Bryant 581B User Manual
installation, start-up and
service instructions
SINGLE PACKAGE ROOFTOP
GAS HEATING/ELECTRIC COOLING UNITS
CONTENTS
Page
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . . . . 1
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-33
I. Step 1 — Provide Unit Support. . . . . . . . . . . . . . . . . 1
II. Step 2 — Field Fabricate Ductwork . . . . . . . . . . . . . 2
III. Step 3 — Determine Location of Drain Line
and External Trap. . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
IV. Step 4 — Rig and Place Unit. . . . . . . . . . . . . . . . . . . 4
V. Step 5 — Install Flue Hood . . . . . . . . . . . . . . . . . . . . 4
VI. Step 6 — Install Gas Piping . . . . . . . . . . . . . . . . . . . 4
VII. Step 7 — Make Electrical Connections . . . . . . . . . . 9
VIII. Step 8 — Adjust Factory-Installed Options. . . . . . 13
IX. Step 9 — Adjust Evaporator-Fan Speed . . . . . . . . 22
PRE-START-UP. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34-37
SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38-44
TROUBLESHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . . . .45-49
INDEX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
START-UP CHECKLIST . . . . . . . . . . . . . . . . . . . . . . . . . . CL-1
SAFETY CONSIDERATIONS
Installation and servicing of air-conditioning equipment can
be hazardous due to system pressure and electrical components. Only trained and qualified service personnel should
install, repair, or servic e air-conditioning equipment.
Untrained personnel can perform basic maintenance functions of cleaning coils and filters and replacing filters. All
other operations should be p erformed by tra ined servic e personnel. When working on air-conditioning equipment,
observe precautions in the literature, tags and labels
attached to the unit, and other safety precautions that may
apply.
Follow all safety codes. Wear safety glasses and work gloves.
Use quenching cloth for unbrazing operations. Have fire
extinguishers available for al l brazing operations.
CAUTION: Ensure voltage listed on unit data plate
agrees with electrical supply provided for the unit.
WARNING: Disconnect gas piping from unit when
leak testing at pressure greater than
greater than
ing in hazardous condition. If gas valve is subjected to
pressure greater than
use. When pressure testing field-supplied gas piping at
pressures of
piping must be isolated by manually closing the gas
valve(s).
1
/2 psig will cause gas valve damage result-
1
/
psig, it must be replaced before
2
1
/2 psig or less, a unit connected to such
1
/2 psig. Pressures
581B
Dura
Cancels: II 581B-36-6 II 581B-36-7
WARNING: Before performing service or maintenance operatio ns on u nit , tu rn of f ma i n po wer sw itch to
unit. Electrical shock could cause personal injury.
Unit is shipped in the vertical configuration. To convert to
horizontal application, remove side duct opening covers.
Using the same screws, insta ll covers on vertical duct o penings with the insulation-side down. Seals around duct openings must be tight. See Fig. 1.
I. STEP 1 — PROVIDE UNIT SUPPORT
A. Roof Curb
Assemble and install acce ssory roof curb in accordance with
instructions shipped with cu rb. See Fig. 2. Install insulati on,
cant strips, roofing felt, and cou nter fla shin g as sh own. Duct-
work must be attached to curb. If gas is to be routed through
the curb, attach the accessory thru-the-curb service connection plate to the ro of curb in accordance with the a ccessory
installation instructions. Connection plate must be installed
before unit is set in roof curb.
IMPORTANT: The gasketing of the unit to the roof curb is critical for a watert ight seal . Inst all gas ket suppl ied with t he roo f
curb as shown in Fig. 2. Improperly applied gasket can also
result in air or water leaks and poor unit performance.
Curb should be leve l. Th is is ne ce ss ary f or un it d ra in t o func tion properly. Unit leveling tolerances are shown in Fig. 3.
Refer to Accessory Roof Curb Installation Instructions for
additional information as required.
B. Slab Mount (Horizontal Units Only)
Provide a level concrete slab that extends a minimum of 6 in.
beyond unit cabinet. Install a gravel apron in front of condenser coil air inlet to prevent grass and foliage from
obstructing airflow.
NOTE: Horizontal units may be installed on a roof curb if
required.
C. Alternate Unit Support
A non-combustible sleeper rail can be used in the unit curb
support area. If sleeper rails cannot be used, support the long
sides of the unit wi th a minimum of 3 equ ally spaced 4- in. x
4-in. pads on each side.
Pac
INSTALLATION
Plus Series
Sizes 036-072
3 to 6 Tons
10/1/05
II. STEP 2 — FIELD FABRICATE DUCTWORK
On vertical units, secure all ducts to roof curb and building
structure. Do not connect ductwork to unit. For hor izon tal
applications, field-supplied flanges should be attached to
horizontal discharge openings and all ductwork secured to
the flanges. Insulate and weatherproof all external ductwork, joints, and roof openings with counter flashing and
mastic in accordance with applicable codes.
Ducts passing through a n unc ondit i one d spa ce must be insulated and covered with a vapor barrier.
If a plenum return is used on a vertical unit, the return
should be ducted through the roof deck to comply with applicable fire codes.
A minimum clearance is not required around ductwork. Cabinet return-air static pressure (a negative condition) shall
not exceed 0.35 in. wg with economizer or 0.45 in. wg without economizer.
These units are designed for a minimum continuous returnair temperature in heating of 50 F (dry bulb), or an intermittent operati on down to 45 F (dry bulb), suc h as when used
with a night set-back thermostat.
To operate at lower return-air temperatures, a field-supplied
outdoor-air temperature control must be used to initiate both
stages of heat when the temperature is below 45 F. Indoor
comfort may be compromised when these lower air temperatures are used with insufficient heating temperature rise.
III. STEP 3 — DETERMINE LOCATION OF DRAIN LINE AND
EXTERNAL TRAP
The unit’s
3
/4-in. condensate drain connecti ons are locate d on
the bottom and end of the unit. Unit discharge connections do
not determine the use of drain conn ections ; either drain connection can be used with vertical or horizontal applications.
When using the standard end drain connection, make sure
the plug in the alternate bottom connection is tight before
installing the unit.
To use the bottom drain connection for a roof curb installation, relocate the factory-installed plug from the bottom connection to the end connection. The center drain plug looks
like a star connection, however it can be removed with a
1
/2-in. socket drive extens ion. See Fig. 4. The piping for the
condensate drain and external trap can be completed after
the unit is in place.
All units must have an external trap for condensate drainage. Install a trap at least 4 in. deep and protect against
freeze-up. See Fig. 5. If drain line is installed downstream
from the external trap, pitch the line away from the unit at
1 in. per 10 ft of run. Do not use a pipe size smaller than the
unit connection.
