AWUF Installation Manual

3
Units are equipped with both a bottom primary and second-
ary drain. Both drains must be trapped, unless emergency
condensate switch is install in the secondary drain. Fail-
ure to install a trap could result in condensation overflow-
ing the drain pan resulting in substantial water damage to
the nearby area.
The connectors required are 3/4" NPT male, either PVC or
metal pipe, CPVC piping is not approved, and should be
hand tightened to a torque of no more than 37 in-lbs. to
prevent damage to the drain pan connection.
To prevent potential sweating and dripping on to finished
space, it may be necessary to insulate the condensate drain
line located inside the building. Use Armaflex
®
or similar
material.
NOTE: If you intend to install this unit with a “WAD”
door it must be mounted 1/4” behind front edge of
stud.
Electrical Supply Wire and MOP
HIGH VOLTAGE
To avoid the risk of fire or equipment
damage, use only copper conductors.
Disconnect ALL power before servicing or
installing this unit. Multiple power sources may
be present. The electrical power to this unit MUST be in
the OFF position and all power supplies disconnected.
Failure to do so may cause property damage, personal
injury or death.
The unit MUST have an uninterrupted, unbroken
electrical ground to minimize the possibility of personal
injury if an electrical fault should occur. The electrical
ground circuit may consist of an appropriately sized
electrical wire connecting the ground lug in the unit and
control box wire to the building’s electrical service
panel. Other methods of grounding are permitted if
performed in accordance with the “National Electric
Code” (NEC)/”American National Standards Institute”
(ANSI)/”National Fire Protection Association” (NFPA) 70
and local/state codes.
In Canada, electrical grounding is to be in accordance
with the Canadian Electric Code CSA C22.1. Failure
to observe this warning can result in electrical shock
that can cause personal injury or death.
INSPECTION OF THE BUILDING ELECTRICAL SERVICE
This unit is designed for single-phase electrical supply.
DO NOT OPERATE ON A THREE-PHASE POWER SUPPLY.
Measure the power supply to the unit. The supply volt-
age must be in agreement with the unit nameplate power
requirements and within the range shown in Table 1.
Nominal Input Minimum Voltage Maximum Voltage
208/230 187 253
Table 1
Wire Sizing
Wire size is important to the operation of your equipment.
Use the following check list when selecting the appropriate
wire size for your unit.
• Wire size must carry the Minimum Circuit Ampacity
(MCA).
• Wire size allows for no more than a 2% voltage
drop from the building breaker/fuse panel to the
unit.
Refer to the latest edition of the National Electric Code
or in Canada the Canadian Electric Code when determin-
ing the correct wire size. Table 2 shows the current
carrying capabilities for copper conductors rated at 75
o
C
with a 2% voltage drop. Use Table 2 to determine the
voltage drop per foot of various conductors.
10 15 20 25 30 35 40 45
14 75 50 37 NR NR NR NR NR
12 11879 59 47 NRNRNRNR
10 188 125 95 75 63 54 NR NR
8 301 201 150 120 100 86 75 68
6 471 314 235 188 157 134 118 110
*Based on NEC 1996
Table 2
Maximum Allowable Length in Feet
to Limit Voltage Drop to 2%*
Minimum Circuit Ampacity (MCA)
Wire Size
(AWG)
Maximum Overcurrent Protection (MOP)
Every installation must include an NEC (USA) or CEC
(Canada) approved overcurrent protection device. Also,
check with local or state codes for any special regional
requirements.
Protection can be in the form of fusing or HACR style
circuit breakers. The Series and Rating Plate can be used
as a guide for selecting the MAXIMUM overcurrent de-
vice.
NOTE: Fuses or circuit breakers are to be sized larger
than the equipment MCA but not to exceed the MOP.
IMPORTANT NOTE: Torch heat required to braze tubes of
various sizes is proportional to the size of the tube. Tubes
of smaller size require less heat to bring the tube to
brazing temperature before adding brazing alloy. Applying
too much heat to any tube can melt the tube. Service
personnel must use the appropriate heat level for the size
of the tube being brazed.