening to inspect wheel. If
cleaning is required, remove motor and wheel assembly by
removing screws holding motor mounting plate to top of
combustion fan housing (Fig. 25 and 26). The motor and
wheel assembly will slide up and out of the fan housing.
Remove the blower wheel from the motor shaft and clean
with a detergent or solvent. Replace motor and wheel
assembly.
EVAPORATOR COIL — Clean as required with commer-
cial coil cleaner.
19
CONDENSER COIL — Clean condenser coil annually and
as required by location and outdoor-air conditions. Inspect
coil monthly; clean as required.
CONDENSATE DRAIN — Check and clean each year at
start of cooling season. In winter, keep drains and traps
dry.
FILTERS — Clean or replace at start of each heating and
cooling season, or more often if operating conditions re-
quire. Refer to Table 1 for type and size.
NOTE. The 48TJ028 unit requires industrial grade throw-
away filters capable of withstanding face velocities up to
625 fpm. Ensure that replacement filters for the 48TJ028
units are rated for 625 fpm.
OUTDOOR-AIR INLET SCREENS — Clean screens with
steam or hot water and a mild detergent. Do not use dis-
posable filters in place of screens.
IGNITOR IGNITOR
CONTROL CONTROL
PACKNO1 PACKNO 2
INDUCED-DRAFT PRESSURE
MOTOR
SWITCH
- 1... PUE от’. ao
A Te © nu mu me a _
COMBUSTION PRIMARY MAIN
FAN AIR BURNER BOX VALVE VALVE
HOUSING SHUTTER SECTION COVER NO 1 NO 2
Fig. 25 — Typical Gas Heating Section,
2-Stage Units
{(48TJD Units Shown)
COMBUSTION
FAN HOUSING
IGNITOR CONTROL
PACKS
и, № a E
y TURBULATORS
аа. 3
a "e
a
Fig. 26 — Typical Heating Section with Main
Burners Removed
(48TJD Units Shown)
Lubrication
COMPRESSORS — Each compressor is charged with the
correct amount of oil at the factory. The 48TJ016 compres-
sor runs with a slightly low sight glass oil level. Oil level
with compressor off should be about % of sight glass as
shown in Fig. 27.
If oil charge is above V4 sight glass, do not remove any
oil until the compressor crankcase heater has been ener-
gized for at least 24 hours.
FAN SHAFT BEARINGS — For 016 units, bearings are
permanently lubricated. No field lubrication is required. For
020-028 units, lubricate bearings at least every 6 months
with suitable bearing grease. Extended grease line is pro-
vided for far side fan bearing (opposite drive side). Typical
lubricants are given below:
MANUFACTURER LUBRICANT
Texaco Regal AFB-2*
Mobil Mobilplex EP No 1
Sunoco Prestige 42
Texaco Multifak 2
“Preferred lubricant because it contains rust and oxidation inhibitors.
CONDENSER AND EVAPORATOR-FAN MOTOR
BEARINGS — The condenser- and evaporator-fan motors
have permanently-sealed bearings, so no field lubrication is
necessary.
Evaporator Fan Performance Adjustment
(Fig. 28-30) — Fan motor pulleys are factory set for speed
shown in Table 1.
To change fan speeds.
1. Shut off unit power supply.
2. a. 016 only: Loosen belt by loosening carriage nuts hold-
ing motor mount assembly to fan scroll side plates
(A and B).
b. 020-028 only: Loosen nuts on the 2 carriage bolts in
the mounting base. Install jacking bolt and plate un-
der motor base (bolt and plate are shipped in install-
er’s packet). Using bolt and plate, raise motor to top
of slide and remove belt. Secure motor in this posi-
tion by tightening the nuts on the carriage bolts.
3. Loosen movable-pulley flange setscrew (see Fig. 28).
COMPRESSOR SIGHT GLASS
1/4
NORMAL COMPRESSOR
SIGHT GLASS OIL LEVEL
Fig. 27 — 48TJ016 Compressor Sight Glass Oil Level
20
ut
4. Screw movable flange toward fixed flange to increase
speed and away from fixed flange to decrease speed. In-
creasing fan speed increases load on motor. Do not ex-
ceed maximum speed specified in Table 1.