Fig. 1 — Horizontal Conversion Panels
—2—
1′-4″
[406]
D ALT
DRAIN
HOLE
13/4″
[44.5]
GAS POWER CONTROL
3
3
/4″
[19] NPT
1
/2″
[12.7] NPT
[19] NPT
3
3
/4″
CONNECTOR
PKG. ACCY.
BC
CRBTMPWR001A01
CRBTMPWR002A01 1
CRBTMPWR003A01
1′-9
11
[551]
/16″
CRBTMPWR004A01
/4″ [19] NPT
1
/4″ [31.7]
/4″ [19] NPT
1
1
/4″ [31.7]
1
/2″
[12.7]
1
/2″
[12.7]
ACCESSORY
PWR
1
/2″
[12.7]
ROOF CURB
ACCESSORY
CRRFCURB001A01
CRRFCURB002A01
NOTES:
1. Roof curb accessory is shipped disassembled.
2. Insulated panels.
3. Dimensions in [ ] are in millimeters.
4. Roof curb: galvanized steel.
5. Attach ductwork to curb (flanges of duct rest on
curb).
6. Service clearance: 4 ft on each side.
A UNIT SIZE
1′-2″
[356]
2′-0″
[610]
581B036-072
7. Direction of airflow.
8. Connector packages CRBTMPWR001A01 and
002A01 are for thru-the-curb type gas. Packages
CRBTMPWR003A01 and 004A01 are for thru-thebottom type gas connections.
Fig. 2 — Roof Curb Details
—3—
MAXIMUM ALLOWABLE
DIFFERENCE (in.)
A-B B-C A-C
0.5 1.0 1.0
Fig. 3 — Unit Leveling Tolerances
DRAIN PLUG
NOTE: Drain plug is shown in factory-installed position.
DRAIN PLUGHORIZONTAL
Fig. 4 — Condensate Drain Pan
NOTE: Trap should be deep enough to offset maximum unit static dif-
ference. A 4-in. trap is recommended.
Fig. 5 — Condensate Drain Piping Details
IV. STEP 4 — RIG AND PLACE UNIT
Inspect unit for transportation damage. File any claim with
transportation agency. Keep unit upright and do not drop.
Spreader bars are not required if top crating is left on unit.
Rollers may be used to move unit across a roof. Level by
using unit frame as a reference. See Table 1 and Fig. 6
for additional information. Operating weight is shown in
Table 1 and Fig. 6.
Lifting holes are provi ded in base rails as shown in Fig. 6
and 7. Refer to rigging instructions on unit .
A. Positioning
Maintain clearan ce around and above un it to provide minimum distance from combustible materials, proper airflow,
and service access. See Fig. 7.
Do not install unit in an indoor location. Do not locate unit
air inlets near exhaust vents or other sources of contaminated air.
Be sure that unit is installed so that sn ow will not b lock the
combustion intake or flue outlet.
Unit may be installed directly on wood flooring or on Class
A, B, or C roof-covering material when roof curb is used.
Although unit is weatherproof, guard against water from
higher level runoff and overhangs.
Position unit on roof curb so that the following clearances are
maintained:
1
/4 in. clearance betwe en the roof curb and the
base rail insi de the fr ont an d rear, 0.0 in. clearance betwe en
the roof curb and the base rail inside on the duct end of the
unit. This will result i n the distance between the roof cu rb
and the base rail inside on the condenser end of the unit
being approximately equal to Fig. 2, section C-C.
Locate mechanical draft system flue assembly at least 48 in.
from an adjacent building or combustible material. Units
having accessory flue discharge deflector require only 18 in.
clearance. When unit is located adjacent to public walkways,
flue assembly must be at least 7 ft above grade.
Flue gas can deteriorate building materials. Orient unit so
that flue gas will not affect building materials.
Adequate combustion and ventilation air space must be provided for proper operation of this equipment. Be sure that
installation complies with all local codes and Section 5.3, Air
for Combustion and V entilat ion per NFGC (National F uel Gas
Code), ANSI (American National Standards Institute) Z223.1latest year and addendum Z223.1A-latest year. In Canada,
installation must be in accordance with the CAN1.B149.1 and
CAN1.B149.2 installation codes for gas burning appliances.
Flue vent discharge must have a minimum horizontal clearance of 4 ft from electric and gas meters, gas regulators, and
gas relief equipment.
After unit is in position, remove shipping materials and rigging skids.
V. STEP 5 — INSTALL FLUE HOOD
Flue hood is shipped screwed to the burner compartment
access panel. Remove from shipping location and, using
screws provide d , in st all f lue h oo d i n lo cat ion s hown i n Fi g. 7
and 8.
For units being installed in California Air Quality Management Districts which require NOx emi ssions of 40 nanogr ams/
joule or less, a low NOx unit must be installed .
NOTE: Low NOx units are available for 3 to 5 ton units.
VI. STEP 6 — INSTALL GAS PIPING
Unit is equipped for use wi th type of gas shown on nameplate. Refer to local building codes, or in the absence of local
codes, to ANSI Z223.1-latest year and addendum Z223.1Alatest year entitled NFGC. In Canada, installation must be
in accordance with the CAN1.B149.1 and CAN1.B149.2
installation codes for gas burning appliances.
For natural gas applications, gas pressure at unit gas connection must not be less than 4.0 in. wg or greater than
13.0 in. wg while unit is operating. For liquid propane and
high heat applications, the gas pressure must not be less
than 5.0 in. wg or greater than 13.0 in. wg at the unit
connection.
—4—
NOTES:
1. Place unit on curb as close as possible to the duct end.
2. Dimension in ( ) is in millimeters.
3. Hook rigging shackles through holes in base rail as shown in detail
“A.” Holes in base rails are centered around the unit center of gravity. Use wooden top skid when rigging to prevent rigging straps
from damaging unit.
4. Weights include base unit without economizer. See Table 1 for unit
operating weights and economizer weights.
5. Weights include base unit without the Perfect Humidity™ dehumidification system. See Table 1 for additional unit operating weights
with the Perfect Humidity system.
CAUTION: All panels must be in place when rigging.
Fig. 6 — Rigging Details
OPERATING
UNIT
581B
036 530 240 73.69 1872 35.50 902 33.31 847
048 540 245 73.69 1872 35.50 902 33.31 847
060 560 254 73.69 1872 35.50 902 33.31 847
072 635 288 73.69 1872 35.50 902 33.31 847
WEIGHT
lb kg in. mm in. mm in. mm
“A” “B” “C”
Size gas supply piping for 0.5-in. wg maximum pressure
drop. Do not use supply pipe smaller than unit gas
connection.
