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Project Name / Date Division 23 52 33.13 - 3
H. Water Heater Diagnostics
1. Provide internal LED displaying the following water heater status/faults:
a. Steady on – Internal control failure
b. One flash – Air flow fault
c. Two flashes – Erroneous flame signal
d. Three flashes – Ignition lockout
I. Combustion Chamber: The lightweight, high temperature, multi-piece, interlocking ceramic fiber
combustion chamber liner shall be sealed to reduce standby radiation losses, reducing jacket
losses and increasing unit efficiency.
J. Venting
1. When routed vertically, the water heater’s flue material and size shall be in accordance with
the National Fuel Gas Code, ANSI Z223.1/NFPA 54 latest edition (Category I).
2. When routed horizontally, the water heater(s) flue material and size shall meet or exceed the
requirements as specified for Category III in the National Fuel Gas Code, ANSI Z223.1/NFPA
54 latest edition.
3. The water heater(s) shall be TruSeal™ direct vent ready. The water heater(s) shall meet
safety standards for direct vent equipment as noted by: the 2006 UMC Section 1107.6;
ASHRAE 15-1994, Section 8.13.6; and ANSI Z21.10.3/CSA 4.3.
K. Cabinet
1. The corrosion-resistant galvanized steel jackets shall be finished with a baked-on epoxy
powder coat which is suitable for outdoor installation, applied prior to assembly for complete
coverage, and shall incorporate louvers in the outer panels to divert air past heated surfaces.
2. The water heater(s), if located on a combustible floor, shall not require a separate combustible
floor base.
3. Combustion air intake shall be on left side of the cabinet.
Specifier Note: The remaining items in this section are options. Delete those that are not being
specified.
L. Water Heater Operating Controls
1. The water heaters(s) shall feature an optional controller.
M. Water Heater Pump - Refer to Equipment Schedule
N. Cold Water Run System
1. The water heater(s) shall be configured with a cold water run automatic proportional bypass
system that ensures the water heater will experience inlet temperatures in excess of 105ºF to
avoid damaging condensation.
2. The cold water run system shall be configured with a variable speed pump that is controlled by
a system-matched PID control that injects the correct amount of cold water directly into the
water heater loop to maintain a minimum inlet temperature. The PID controller temperature
sensor shall be located in the inlet header of the water heater.
3. The control shall have a temperature setting DIP switches located on the face of the board.
The PID Logic shall be capable of limiting system overshoot on initial start-up or call-for-heat.
4. The cold water run system shall be shipped loose for field installation.
2.3 SOURCE QUALITY CONTROL
A. The water heater(s) shall be completely assembled, wired, and fire-tested prior to shipment from
the factory.
B. The water heater(s) shall be furnished with the sales order, ASME Manufacturer’s Data Report,
inspection sheet, wiring diagram, rating plate and Installation and Operating Manual.
PART 3 - EXECUTION
3.1 INSTALLATION
A. Must comply with:
1. Local, state, provincial, and national codes, laws, regulations and ordinances
2. National Fuel Gas Code, ANSI Z223.1/NFPA 54 – latest edition