D) Condensate
A ¾” mpt fitting is supplied on each side of the unit. Cap the fitting that will not be used.
E) Water Regulation valve (Water Cooled units only)
Water regulation valves are factory adjusted to maintain an approximate head pressure of
260 lbs psig. If adjustment becomes necessary remove the access panel on the condenser
side and adjust accordingly.
F) Humidifier
The evaporative type humidifier pad is factory installed. Connection of water line and
humidifier water valve is made on control panel side of unit. Humidifier should be connected
to 140 degrees F water supply to insure effective operation.
G) Zone Valve (Chilled Water Units)
A 2 or 3 way water valve is provided with the chilled water unit. This valve is factory installed
and is serviceable through access door adjacent to the control panel. The valve control head
is easily removable for replacement. There is also a manual operation capability built into the
valve to provide temporary operation should control head pressure fail.
H) Low Ambient Control (MAA/D Model Optional)
Low ambient controls that can be provided by means of a pressure activated switch mounted
in the compressor section of the unit. This control is factory adjusted but may be field
adjusted if necessary.
I) Motor Speed
All 2 and 3 ton units are shipped with three speed motors. Changing the motor leads in the
evaporator section of the unit may change the motor speed. Access to leads is through the
access door on the control panel side of the unit. Leads will either be color coded of number
coded.
On units with color-coded leads the colors represent the following speeds: On units with
number coded leads the Number represents the following speeds
YELLOW
=
COMMON
=
1
RED
=
LOW SPEED
=
4
BLUE
=
MEDIUM SPEED
=
3
BLACK
=
HIGH SPEED
=
2
To change the speed of the unit first disconnect power to the unit. Disconnect speed now in
used and cap this lead with suitable device. Reconnect lead from fan relay to speed desired.
Note 1: On units that have both humidifier and reheat the auxiliary relay is omitted and a
jumper is installed between terminals (R) and (G).
Note 2: 140 degrees domestic hot water should be supplied to humidifier in order to satisfy
rated capacity.
Note 3: a small plastic orifice installed between the solenoid valve and the evaporator pad
regulates the water flow.
Note 4: the humidistat and dehumidistat can either be wall mounted or unit mounted.