Support gas piping as shown in the table in Fig. 9. For exam-
3
ple, a
/4-in. gas pipe must have one field-fabricated support
beam every 8 ft. Ther ef or e, an 18-ft long gas pipe would h a v e
a minimum of 3 support beams. See Fig. 9 for typical pipe
guide and locations of external manual gas shutoff valve.
NOTE: If accessory thru-the-bottom connections and roof
curb are used, refer to the Thru-the-Bottom Accessory
Installation Instructions for information on power wiring
and gas connection piping. Power wiring, control wiring and
gas connection piping can be routed through field-drilled
holes in the basepan, which is specifically designed and dimpled for drilling the accessory connection holes.
CAUTION: When connecting the gas line to the
unit gas valve, the installer MUST use a backup
wrench to prevent damage to the valve.
—5—
Table 1 — Physical Data — 581B036-072
UNIT SIZE 581B 036 048 060 072
NOMINAL CAPACITY 3456
OPERATING WEIGHT (lb)
Unit 530 540 560 635
EconoMi$er IV 50 50 50 50
Perfect Humidity™ Dehumidification System 15 23 23 29
Roof Curb 115 115 115 115
COMPRESSOR Scroll
Quantity 1111
Oil (oz) 42 53 50 60
REFRIGERANT TYPE R-22
Operating Charge (lb-oz)
Standard Unit 5-8 10-2 10-0 12-8
Unit With Perfect Humidity Dehumidification System 9-0 15-8 17-0 21-0
CONDENSER FAN Propeller
Quantity...Diameter (in.) 1...22 1...22 1...22 1...22
Nominal Cfm 3500 3500 4100 4100
Motor Hp...Rpm
Watts Input (Total) 180 180 320 320
CONDENSER COIL Enhanced Copper Tubes, Aluminum Lanced Fins
Rows...Fins/in. 1...17 2...17 2...17 2...17
Total Face Area (sq ft) 14.6 16.5 16.5 16.5
EVAPORATOR COIL Enhanced Copper Tubes, Aluminum Double-Wavy Fins, Acutrol™ Metering Device
Standard Unit
Rows...Fins/in. 2...15 2...15 4...15 4...15
Total Face Area (sq ft) 5.5 5.5 5.5 5.5
Unit with Perfect Humidity Dehumidification System
Rows...Fins/in. 1...17 2...17 2...17 2...17
Total Face Area (sq ft) 3.9 3.9 3.9 5.2
EVAPORATOR FAN Centrifugal Type, Belt Drive
Quantity...Size (in.) 1...10 x 10 1...10 x 10 1...10 x 10 1...10 x 10
Nominal Cfm 1200 1600 2000 2400
Maximum Continuous Bhp Std 1.20 1.20 1.30/2.40* 2.40
Motor Frame Size Std 48 48 48/56* 56
Fan Rpm Range Std 680-1044 770-1185 1035-1460 1119-1585
Motor Bearing Type Ball Ball Ball Ball
Maximum Fan Rpm 2100 2100 2100 2100
Motor Pulley Pitch Diameter A/B (in.) Std 1.9/2.9 1.9/2.0 2.4/3.4 2.4/3.4
Nominal Motor Shaft Diameter (in.) Std
Fan Pulley Pitch Diameter (in.) Std 4.5 4.0 4.0 4.0
Belt — Type...Length (in.) Std 1...A...36 1...A...36 1....4...40 1...A...38
Pulley Center Line Distance (in.) 10.0-12.4 10.0-12.4 14.7-15.5 14.7-15.5
Speed Change per Full Turn of
Movable Pulley Flange (rpm)
Movable Pulley Maximum Full
Turns from Closed Position
Factory Setting — Full Turns Open Std 3333
Factory Speed Setting (rpm) Std 826 936 1248 1305
Fan Shaft Diameter at Pulley (in.)
Hi-Static 2.40 2.40 2.90 2.90
Hi-Static 56 56 56 56
Hi-Static 1075-1455 1075-1455 1300-1685 1300-1685
Hi-Static 2.8/3.8 2.8/3.8 3.4/4.4 3.4/3.4
Hi-Static
Hi-Static 4.5 4.0 4.5 4.5
Hi-Static 1...A...39 1...A...39 1...A...40 1...A...40
Std 65 70 75 95
Hi-Static 65 65 60 60
Std 5565
Hi-Static 6655
Hi-Static 3
Hi-Static 1233 1233 1396 1396
LEGEND
Bhp — Brake Horsepower
*Single phase/three phase.
†Indicates automatic reset.
**60,000 and 72,000 Btuh heat input units have 2 burners. 90,000 and
120,000 Btuh heat input units have 3 burners. 115,000 Btuh heat input units
and 150,000 Btuh Heat input units have 3 burners.
1
/4...825
1
/
5
/
1
5
/
1
/4...825
1
31/
units.
x
/
2
5
/
8
2
5
/
8
2
8
/
2
8
††An LP kit is available as an accessory. If an LP kit is used with low NO
one low NOx baffle must be removed and the units will no longer be classified
as low NO
||California compliant three-phase models.
***California SCAQMD compliant low NO
are controlled to 40 nanograms per joule or less.
1
/4...1100
5
/
8
5
/
8
31/
2
5
/
8
models have combustion products that
x
1
/4...1100
5
/
8
7
/
8
31/
5
/
8
2
units,
x
—6—
Table 1 — Physical Data — 581B036-072 (cont)
UNIT SIZE 581B 036 048 060 072
FURNACE SECTION
Rollout Switch Cutout Temp (F)† 195 195 195 195
Burner Orifice Diameter (in. ...drill size)**
Natural Gas — Std 071/072 .113...33 .113...33 .113...33 .113...33
Liquid Propane — Alt††
Thermostat Heat Anticipator Setting (amps)
208/230/460 v
First Stage .14 .14 .14 .14
Second Stage .14 .14 .14 .14
Gas Input (Btuh)
First Stage/Second Stage (3-phase units) 072 50,000/ 72,000 50,000/ 72,000 50,000/ 72,000 50,000/ 72,000
Efficiency (Steady State) (%)
Temperature Rise Range
Manifold Pressure (in. wg)
Natural Gas — Std 3.5 3.5 3.5 3.5
Liquid Propane — Alt†† 3.5 3.5 3.5 3.5
Maximum Static Pressure (in. wg) 1.0 1.0 1.0 1.0
Field Gas Connection Size (in.)
