Johnson Controls Unitary Products PHE4 Series, Руководство по установке

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5020803-UIM-C-0715
Johnson Controls Unitary Products 17
During the defrost mode, the reversing valve is energized, the outdoor
fan is de-energized, the compressor is energized, and the defrost con-
trol will provide a 24 volt signal from terminal “Wout” to energize electric
heat stage 1, if the unit is so equipped.
For trouble shooting purposes, the defrost cycle can be manually initi-
ated by shorting the “TEST” pins together for 5 seconds while “Y” is
energized. After removing the short, defrost will terminate normally
during the “TEST” mode.
Heat Pump Safety Switch Operation
The unit is equipped with a safety package. The refrigeration system
will be protected against high refrigerant pressure and a loss of charge
switch. If either of these safety switches open, the unit will be shut off
for the 5 minute anti-short cycle time. Once this has expired, a six hour
elapsed run timer begins. If a second opening of a safety switch occurs
during this six hour period, the compressor will be locked out.
Resetting the lockout function is accomplished by:
1. Removing power from the control's thermostat 1st stage (Y) input for
longer than 2 seconds.
2. Removing power from “R” for more than 2 seconds.
3. Shorting the “TEST” pins together for more than 2 seconds while
“Y” is energized.
4. Shorting the “TEST” pins together for more than 5 seconds while
“Y” is de-energized.
Table 14: Demand Defrost Selection
Unit Pin Position
036, 048, 060 1
024, 030 2
042 3
024 Thru 060 2
024 Thru 060 2
FIGURE 9: Demand Defrost Control
DEFROST CURVE
SELECTION JUMPER
STATUS LED
TEST PINS
A0349-001
Table 15: Test Pins
Test Pin Shorted Y no Y
> 2 sec Bypass ASCD Show error coder
> 5 sec Forced defrost Clear error codes
Table 16: Fault Codes
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 loss of charge switch lockout (last mode of
operation was normal compressor)
5 Flashes
Low Voltage (<19.2VAC) preventing further relay
outputs for > 2 seconds
6 Flashes
Low Voltage (<16VAC) stopped current relay outputs
for > 2 seconds
7 Flashes
Liquid Line sensor failure (Open or Shorted) 8 Flashes
Outdoor ambient sensor failure (Open or Shorted) 9 Flashes
Control Failure 10 Flashes