Johnson Controls RHP150 Series User Manual

Figure 21: Demand defrost control module
Fault code display
The control provides status codes using the LED. Status
codes indicate the state of operation of the unit but do
not represent a fault. The table below describes the LED
displayed during status codes. Status codes will not be
displayed when a fault code is present.
Table 66: Status code display
No power to the
control
No faults active
Nothing
energized
OFF
Compressor
operation active
No faults active
M energized
ON
Control normal
operation –
no call for
compressor
No faults active
Y not present
2 s ON/2 s OFF
Control normal
operation – in
ASCD period
No faults active,Y
present, ASCD
timer not expired
0.1 s ON/0.1 s
OFF
The control provides fault codes using the Status LED.
Table 67 describes the LED displays during fault codes.
Unless otherwise specified, the control provides flashes
that are a 1/3 s on and 1/3 s off for fault codes. The
control only displays a single fault code on the LED. The
control displays the fault code on the LED repeatedly with
a 2 s off period between repetitions of the fault code. If
multiple fault codes are present at the same time, the LED
displays only the most recent fault.
Table 67 shows the number of flashes for the specified
code. For instance, a flash code entry of 3 indicates that
the control energizes the output for three 1/3 s on, 1/3 s
off flashes, waits 2 s, then energizes the output for three
more 1/3 s on, 1/3 s off flashes and repeats.
Table 67: Faults
Description STATUS LED
High-pressure switch fault
(not in lockout yet)
2 Flashes
System in high-pressure
switch lockout (last mode
of operation was normal
compressor)
3 Flashes
System in high-pressure
switch lockout (last mode
of operation was defrost)
4 Flashes
System in low-pressure
switch lockout (last mode
of operation was normal
compressor)
5 Flashes
Low voltage (<19.2 VAC)
preventing further relay
outputs for > 2 s
6 Flashes
Low voltage (<16 VAC)
stopped current relay
outputs for > 2 s
7 Flashes
Coil sensor failure (open or
shorted) - Comp. allowed/
lockout
8 Flashes
Outdoor ambient sensor
failure (open or shorted) -
Compressor allowed if coil
is > 32°F
9 Flashes
Control failure 10 Flashes
Installation Manual: R-410A Outdoor Split-System Heat Pump - YH2F, THF2, RHP150 Series38
Johnson Controls Ducted Systems

Johnson Controls RHP150 Series Specifications

General

Brand	Johnson Controls
Model	RHP150 Series
Category	Heat Pump
Language	English