HIGH-PRESSURE SWITCH (psig)
Standard Compressor Internal Relief
Cutout
Reset (Auto.)
LOSS-OF-CHARGE SWITCH/LOW-PRESSURE
SWITCH (Liquid LIne) (psig)
Cutout
Reset (Auto.)
FREEZE PROTECTION THERMOSTAT
Opens (F)
Closes (F)
OUTDOOR-AIR INLET SCREENS
Quantity...Size (in.)
RETURN-AIR FILTERS Throwaway
Quantity...Size (in.) 2...16 x 25 x 2
LEGEND
Brake Horsepower
Bhp —
*Single phase/three phase.
†Indicates automatic reset.
**60,000 and 72,000 Btuh heat input units have 2 burners. 90,000 and
120,000 Btuh heat input units have 3 burners. 115,000 Btuh heat input units
and 150,000 Btuh Heat input units have 3 burners.
114/115 .113...33 .113...33 .113...33 .113...33
149/150 — .129...30 .129...30 .129...30
060N .102...38 .102...38 .102...38 —
090N .102...38 .102...38 .102...38 —
120N — .116...32 .116...32 —
071/072 .089...43 .089...43 .089...43 .089...43
114/115 .089...43 .089...43 .089...43 .089...43
149/150 — .102...38 .102...38 .102...38
060N .082...45 .082...45 .082...45 —
090N .082...45 .082...45 .082...45 —
120N — .094...42 .094...42 —
115 82,000/115,000 82,000/115,000 82,000/115,000 82,000/115,000
150 — 120,000/150,000 120,000/150,000 120,000/150,000
071II —/ 72,000 —/ 72,000 —/ 72,000 —
114II —/115,000 —/115,000 —/115,000 —
149II — —/150,000 —/150,000 —
060N*** —/ 60,000 —/ 60,000 —/ 60,000 —
090N*** —/ 90,000 —/ 90,000 —/ 90,000 —
120N*** — —/120,000 —/120,000 —
072 82.8 82.8 82.8 82
115 80 81 81 81
150 — 80.4 80.4 80
071 82 82 82 —
114 80 81 81 —
149 —8080—
060N 80.2 80.2 80.2 —
090N 81 81 81 —
120N — 80.7 80.7 —
072 25-55 25-55 25-55 25-55
115 55-85 35-65 35-65 35-65
150 — 50-80 50-80 50-80
071 25-55 25-55 25-55 —
114 55-85 35-65 35-65 —
149 — 50-80 50-80 —
060N 20-50 20-50 20-50 —
090N 30-60 30-60 30-60 —
120N — 40-70 40-70 —
1
/
2
1
/
2
450 ± 50
428
320
7 ± 3
22 ± 5
30 ± 5
45 ± 5
Cleanable
1...20 x 24 x 1
1
/
2
4...16 x 16 x 2
††An LP kit is available as an accessory. If an LP kit is used with low NO
one low NO
as low NO
||California compliant three-phase models.
***California SCAQMD compliant low NOx models have combustion products that
are controlled to 40 nanograms per joule or less.
baffle must be removed and the units will no longer be classified
x
units.
x
1
/
2
units,
x
—7—
—8—
Fig. 7 — Base Unit Dimensions — 581B036-072
Fig. 8 — Flue Hood Details
LEGEND
NFGC — National Fuel Gas Code
*Field supplied.
NOTE: Follow all local codes.
STEEL PIPE
NOMINAL DIAMETER
1
/
1
(in.)
1
/
2
3
/
or 1
4
or larger
4
SPACING OF SUPPORTS
X DIMENSION
(ft)
6
8
10
Fig. 9 — Gas Piping Guide (With Accessory
Thru-the-Curb Service Connections)
VII. STEP 7 — MAKE ELECTRICAL CONNECTIONS
WARNING: Unit cabinet must have an uninter-
rupted, unbroken electrical ground to minimize the
possibility of personal injury if an electrical fault
should occur. This ground may consist of electrical wire
connected to unit ground lug in control compartment,
or conduit approved for electrical ground when
installed in accordance with NEC (National Electrical
Code), ANSI/NFPA (National Fire Protection Association), latest edition, and local electrical codes. Do not
use gas piping as an electrical ground. Failure to follow
this warning could result in the installer being liable
for personal injury of other s.
A. Field Power Supply
All units except 208/230-v units are factory wired for the
voltage shown on the nam eplate. If the 208/230-v unit is to
be connected to a 208-v power supply, the transformer must
be rewired by moving the blac k wire fro m the 230 -v terminal
on the transforme r and connecting it to the 200-v terminal
on the transformer.
Refer to unit label diagram for additional information. Pigtails are provided for field service. Use factory-supplied
splices or UL (Underwriters’ Laborato ries) approved copper
connector.
When installing units, provide a disconnect per NEC.
All field wiring must comply with NEC and local require-
ments. In Canada, electrical connections must be in accordance with CSA (Canadian Standards Association) C22.1
Canadian Electrical Code Part One.
Install conduit through side panel openings indicated in
Fig. 7. Route power lines through connector to terminal
connections as shown in Fig. 10.
On 3-phase units, voltages between phase s must be balanced
within 2% and the current within 10%. Use the formula
shown in Note 3 under Tables 2A-2D to determine the percentage of voltage imbalance. Operation on improper line
voltage or excessive phase imbalance constitutes abuse and
may cause damage to electrical components. Such operation
would invalidate any applicable Bryant warranty.
NOTE: If thru-the-bottom accessory connections are used,
refer to the thru-the-bottom accessory installation instructions for power wiring. Refer to Fig. 7 for location to drill
holes in basepan.
B. Field Control Wiring
Install a Bryant-approved accessory thermostat assembly
according to installation instructions included with the
accessory. Locate thermostat assembly on a solid wall in the
conditioned space to sense average temperature in accordance with thermostat installation instructions.
Route thermostat cable or equivalent single leads of colored
wire from thermostat subbase terminals to low-voltage connections on unit (shown in Fig. 11) as described in Steps 1-4
below.
1. If mounted on a ro of cu rb an d el ec tr ic al powe r is to b e
run through the basepan, an accessory thru-the-bottom connection kit is required. This is available
through the local Bryant distributor. This kit is
required to ensure a relia ble water-tight connection.
2. If unit is mounte d on roof curb and accessory thruthe-bottom connections are used, route wire through
connection plate.
3. Pass control wires thro ugh th e hole pro vided o n unit
(see connection D, Connection Sizes table, Fig. 7).