See Table 8 for air quantity limits.
5. Set movable flange at nearest keyway of pulley hub and
tighten setscrew. (See Table 1 for speed change for each
full turn of pulley flange.)
6. Tighten belts (see Belt Tension Adjustment section on
page 21).
To align fan and motor pulleys:
1. Loosen fan pulley setscrews.
2. Slide fan pulley along fan shaft.
3. Make angular alignment by loosening motor from mount-
ing plate.
7
MOVABLE
STRAIGHTEDGE MUST FLANGES
BE PARALLEL
WITH BELT
=I
MOTOR AND FAN
SHAFTS MUST BE
PARALLEL
PULLEYS
SETSCREWS
FIXED FLANGES
SINGLE-GROOVE
—
Fig. 28 — Evaporator-Fan Alignment and
Adjustment
Evaporator Fan Service and Replacement
48TJO16 UNITS (See Fig. 29)
NOTE: To remove belts only, follow Steps 1-6.
1. Remove filter and supply-air section panels.
2. Remove unit top cover
3. Loosen carriage nuts A and B holding motor mount as-
sembly to fan scroll side plates.
Loosen screw C.
Rotate motor mount assembly (with motor attached) as
far as possible away from evaporator coil.
Remove belt.
7. Rotate motor mount assembly back past original posi-
tion toward evaporator coil.
Remove motor mounting nuts D and E (both sides).
9. Lift motor up through top of unit.
10. Reverse above procedure to reinstall motor.
11. Check and adjust belt tension as necessary.
> ME
oC
UNIT TOP COVER
MOTOR MOUNT
ASSEMBLY
PULLEY
\
FAN SCROLL
SIDE PLATES
| o
DRAIN U
CONNECTION
\V
Fig. 29 — 48TJ016 Evaporator-Fan
Motor Adjustment
48TJ020-028 UNITS (See Fig. 30) — The 48TJ020-028
units use a fan motor mounting system that features a slide-
out motor mounting plate. To replace or service the motor,
slide out the bracket.
1. Remove the evaporator-fan access panel and the heat-
ing control access panel.
2. Remove the center post (located between the evapora-
tor fan and heating control access panels) and all screws
securing it,
3. Loosen nuts on the 2 carriage bolts in the motor mount-
ing base
4. Using jacking bolt under motor base, raise motor to
top of slide and remove belt. Secure motor in this po-
sitton by tightening the nuts on the carriage bolts.
5. Remove the belt drive.
6. Remove jacking bolt and tapped jacking bolt plate.
7. Remove the 2 screws that secure the motor mounting
plate to the motor support channel.
8. Remove the 3 screws from the end of the motor sup-
port channel that interfere with the motor slide path.
9. Slide out the motor and motor mounting plate.
10. Disconnect wiring connections and remove the 4 mount-
ing bolts.
11. Remove the motor.
12. To install the new motor, reverse Steps 1-10.
21
FAN PULLEY CENTER POST
BELT
MOTOR PULLEY
SLIDING MOTOR
MOTOR PLATE
MOTOR
MOUNTING
PLATE
©.
%
&3
\
MOTOR SUPPORT 7
CHANNEL JACKING BOLT
NOTE: A 3%-in bolt and threaded plate are included in the install-
er's packet. They can be added to the motor support channel below
the motor mounting plate to aid in raising the motor
Fig. 30 — 48TJ020-028 Evaporator-Fan Motor
Section
AWN
«== SEE NOTE
JACKING PLATE
Belt Tension Adjustment — To adjust belt tension:
1. Loosen fan motor bolts.
2. a. 016 Units:
Move motor mounting plate up or down for proper
belt tension (7 in. deflection with one finger).
b. 020-028 Units:
Turn motor jacking bolt to move motor mounting plate
up or down for proper belt tension (3% in. deflection
at midspan with one finger [9 Ib force]).
