Number One
Air Conditioning
l\^er
#Carrier Parkway • Syracuse NY 13221
mstaflation, Start-Up and Service Instructions
Single-Package Cooling Units
INSTALLATION
Rigging and Unit Placement — Inspect unit for transportation damage. File claim with transporta tion agency. Do not remove shipping skid until unit is ready to be set in final location. 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 reference. See Fig. 1 for additional information. Unit weight is shown in Table 1.
Fig. 1 — Rigging Details
Units are designed to be hoisted only. However, units with optional shipping skids may be moved with a fork truck. Refer to Accessory Roof Curb Installation Instructions for additional information as required.
Roof Curb — Assemble and install as described in instructions shipped with this accessory. Accessory roof curb and information required to field fabricate a roof curb of 2-in. x 14-in. planks is shown in Fig. 2. Install insulation, cant strips, roofing and flashing as required. For unit drains to function properly, curb must be level or within tolerances shown in Fig. 3.
Roof Mount — Check building codes for weight distribution requirements. Unit weight is shown in Table 1.
Slab Mount — Provide a level concrete slab that extends beyond unit cabinet at least 6 inches. Make a slab 8 in. thick with 4 in. above grade. Use gravel apron in front of condenser air inlet to prevent grass and foliage from obstructing airflow.
Alternate Unit Support Methods — Where the preferred curb or slab mount cannot be used, support unit with sleepers on perimeter, using curb support area. However, if sleepers cannot be used, support long sides of unit (dimension “A,” Fig. 4) with 4-in. X 4-in. pads equally spaced on each side. Unit may sag if supported by corners only.
Positioning — Unit condenser air inlets and outlets may be located in any compass direction since they are not affected by wind. Provide clearances around and above unit for airflow, safety and service access (Fig. 4).
Do not install unit in an indoor location. Do not locate air inlets near exhaust vents or other sources of contaminated air.
Although unit is weatherproof, guard against water from higher level runoff and overhangs.
Field-Fabricated 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 all roof openings with flashing and mastic in accord ance with applicable codes.
Carrier Corporation 1983 |
Form 50DL-1SI |
Roof Curb Dimensions
Insulate ducts passing thru unconditioned spaces and cover with a vapor barrier.
Maintain one-in. minimum clearance between supply air duct and any combustible material for at least 3 ft of duct run from unit.
Unit is shipped set up for thru-the-bottom duct connections. Ductwork openings are shown in Fig. 4.
Economizer Section
ECONOMIZER HOODS INSTALLATION (Fig. 5) — The economizer mechanism and all electrical connections are factory installed and adjusted except as noted below. Hood assembly, outdoor air inlet screens and required hardware are shipped separately and must be field installed. Units have 2 hood assemblies.
Install economizer hoods and enthalpy control as follows:
1.Loosen unit top panel sheet metal screws above outdoor air inlet opening.
2.Assemble hood top panel, side panels and support channel.
3.Insert hood flange between unit top panel flange and unit. Slots are provided in hood flange to clear sheet metal screws. Tighten sheet metal screws. Apply RTV sealant to surfaces as shown in Fig. 5.
4.Secure hood side panels to outdoor air opening flanges, using screws provided.
5.Install hood support bracket(s) between U- channel and support channel.
6.Install screen retainer on support channel, using screws in the slots. Do not tighten.
8.Remove enthalpy control assembly from ship ping location on horizontal deck in return air filter compartment.
9.Using 4 no. 10-1/2 screws from envelope in con trol assembly junction box, mount enthalpy control assembly to inside of economizer hood side panel nearest condenser section (Fig. 4).
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Fig. 3 — Unit Leveling Tolerances
10.Route the red and yellow wires thru knockout in side plate. Wrap end of blue wire with electrical tape. Using wire connectors from envelope in
junction box, wire enthalpy control assembly as shown in Fig. 6. Use strain reliefs from envelope on side plate and junction box.
11.Install outdoor air screens.
12.Push retainer snugly against screens and tighten screws.
Exhaust Air Hood Installation — The optional power exhaust package hood damper assemblies and required sheet metal screws are shipped in the compartment at right of indoor air fan motor com partment. Using screws provided, install a hood damper assembly over each exhaust air opening as shown in Fig. 4. Power exhaust is applied only to economizer units using bottom duct connections. Exhaust fan and motor assembly is factory wired and adjusted. Refer to Service, Power Exhaust Air Fan Adjustment if required.
Indoor Air Fans — The fan belt and pulleys are factory installed and adjusted. If required, adjust as described in Service, Indoor Air Fan Adjustment.