4. Feed wires through the raceway built into the corner
post to the 24-v barrier located on the left side of the
control box. See Fig. 12. The raceway provides the
UL-required clearance between high- and low-voltage
wiring.
5. Connect thermostat wires to s crew terminals of lowvoltage connection board (see Fig. 11).
NOTE: For wire runs up to 50 ft, use no. 18 AWG (American
Wire Gage) insulated wire (35 C minimum). For 51 to 75 ft,
use no. 16 AWG insulated wire (35 C minimum). For over
75 ft, use no. 14 AWG insulated wire (35 C minimum).
NOTE: All wire larger than no. 18 AWG cannot be directly
connected to the thermostat and will require a junction box
and splice at the thermostat.
C. Heat Anticipator Settings
Set heat anticipator settings at 0.14 amp for first stage and
0.14 amp for second-stage heating, when available.
—9—
Fig. 10 — Power Wiring Connections
BRYANT ELECTRONIC THERMOSTAT
LEGEND
LEGEND
C—Contactor
C—Contactor
COMP — Compressors
COMPS — Compressors
EQUIP — Equipment
EQUIP — Equipment
GND — Ground
GND — Ground
IFC — Indoor (Evaporator)
IFC — Indoor (Evaporator)
NEC — National Electrical Code
NEC — National Electrical Code
TB — Terminal Block
TB — Terminal Block
Fan Contactor
Fan Contactor
COOL STAGE 1
FAN
HEAT STAGE 1
COOL STAGE 2
HEAT STAGE 2
24 VAC HOT
24 VAC COM
N/A
OUTDOOR AIR
SENSOR
THERMOSTAT DIPSWITCH SETTINGS
ON
OFF
B
A
C
Y1/W2
G
W/W1
Y/Y2
O/W2
R
C
S1
S2
D
R
G
Y1
Y2
W1
W2
C
IPD/X
WIRE
CONNECTIONS
TO
LOW-VOLTAGE
SECTION
LEGEND
Field Wiring
NOTE: Underlined letter indicates active thermostat output when configured for A/C operation.
Fig. 11 — Low-Voltage Connections With or
Without Economizer
RACEWAY LOW VOLTAGE
HOLE IN END PANEL (HIDDEN)
CONNECTIONS
INTEGRATED GAS UNIT
CONTROLLER (IGC)
Fig. 12 — Field Control Wiring Raceway
—10—
Table 2A — Electrical Data — Standard Motor Units Without Electrical Convenience Outlet
UNIT
581B
036
(3 Tons)
048
(4 Tons)
060
(5 Tons)
072
(6 Tons)
NOMINAL VOLTAGE
(V-Ph-Hz)
208/230-1-60 187 254
208/230-3-60 187 254 10.3 77.0 0.7 4.9 .60 18.5/18.5 25/25 18/18 90/90
460-3-60 414 508 5.1 39.0 0.4 2.2 .30 9.0 20 9 46
575-3-60 518 632 4.2 31.0 0.4 2.2 .30 7.3 20 7 37
208/230-1-60 187 254
208/230-3-60 187 254 13.5 93.0 0.7 4.9 .60 22.5/22.5 30/30 22/22 106/106
460-3-60 414 508 6.4 46.5 0.4 2.2 .30 10.6 20 10 54
575-3-60 518 632 6.4 40.0 0.4 2.2 .30 10.1 20 10 46
208/230-1-60 187 254
208/230-3-60 187 254 17.3 123.0 1.5 5.8 .60 28.9/28.9 35/35 28/28 168/168
460-3-60 414 508 9.0 62.0 0.8 2.6 .30 14.7 20 14 84
575-3-60 518 632 7.1 50.0 0.8 2.6 .30 11.6 20 12 68
208/230-3-60 187 254
460-3-60 414 508 9.6 75.0 0.6 2.6 .30 15.2 20 15 97
575-3-60 518 632 7.7 56.0 0.6 2.6 .30 12.2 20 12 74
VOLTAGE
RANGE
Min Max Qty RLA LRA FLA FLA FLA MCA MOCP** FLA LRA
COMPRESSOR
(each)
16.0 88.0 0.7 4.9 .60 25.6/25.6 30/30 25/25 101/101
1
23.7 126.0 0.7 4.9 .60 35.2/35.2 45/45 34/34 139/139
1
28.8 169.0 1.5 8.8 .60 46.3/46.3 60/60 45/45 216/216
1
20.5 156.0 1.4 5.8 .60 32.8/32.8 40/40 32/32 200/200
1
Table 2B — Electrical Data — Standard Motor Units With Electrical Convenience Outlet
UNIT
581B
036
(3 Tons)
048
(4 Tons)
060
(5 Tons)
072
(6 Tons)
FLA — Full Load Amps
HACR — Heating, Air Conditioning and
IFM — Indoor (Evaporator) Fan Motor
LRA — Locked Rotor Amps
MCA — Minimum Circuit Amps
MOCP — Maximum Overcurrent Protection
NEC — National Electrical Code
OFM — Outdoor (Condenser) Fan Motor
RLA — Rated Load Amps
UL — Underwriters’ Laboratories
*The values listed in this table do not include power exhaust. See table at right for
power exhaust requirements.
†Used to determine minimum disconnect per NEC.
**Fuse or HACR circuit breaker.
NOTES:
1. In compliance with NEC requirements for multimotor and combination load
equipment (refer to NEC Articles 430 and 440), the overcurrent protective
device for the unit shall be fuse or HACR breaker. The UL, Canada units
may be fuse or circuit breaker.
2. Electrical data based on 95 F ambient outdoor-air temperature ± 10% voltage.
3. Unbalanced 3-Phase Supply Voltage
Never operate a motor where phase imbalance in supply voltage is greater
than 2%. Use the following formula to determine the percent voltage
imbalance.
% Voltage Imbalance
= 100 x
Example: Supply voltage is 460-3-60.
Determine maximum deviation from average voltage.