3. Tighten nuts.
4. Adjust bolts and nut on mounting plate to secure motor
in fixed position.
Condenser-Fan Adjustment
48TJ016,020 UNITS (Fig. 31)
|. Shut off unit power supply.
2. Remove access panel(s) closest to the fan to be
adjusted.
3. Loosen fan hub setscrews.
4. Adjust fan height on shaft using a straightedge placed
across the fan orifice,
5. Tighten setscrews and replace panel(s).
6. Turn on unit power.
48TJ024,028 UNITS (Fig. 32)
1. Shut off unit power supply.
2. Remove fan top-grille assembly and loosen fan hub screws.
3. Adjust fan height on unit, using a straightedge placed
across the fan orifice.
4. Tighten setscrews and replace rubber hubcap to prevent
hub from rusting to motor shaft.
5. Fill hub recess with permagum if rubber hubcap is
missing.
025
0.62 +8 €
Fig. 31 — Condenser Fan Adjustment, 48TJ016,020
00020202
RAIN
SHIELD
Fig. 32 — Condenser-Fan Adjustment, 48TJ024,028
Economizer Adjustment — See Tables 10 and 11
for checkout and enthalpy simulation. Make certain the
outdoor-air damper is fully closed and the return-air damper
is fully open before completing the following steps:
|. Turn on power to the unit.
2. Turn the thermostat fan switch to the ON position. The
damper will go to the vent position.
3. Adjust the vent position with the minimum position ad-
justment on the economizer motor control module. See
Fig. 20.
4. Set the system selector switch to COOL position and
set the cooling temperature selector to its lowest
setting.
NOTE: The Cooling mode may also be simulated by
removing the thermostat wires from terminals Y1 and
Y2 and installing a jumper between terminals R and
Y1. Refer to unit label diagram for terminal locations.
5. Set the outdoor-air thermostat (OAT), located in the
economizer section of the unit to 75 F.
6. If the outdoor temperature is below 75 F, the econo-
mizer will control the mixed air with the mixed-air sen-
sor. If the outdoor air is above 75 F, place a jumper
around the contacts of the OAT.
7. Jumper terminal T to terminal T1 on the module (see
Fig. 20). The economizer will go to the full open po-
sition. The outdoor-air damper will go to the full open
position, and the return-air damper will go to the full
closed position.
8. Adjust mechanical linkage, if necessary, for correct po-
sitioning. If may be necessary to remove the filters to
adjust the linkage.
a*
9. Remove the jumper from around the contacts of the
OAT if installed in Step 6. Remove the jumper from
terminals T and TIL installed in Step 7.
10. If the Cooling mode was simulated to operate the unit
in Step 4, remove the jumper and reconnect the ther-
mostat wires to terminals Y1 and Y?
Power Failure — Dampers have a spring return. In event
of power failure, dampers will return to fully closed posi-
tion until power is restored. Do not manually operate damper
motor.
Table 10 — Economizer Checkout Procedures
TEST PROCEDURE
A. Disconnect power at
TR and TR1
Disconnect jumper
between P and
Pt See Fig. 20.
. Jumper TR to 1.
. Jumper T1 to T.
. Disconnect outdoor-air
thermostat connections
from So and +
Factory-installed
800 ohm resistor
should remain connected
to Sy and +.
E. Reconnect power to
terminals TR and TR1.
RESULTS
oOo
1. LED (light-emitting diode)
should be off.
2. Motor is in closed position
TEST PROCEDURE
Disconnect factory-installed
resistor from terminals
Sg and +
RESULTS
1 LED (light-emitting diode)
should be on.
2. Motor drives toward open.
Table 11 — High and Low Outdoor-Air Simulation
TEST PROCEDURE
A. Reconnect factory-installed
800 ohm resistor
between terminals
Sp and +.
B. Connect 1200 ohm
checkout resistor between
terminals Sg and +.
C. Turn set point potentiometer
to position A.
RESULTS
Low outdoor-air test results:
1. LED (light-emitting diode)
should be on.
2 Motor drives toward open.
D. Turn set point potentiometer
to position D
E Disconnect 1200 ohm
checkout resistor.
