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Project Name / Date Division 23 52 33.13 - 3
2. The water heater(s) shall be equipped with a fixed 5-minute energy-saving pump control relay,
mounted and wired, which automatically shuts off the water heater pump at a set period after
water heater shut-down to avoid standby losses associated with constant pump operation.
G. Firing Mode
1. For model 399B, provide on/off control of the gas input to the water heater (stage fire
optional).
2. For models 499B-899B, provide two-stage firing control of the gas input to the water heater.
H. Water Heater Diagnostics
1. Provide external LED panel displaying the following water heater status/faults:
a. Power on – Green
b. Call for heat – Amber
c. Burner on – Blue
d. Safety fault – Red
2. A Central Point Wiring board with diagnostic LED’s indicating the status of each relay.
3. Provide ignition module indicating the following flash codes by LED signal:
a. 1 flash – low air pressure
b. 2 flashes – flame in the combustion chamber w/o CFH
c. 3 flashes – ignition lock-out (flame failure)
d. 4 flashes – low hot surface igniter current
e. 5 flashes – low 24VAC
f. 6 flashes – internal fault
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 ducted combustion air ready.
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. The water heater(s) shall have the option of venting the flue products either through the top or
the back of the unit.
4. Combustion air intake shall be on the left side of the cabinet, right side optional.
L. Water Heater Operating Controls
1. The water heaters(s) shall feature an optional two-stage digital controller, mounted and wired.
2. Water temperature sensors shall be shipped loose for field installation by installing contractor.
Specifier Note: The remaining items in this section are options. Delete those that are not being
specified. IMPORTANT: The Cold Water Start and Cold Water Run Systems cannot be
used on the same water heater.
M. Water Heater Pump - Refer to Equipment Schedule
N. SureRack™ Water Heater Stacking Kit
1. The water heaters shall be stacked directly one on top of the other, without offset, to minimize
footprint.
O. Cold Water Start System
1. The water heater(s) shall be configured with a cold water start automatic proportional bypass
system that ensures the water heater will experience inlet temperatures in excess of 105ºF in