NOMINAL VOLTAGE
(V-Ph-Hz)
208/230-1-60 187 254
208/230-3-60 187 254 10.3 77.0 0.7 4.9 .60 24.5/24.5 30/30 24/24 95/95
460-3-60 414 508 5.1 39.0 0.4 2.2 .30 11.7 20 11 48
575-3-60 518 632 4.2 31.0 0.4 2.2 .30 9.5 20 9 38
208/230-1-60 187 254
208/230-3-60 187 254 13.5 93.0 0.7 4.9 .60 28.5/28.5 35/35 27/27 111/111
460-3-60 414 508 6.4 46.5 0.4 2.2 .30 13.3 20 13 56
575-3-60 518 632 6.4 40.0 0.4 2.2 .30 12.2 20 12 47
208/230-1-60 187 254
208/230-3-60 187 254 17.3 123.0 1.5 5.8 .60 34.9/34.9 40/40 34/34 173/173
460-3-60 414 508 9.0 62.0 0.8 2.6 .30 17.4 20 17 87
575-3-60 518 632 7.1 50.0 0.8 2.6 .30 13.8 20 13 70
208/230-3-60 187 254
460-3-60 414 508 9.6 75.0 0.6 2.6 .30 17.9 20 17 99
575-3-60 518 632 7.7 56.0 0.6 2.6 .30 14.3 20 14 75
LEGEND
Refrigeration
max voltage deviation from average voltage
AB = 452 v
BC = 464 v
AC = 455 v
Average Voltage =
VOLTAGE
RANGE
Min Max Qty RLA LRA FLA FLA FLA MCA MOCP** FLA LRA
average voltage
452 + 464 + 455
1371
=
3
= 457
1
1
1
1
3
COMPRESSOR
(each)
16.0 88.0 0.7 4.9 .60 31.6/31.6 35/35 30/30 106/106
23.7 126.0 0.7 4.9 .60 41.2/41.2 50/50 39/39 144/144
28.8 169.0 1.5 8.8 .60 52.3/52.3 60/60 50/50 221/221
20.5 156.0 1.4 5.8 .60 38.8/38.8 45/45 37/37 205/205
OFM
(each)
OFM
(each)
COMBUSTION
IFM
FAN MOTOR
COMBUSTION
IFM
FAN MOTOR
(AB) 457 – 452 = 5 v
(BC) 464 – 457 = 7 v
(AC) 457 – 455 = 2 v
Maximum deviation is 7 v.
Determine percent of voltage imbalance.
% Voltage Imbalance = 100 x
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.
= 1.53%
POWER
SUPPLY*
POWER
SUPPLY
WITH OUTLET*
7
457
MINIMUM UNIT
DISCONNECT SIZE†
MINIMUM UNIT
DISCONNECT SIZE†
POWER EXHAUST ELECTRICAL DATA
POWER EXHAUST
PART NO.
CRPWREXH021A01 N/A 0.9 N/A 15
CRPWREXH022A01 3.3 N/A 1.32 15
CRPWREXH023A01 N/A 1.8 N/A 15
CRPWREXH028A01 1.7 N/A 0.68 15
CRPWREXH029A01 N/A 1.0 N/A 15
CRPWREXH030A01 1.6 N/A 0.64 15
N/A — Not available
NOTE: If a single power source is to be used, size wire to include power exhaust
MCA and MOCP.
Check MCA and MOCP when power exhaust is powered through the unit. Determine the new MCA including the power exhaust using the following formula:
MCA New = MCA unit only + MCA of Power Exhaust
For example, using a 581B072 unit with MCA = 32.8 and MOCP = 40, with
CRPWREXH030A01 power exhaust.
MCA New = 32.8 amps + 1.6 amps = 34.4 amps
If the new MCA does not exceed the published MOCP, then MOCP would not
change. The MOCP in this example is 40 amps and the MCA New is below 40;
therefore the MOCP is acceptable. If “MCA New” is larger than the published
MOCP, raise the MOCP to the next larger size. For separate power, the MOCP for
the power exhaust will be 15 amps per NEC.
MCA
(230 v)
MCA
(460 v)
MCA
(575 v)
MOCP
(for separate
power source)
—11—
Table 2C — Electrical Data — High-Static Motor Units Without Electrical Convenience Outlet
UNIT
581B
036
048
060
072
NOMINAL
VO LTAG E
(V-Ph-Hz)
208/230-3-60 187 254
460-3-60 414 508 5.1 39.0 0.4 2.6 0.3 9.4 20 9 60
575-3-60 518 632 4.2 31.0 0.4 2.6 0.3 7.7 20 8 48
208/230-3-60 187 254
460-3-60 414 508 6.4 46.5 0.4 2.6 0.3 11.0 20 11 68
575-3-60 518 632 6.4 40.0 0.4 2.6 0.3 10.4 20 10 57
208/230-3-60 187 254
460-3-60 414 508 9.0 62.0 0.8 3.4 0.3 15.5 20 15 94
575-3-60 518 632 7.1 50.0 0.8 3.4 0.3 12.2 20 12 76
208/230-3-60 187 254
460-3-60 414 508 9.6 75.0 0.6 3.4 0.3 16 20 16 107
575-3-60 518 632 7.7 56.0 0.6 3.4 0.3 12.8 20 13 81
VOLTAGE
RANGE
Min Max Qty RLA LRA FLA FLA RLA MCA MOCP** FLA LRA
COMPRESSOR
(each)
10.3 77.0 0.7 5.8 0.6 19.4 25 19 120
1
13.5 93.0 0.7 5.8 0.6 23.4 30 23 136
1
17.3 123.0 1.5 7.5 0.6 30.6 35 30 187
1
20.5 156.0 1.4 7.5 0.6 34.5 40 34 219
1
Table 2D — Electrical Data — High-Static Motor Units With Electrical Convenience Outlet
UNIT
581B
036
048
060
072
FLA — Full Load Amps
HACR — Heating, Air Conditioning and
IFM — Indoor (Evaporator) Fan Motor
LRA — Locked Rotor Amps
MCA — Minimum Circuit Amps
MOCP — Maximum Overcurrent Protection
NEC — National Electrical Code
OFM — Outdoor (Condenser) Fan Motor
RLA — Rated Load Amps
UL — Underwriters’ Laboratories
*The values listed in this table do not include power exhaust. See table at right for
power exhaust requirements.
†Used to determine minimum disconnect per NEC.
**Fuse or HACR circuit breaker.
NOTES:
1. In compliance with NEC requirements for multimotor and combination load
2. Electrical data based on 95 F ambient outdoor-air temperature ± 10% voltage.
3. Unbalanced 3-Phase Supply Voltage
NOMINAL
VOLTAGE
(V-Ph-Hz)
208/230-3-60 187 254
460-3-60 414 508 5.1 39.0 0.4 2.6 0.3 12.1 20 12 63
575-3-60 518 632 4.2 31.0 0.4 2.6 0.3 9.8 20 10 50
208/230-3-60 187 254
460-3-60 414 508 6.4 46.5 0.4 2.6 0.3 13.7 20 13 70
575-3-60 518 632 6.4 40.0 0.4 2.6 0.3 12.6 20 12 59
208/230-3-60 187 254
460-3-60 414 508 9.0 62.0 0.8 3.4 0.3 18.2 20 18 96
575-3-60 518 632 7.1 50.0 0.8 3.4 0.3 14.4 20 14 77
208/230-3-60 187 254
460-3-60 414 508 9.6 75.0 0.6 3.4 0.3 18.7 25 18 109
575-3-60 518 632 7.7 56.0 0.6 3.4 0.3 15.0 20 15 83
LEGEND
Refrigeration
equipment (refer to NEC Articles 430 and 440), the overcurrent protective
device for the unit shall be fuse or HACR breaker. The UL, Canada units
may be fuse or circuit breaker.