High outdoor-air test results:
1. LED should be off.
2 Motor drives toward closed
Refrigerant Charge — Amount of refrigerant charge
is listed on unit nameplate and in Table 1. Refer to Carrier
GTAC II; Module 5; Charging, Recovery, Recycling, and
Reclamation section for charging methods and procedures.
Unit panels must be in place when unit is operating dur-
ing charging procedure.
NOTE: On 020,024 units, do not adjust charge until after
compressors have been running for at least 20 minutes and
pressures and temperatures have stabilized.
NO CHARGE — Use standard evacuating techniques. Af-
ter evacuating system, weigh in the specified amount of
refrigerant (refer to Table 1).
LOW CHARGE COOLING — Using appropriate cooling
charging chart (see Fig. 33-36), add refrigerant until con-
ditions of the appropriate chart are met. Note that charging
chart is different from those normally used. Chart is based
on charging units to correct superheat for various operating
conditions. An accurate pressure gage and temperature sens-
ing device are required. Connect temperature sensing de-
vice to service port on suction line and insulate it so that
outdoor ambient temperature does not affect reading. Indoor-
air cfm must be within normal operating range of unit.
TO USE COOLING CHARGING CHART — Take out-
door ambient temperature and read the suction pressure gage.
Refer to appropriate chart to determine correct suction tem-
perature. If suction temperature is high, add refrigerant. If
suction temperature is low, carefully reclaim some of the
charge. Recheck suction pressure as charge 1s adjusted.
CIRCUIT 1
OUTDOOR TEMP
F*
-J
<
(9ISd> 3#NSSI4d 3NIT NOILONS
un
>
20 30 40 50 60 80
SUCTION LINE TEMPERATURE CF)
SUCTION LINE PRESSURE (PSIG)
20 30 40 50 50 70 80
SUCTION LINE TEMPERATURE (CF)
Fig. 33 — Cooling Charging Chart — 48TJ016
CIRCUIT 2
un
=
<
-
QQ
=
at
=
m
A
Un
un
<
x
m
m
©
wm
o
Sr
30
20 70 80
30 40 50 60
SUCTION LINE TEMPERATURE (F)
Fig. 34 — Cooling Charging Chart — 48TJ020
23
SUCTION LINE PRESSURE (PSIG)
SUCTION LINE PRESSURE (PSIG)
CIRCUIT 1
20 30 40 50 60 80
SUCTION LINE TEMPERATURE (F)
SUCTION LINE PRESSURE (PSIG
20
CIRCUIT 2
OUTDOOR TEMP
F
30 40 50 60 70 80
SUCTION LINE TEMPERATURE (F)
Fig. 35 — Cooling Charging Chart — 48TJ024
CIRCUIT 1 AND 2
20 30 40 50 60 70 80
SUCTION LINE TEMPERATURE (F)
Fig. 36 — Cooling Charging Chart — 48TJ028
24
Pilot Light — If pilots do not light as described in Start-
Up, Gas Heat section on page 15, be sure that pilot orifice
is not obstructed, then check for spark ignitor malfunctions
as follows:
1.
2.
3.
Shut off control supply power to ignitor control pack
(ICP).
Check that spark gap is / in. = 132 inch.
Check that ICP is securely grounded.
Check that high-voltage lead is securely connected be-
tween ICP and electrode body.
. Restore power to ICP. Check that 24 v is supplied
to terminal of ICP.
Check unit label diagram for correct terminal usage if
any wires are removed.
Pilot Adjustment
% 1.
2.
3.
4.
Set system selector switch at OFF position to shut off
unit. Turn off power to unit.
Remove screw cap cover on pilot gas valve to expose
adjusting screw (See Fig. 37).
Turn valve knobs to pilot position.
Turn on power to unit. Set system selector switch to
HEAT position and set thermostat to a setting that will
call for heat. Pilot ignites.
. With a small screwdriver, turn adjustment screw until
flame fully engulfs sensor. Flame can be observed through
view port (Fig. 38).
