R e s i d e n t i a l H & V - 6 0 H z H F C - 4 1 0 A
R e v. : 9 M a r c h , 2 0 1 1 B
20
G e o t h e r m a l H e a t P u m p S y s t e m s
Electrical - Line Voltage
Electrical - Line Voltage
All fi eld installed wiring, including electrical ground, must
comply with the National Electrical Code as well as all
applicable local codes. Refer to the unit electrical data for
fuse sizes. Consult wiring diagram for fi eld connections that
must be made by the installing (or electrical) contractor.
All fi nal electrical connections must be made with a length of
fl exible conduit to minimize vibration and sound transmission
to the building.
General Line Voltage Wiring
Be sure the available power is the same voltage and phase
shown on the unit serial plate. Line and low voltage wiring
must be done in accordance with local codes or the National
Electric Code, whichever is applicable.
WARNING!
CAUTION!
Unit Power Supply
(see electrical table for wire
and breaker size)
Connect the blue wire to:
H for High speed fan
M for Medium speed fan
L for Low speed fan
Medium is factory setting
Fan Motor
Figure 17: PSC Motor Speed Selection
WARNING!
Disconnect electrical power source to prevent
injury or death from electrical shock.
CAUTION!
Use only copper conductors for fi eld installed
electrical wiring. Unit terminals are not designed to accept
other types of conductors.
Blower Speed Selection – Units with PSC Motor
PSC (Permanent Split Capacitor) blower fan speed can be
changed by moving the blue wire on the fan motor terminal
block to the desired speed as shown in Figure 17. Optional
ECM motor speeds are set via low voltage controls (see
“ECM Blower Control”). Most units are shipped on the
medium speed tap. Consult specifi cations catalog for
specifi c unit airfl ow tables. Typical unit design delivers rated
airfl ow at nominal static (0.15 in. w.g. [37Pa]) on medium
speed and rated airfl ow at a higher static (0.4 to 0.5 in. w.g.
[100 to 125 Pa]) on high speed for applications where higher
static is required. Low speed will deliver approximately 85%
of rated airfl ow at 0.10 in. w.g. [25 Pa].
Power Connection
Line voltage connection is made by connecting the incoming
line voltage wires to the “L” side of the contactor as shown
in Figure 16. Consult Tables 4a through 4b for correct fuse
size.
208 Volt Operation
All residential 208-230 Volt units are factory wired for 230
Volt operation. The transformer may be switched to the 208V
tap as illustrated on the wiring diagram by switching the red
(208V) and the orange (230V) wires at the contactor terminal.
Special Note for AHRI Testing:
To achieve rated airfl ow for
AHRI testing purposes on all PSC products, it is necessary
to change the fan speed to “HI” speed. When the heat pump
has experienced less than 100 operational hours and the coil
has not had suffi cient time to be “seasoned”, it is necessary
to clean the coil with a mild surfactant such as Calgon to
remove the oils left by manufacturing processes and enable
the condensate to properly “sheet” off of the coil.
HWG Wiring (Split Units Only)
The hot water generator pump power wiring is disabled at
the factory to prevent operating the HWG pump “dry.” After
all HWG piping is completed and air purged from the water
piping, the pump power wires should be applied to terminals
on the HWG power block PB2 as shown in the unit wiring
diagram. This connection can also serve as a HWG disable
when servicing the unit.
Figure 16: TT/TS Single Phase Line Voltage
Field Wiring