Condensate Drains — See Fig. 4 for drain loca tions. Condensate drain is open to atmosphere and must be trapped. Install a trapped drain line at con nection to be used. Trap must be at least 3in. deep and made of flexible material or be installed to pre vent freeze-up.
Condensate drain pan under unit is fitted with a one-in. FPT coupling. A gasket is shipped taped to this drain. Install gasket in unit basepan opening or alternate opening on end of unit.
Field Power Supply — Unit is factory wired for voltage shown on nameplate. The main power ter minal block is suitable for use with aluminum or copper wire. Units have circuit breakers for com pressors, fan motors and control circuit. If required by local codes, provide an additional disconnect switch.
If an external electrical source is used, unit must be electrically grounded in accordance with local codes, or in the absence of local codes, with the National Electrical Code, ANSI Cl-1978.
All field wiring must comply with National Elec trical Code and local requirements.
Install conduit connector in unit basepan or side panel openings provided as shown in Eig. 4. Route power lines thru connector to terminal connections in control box as shown in Fig. 8, 9 and 10.
Affix crankcase heater sticker to unit disconnect switch.
Voltage to compressor terminals during com pressor operation must be within voltage range indicated on unit nameplate. Also, see Tables 2 and 3. Phases must be balanced within 2%. Contact local power company for correction of improper voltage or phase unbalance. Failure due to operation of unit on improper line voltage or with excessive phase unbalance constitutes abuse and may cause damage to unit electrical components.
Field Control Wiring
STANDARD UNIT (WITHOUT ENERGY MANAGEMENT OPTION) — Install a Carrierapproved accessory electronic thermostat on a sub base (or a transmitter on subbase if remote sensor is used) per installation instructions included with the accessory. Note that the subbase must be used oh constant volume units without night setback. Locate thermostat, or remote sensor, if used, in the condi tioned space where it will sense average temperature.
Route thermostat cable or equivalent single leads of no. 18 AWG colored wire from subbase terminals thru connector on unit to low-voltage connections in main control box as shown on unit wiring dia gram and in Pig. 8.
UNITS WITH ENERGY MANAGEMENT OPTION — In addition to the standard control box, units with Energy Management option are also equipped with a remote box and a night setback box. The remote box contains a 7-day time clock, a bypass switch that can manually bypass the time clock for up to 5 hours, 6 indicator lights and 2 terminal blocks for field wiring connections. Mount this box remote from the unit in an indoor or
Table 1 — Physical Data
UNIT 50DL |
044 |
054 |
|
064 |
OPERATING WEIGHT (lb) |
5406 |
6100 |
|
6485 |
Base Unit |
|
|||
Economizer |
225 |
250 |
|
250 |
Roof Curb |
200 |
225 |
|
225 |
COMPRESSOR |
|
Serviceable, Hermetic |
2 06E |
|
Quantity...Type |
2 06E |
2. .06E* |
|
|
Quantity Cylinders (ea)...Rpm |
4 1750 |
4 6 1750 |
|
6 1750 |
Capacity Steps (%) (Standard) |
50, 100 |
60, 100 |
|
50, 100 |
With Accessory Unloaders |
25, 50, 75, 100 |
20, 40, 60, 80, 100 |
|
16, 33, 50, 67, 83, 100 |
Capacity Steps (%) (Variable Volume) |
25, 50, 75, 100 |
20, 40, 60, 80, 100 |
|
16, 33, 50, 67, 83, 100 |
With Electric Unloaders |
|
|||
|
|
|
|
|
REFRIGERANT CHARGE |
Type 22; Controlled by Thermostatic Expansion Valve |
|||
System 1...System 2 (lb) |
37 0 37 0 |
53 0 42 0 |
|
81 0 81 0 |
OUTDOOR AIR FANS |
|
Direct Driven, Propeller Type |
4 30 |
|
Quantity...Diameter (in.) |
3 30 |
4 30 |
|
|
Nominal Cfm |
21,000 |
28,000 |
|
31,000 |
