winholt NHPL-1833-ECOC-2D-DGT Reference manual

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NHPL-1836C-DGT
Operational Maintenance
& Service Bulletin for Models:
NHPL-1825-UNC
NHPL-1833-ECOC-2D-DGT
NHPL-1836-ECOC
Non-Insulated Economy
NHPL-1836C-DGT
NHPL-1836C
Non-Insulated Standard
NHPL-1825-UNC-DGT
NHPL-1825-UNC
Non-Insulated Universal Runner
NHPL-1810/HHC
Non-Insulated Undercounter 1/2 size
INHPL-1836C-DGT
INHPL-1836C
Insulated
100% Pre-Tested Electrical Assembly

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General Information
Models:
NHPL-1833-ECOC-2D-DGT
NHPL-1836-ECOC
NHPL-1836C-DGT
NHPL-1836C
NHPL-1825-UNC-DGT
NHPL-1825-UNC
NHPL-1810/HHC
INHPL-1836C-DGT
INHPL-1836C
TABLE OF CONTENTS
General Information........................................................................................................ 1
Unpacking and Installing ............................................................................................... 1
Maintenance and Caution .............................................................................................. 1
Power Supply .................................................................................................................. 1
Operating Instructions Digital Drawer .......................................................................... 2
Alarms and Conditions................................................................................................... 6
Operating Instructions Analog Controls ...................................................................... 8
Service Specifications.................................................................................................... 8
Recommended Temperature Guidelines-Food holding Chart ................................... 9
Drawer Assembly and Parts ........................................................................................ 10
Electric Schematic Power Supply NHP-PD-DGT Digital ........................................... 11
Electric Schematic Power Supply NHP-PD-ECO Analog.......................................... 12
Universal Runner Assembly Instructions................................................................... 13
Statement of Warranty & Troubleshooting ................................................................ 14

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General Information
Our Heater Proofer Series cabinet will hold food hot at a constant temperature and supply
humidity for proofing when the application applies. This cabinet is NOT a cooking appliance.
UNPACKING
Examine the interior of the unit to make sure all packing materials are removed before the
unit is plugged into an electrical outlet. Examine the interior and exterior to determine whether
any damage was incurred during delivery. If so, notify the carrier immediately to file a damage
claim. All WinHolt equipment is carefully tested and inspected prior to shipment. When
accepted for delivery by carrier, the responsibility for safe arrival at the destination is assumed
by the carrier. For the NHPL-1825-UNC, and NHPL-1825-UNC-DGT universal runners are
boxed separately and found inside the cabinet.
CAUTION
Should any damage be found, do not attempt to operate the unit. Call your dealer
IMMEDIATELY to arrange for service.
INSTALLATION
Position your unit on a stable level surface and plug in the supplied cord into any grounded
120-volt AC, 15 amps power supply dedicated breaker. It does not require a dedicated circuit
but is designed for use with the power cord supplied with the unit. It is highly recommended that
you use ONLY the power cord supplied. Use of a dedicated circuit should insure operational
efficiency. Do not operate the unit with an extension cord.
MAINTENANCE
The equipment has been designed to require minimum maintenance and has been constructed
to meet NSF and U.S. Public Health Service standards.
Non-toxic chemical cleaners or mild detergents are recommended for cleaning of fixtures.
DO NOT use steel wools of any kind. Steel wool particles will work into the grains of the
metal causing corrosion. Also, these particles can cause a health hazard. Should scouring be
required, use a non-abrasive type of cleaner. Do not use caustic solutions on your equipment.
Hosing or steam cleaning should not be necessary to keep these fixtures clean and sanitary.
Do not allow water or steam to come into contact with electrical components. Never power
wash or steam clean the cabinet with the power drawer inserted.
POWER SUPPLY ( NHP-PD-ECO Analog Drawer or NHP-PD-DGT Digital Drawer )
The the units do not require a dedicated circuit but is designed for use with the power cord
which is supplied. It is highly recommended that you use ONLY the power cord supplied. Use
of a dedicated circuit should insure operational efficiency. Do not operate the unit with an
extension cord.
CAUTION
Be sure to disconnect power source before cleaning and servicing the unit. Liability for improper
or careless use is the responsibility of the equipment owner or persons servicing the unit,
including the authorized service agent.

