Gas Pressures
Supply (while not running)
Natural Gas (NG)
(min/max) is 4.5/14.0
Liquid Petroleum (LP)
(minimum/maximum) is 11.0/14.0
Supply (while running)
Natural Gas (NG)
The minimum gas supply pressure to the unit should be 4.5" w.c. while unit is running.
The maximum supply pressure to the unit must not exceed 14" w.c. at anytime.
Liquid Petroleum (LP)
The minimum gas supply pressure to the unit should be 10" w.c. while unit is running.
The maximum supply pressure to the unit must not exceed 14" w.c. at anytime.
Manifold (while running)
Natural Gas (NG)
The manifold pressure (after the gas valve) for the single stage heaters should be set to 3.3 w.c. while unit is running.
The manifold pressure (after the gas valve) for the 2 stage NG heaters should be set to 3.5" w.c. on high fire while unit is running.
The low fire manifold for NG heaters is set to 1.8" w.c. It is not field adjustable.
Liquid Petroleum (LP)
The manifold pressure (after the gas valve) for the single stage heaters should be set to 10 w.c. while unit is running.
2 stage high setting is 10" w.c.
Low setting is 4.6" w.c. (non adjustable).
WARNING:
Information in this article is intended for use by individuals possessing adequate backgrounds of electrical and mechanical experience and who comply with all federal, state, and local laws, rules, orders, or regulations related to the installation, service, or repair of a heating or central air conditioning product. Any attempt to install, service, or repair a heating or central air conditioning product may result in personal injury and/or property damage. The manufacturer or seller cannot be responsible for the interpretation of the information contained herein, nor can it assume any liability in connection with its use.