High Altitude Installation - Rinnai RU98i Installation Manual

High Altitude Installations
The Rinnai RU98i (REU-KB3237FFUD-US), RUC98i (REU-KBD3237FFUD-US), and C199i (REU-KBD3237FFUDC-US) tank-
less water heaters have been certified for use with the Common Vent System (CVent) at installations from
0 - 10,200 feet. (0 - 3,109 m). The Common Vent System is ANSI Z21.10.3 certified; exhaust components to be
propylene (PP/PPTL) for U.S. installations and PPS for Canadian installations (all venting components used in Canada
must be ULC-S636 certified). Intake components to be in accordance with national and/or local codes having
jurisdiction.
For CVent installations at high altitude you must ensure that the water heaters are properly installed and setup for the
altitude that they will be operating at.
stallation and Operation Manual for the RU98i (REU-KB3237FFUD-US), RUC98i (REU-KBD3237FFUD-US), and
C199i (REU-KBD3237FFUDC-US) tankless water heaters.
Water heaters using CVent at altitudes over 2,000ft will automatically de-rate according to the table below. Use the
tables below for calculating your total Btu for multiple water heaters using CVent at elevation:
* RU98i (REU-KB3237FFUD-US), RUC98i (REU-KBD3237FFUD-US), and C199i (REU-KBD3237FFUDC-US)
Altitude: 2,001-10,200 feet
Natural and propane gas
High Altitude De-Rate plus Cvent De-Rate - Natural Gas
Number
of Water
Heaters 2001-5200 Ft 5201 - 7700 Ft 7701 - 10200 Ft
1 170,000
2 336,600
3 499,800
4 659,600
5 816,000
6 969,000
7 1,118,600
8 1,264,800
Water Heater Installation
For information regarding the installation of the RU98i (REU-KB3237FFUD-US), RUC98i (REU-KBD3237FFUD-US), and
C199i (REU-KBD3237FFUDC-US) tankless water heaters, please reference the Installation and Operation Manual
included with the respective tankless water heater.
Set the water heater for "Long Vent" by adjusting the SW1 in DIPSW1 to the OFF Position. (Must be done on all tankless
water heaters when using CVent System)
For information on how to adjust altitude settings reference the respective In-
153,000 139,000
302,940 275,220
449,820 408,660
593,640 539,320
734,400 667,200
872,100 792,300
1,006,740 914,620
1,138,320 1,034,160
High Altitude De-Rate plus Cvent De-Rate - LP Gas
Number
of Water
Heaters 2001-5200 Ft 5201 - 7700 Ft 7701 - 10200 Ft
1 168,000
2 332,640
3 493,920
4 651,840
5 806,400
6 957,600
7 1,105,440
8 1,249,920
4
151,000 120,000
298,980 237,600
443,940 352,800
585,880 465,600
724,800 576,000
860,700 684,000
993,580 789,600
1,123,440 892,800
Rinnai CVent