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Operating Instructions For Digital Drawer DGT Series
TURNING ON THE UNIT
When the unit is first plugged in, the control:
• Emits one short beep
• Executes a lamp test for 5 seconds
• Turns “OFF” all indicators
• Turns unit to the “OFF” mode. In this mode the control remains powered as long as the
unit is plugged in, it is not truly off, but the blower and all heaters are off.
TURNING ON THE CONTROL
The Control is turned “ON” by pressing and holding the POWER button for at least 2 seconds.
A beep will occur when first pressed and “Hld“ and “Hld“ will be displayed on the 3-digit
displays indicating “HOLD”. The same process is used to return the Control to “OFF” mode
from “IDLE”, “HEAT”, or “PROOF” mode.
When the Control is first turned “ON”, it enters “IDLE” mode with the “POWER LED” on and the
“HEAT” and all “PROOF LED” off.
The 3-digit displays will show “---“ and “---“ indicating the Control is “ON”, but not yet controlling
Heat or Humidity [Temperature].
MODE SELECTION
“HEAT” Mode
To select “HEAT” mode, press the “HEAT” button while in “IDLE” or “PROOF” mode.
The “HEAT LED” will turn on, the Heat Mode Box Temperature Setpoint will be displayed
(blinking), and the unit will control Box Temperature based on the displayed setpoint. After 10
seconds, the display will change to show the Actual Box Temperature.
To return to “IDLE”, press the “HEAT” button again; the “HEAT LED” will turn “OFF” and Box
Temperature Control will cease. The Heat Mode Box Temperature Setpoint is stored and will
be used the next time “HEAT” mode is entered
“PROOF” Mode
To select “PROOF” mode, press the “PROOF” button while in “IDLE” or “HEAT” mode.
The “PROOF LED” will turn on, the Proof Mode Box Temperature and Humidity [Temperature]
Setpoints will be displayed (blinking), and the unit will control Box Temperature and Humidity
(Water Pan Temperature) based on the displayed setpoints.
Even though the Humidity Setpoint is managed as an “N” index, actual temperature is
displayed in °F or °C, as configured.
To return to “IDLE”, press the “PROOF” button again; the “PROOF LED” will turn off and Box
Temperature and Humidity [Temperature] Control will cease. Proof Mode Box Temperature and
Humidity Setpoints are stored and will be used the next time “PROOF” mode is entered.
NOTE: Box Temperature Setpoint limits are the same in “PROOF” mode as in “HEAT” mode. The
user could set a high box temp even though the humidity setpoint is low.
See page 8 for Analog Drawer Operation

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CONTROLS
TURNING “OFF” THE CONTROL
To turn “OFF” the Control, press and hold the “POWER” button, the Control stores the (“IDLE”,
“HEAT”, or “PROOF”) Operating Mode.
When the Control is turned back “ON”, it automatically enters its previous mode. Along with
separately stored “HEAT” and “PROOF” mode Box Temperature Setpoints.
This feature streamlines transitions between “HEAT”, “PROOF”, “IDLE”, and “OFF” modes.
BOX (CABINET) TEMPERATURE
Box (Cabinet) Temperature is indicated on the left-hand 3-digit display when in “HEAT” or
“PROOF” mode.
The display can be configured for °F, °C, or “N” index-based format. If in “N” format, the
“SETPOINT” is displayed as a numeric value from 1 through 9 and the actual temperature is
displayed in °F, otherwise, both setpoint and actual temperature are displayed in the selected
format.
Box Temperature Setpoint (see Table 2 for “N” index-based setpoints):
Table 1
°F °C “N”
Minimum 80 26 1 (80 °F)
Maximum 190 88 9 (190 °F)
Resolution 5 2 1 (13.75 °F)
Table 2
“N” Indexed Format Box Temperature Setpoint Table
“N” °F °C
1.0 80.00 26.67
2.0 93.75 34.31
3.0 107.50 41.94
4.0 121.25 49.58
5.0 135.00 57.22
6.0 148.75 64.86
7.0 162.50 72.50
8.0 176.25 80.14
9.0 190.00 87.78
°/”N” 13.75 7.64
Operating Instructions (continued)

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Operating Instructions (continued)
BOX TEMPERATURE HEATER CONTROL
Table 1
Behavior / Selected Units °F °C “N” Index
Heater(s) turn off (temperature increasing) Setpoint + 2 Setpoint + 1 Setpoint + 2 °F
Heater(s) turn on (temperature decreasing) Setpoint – 2 Setpoint – 1 Setpoint – 2 °F
The Control implements a three-stage power algorithm during Box Temperature Control to
minimize power consumption, improve temperature consistency, and minimize relay cycles.
There are two Heaters available to heat the box: 900 W and 600 W.
There are three stages of heat that can be used:
Stage 1 = 600 W
Stage 2 = 900 W
Stage 3 = 900 W + 600 W = 1500 W.
When initially entering “HEAT” mode or if the user increases the “SETPOINT” while in
“HEAT” mode, the Control uses Stage 3 to reach its setpoint as quickly as possible.
If, during any heating cycle, the setpoint is reached before 4 minutes elapse, the next
heating cycle begins with the next lower stage.
If, during any heating cycle, the setpoint is not reached before 8 minutes elapse, the
control immediately uses the next higher stage and the next heating cycle will begin
with that higher stage.
Humidity [Temperature]
Humidity [Temperature] is indicated on the right-hand 3-digit display, only in “PROOF”
mode.
Throughout this document, humidity refers to the Water Pan Temperature, since humidity is not
directly sensed.
In “HEAT” mode, “---“ is displayed. The Humidity Setpoint ranges from 1.0 through 9.0 with a
resolution of 0.5. See Table 2.

