Table
System Response — Single Compressor Unit
THERMOSTAT INPUT | ECONOMIZER FUNCTION |
| 48HE, HJ UNIT OPERATION | ||||
H | Y1 | Y2 | OAT. < Economizer Set Point | Economizer | Comp. 1 | Subcooling Mode | Hot Gas Reheat Mode |
Off | — | — |
| Normal Operation |
| ||
On | On | On | No | Off | On | Yes | No |
On | On | Off | No | Off | On | Yes | No |
On | On | On | Yes | On | On | Yes | No |
On | On | Off | Yes | On | On | No | Yes |
On | Off | Off | No | Off | On | No | Yes |
NOTE: On a thermostat call for W1, all cooling and dehumidification will be off.
LEGEND
OAT
Fan Motor Bearings
Fan motor bearings are permanently lubricated. No further lubrication is required. No lubrication of
Evaporator Fan Belt Adjustment
Inspect evaporator fan belt for wear, proper belt tension, and pulley alignment as conditions require or at the beginning of each heating and air conditioning season. Refer to Step 7 - Adjust Evaporator Fan Speed for adjustment and alignment procedures.
Step 3 —Condenser-Fan Adjustment
Shut off unit power supply. Remove
50HE,HJ
C06046
Fig. 56 --- Separating Coil Sections
4.Remove device holding coil sections together at return end of condenser coil. Carefully separate the outer coil section 3 to 4 in. from the inner coil section. (See Fig. 57.)
5.Use a water hose or other suitable equipment to flush down between the 2 coil sections to remove dirt and debris. Clean the outer surfaces with a stiff brush in the normal manner.
6.Secure the sections together. Reposition the outer coil section and remove the coil corner post from between the top panel and center post. Install the coil corner and center posts. Replace all screws.
Condensate Drain
Check and clean each year at the start of the cooling season. In winter, keep the drain dry or protect it against
Filters
Clean or replace at the start of each heating and cooling season, or more often if operating conditions require it. Replacement filters must be the same dimensions as the original filters.
Outdoor-Air Inlet Screen
Clean the screen with steam or hot water and a mild detergent. Do not use disposable filters in place of screens.
Step 2 —Lubrication
Compressor
The compressor is charged with the correct amount of oil at the factory.
UNIT | FAN HEIGHT (in.) — “A” |
2.75 | |
007 (460 v) | 3.50 |
C06138
Fig. 57 --- Condenser-Fan Adjustment
Step 4 —EconoMi$er IV Adjustment
Refer to Optional EconoMi$er IV and EconoMi$er2 section.
Step 5 —Refrigerant Charge
Amount of refrigerant charge is listed on unit nameplate (also refer to Table 1). Refer to HVAC Servicing Procedures literature available at your local distributor and the following procedures.
Unit panels must be in place when unit is operating during charging procedure. Unit must operate a minimum of 10 minutes before checking or adjusting refrigerant charge.
No Charge
Use standard evacuating techniques. After evacuating system to 500 microns, weigh in the specified amount of refrigerant. (Refer to Table 1 and unit information plate.)
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