ECR RetroAire R90C Installation, operation & maintenance manual - page 17
Figure 8 TEST Jumper
(selects heat pump or
straight cooling)
Electrical Connections
WARNING
Electrical shock hazard. Disconnect all power
before removing chassis, performing any cleaning,
servicing, or maintenance. Failure to do so could
result in death or serious injury
!
Refer to wiring diagram attached to unit for wiring details.
All field wiring shall conform to requirements of authority
having jurisdiction or in absence of such requirements:
• United States
• National Electrical Code, ANSI/NFPA 70
• Canada
• CSA C22.1 Canadian Electrical Code Part 1.
UNITS RATED 208/230V
— RetroAire unit is wired for
230v primary voltage from manufacturer.
Transformer must be rewired by installer if jobsite voltage
is 208v.
Change transformer tap from orange to red. See wiring
diagram for details.
Setting Control Board Jumpers
Control board has two sets of factory installed jumper pins
on control board,
HP
jumper and
TEST
jumper.
HP Jumper —
to select heat pump or straight cooling
Pins determine whether unit operates as straight cooling or
as heat pump. See Figures 8 and 9.
• Jumper right pin to center pin for heat pump
operation.
• Jumper left pin to center pin for straight cooling
operation.
TEST Jumper —
to select normal or test mode
Jumper is for use in testing only. See Figures 9 and 10.
• When
JUMPER
pins are jumpered together, all
timers are eliminated (example — anti-short cycle,
purge, etc.).
• Used mainly used for production line testing. May be
used for field testing.
• Units are factory set with jumper on only one pin
(normal operation position).
NOTICE
Do not leave unit operating with TEST jumper in
TEST position.
Heat Pump
Mode
(jumper center
& Btm. pins)
INSPECTION & START-UP
Straight
Cool Mode
Mode
(jumper center
& top pins)
HP
HP
HP
Figure 9 TEST Jumper
(selects heat pump or
straight cooling)
TEST
Normal operation
(pins not jumpered)
Test mode
(pins jumpered)
P/N 240010330, Rev. A [10/15/2013]
17
Made in USA