Replace cap on pilot gas valve. Turn off power to unit.
Return valve(s) to original position.
. Check for proper burner operation by cycling the burn-
ers. Wait 30 seconds between burner cycles.
Check that all unit panels are in place before leaving
unit.
Gas Valve Adjustment
NATURAL GAS — The gas valve opens and closes in re-
sponse to the thermostat or limit control.
When power 1s supplied to valve terminals 3 and 4, the
pilot valve opens to the preset position. When power 1s sup-
plied to terminals 1 and 2, the main valve opens to its pre-
set position.
The regular factory setting 1s stamped on the valve body
(3.5 in. wg).
To adjust regulator:
1. Set thermostat at setting for no call for heat.
2. Turn main gas valve to OFF position.
3. Remove %-in pipe plug from manifold or gas valve pres-
sure tap connection. Install a suitable pressure-measuring
device.
4. Set main gas valve to ON position.
Set thermostat at setting to call for heat.
6. Remove screw cap covering regulator adjustment screw
(See Fig. 37).
7. Turn adjustment screw clockwise to increase pressure or
counterclockwise to decrease pressure.
8. Once desired pressure is established, set thermostat set-
ting for no call for heat, turn off main gas valve, re-
move pressure-measuring device and replace &-in. pipe
plug and screw cap.
in
Main Burners — For most applications, main burners
are factory set and should require no adjustment. However,
if burner adjustment is necessary:
1. Perform pilot adjustment.
2. Turn gas valve to ON position. Allow unit to operate at
least 15 minutes with burner access panel in place.
3. Remove access panel.
4. Loosen primary air shutter (Fig. 38) and adjust to a min-
imum opening of % inch.
5. Retighten primary air shutter and reinstall access panel.
To check ignition of main burners and fan switch oper-
ation, move thermostat dial above and below room temper-
ature several times, pausing at least one minute between
cycles.
MAIN BURNER REMOVAL
1. Shut off (field-supplied) manual main gas valve.
2. Shut off power to unit.
3. Remove unit control box/gas valve access panel, burner
section access panel, and center post (Fig. 4 and 5).
REGULATOR
ADJUSTMENT
SCREW
(REMOVE
COVER)
PILOT ADJUSTMENT SCREW
(REMOVE COVER)
Fig. 37 — Gas Valve
25
PRIMARY AIR
SHUTTER
пс e ” adel IT
ERI, dl Cuve rw
E OE 0 pe
FLUE BOX
[OVER
EE.
N BT - a
CR er)
Cr
RC I
un a
NN
NU
Mp
aa
Mea Ha
LA
oan ra
Da EE MAIN BORNER
Jad aE te
Fig. 38 — Typical Heating Section
4. Disconnect pilot ignitor and pilot proving sensor leads
at ICP, rollout switch leads at switch, and pilot tube gas
connection(s) at the pilot orifice.
5. Disconnect gas connection(s) from between gas valve(s)
and main burners.
6. Remove 2 screws securing burner assembly to base unit.
NOTE: For 48TJE024 and 028 units only: Remove ac-
cess plate from base rail.
7. Slide burner assembly out of unit.
Filter Drier — Replace whenever refrigerant system is
exposed to atmosphere.
Protective Devices
COMPRESSOR PROTECTION
Overcurrent (016 and 028) — Each compressor has one man-
ual reset, calibrated trip, magnetic circuit breaker. Do not
bypass connections or increase the size of the circuit breaker
to correct trouble. Determine the cause and correct it before
resetting the breaker.
NOTE: The 48TJ020 and 024 units have overcurrent pro-
tection inherent in the compressor.
Overtemperature — Each compressor has an internal pro-
tector to protect it against excessively high discharge gas
temperatures.
Crankcase Heater — Each compressor has a 125-watt crank-
case heater to prevent absorption of liquid refrigerant by oil
in the crankcase when the compressor is idle. Since power
for the crankcase heaters 1s drawn from the unit incoming
power, main unit power must be on for the heaters to be
energized.
