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
