Справочник Пользователя для American Aldes DHV-150H

 

13

 
The ventilation timer controls the fan and the motorized 
fresh air damper. When the ventilation timer is 
activated, the central conditioning unit will circulate the 
indoor air, and bring in fresh air from outside. The 
ventilation timer should be set for the required 
ventilation of the residence. The home should be 
ventilated with fresh air as suggested by applicable 
codes and standards. 
 
If the DHV-150H fails to ventilate as expected, check 
that the time on the timer is correct. For the timer to 
carry out the program schedule, the slide switch in the 
upper left corner on the timer must be set to “AUTO”. 
The slide switch in the upper right corner of the DHV-
150H must be set to “RUN”. Also check the programs on 
the timer to be sure that the timer is calling for 
ventilation at the correct times. If the timer fails to 
operate or operates erratically, reset the timer; see 
section 3.5 of this manual. 
 

 

 
The defrost thermostat is attached to the refrigerant 
suction tube between the accumulator and the 
compressor. It will automatically shut the compressor off 
if the low side refrigerant temperature drops due to 
excessive frost formation on the evaporator coil. The 
fan will continue to run, causing air to flow through the 
evaporator coil and melt the ice. When the ice has 
melted, the evaporator temperature will rise and the 
thermostat will restart the compressor. 
 

 

 
The ventilation timer controls the electric ventilation 
damper. The damper will open when the ventilation 
timer is activated to allow fresh air into the structure 
through the 6” diameter fresh air inlet duct. The electric 
ventilation damper will remain closed when the 
ventilation timer is not activated to prevent over-
ventilating the structure when the unit is dehumidifying 
or recirculating the indoor air. 
 
The electric ventilation timer operates on 24 Vac from 
the control circuit. DO NOT connect high voltage to the 

damper motor or damage to the motor may result. DO 
NOT force the blade of the damper by hand or damage 
to the damper motor may result. 
 
If the electric ventilation damper fails to operate: 

1.  Check that the wiring is correct and that voltage is 

present at the damper motor. 

2.  Check for any obstruction inside the damper. 

If the electric ventilation damper fails to operate after 
performing these checks, it must be replaced. 
 

 
If the low side refrigerant pressure drops to 15 PSIG, the 
low-pressure control opens and shuts off the compressor 
and fan. It is an automatically reset control. It will close 
when the refrigerant pressure rises to 35 PSIG. Its 
primary function is to prevent damage to the 
compressor if a leak develops in the refrigeration 
system. It may also open if the unit is A) installed in a 
cool area (below 50 F) or B) installed where it is below 
40 F and then started. Under these conditions, the unit 
will restart within several minutes. Until the unit warms 
up, it may cycle several times. 
 

 
An optional condensate pump kit is available from the 
factory for use with the DHV-150H. Condensate is 
automatically pumped to a remote location when the 
water level in the pump's reservoir rises to close the 
float switch. 
 
The pump also contains a safety float switch. The 
white leads from this switch extend from beneath the 
pump cover. This switch should be installed in series 
with the field wire that connects the blue (#5) lead from 
the DHV-150H to the blue (#5) lead on the control 
panel. 
 
If the pump fails, this switch opens the compressor 
control circuit and stops water production before the 
reservoir overflows. The DHV-150H will continue to 
ventilate or circulate air as normal, but will not 
dehumidify until this switch closes.