IMPORTANT: After a prolonged shutdown or serv-
ice job, energize the crankcase heaters for 24 hours
before starting the compressors.
Compressor Lockout — If any of the safeties (high-, low-
pressure, freeze protection thermostat, compressor internal
thermostat) trip, or if there is loss of power to the compres-
sors, the cooling lockout (CLO) will lock the compressors
off. To reset, manually move the thermostat setting.
EVAPORATOR FAN MOTOR PROTECTION — A man-
ual reset, calibrated trip, magnetic circuit breaker protects
against overcurrent. Do not bypass connections or increase
the size of the breaker to correct trouble. Determine the
cause and correct it before resetting the breaker.
CONDENSER-FAN MOTOR PROTECTION — Each
condenser-fan motor is internally protected against
overtemperature.
HIGH- AND LOW-PRESSURE SWITCHES — If either
switch trips, or if the compressor overtemperature switch
activates, that refrigerant circuit will be automatically locked
out by the CLO. To reset, manually move the thermostat
setting.
FREEZE PROTECTION THERMOSTAT (FPT) — An
FPT is located on the evaporator coil. It detects frost
buildup and turns off the compressor, allowing the coil to
clear. Once the frost has melted, the compressor can be
reenergized.
Relief Devices — All units have relief devices to pro-
tect against damage from excessive pressures (i.e., fire).
These devices protect the high and low side.
Control Circuit, 24-V — This control circuit is pro-
tected against overcurrent by a 3.2 amp circuit breaker. Breaker
can be reset. If it trips, determine cause of trouble before
resetting.
Replacement Parts — A complete list of replace-
ment parts may be obtained from any Carrier distributor
upon request.
LEGEND
Fig. 39 — Typical Wiring Schematic
Fig. 40 — Typical Component Arrangement
AHA — Adjustable Heat Anticipator 1ЕМ — Indoor (Evaporator) TH — Thermostat Heating
BKR W/AT — Breaks with Amp Turns Fan Motor TRAN — Transformer
С — Contactor, Compressor IFR — Indoor (Evaporator)
CB — Circuit Breaker Fan Relay {> Terminal (Marked)
CC — Cooling Compensator IP — Internal Protector
CH — Crankcase Heater L — Light O) Terminal (Unmarked)
ero — Compressor Lockout Switch LOS — Lockout Relay n
L — Compressor Lockout Switc — Low-Pressure Switc
COMP — Combressor Motor LS — Limit Switch | | Terminal Block
CR — Control Relay MAT — Mixed-Air Thermostat
CT — Current Transformer MGV — Main Gas Valve o Splice
DM — Damper Motor NEC — National Electrical Code
DU — Dummy Terminal OAT — Outdoor-Air Thermostat <_>® Splice (Marked)
EQUIP — Equipment OFC — Outdoor (Condenser)
FPT — Freeze Protection Fan Contactor ZN Splice (Field Supplied)
FU Thermostat OFM — Qutdoor (Condenser) -
— Fuse an Motor Fa iri
GND — Ground PGV — Pilot Gas Valve ciory Wiring
HPS — High-Pressure Switch PL — Plug Assembly __ Field Control Wiring
HR — Heat Relay PRI — Primary
HV — High Voitage PS — Pressure Switch mew Field Power Wiring
| — lgnitor QT -— Quadruple Terminal |
ICP — lgnitor Control Pack R — Relay ——[ Accessory or Optional Wiring
IDM — Induced-Draft Motor RS — Rollout Switch
IDR — Induced-Draft Relay SN — Sensor 10 Indicate Common Potential Only,
IFC — Indoor (Evaporator) SW — Switch Not To Represent Wiring
Fan Contactor TB — Terminal Block
IFCB — Indoor (Evaporator) TC — Thermostat Cooling
Fan Circuit Breaker TDR — Time Delay Relay
NOTES:
1 Compressor and fan motors thermally protected; 3-phase motors
protected against primary single-phasing conditions.
2. If any of the original wire furnished must be replaced, it must be
replaced with type 90 C wire or its equivalent.
