Instruction Manual
62
penetrate the roof external to the unit itself.
The drain line should be pitched away from
the unit at least 1/8 inch per foot. On longer
runs an air break should be used to ensure
proper drainage.
Draw-through cooling coils will have a
negative static pressure in the drain pan area.
This will cause an un-trapped drain to back
up due to air being pulled up through the
condensate drain piping.
Condensate drain trapping and piping should
conform to all applicable governing codes.
Heating Coils
One or two row hot water and steam heating
and preheating coils can be factory installed.
All valve controls for heating operation are
field supplied and field installed. Hot water
and steam coil connections are spun copper
tube.
Water coils should not be subjected to
entering air temperatures below 38°F to
prevent coil freeze-up. If air temperature
across the coil is going to be below this
value, use a glycol solution to match the
coldest air expected.
Table 20 - Steam Coil Connection Sizes
Model (RN-)
Steam Coil
Connection Size
006-140
2 1/8”
Table 21 - Hot Water Coil Connection Sizes
Model (RN-)
Hot Water Coil
Connection Size
006, 007, 008, 009, 010,
011, 013, 015
1 3/8”
016, 018, 020, 025, 030
1 5/8”
026, 031, 040, 050, 060,
070
2 1/8”
(standard)/
1 3/8” (preheat
coil)
055, 065, 075, 090, 105,
120, 130, 140
2 1/8”
Chilled Water Coil
Four or six row chilled water cooling coils
can be factory installed. All valve controls
for cooling operation are field supplied and
field installed. Chilled water coil
connections are spun copper tube.
Table 22 - Chilled Water Coil Connection
Sizes
Model (RN-)
Chilled Water
Coil Connection
Size
006, 007, 008, 009, 010,
011, 013, 015
1 5/8”
016, 018, 020, 025, 030
2 1/8”
026, 031, 040
2 5/8”
050, 055, 060, 065, 070,
075, 090, 105, 120, 130,
140
2 1/8”
Unit should not be operated without a
p-trap. Failure to install a p-trap may
result in overflow of condensate
water into the unit.
CAUTION
Piping shall be in accordance with
national and local codes. Pressure
limiting devices, backflow preventers
and all other safety requirements are
the sole responsibility of the installing
contractor.
WARNING