30
ComPac 9/04-12
•
Automatic system switch, No fan signal.
•
Automatic switch-over between heating and cooling.
•
Digital display in °F or °C.
•
Setpoints are permanently held in memory - no batteries required.
Timing Device
•
Solid state timer with both 3.5 and 7 day changeover capability.
NOTE: Cut timer circuit wire to provide 3.5 day changeover. Timing accuracy ±5%.
•
Momentary push button for accelerated manual timer advance. (9 seconds = 7 days)
•
Light emitting diode indicates power on and identifies the lead unit.
•
Timing logic retention for up to one hour on power loss.
Low Voltage Wiring
1. On single units, pull the low voltage wiring (e.g., 18 gauge 4-conductor Class 2
thermostat wire) from the ComPac
®
A/C into the thermostat / subbase assembly.
2. Mount the subbase on a level plane. Use a spirit level. Connect the thermostat wire to
the ComPac
®
unit terminal block and the thermostat as shown in Figure 8a.
3. On dual units, refer to the Marvair
®
LL357D2 Lead/Lag Controller Specification
Sheet. Level and install the LL357D2 subbase. Wire the two ComPac
®
units to the
Lead/Lag Controller, according to the wiring diagram on the specification sheet and as
shown in Figure 8b (note: the diagram also appears on the back cover of the LL357D2).
Remote Signalling: Terminals 5 & 7 on the ComPac
®
A/C terminal board are dry contacts
which can be used for remote signalling in the event of a/c cutoff on low or high pressure limit.
Continuous fan operation: For continuous indoor fan operation on single units, install a
jumper between terminals 8 and 3. For continuous indoor fan operation on dual units using
the LL357D2, install jumper between 8 and 3 and remove jumper between 1 and 3.
208/230v Power Supply: For units designed for operation on 208/230v, 60Hz power
supply, the transformer is factory wired for a 230v power supply. For a 208v power supply,
remove the orange lead from the transformer and connect the red lead. Insulate the orange
lead.
Unit Shutdown/Fire Alarm Systems
Immediate shutdown of the air conditioning system can be accomplished by wiring the
normally closed set of contacts in the fire extinguishing or alarm system across terminals 8 and
10 on the low voltage terminal board inside the air conditioner. Note: The factory jumper
between these terminals must be removed.
This function cannot be accomplished at the wall thermostat because the blower timed delay
relay connections inside the unit allow the indoor blower to operate for 90 seconds following
each cool "on" cycle.
NOTE: The Blower Timed Delay Relay (BTR) allows the indoor fan to run for approximately
90 seconds after the compressor is off. This operation provides a small improvement in system
S.E.E.R.