3 Jumpers are omitted when unit is equipped with economizer.
4. Set thermostat heat anticipator(s):
UNIT 48TJ W1 W2 VOLTAGE
98 ‚44 208/230, 575
016-028 1.20 44 460
26
5. CB must-trip amps are equal to or less than 140% full load amps.
6. Number(s) indicates the line location of used contacts. A bracket
over (2) numbers signifies a single-pole, double-throw contact
An underlined number signifies a normally-closed contact. A plain
(no line) number signifies a normally-open contact
7. The CLO locks out the compressor to prevent short cycling on
compressor overload and safety devices. Before replacing CLO,
check these devices.
15
FIELD _
208/230-3-60 POWER _
SUPPLY _
Ç1 cLo!
nio mae
r—BLK BL
e YEL a —— ve COMPI
181 au BLU BLU
C2 CLO2
- D— —-ZK—=———HELK BLK — 614 KID AYA-—BLK
2 — YEL: YEL — СН YEL COMP2
- 13 PE] BLU- BLU BLU
IFCB [FC
EQUIP GND
LL. NBLK— 0-62 BL HKD BLK
«-1 ©
уе боба YEL —7818 YEL LEN
BLU 36 NI BLU BLU «CD
BLU—— BLK]
EL orc
BL SH HID < BLK T
YEL EH HI— YEL OFHI
BLU BLU
BLK
YEL OF M2
7 BLU
BLU ve
230V , ! oR YEL-9— BLU LOM
ORN | BLK YEL ELK— 2H H1)-erN-0—ELk
Fig. 39 — Typical Wiring Schematic (48TJ020-028 Shown)
27
L2
3 WIRE COM BUS TO OTHER COMMUNICATING
|
|
|
|
|
|
|
|
|
|
|
THERMOSTATS |
|
|
|
|
|
|
|
|
|
|
|
HR2
GHKD)——— ten
PL1-11
Г e FACTORY ONLY
|
|
|
|
Od TU de CRD
24VAC — ——|—
(COMMON)
24 VAC (R)
LOAD IS 1 AMP AT 24 VI(SEE NOTE 4)
|
|
|
TSR-0t RELAY PACK (MAXIMUM CONTACT |
|
| (NOTE 3)
|
(OTE 6)
ALI-9
PL16
| — — — a PM
ECONOMIZER OPTION/ACCESSORY
RESISTOR
CLS
Oe WT
PK
Нет
»
»
MIXED AIR
SENSOR
TOR SEQUENCE CHART
0 0 2 HIN
> 30 SEC 90-150 secta
| [490-150 SEC |
(BLACK DENOTES CLOSED CONTACTS) I |
Fig. 39 — Typical Wiring Schematic (48TJ020-028 Shown) (cont)
ON y
OFF
28
CONTROL BOX ес!
| OL 80% Го а] о [об DOS
(0) 00| С 0 О DOM
CLO 1 cLO 2 DM Do DO
DO
( | D ©
O oD | | ate | | aie ero ©
o al oca lios D @ Y DI @
QD Y | @ DD a ey a т ©
(108 e-vEL+—COM — (OH
# 4 e-oRN-—230 TRANI| cry
@-RED{— 208 YEL
—Aikj-460 G9)
Ч
те!
I | '
| , IT EQUIP GND
+ + Хх Ny 6
i |
ORO I ) | !
1
[FCB ! I Fi
| ! 1 TB2
€) SD N pa {R] M1] M2] (61 [3 X
| i y LL.
ИЕ
FIELD POWER WIRING FIELD CONTROL WIRING
1 11
PL1-R CD io! я
\ 3 DISCONNECT PER NEC I
6566 Ce enn a
{0 © С) GRN-YELY En ©
MILE) -
DO E ©
COMP
e= EAT Ая 1 182
GAS SECTION
ey EY
@ ® ®
D ‘= © æ En
ps @O ® {В
© & т GRN-YEL кн GRN-YEL
| Ey ®
© BLU
oO LS1 © BLK ?