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Operating Instructions (continued)
Table 2
Humidity [temperature] Setpoint Table (“N” Indexed Only)
"N" °F °C
1.0 100.00 37.78
1.5 103.13 39.51
2.0 106.25 41.25
2.5 109.38 42.99
3.0 112.50 44.72
3.5 115.63 46.46
4.0 118.75 48.19
4.5 121.88 49.93
5.0 125.00 51.67
5.5 128.13 53.40
6.0 131.25 55.14
6.5 134.38 56.88
7.0 137.50 58.61
7.5 140.63 60.35
8.0 143.75 62.08
8.5 146.88 63.82
9.0 150.00 65.56
°/"N" 6.25 3.47
HUMIDITY [TEMPERATURE] HEATER CONTROL
Table 1
Behavior / Selected Units “N” Index
Heater turns off (temperature increasing) Setpoint + 2 °F
Heater turns on (temperature decreasing) Setpoint
When Setpoints are displayed, they are always flashing.
When Actual Temperatures are displayed, they are always steady.
To view/set a Temperature or Humidity “SETPOINT”, press the “UP” or “DOWN” button
beneath the respective Temperature or Humidity Display.
The “SETPOINT” will flash and may be adjusted up or down to its limits using the “UP” or
“DOWN” buttons.
When being adjusted, Setpoint(s) will remain flashing for 5 seconds while adjusting. After
adjusting a steady display will show actual conditions.
Note: Humidity Setpoint may be set only in “PROOF” mode, not in “HEAT” mode.

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Operating Instructions (continued)
READY INDICATORS FOR HEAT AND HUMIDITY
The Control provides two “READY” indicators for Heat and Humidity.
“READY” indicators are controlled separately and the Humidity Ready indicator will remain off
in “HEAT” mode.
The Heat Ready / Proof Ready function operates as follows:
Behavior / Selected Units °F °C “N” Index
LED turns on (temperature increasing) Setpoint Setpoint Setpoint
LED turns off (temperature decreasing) Setpoint – 10 °F Setpoint – 6 °C Setpoint – 10 °F
Alarms and Conditions
AUDIBLE INDICATORS
The Control provides audible indicators as follows:
One short beep: When power is first applied.
One short beep: When the “POWER” button is pressed while in “OFF” mode.
Three short beeps: Box Temperature or Humidity [Temperature] becomes “READY” and
the “READY LED” turns “ON”.
One long beep: Box Temperature or Humidity [Temperature] transitions from “READY” to
“NOT READY” and the “READY LED” turns “OFF”.
When an alarm condition is detected, as described below:
• The Control has a “LOW WATER” indicator which is not included. There is neither
a sensor nor a detection technique implemented in its firmware. This red LED is
illuminated during the Lamp Test Function only.
• The Circulating Blower is turned “ON” when the Control transitions from “OFF” to “IDLE”,
“HEAT”, or “PROOF” mode and remains “ON” until the Control returns to “OFF”. The
Blower remains “ON” in “IDLE” mode even though no heaters are on in that mode.
• The Control defaults to display in °F, but the display format is easily changed.
Turn the unit “OFF” by holding the “POWER” button, then hold both “POWER” and Box
Temperature “DOWN” buttons until “Hld” turns off. At that point the currently selected
display format will appear on the Temperature Display as “F”, “C”, or “n”.
Use the temperature “UP” or “DOWN” buttons to scroll through the format options to
change the format. When the desired format is displayed, stop pressing buttons and wait
10 seconds for the Control to return to the mode prior to being turned off. The selected
format will be remembered even if power is removed.
• Firmware Version 0.4 adds the option to view the Control’s Firmware Version on the
3-digit displays.
Turn the unit “OFF” by holding the “POWER” button, then hold both “POWER” and

