Reznor MAPSII Series REDA Users Manual - Manual (Page 10)

Form O-MAPS II, P/N 209179 R7, Page 10
Re-Heat Pump Reheat Cycle Performance
FIGURE 4B - Operating
Discharge Head Pressure vs
Outdoor Ambient Temperature
for Model RCA/RDCA/RECA
059, 077, 109, and 139
(NOTE: Size 025 and 037
discharge gauge pressures
are reduced approximately
10 pounds.)
FIGURE 4A - Operating
Discharge Head Pressure
vs Outdoor Ambient
Temperature for Model RCA/
RDCA/RECA 060, 078, 090,
108, 120, 164, 166, 184, and
198 and the Cooling Circuit
on All RDA/RDDA/REDA
Models
Re-Heat Pump TM Heat
Pump Refrigerant
System - Models
RDA, RDDA, and
REDA
Check Refrigerant Temperatures
Each circuit must be isolated for accurate temperature readings.
Check the cooling circuit superheat (temperature of the gaseous refrigerant in
the suction line leaving the evaporator coil). Refer to Paragraph 6, Step 11 on
page 15, for instructions on measuring superheat. Recommended superheat
range is 8-12°F (4.5-6.7°C).
Check the cooling circuit refrigerant subcooling (temperature of the line on the
leaving side of the condenser coil). Attach the sensor to the tubing. Acceptable
subcooling readings range from 18-22°F (10.1-12.3°C). Refer to Paragraph 6,
Step 11 on page 16, for instructions on measuring subcooling.
Typical Stand-Alone Re-Heat
Heat Pump Performance
(subtract 8 psig for liquid line pressure)
Typical RDA Performance with 55°F Air Entering
the Reheat Condenser (primary cooling enabled)
(subtract 8 psig for liquid line pressure)
Coil
Condition
Outside
Dry Bulb
Outside
Relative
Humidity
Suction
PSIG
Discharge
PSIG
Coil
Condition
Outside
Dry Bulb
Outside
Relative
Humidity
Suction
PSIG
Discharge
PSIG
Dry 65°F 30% 60 172 Dry 65°F 30% 59 165
Dry 75°F 30% 62 196 Dry 75°F 30% 62 168
Dry 80°F 30% 70 218 Dry 80°F 30% 65 170
Wet 75°F 70% 76 220 Wet 75°F 70% 73 178
Wet 80°F 70% 84 240 Wet 80°F 70% 80 184
Wet 85°F 70% 94 265 Wet 85°F 70% 90 191
Wet 90°F 70% 96 193
6.0 Check
Refrigerant
Pressure and
Temperatures
(cont'd)
Humid/Temperate Climate Systems
Operating Discharge Head Pressure vs Outdoor Ambient Temperature
50 55 60 65 70 75 80 85 90
180
200
220
240
260
280
300
320
340
360
380
400
Compressor Suction (psig)
Discharge Line (psig)
75°F Ambient (Dry Bulb)
85°F Ambient (Dry Bulb)
95°F Ambient (Dry Bulb)
115°F Ambient (Dry Bulb)
105°F Ambient (Dry Bulb)
Dry Climate Systems
Operating Discharge Head Pressure vs Outdoor Ambient Temperature
90 85 80 75 70 65 60 55 50
180
200
220
240
260
280
300
320
340
360
380
400
Compressor Suction (psig)
Discharge Line (psig)
75°F Ambient (Dry Bulb)
85°F Ambient (Dry Bulb)
95°F Ambient (Dry Bulb)
115°F Ambient (Dry Bulb)
1 05°F Ambient (Dry Bulb)
125°F Ambient (Dry Bulb)