Motor Hp...Rpm |
1 1050 |
1 1050 |
|
1 1150 |
CONDENSER COIL |
3 158 |
3 158 |
|
4 15.8 |
Rows...Fins/in. |
|
|||
Total Face Area (sq ft) |
61 0 |
81 5 |
|
81 25 |
INDOOR AIR FANt |
|
Belt Driven, Centrifugal Type |
4 15x11 |
|
Quantity...Size (in.) |
4 15x9 |
4 15x11 |
|
|
Maximum Allowable Rpm |
1300 |
1300 |
|
1450 |
Nominal Cfm |
16,000 |
20,000 |
|
24,000 |
Standard Motor and Drive |
|
20 |
|
|
Motor Hp |
15 |
|
25 |
|
Motor Frame Size |
254T |
256T |
|
284T |
Single Speed |
|
|||
Two Speed |
284T |
286T |
|
286T |
Fan Pulley Pitch Diameter (in.) |
10 6 |
106 |
|
80 |
Fan Pulley Bore |
I’Me |
I’Me |
|
1750 |
Single-Speed Motor Rpm |
1750 |
1750 |
|
|
Two-Speed Motor Rpm |
1750/1170 |
1750/1170 |
|
1750/1170 |
Motor Pulley Pitch Diameter (in.) |
6 5 |
6 5 |
|
56 |
Pulley A |
|
|||
Pulley B |
5 6 |
60 |
|
60 |
Resulting Fan Rpm |
1073 925 |
1073 ..991 |
|
1225 1312 |
Single-Speed with Pulley A. .B |
|
|||
Two-Speed with Pullley A...B |
1073/751 |
1073/751 |
|
1225/817. |
925/617 |
991/661 |
|
1312/875 |
|
|
|
|||
Alternate Motor and Drive |
20 |
|
|
|
Motor Hp |
25t |
|
30t |
|
Motor Frame Size |
256T |
284T |
|
286T |
Single Speed |
|
|||
Two Speed |
286T |
286T |
|
— |
Fan Pulley Pitch Diameter (in.) |
80 |
80 |
|
10 6 |
Fan Pulley Bore |
I'Me |
I'Me |
|
1750 |
Single-Speed Motor Rpm |
1750 |
1750 |
|
|
Two-Speed Motor Rpm |
1750/1170 |
1750/1170 |
|
1750/1170 |
Motor Pulley Pitch Diameter (in.) |
5 3 |
5 3 |
|
8 0 |
Pulley A |
|
|||
Pulley B |
5 6 |
5 6 |
|
** |
|
|
|||
Resulting Fan Rpm |
« |
1159 1225 |
|
1321 — |
Single-Speed with Pulley A...B |
1159 1225* |
|
||
Two-Speed with Pulley A...B |
1159/773. |
1159/773. |
|
1321/881 |
1225/817 |
1225/817 |
|
|
|
|
|
|
||
EXHAUST FAN MOTOR Quantity...Hp |
2 3 |
2 3 |
|
2 3 |
EVAPQRATQR CQIL |
4 15 |
4 15 |
|
4 139 |
Rows...Fins/in |
|
|||
Total Face Area (sq ft) |
30 2 |
35 4 |
|
35 4 |
ELECTRIC RESISTANCE HEATERS |
Open Nichrome Wire Elements with Multiple-Stage Control |
|||
HeatikW |
|
See Electrical Data tables |
|
|
INDQQR AIR FILTERS |
|
|
|
|
No. ...Size |
|
9 20x25 |
|
9 20x25 |
Standard; 2-in Throwaway |
27 16x25 |
|
||
21 16x25 |
|
21 16x25 |
||
|
6 12x24 |
|
||
Bag Type; 12-in. (Optional) |
7 12x24 |
|
|
|
6 24x24 |
7 24x24 |
|
|
|
*Unit contains one 06EA250 and one 06EA275 compressor tStandard fan motor supplied with standard fan drive pulleys and belts; alternate fan motor supplied with alternate fan drive pulleys and belts Other combinations are field supplied Pulley A is installed in unit; Pulley B is shipped with unit (044 and 054).
JDue to large frame size, the 25-hp, 208-230-volt and 30-hp motors are available in single speed only
**The 50DL064 alternate drive is supplied with Pulley A only
288
Fig. 4 — Base Unit Dimensions
5 |
288 |
APPLY RTV SEALANT TO AREAS SHOWN
Fig. 5 — Economizer Outdoor Air
Inlet Hood Assembly
Fig. 6 — Enthalpy Control Assembly
Fig. 7 — Psychrometric Chart for Enthalpy Control
MAIN POWER TERMINAL BLOCK IN UNIT CONTROL BOX OR HEATER COMPARTMENT
^
FIELD POWER |
|
|
SUPPLY |
TB4 |
MAIN CONTROL BOX |
|
I I
THERMOSTAT SUBBASE
NOTE Thermostat subbase required.
Fig. 8 — Field Wiring Connections
Constant Volume Units Without
Energy Management Option
weathertight space. The night setback box contains a terminal block for field wiring connections, a morning warmup thermostat and the setback/ setup module. The night setback box remains in the unit. Shipping locations of remote box and permanent location of night setback box are shown in Fig. 11.
1. Remove remote box and mount in a restricted access area (indoors or in a weathertight space).
2. Run separate 115-volt, 60-Hz (230-volt, 50-Hz) power to the remote box per Fig. 9. Use no. 14 AWG wire or larger and a proper field-supplied electrical connector.