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Alarms and Conditions (continued)
Humidity Temperature “DOWN” buttons until “Hld” turns off.
The Firmware Major Version will be displayed on the Heat Temperature Numeric
Display, along with a trailing decimal point.
The Firmware Minor Version will be displayed on the Humidity Temperature Numeric
Display.
After 10 seconds the control will return to the mode prior to being turned off.
• If an Alarm Condition is detected, the beeper sounds for 0.5 second and then is off for 1
second. This repeats until acknowledged (silenced).
To acknowledge (silence) the alarm, a short press of the “POWER” button is all that is
required.
The Alarm Condition may persist, but the beeper will remain silenced until another
alarm condition occurs.
• In addition to the audible alarm, the two 3-digit displays provide information about the
cause of the alarm as shown in the following table. If an Alarm Condition is detected
but goes away before being acknowledged, its indication will continue until being
acknowledged.
Fault Detected Detection Method Indication Effect on Operation
Pushbutton stuck Pushbutton actuated
longer than 30
seconds
“Err” “Pbn” pushbutton
“n” stuck where “n” is
1 = power; 2 = heat;
3 = proof; 4 = heat up;
5 = heat down;
6 = [proof] humidity up;
7 = [proof] humidity down
None – stuck
pushbutton is ignored
Box temperature
Thermistor shorted
Thermistor resistance
out of range too low
“Err” “5l5” sensor 1
short
Box Heater(s) are
turned off
Box temperature
Thermistor open
Thermistor resistance
out of range too high
“Err” “5lO” sensor 1
open
Box Heater(s) are
turned off
Water temperature
Thermistor shorted
Thermistor resistance
out of range too low
“Err” “525” sensor 2
short
Water Heater is turned
off
Water temperature
Thermistor open
Thermistor resistance
out of range too high
“Err” “52O” sensor 2
open
Water Heater is turned
off
No AC Line Interrupt 60 Hz (16.67 ms
interval) interrupt has
not occurred within
50 ms
“Err” “AC ” AC interrupt Timed relay operations
are suspended; relay
operations lose AC
line synchronization

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The Heater-Proofer is an aluminum transport cabinet with heaters to function as a hot food holding cabinet,
and/or as a proofing cabinet.
The heater, or heat drawer, is slid into place on the lower ledges of the cabinet. An electrical power cord is
provided and plugged into the drawer through an access hole in the back of the cabinet.
The main power switch on the front of the drawer, when switched “ON”, will turn on the light in the switch
and turn on the air circulating fan in the drawer. The circulating fan and 900w heater element will operate
continuously while the unit is “ON”.
Analog Drawer: The thermostat control knobs are mounted to the left and right of the HEAT/ PROOF switch.
The left thermostat knob controls the heat in the cabinet from 1 (low heat; approx. 80 °F) to 9 (high heat;
approx. 185 °F). The right thermostat knob controls the humidity from 1 (approx. 20% relative humidity) to 9
(100% relative humidity). Average setting will be approx. 6 (approx. 85% relative humidity).
Digital Drawer:The thermostat control buttons are located under each digital display “Heat Temperature”
or “Proof Temperature”. The heat controls in the cabinet range from low heat approx. 80 °F to high heat,
approximately 185 °F. The humidity controls in the cabinet range from approximately 20% to 100% relative
humidity. The average will be approximately 85% relative humidity.
Service Specifications
Heater Proofer Series
Operating Instructions For Analog Drawer Series C Series
1. Push main power switch (ON/ OFF rocker) to “ON” position.
2. Push HEAT/ PROOF switch to HEAT for heating ONLY.
3. Turn HEAT thermostat knob fully clockwise for preheat.
4. Allow 45 minutes for pre-heating, then turn thermostat to desired setting.
5. Place water in the “water pan” filling to about 3/4 full, for proofing
6. For proofing, push HEAT/ PROOF switch to PROOF.
7. Adjust the heat and humidity thermostat knob to control desired temperature and
humidity. Allow 45 minutes for pre-heating.
NOTE: The internal air circulation blower and 900w heater element (controlled with the “Heat”
Thermostat) will operate continuously when the power switch is turned “ON”.
HEAT THERMOSTAT
The controlling range is 80°F to 185°F. The dial has numbers 1 thru 9 that do not relate to a specific
calibrated temperature. Temperature settings must be obtained through familiarization with the unit. The dial
also has an “OFF” position to turn heater unit off.
HUMIDITY THERMOSTAT
To control humidity range from 30% to 100%, humidity settings must be obtained through familiarization with
the unit. The dial has numbers 1 thru 9 that do not relate to a specific calibrated humidity. The dial also has
an “OFF” position to turn humidity off.
To maintain low heat range between 85°F and 100°F, switch to proof mode and adjust heat knob to
desired heat range. Allow 45 minutes to pre-heat in proof cycle.