Question about Heating & Cooling
I am trying to connect an CRUISAIR SMXII power logic box mdl. A-285 (and digital thermostat) to a 1994 MARINE AIR unit mdl. VHTK16K-H. There are slight color differences in the wiring between a Cruisair and Marine Air. The original unit (which I have removed) was also a Marine Air unit and had a terminal block on the top of the unit. This is where two (2) line feeds came in and terminate. One is the main power feed. I am not sure where the other goes? To the thermostat maybe?? The unit I am installing is a 1994 unit which has no terminal block on top. All of the wiring is in a bundle. The wire colors on the MARINE AIR unit are: GN, BK, WT, W/B, Red, Org, B/R, Y. The wire colors on the CRUISE AIR control box are: GN, BK, R/W, Org, PURPLE and BLUE. There is are separate wires coming from the control box which are BK and Blue. The blue wire is for the high pressure switch and the black went to a ground originally. There is a three color main feed: BK, WT, and Green. There is another BK, WT and Green which should supply power to the raw water pump. Any assistance would be appreciate. I have already discovered that wiring it up the way it came out only triggers the circuit breaker. I only tried that once and hopefully did not damage the motherboard. Thank you, Emory
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Posted on Jan 02, 2017
On AC current it really makes no difference to the operation of the unit which terminal the wires are connected to as long as the circuit is completed. A reason for the inverted wiring is that there will be a resistance between the hot wire and the control circuit. It makes for a reduced load on the contacts and switches minimizing arching.
Posted on Jun 08, 2008
Hopefully there are markings on the old t-stat as to what terminal is what.
on the honeywell 8000 use the heat pump labeling and then the standard wiring would be
There should not be a bare wire, it probably just has the insulation stripped back way too far.
You should probably open the furnace and compare the terminal label in the furnace to the wire color. normally yellow and blue pass through the furnace and are wire nutted to wires going to the outdoor unit. In the furnace the white wire will connect to the w or w1 terminal. also, you will need to set the Honeywell stat to have the following parameters.
other parameters that I did not specify, you may read the manual and make your own decision but I recommend factory settings for the other parameters
Posted on Jun 18, 2008
Posted on Aug 18, 2008
a. Remove the cover of the thermostat.
b. Connect the RED wire from the air conditioner
to the RC terminal on the thermostat.
c. Connect the YELLOW wire from the air conditioner
to the Y terminal on the thermostat.
d. Connect the BLUE wire from the air conditioner
to the H terminal on the thermostat.
e. Connect the ORANGE wire from the air conditioner
to the G terminal on the thermostat.
f. Push the thermostat wires into hole in wall and
fill excess hole with insulation.
g. Mount thermostat base to the wall with screws
h. Check all thermostat wires on base to ensure
they are completely clear of the bimetal coil of
the thermostat. Adjust if necessary.
i. Replace thermostat cover.
If nothing operates on the air conditioner, remove the
return air grille assembly and verify the red, orange, yellow
and blue wires are properly connected (red-to-red,
Next, disconnect the red wires and check for 12 volt
DC between the red wire from roof section and the orange
or blue wire from roof section. If no voltage received,
refer to Section F2. If voltage is received, the
problem lies with the thermostat or thermostat wires.
Next, disconnect all 4 wires (red, orange, yellow and
blue) from the thermostat. With the thermostat set on
COOL mode, FAN mode set on AUTO and HIGH, and
temperature selector set lower than the room temperature. Check for continuity between terminal RC (red wire)
and terminal G (orange wire); and RC (red wire) and
terminal H (blue wire). If continuity is achieved on each,
proceed with the next step.
Set fan switch to LOW. Continuity should NOT be present
between terminal RC and Terminal H, but present between
the other terminals (Y & G) and terminal RC.
If all of the previous checks are good, the thermostat is
good, do not replace it. If any one of the previous checks
are not correct, replace the thermostat.
Posted on Jun 29, 2009
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