7
RS
E m © o o
ECONOMIZER OPTION/ACCESSORY
PGV2
6
9,
o
PLI-R вск PEN ai DM
BLU +
OD F y L lp À
[900] | fura ET
DOS о
7 O æ® RESISTOR av+—— YN ,
La
| E
UR) PNK, -
MAT RA] T1 i
8)
=
=
=
co
PNK
| —_ ми — Г} рн ня 1
Fig. 40 — Typical Component Arrangement (48TJ020-028 Shown)
29
PACKAGED SERVICE TRAINING
equipment discussed in this manual. Product programs cover:
® Unit Familiarization e Maintenance
e Installation Overview e Operating Sequence
Our packaged service training programs provide an excellent way to increase your knowledge of the ®
A large selection of product, theory, and skills programs is available. All programs include a video
cassette and/or slides and a companion booklet. Use these for self teaching or to conduct full training
sessions.
For a free Service Training Material Catalog (STM), call 1-800-962-9212. Ordering instructions are
included.
wt
Copyright 1994 Carrier Corporation
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book | 1 PC 111 Catalog No. 564-836 Printed in U.S A. Form 48TJ-7SI Pg 30 4-94 Replaces: 48TJ-2SI
Tab Ha
START-UP CHECKLIST
MODEL NO.: SERIAL NO.:
DATE: TECHNICIAN:
PRE-START-UP:
[] VERIFY THAT ALL PACKING MATERIALS HAVE BEEN REMOVED FROM UNIT
[] REMOVE ALL SHIPPING HOLDDOWN BOLTS AND BRACKETS PER INSTRUCTIONS
[] VERIFY INSTALLATION OF ECONOMIZER HOOD
[] VERIFY INSTALLATION OF EXHAUST HOOD
[] VERIFY THAT CONDENSATE CONNECTION IS INSTALLED PER INSTRUCTIONS
[] VERIFY THAT ALL ELECTRICAL CONNECTIONS AND TERMINALS ARE TIGHT
[| CHECK GAS PIPING FOR LEAKS
[] CHECK THAT INDOOR-AIR FILTER IS CLEAN AND IN PLACE
[] VERIFY THAT UNIT IS LEVEL
[] CHECK FAN WHEEL AND PROPELLER FOR LOCATION IN HOUSING/ORIFICE, AND VERIFY SETSCREW
IS TIGHT
[] VERIFY THAT FAN SHEAVES ARE ALIGNED AND BELTS ARE PROPERLY TENSIONED
START-UP
ELECTRICAL
SUPPLY VOLTAGE 11-12 L2-L3 L3-L1
COMPRESSOR AMPS — COMPRESSOR NO. 1 Ll L2 L3
— COMPRESSOR NO. 2 LI L2 L3
SUPPLY FAN AMPS EXHAUST FAN AMPS
TEMPERATURES
OUTDOOR-AIR TEMPERATURE F DB (Dry Bulb)
RETURN-AIR TEMPERATURE F DB Е WB (Wet Bulb)
COOLING SUPPLY AIR в
GAS HEAT SUPPLY AIR LF
PRESSURES
GAS INLET PRESSURE IN. WG
GAS MANIFOLD PRESSURE STAGE NO. | IN. WG STAGE NO. 2 IN. WG
REFRIGERANT SUCTION CIRCUIT NO. 1 PSIG CIRCUIT NO. 2 PSIG
REFRIGERANT DISCHARGE CIRCUIT NO. 1 PSIG CIRCUIT NO. 2 PSIG
[] VERIFY REFRIGERANT CHARGE USING CHARGING CHARTS ON PAGES 23 AND 24
GENERAL
[] ECONOMIZER MINIMUM VENT AND CHANGEOVER SETTINGS TO JOB REQUIREMENTS
Copyright 1994 Carrier Corporation
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book|1 PC 111 Catalog No 564-836 Printed in U.S.A Form 48TJ-7SI CL-1 4-94 Replaces: 48TJ-2S1
Tab a
1
$
1
1
1
CUT ALO
"
- - - - - - Г] - - - - = - - = - - - - - - - - - - - - - - - - - -
A

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