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System Composite Diagram—Heat Pumps Above 10 KW
BU
See Note 1
NOTES:
EHR—Emergency Heat Relay (optional)
1. Outdoor thermostat (OT-1) should be the first to close and the
last to open.
WARNING
Goodman 26
REFRIGERANT UNDER PRESSURE!
• Do not overcharge system with refrigerant.
• Do not operate unit in a vacuum or at negative
pressure.
Failure to follow proper procedures may cause
property damage, personal injury or death.
WARNING
Goodman 19
REFRIGERANT UNDER PRESSURE!
Failure to follow proper procedures may cause property
damage, personal injury or death.
Goodman 24
CAUTION
Use care when handling scroll compressors. Dome
temperatures could be hot.
CAUTION
Goodman 25
POSSIBLE REFRIGERANT LEAK
To avoid a possible refrigerant leak, open the service
valves until the top of the stem is ¹⁄₈" (3.2 mm) from the
retainer.
8
Heat Pump
C W2 O
Y
R
W OR
Y
R
R
Y
OR
W
BU
#18 Gauge - 5 Wire
Outdoor Thermostat - 1
Outdoor Thermostat - 2
Outdoor Thermostat (Optional) Closed on Temperature Fall
#18 Gauge - 7 Wire Needed When 2 Outdoor Thermostats Are Used
Charge Refrigerant Lines
Conventional
Room Thermostat
W2
Y
O
C
G
R
E
R
BR
G
See
See
Note 3
Note 2
W
1
2
EHR
3
4
BU
2. Connect white wires and brown wires from air handler
together if OT-2 is not used.
3. Remove wire when using outdoor thermostat.
4. Terminal block markings.
Heat Pump—Heating Cycle
The proper method of charging a heat pump in the heat mode is
by weight with the additional charge adjustments for the line size,
line length and the other system components.
Charge Using Weigh-In Method (Fixed Orifice/Thermal
Expansion Device Systems)
Use this method if the system is void of refrigerant, or if the
outdoor ambient temperature is cool.
1. Locate and repair any leaks.
2. If necessary, recover the refrigerant from the condensing unit.
3. Conduct a leak check, then evacuate as previously outlined.
4. Weigh in the charge according to the total amount shown on
the condensing unit nameplate.
NOTE: If weighing facilities are not available or if the condensing
unit is being charged during warm weather, follow one of the
other charging methods.
IMPORTANT:
Refrigerant charge adjustment will be required for line set
lengths greater than 15 ft (4.6 m) and for non system-
matched evaporator coils.
The condensing unit is factory-charged with the proper
refrigerant charge amount for a matching evaporator and
15 ft of refrigerant line. Refer to the condensing unit rating
plate for the exact amount of this factory charge.
Adjustment of the refrigerant charge will be necessary based
on the system combination and line length. To adjust the
refrigerant size for increased line lengths, add the following
amount of refrigerant.
#18 Gauge - 7 Wire
Indoor Unit
Red
R
R
G
Green
G
White
W2
W
Brown
W3
BR
Blue
C
BU
See
Note 4
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