530.18-N8Y
The supply and return air duct systems should be designed for the CFM and static requirements of the job. They should NOT be sized to match the dimensions of the duct connections on the unit.
CAUTION: When fastening ductwork to the side duct flanges on the unit, insert the screws through the duct flanges only. DO NOT insert the screws through the casing.
Outdoor ductwork must be insulated and waterproofed.
Refer to Figure 9 for information concerning side and bottom supply and return air duct openings.
FILTERS
1" filters are supplied with each unit. 2" replacement filters may be used with no modification to the filter racks. Filters must always be installed ahead of the evaporator coil and must be kept clean or replaced with same size and type. Dirty filters will reduce the capacity of the unit and will result in frosted coils or safety shutdown. Minimum filter area and required sizes are shown in Table 5.
CONDENSATE DRAIN
Plumbing must conform to local codes. Use a sealing compound on male pipe threads. Install a condensate drain line from the 3/4" PVC female connection on the unit to spill into an open drain.
NOTE: The condensate drain line MUST be trapped to provide proper drainage. See Figure 1.
FIG. 1 - RECOMMENDED DRAIN PIPING
SERVICE ACCESS
Access to all serviceable components is provided by the following removable panels:
∙Scroll compressor compartment
∙Burner compartment
∙Blower compartment
∙Main control box
∙Filter compartment
∙Motor access (on units with belt-drive option)
Refer to Figure 9 for location of these access panels.
CAUTION: Make sure that all screws are replaced on the unit to maintain an air-tight seal.
THERMOSTAT
The room thermostat should be located on an inside wall approximately 56" above the floor where it will not be subject to drafts, sun exposure, or heat from electrical fixtures or appliances. Follow manufacturer’s instructions enclosed with thermostat for general installation procedure. Color coded insulated wires (#18 AWG) should be used to connect thermostat to unit. See Figure 2 for wiring details.
NOTE: If the unit has an economizer, remove jumper J1 from terminals 8 and 10 on the relay board to prevent simulta- neous operation of the scroll compressor and the econo- mizer. If you want to energize the scroll compressor for supplemental cooling during the economizer operation, use a thermostat with two stages of cooling.
POWER AND CONTROL WIRING
Field wiring to the unit must conform to provisions of the National Electrical Code (NEC), ANSI / NFPA 70-1987 (in U.S.A.) current Canadian Electric Code (CEC) C22.1 (in Canada), and / or local ordinances. The unit must be electrically grounded in accordance with the N.E.C. ANSI / NFPA 70 or local codes.
Voltage tolerances which must be maintained at the compressor terminals during start-up and running conditions are indicated on the unit Rating Plate and Table 1.
The internal wiring harness furnished with this unit is an integral part of a UL and CGA design certified unit. Field alteration to comply with electrical codes should not be required.
A disconnect switch should be field provided for the unit. The switch must be separate from all other circuits. Refer to Figure 9 for installation location. If any of the wire supplied with the unit must be replaced, replacement wire must be of the type shown on the wiring diagram.
Electrical lines must be sized properly to carry the load. USE COPPER CONDUCTORS ONLY. Each unit must be wired with a separate branch circuit fed directly from the meter panel and properly protected.
CAUTION: When connecting electrical power and control wir- ing to the unit, waterproof type connectors MUST BE USED so that water or moisture cannot be drawn into the unit during normal operation. The above waterproofing conditions will also apply when installing a field-supplied disconnect switch.
Refer to Figure 2 for typical field wiring and to the appropriate unit wiring diagram for control circuit and power wiring information.
BLOWER SPEED SELECTION
Three blower motor speeds are available on the direct-drive units. The speed selection for the direct-drive units is determined by the CFM and ESP requirements of the applications. All units with belt-drive option have an adjustable motor pulley to achieve the above conditions.
All direct-drive units with 208/230 voltage are shipped with the wire labeled #116 connected to the "HIGH" speed tap on the blower motor. If a lower blower motor speed is desired, this wire should be moved to the "MED" or "LOW" speed tap on the motor for the speed desired.
All direct-drive units with 460 and 575 voltage are shipped with the wire labeled #116 connected to the "HIGH" speed tap on the blower motor. If the medium speed is required, connect wire #116 to the "MED" speed tap and the blue motor lead to the "HIGH" speed tap. If the low speed is required, connect wire #116 to the "LOW" speed tap, the blue motor lead to the "HIGH" speed tap and the orange motor lead to the "MED" speed tap.
SCROLL COMPRESSOR
These units are shipped with the scroll compressor mountings factory-adjusted and ready for operation.
CAUTION: Do Not loosen the scroll compressor mounting bolts.
COMBUSTION DISCHARGE
The products of combustion are discharged horizontally through a screened opening on the gas heat access panel.
TABLE 2 - GAS HEAT APPLICATION DATA
| | | | | | | |
Input | Output | Available | Gas Rate | 1 | Temp. Rise °F |
Capacity, | Capacity, | on | | At Full Input | 2 |
(Ft.3/Hr.) | | |
(Mbh) | (Mbh) | Models | | | Min. | Max. |
50 | 40 | 3 Ton | 47 | | 15 | 45 |
75 | 60 | 4 Ton | 70 | | 25 | 55 |
100 | 79 | 3/5/6 Ton | 93 | | 40/25/25 | 70/55/55 |
125 | 99 | 4/5/6 Ton | 116 | | 45/35/35 | 75/65/65 |
NOTE: Gas Heaters are shipped available for natural gas, but can be converted to L.P. with Kit Model No. 1NP0434. All furnaces meet the latest California seasonal efficiency requirements.
1Based on 1075 Btu/Ft3.
2The air flow must be adjusted to obtain a temperature rise within the range shown.
