Literature Change History
May 2007
Update of IOM unit service clearances. Length of front and back clearances from 60” to 48” and
length of left and right side clearances from 100” each to interchangeable 48” and 70”. (Note:
Units with hydronic heat must have 70” right side access for service.) Gas piping sizes table on
page 10 was updated with new gas heater information.
November 2007
Update of the IOM Gas Piping Connection Sizes table. Connection sizes of Model Option B2 = A
and B were changed to ¾” and the connection size of Model Option B2 = C, D, and E was changed
to 1 ½”.
September 2008
Update of the IOM adding information about 16-25 and 30 ton RN Series units.
May 2009
Update of the IOM adding information about 9-15 ton RN Series units. The part number for the
IOM was changed from R15710 to R79510.
June 2009
Update of the IOM making corrections to some of the values in the tables of Appendix A and
adding e-coated coil cleaning instructions.
August 2009
Update of the IOM correcting the Gas Heater Operation section to have the same sequence of
operation for both natural gas and propane gas heaters.
September 2009
Update of the IOM adding Refrigerant-to-Water heat exchanger and Thermostat Control Wiring
information and correcting Table I7 Natural Gas Maximum Piping Capacities.
April 2010
Update of the IOM adding information about 6-10 ton RN Series units. The part number for the
IOM was changed from R79510 to R90720.
October 2010
Update of the IOM to include 100% Return Air option in Feature 1, and Single Zone VAV
controllers in feature 13. Feature 15 was changed from an empty feature to include Glycol
percentage options.
February 2011
Added information regarding the charging of a heat pump and added additional information
regarding freezing water in the heat exchanger.
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