Install a Carrier-approved accessory electronic thermostat or transmitter if remote sensor is used (subbase not required) according to the installa tion instructions included with the accessory. Note that the subbase is not used on units with the Energy Management option. Locate the ther mostat or remote sensor, if used, in the condi tioned space where it will sense average temperature.
Route thermostat cable or equivalent single leads of no. 18 AWG eolored wire from thermostat or transmitter terminals thru connector on unit to low-voltage (TB4) connections in main control box as shown on unit label wiring diagram and in Fig. 9.
4.Run 24-volt wires between the remote box and night setback box per Fig. 9. Use no. 18 AWG wire for lengths up to 100 feet. Local codes may dictate use of conduitfor low voltage. Knockouts are provided in the night setback box and in the fan deck separating heating section from section containing the night setback box (Fig. 11). A watertight connector is installed in side of unit. Two rubber grommets are taped inside the night setback box. Use grommets in knockouts in fan deck and night setback box.
288
|
|
|
|
MAIN POWER TERMINAL |
L3 |
L2 |
|
LI |
BLOCK IN UNIT CONTROL |
|
BOX OR HEATER |
|||
~r~ |
|
|
|
COMPARTMENT |
I |
|
|
I I
FIELD POWER
SUPPLY
NOTE Subbase not used
Fig. 9 — Field Wiring Connections |
Constant Volume Unit With Energy Management Option |
Fig. 10 — Field Wiring Connections for 50DL VAV
Fig. 11 — Shipping Location — Remote Box
UNITS WITH VARIABLE VOLUME OPTION
— Units do not use room thermostats or sensors. In addition to the main control box, units are equipped with a remote box and a variable volume box. Remote box is described above (Units With Energy Management Option). The variable volume box (Fig. 12) contains a microprocessor, a morning warmup thermostat, a time-delay relay, 3 unloader relays, an interlock relay, a night relay, a day relay
and a terminal block for field wiring. Shipping loca tion of remote box is shown in Fig. 11.
1.Remove the remote box and mount in a restricted access area (indoors or in a weathertight space).
2.Run separate 115-volt, 60-Hz (230-volt, 50-Hz) power to the remote box per Fig. 10. Use no. 14 AWG wire or larger and proper electrical con nector (field supplied).
3.Run 24-volt wires between remote box and variable volume box per Fig. 10. Use no. 18 AWG wire for lengths up to 100 feet. Run wire in con duit to unit if local codes dictate. Knockouts are provided in the variable volume box and the fan deck separating heating section from section con taining the variable volume box (Fig. 11). Water
tight connectors are installed in unit cornerpost and side of unit. Two rubber grommets are shipped taped inside variable volume box. Use grommets in knockouts in fan deck and variable volume box.
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4.If the unit is equipped with electric heat, the room terminals must be controlled to go fully open when unit goes into heating. An interlock relay is provided in the variable volume box. When unit goes into heating, the interlock relay energizes providing switch closure to open the room ter minals. Field connections for the interlock relay are terminals 1 and 2 of the terminal block (TB10) located in upper left corner of electric heat sec tion (Fig. 11).
Route field-supplied power wiring thru watertight connector supplied in unit cornerpost. Make TBIO connections as shown in Fig. 13.
Return Air Filters — Check that return air filters are of the correct type and size and installed in unit filter racks. Filter data is shown in Table 1. Do not operate unit without return air filters.
Fig. 13 — Morning Warmup Interlock
Outdoor Air Inlet Screens — Outdoor air inlet screens must be in place before operating unit.
Compressor(s) — Loosen compressor holddown bolts until sidewise movement of the washer under each holddown bolt head occurs. Do not loosen completely as bolts are self-locking and will main tain their adjustment.
Open the compressor discharge and suction service valves. Replace and tighten valve caps to prevent leaks.
Liquid Line Service Valve — Open the liquid line service valve. Replace and tighten valve cap to prevent leaks.
Low Ambient Compressor Lockout (Fig. 14) — All units are equipped with an adjustable low ambient lockout thermostat to lock off the compressor(s) at low outdoor air ambients. Thermostat is located in the main control box. Setting will depend on specific installation but should be approximately 50 F on VAV units and 55 F on constant volume units.
Convenience Outlet — All units are equipped with a 115-volt convenience outlet for handling small power load or service light. See Fig. 14.
CIRCUIT BREAKERS |
CONVENIENCE OUTLET LOW AMBIENT LOCKOUT |
LOGIC PANEL |
|
THERMOSTAT |
|
Fig. 14 — Control Box
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