Never operate a motor where phase imbalance in supply voltage is greater
than 2%. Use the following formula to determine the percent voltage
imbalance.
% Voltage Imbalance
= 100 x
Example: Supply voltage is 460-3-60.
Determine maximum deviation from average voltage.
max voltage deviation from average voltage
VOLTAGE
RANGE
Min Max Qty RLA LRA FLA FLA RLA MCA MOCP** FLA LRA
average voltage
AB = 452 v
BC = 464 v
AC = 455 v
Average Voltage =
1371
=
= 457
COMPRESSOR
10.3 77.0 0.7 5.8 0.6 25.4 30 25 124
1
13.5 93.0 0.7 5.8 0.6 29.4 35 29 140
1
17.3 123.0 1.5 7.5 0.6 36.6 40 36 192
1
20.5 156.0 1.4 7.5 0.6 40.5 45 39 224
1
452 + 464 + 455
3
3
(each)
OFM
(each)
OFM
(each)
IFM
IFM
COMBUSTION
FAN MOTOR
COMBUSTION
FAN MOTOR
(AB) 457 – 452 = 5 v
(BC) 464 – 457 = 7 v
(AC) 457 – 455 = 2 v
Maximum deviation is 7 v.
Determine percent of voltage imbalance.
% Voltage Imbalance = 100 x
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.
= 1.53%
7
457
POWER
SUPPLY*
POWER
SUPPLY*
MINIMUM UNIT
DISCONNECT
MINIMUM UNIT
DISCONNECT
POWER EXHAUST ELECTRICAL DATA
POWER EXHAUST
PART NO.
CRPWREXH021A01 N/A 0.9 N/A 15
CRPWREXH022A01 3.3 N/A 1.32 15
CRPWREXH023A01 N/A 1.8 N/A 15
CRPWREXH028A01 1.7 N/A 0.68 15
CRPWREXH029A01 N/A 1.0 N/A 15
CRPWREXH030A01 1.6 N/A 0.64 15
N/A — Not available
NOTE: If a single power source is to be used, size wire to include power exhaust
MCA and MOCP.
Check MCA and MOCP when power exhaust is powered through the unit. Determine the new MCA including the power exhaust using the following formula:
MCA New = MCA unit only + MCA of Power Exhaust
For example, using a 581B072 unit with MCA = 32.8 and MOCP = 40, with
CRPWREXH030A01 power exhaust.
MCA New = 32.8 amps + 1.6 amps = 34.4 amps
If the new MCA does not exceed the published MOCP, then MOCP would not
change. The MOCP in this example is 40 amps and the MCA New is below 40;
therefore the MOCP is acceptable. If “MCA New” is larger than the published
MOCP, raise the MOCP to the next larger size. For separate power, the MOCP for
the power exhaust will be 15 amps per NEC.
MCA
(230 v)
MCA
(460 v)
MCA
(575 v)
SIZE†
SIZE†
MOCP
(for separate
power source)
—12—
VIII. STEP 8 — ADJUST FACTORY-INSTALLED OPTIONS
A. Disconnect Switch
The optional disconnect switch is non-fused. The switch has
the capability of bei ng locked in place for safety purposes.
B. Perfect Humidity™ Dehumidification System
Perfect Humidity system operation can be controlled by field
installation of a Bryant-approved humidistat device (Fig. 13),
or light commercial Thermidistat™ device (Fig. 14). To install
the humidistat device:
1. Route humidistat cable through hole provided in unit
corner post.
2. Feed wires through the raceway built into th e corner
post to the 24-v barrier located on the l eft side of the
control box. See Fig. 12. The raceway provides the
UL-required clearance betw ee n high -volta ge and l owvoltage wiring.
3. Use a wire nut to connect humidistat cable into lo wvoltage wiring as shown in Fig. 15.
To install Thermidistat device:
1. Route Thermidistat cable through hole provided in
unit corner post.
2. Feed the wires through the raceway built into the corner post to the 24-v barrier located on the left side of
the control box. See Fig. 12. The raceway provides the
UL-required clearance between high and low voltage
wiring.
3. A field-supplied relay must be installed between the
Thermidistat device and the Perfect Humidity circuit
(recommended relay: HN612KK324). See Fig. 16. The
relay coil is connected between the DEHUM output
and C (common) of the unit. The relay controls the
Perfect Humidity solenoid valve and must be wired
between the Perfect Humidity fuse and the low-pressure switch. Refer to the installation instructions
included with the Bryant Light Commercial Thermidistat device for more information.
% RELATIVE HUMIDITY
Fig. 13 — Accessory Field-Installed Humidistat Device
Fig. 14 — Light Commercial Thermidistat Device
C—Contactor (Compressor)
CB — Circuit Breaker
CR — Cooling Relay
DHR — Dehumidify Relay
DSV — Discharge Solenoid Valve
HU — Humidistat
LPS —
LSV — Liquid Line Solenoid Valve
Low Pressure Switch
LEGEND
LTLO —
TRAN — Transformer
Low Temperature Lockout
Terminal (Unmarked)
Splice
Factory Wiring
Accessory or Optional Wiring
Fig. 15 — Typical Perfect Humidity Dehumidification System
Humidistat Wiring (208/230-v Unit Shown)
—13—
LCT
R
C
Y1
Y2
G
W1
W2
DEHUM
OC
CB — Circuit Breaker
LCT — Light Commercial Thermidistat™ Device
LLSV — Liquid Line Solenoid Valve
LTLO — Low Temperature Lockout
T STAT WIRES
LEGEND
R1
R1
Fig. 16 — Typical Rooftop Unit with Perfect Humidity™ Dehumidification System with Thermidistat Device
C. Convenience Outlet
An optional convenience outlet provides power for rooftop
use. For maintenance personnel safety, the convenience outlet power is off when the unit disconnect is off. Adjacent unit
outlets may be used f or service tools. An optional “Ho t Outlet” is available from the factory as a special order item.
D. Manual Outdoor-Air Damper
The outdoor-air hood and screen are attached to the basepan
at the bottom of the unit for shipping.
