Filter
Top Products
10-10
Page 18
2008-10-01
G. DRAIN LINE
(1) NH Series Outdoor units require and external drain line to provide for draining from
the unit.
(2) ALL OUTDOOR PIPING SHOULD BE PROPERLY INSULATED AND HEAT
TRACED TO PREVENT FREEZING.
(3) Route the drain hose to a drain funnel inside the building to provide an air gap
before entering the main building drain/sewage system.
(4) Some units have a drain pump. Refer to the NH Indoor Installation Guide for flow
rates and pressures.
(5) Drain line should be capable of withstanding 200°F (93°C) temperatures.
(6) Internal drain water tempering will ensure a maximum of 140°F (60°C) during
normal operation.
(7) Optional low temperature drain water cooler is available to cool drain water to
120°F (49°C).
H. AUXILIARY DRAINS
(1) Auxiliary draining is part of the freeze protection system that is discussed in section
2C of this chapter.
(2) A second hose, 5/8” in diameter, extends from the bottom of the unit. This is the
auxiliary drain hose.
(3) This hose must be drained into an open funnel. It can share a funnel with the
primary drain line if necessary.
(4) ENSURE ALL AUXILIARY DRAIN HOSE IS PROPERLY HEAT TRACED AND
INSULATED TO PROTECT FROM FREEZING.
(5) Auxiliary drain water temperature will be 50°F (10°C)
(6)
Additionally, the NHSC has an additional port to allow for guide draining of the
scale tank. It is recommended that this drain port be plumbed to a funnel in the
same manner as the other drains. This drain can share a funnel with the other
primary and auxiliary drains if desired.
I. STEAM LINES
(1) The steam outlet connection is located at the back of the NH Outdoor unit. Steam
hose(s) and clamps are supplied with the unit and are intended to provide a flexible
coupling outside of the unit to the building steam lines.
(2) NH Outdoor models can develop steam pressures up to 12” w.c. to overcome duct
and steam line pressures. Duct and line pressures about 12” w.c. will cause steam
to exit through the drain line.
(3) Steam lines can be routed to an air handler on a roof or pipe chased (external to
the unit) through an exterior wall or roof to enter the building.
(4) All steam lines must be insulated to reduce losses.
(5)
For steam line installation guidelines, consult the distribution system installation