Assembly:
1. Determine quantity of ventilation required for building. Record amount for use in Step 8.
2. Remove outdoor-air opening panel. Save panels and
screws. See Fig. 17.
3. Remove evaporator coil access panel. Separate hood
and screen from basepan by removing the 4 scre ws
securing them. Save all screws.
4. Replace evaporator coil access panel.
5. Place hood on front of outdoor-air opening panel. See
Fig. 18 for hood details. Secure top of hood with the 4
screws removed in Step 3. See Fig. 19.
6. Remove and save 6 screws (3 on each side) from sides
of the manual outdo or-air damper.
7. Align screw holes on hood with screw holes on side of
manual outdoor-air damper. See Fig. 18 and 19.
Secure hood with 6 screws from Step 6.
8. Adjust minimum position setting of the damper blade
by adjusting the manual outdoor-air adjustment
screws on the fron t of the damper bl ade. See Fig. 17.
Slide blade vertically until it is in the appropriate
position determined by Fig. 20. Tighten screws.
9. Remove and save screws currently on sides of hood.
Insert screens. Secure screens to hood using the
screws. See Fig. 19.
ROOF TOP UNIT
OUTDOOR
AIR OPENING
PANEL
3 SCREWS
(SIDE)
Fig. 17 — Damper Panel with Manual
R
C
Y1
Y2
G
W1
W2
PINK
PINK
PERFECT HUMIDITY SYSTEM
CB
3.2 AMPS
LTLO
RED
PINK
Outdoor-Air Damper Installed
24 V
FROM
PERFECT HUMIDITY
SYSTEM LLSV
—14—
Fig. 18 — Outdoor-Air Hood Details
WIRING
HARNESS
ACTUATOR
ECONOMI$ER IV
CONTROLLER
OUTSIDE AIR
TEMPERATURE SENSOR
LOW AMBIENT
SENSOR
Fig. 19 — Optional Manual Outdoor-Air Damper
with Hood Attached
Fig. 20 — Outdoor-Air Damper Position Setting
E. Optional EconoMi$er IV
See Fig. 21 for EconoMi$er IV component locations.
NOTE: These instructions are for installing the optional
EconoMi$er IV only. Refer to the accessory EconoMi$er IV
installation instructions when field installing an EconoMi$er
IV accessory.
1. To remove the existing unit filter access panel, raise
the panel and swing the bottom outward. The panel is
now disengaged from the track and can be removed.
See Fig. 22.
2. The box with the economizer hood components is
shipped in the compartment behind the economizer.
The EconoMi$er IV controller is mounted on top of
the EconoMi$er I V in the position shown in Fig. 21.
To remove the component box from its shipping position, remove the scr ew holding the ho od box bracket
to the top of the economizer. Slide the hood box out of
the unit. See Fig. 23.
Fig. 21 — EconoMi$er IV Component Locations
FILTER ACCESS PANEL
COMPRESSOR
ACCESS PANEL
OUTDOOR-AIR OPENING AND
INDOOR COIL ACCESS PANEL
Fig. 22 — Typical Access Panel Locations
x
o
B
d
o
o
H
HOOD BOX
BRACKET
Fig. 23 — Hood Box Removal
—15—
IMPORTANT: If the power exhaust accessory is to be
installed on the unit, the hood shipped with the unit will not
be used and must be discarded. Save the aluminum filter
for use in the power exhaust hood assembly.
3. The indoor coil access panel will be used as the top of
the hood. Remove the screws along the sides an d bottom of the indoor coil access panel. See Fig. 24.
4. Swing out indoor coil access panel and insert the
hood sides under the panel (hood top). Use the screws
provided to attach the hood sides to the hood top. Use
screws provided to attach the hoo d sides to the unit.
See Fig. 25.
5. Remove the shipping tape holding the economizer
barometric relief damper in place.
6. Insert the ho od divider between the hood side s. See
Fig. 25 and 26. Secure hood divider with 2 screws on
each hood side. The hood di vider is also used as the
bottom filter rack for the aluminum filter.
BAROMETRIC
RELIEF
17 1/4”
DIVIDER
OUTSIDE
AIR
CLEANABLE
ALUMINUM
FILTER
FILTER
Fig. 26 — Filter Installation
HOOD
FILTER
CLIP
SIDE
PAN EL
CAULK
INDOOR
COIL
ACCESS
PANEL
HERE
Fig. 24 — Indoor Coil Access Panel Relocation
TOP
PANEL
INDOOR COIL
ACCESS PANEL
LEFT
HOOD
SIDE
B
19 1/16”
HOOD DIVIDER
SCREW
33 3/8”
Fig. 25 — Outdoor-Air Hood Construction
TOP
SIDE
PANEL
INDOOR
COIL
ACCESS
PAN EL
7. Open the filter clips which are located underneath
the hood top. Insert the aluminum filter into the bottom filter rack (hood divider). Push the filter into
position past the ope n fil ter cli ps . Clos e th e filt er c lip s
to lock the filter into place. See Fig. 26.
8. Caulk the ends of the joint between the unit top panel
and the hood top. See Fig. 24.
9. Replace the filter access panel.
10. Install all EconoMi$er IV accessories. EconoMi$er IV
wiring is shown in Fig. 27.
Barometric flow capacity is shown in Fig. 28. Outdoor air
leakage is shown in Fig. 29. Return air pressure drop is
shown in Fig. 30.
F. EconoMi$er IV Standard Sensors
Outdoor Air Temperature (OAT) Sensor
The outdoor air temperature sensor (HH57AC074) is a 10 to
20 mA device used to me asure the outdoor-air tempera ture.
The outdoor-air tempera ture is used t o determine whe n the
EconoMi$er IV can be used for free cooling. The sensor is
factory-installed on the EconoMi$er IV in the outdoor
airstream. See Fig. 21. The ope rating range of temperatu re
measurement is 40 to 100 F.
Supply Air Temperature (SAT) Sensor
The supply air temperature sensor is a 3 K thermistor
located at the inlet of the indo or fan. See Fig. 31. This sensor
is factory installed. The operating range of temperature
measurement is 0° to 158 F. See Table 3 for sensor temperature/resistance values.
The temperature sensor looks like an eyelet terminal with
wires running to it. The sensor is located in the “crimp end”
and is sealed from moisture.
Outdoor Air Lockout Sensor
The EconoMi$er IV is equipped with an ambient t empera-
ture lockout switch located in the outdoor airstream which is
used to lockout the compressors below a 42 F ambient temperature. See Fig. 21.
—16—
Loading...