The paperwork for the electrified lock on your door reads 45HW7DEU15R626RQE or 9KW37DEL15KS3626RQE, and the replacement has to match the function, the voltage and the switches of the system it is wired into. Read against BEST's charts, the number spells out the function and the switch options.
Where BEST explains the W numbers
BEST breaks these numbers down in the How To Order charts of its W and M Series catalog (BA-0002, 10-25): pages 7 to 9 for the 40HW mortise locks, that is the 45HW and 47HW, and page 10 for the 8KW and 9KW cylindrical locks. Lever, rose and backset codes repeat those of the mechanical locks in our BEST 9K and 45H guide; the function, voltage and switch options are new.
DEU and DEL: fail secure and fail safe in BEST's words
The specification pages pair the letters with the terms: "All EU functions: Electrically Unlocked (Fail Secure)" and "All EL functions: Electrically Locked (Fail Safe)". In the 40HW function table, the outside lever or knob of a DEL lock is locked by "Applying power to solenoid; remains locked while power is on" and unlocked by "Removing power from the solenoid". A DEU lock is the reverse: removing power locks the outside lever, applying power unlocks it.
Fail safe and fail secure in general are covered in our electrified door hardware guide.
45HW and 47HW function codes
The full 40HW function list:
| Code | BEST's description |
|---|---|
| DEL | Single key latch, fail safe |
| DEU | Single key latch, fail secure |
| WEL | Double key latch, fail safe |
| WEU | Double key latch, fail secure |
| TDEL | Single key deadbolt, fail safe |
| TDEU | Single key deadbolt, fail secure |
| TWEL | Double key deadbolt, fail safe |
| TWEU | Double key deadbolt, fail secure |
| NXEL | Keyless, latch, fail safe (45HW only) |
| NXEU | Keyless, latch, fail secure (45HW only) |
| LEL | Keyless, deadbolt, fail safe (45HW only) |
| LEU | Keyless, deadbolt, fail secure (45HW only) |
What operates the latch, the deadbolt and each lever is set out for every code in the function tables on pages 8 and 9.
How to read a BEST 45HW number
The 40HW chart runs: series, core housing, function, lever style, trim style, finish, hand and options. Take 45HW7DEU15R626RQE:
| Code | Meaning |
|---|---|
| 45HW | Electrified mortise lock, lever |
| 7 | 7-pin housing, accepts all BEST cores |
| DEU | Single key latch, fail secure |
| 15 | Contour angle return lever |
| R | 2-3/4 inch concave rose |
| 626 | Satin chromium plated |
| RQE | Request to exit switch |
45HW7DEU3H626 has the same function with the 3 lever (solid tube with return), the flat 2-3/4 inch H rose and no RQE. The 47HW is the high security version, and its 7-pin housing accepts 5C cores only. A hand, when given, follows the finish: RH, RHRB, LH or LHRB, where the 40H service manual reads RB as reverse bevel (see our door handing chart).
12V, 24V and the solenoid
On both W charts the 12V option reads "Specify 12 Volt System (standard lock voltage is 24V)". Still, numbers can carry 24V: the 40H Series Service Manual lists 24V, a 24 volt solenoid, among the options for electrified case only locks (45HWCA). Its parts lists carry a 12 V solenoid (B44613) and a 24 V solenoid (B44610), and a complete 45HW case has a different part number for each solenoid and sensor mix.
How to read a BEST 9KW or 8KW number
On page 10 the backset sits in the series (9KW3 is 2-3/4 inch), and a strike package follows the trim. The 9KW takes levers 14, 15 or 16, the 8KW only knobs, 4 (round) or 6 (tulip). Both come as DEU or DEL only. Here is 9KW37DEL15KS3626RQE:
| Code | Meaning |
|---|---|
| 9KW3 | 9KW, 2-3/4 inch backset |
| 7 | 7-pin housing, accepts all BEST cores |
| DEL | Electrically locked (fail safe) |
| 15 | Contour angle return lever |
| K | 3 inch convex rose, no ring |
| S3 | 4-7/8 inch ANSI strike (STK is 2-3/4 inch) |
| 626 | Satin chromium plated |
| RQE | Request to exit switch |
9KW37DEU15DS3626 is a DEU, fail secure, with the 3-1/2 inch convex D rose and no RQE. 8KW37DEU4CS3626 is an 8KW in DEU with the round knob and the 3 inch convex C rose. The chart lists RQE for the 9KW only, and BEST's wiring sheet marks the 8KW as RQE not available.
RQE, LS, DS and C
BEST describes the RQE switch as normally open, closing for a moment when the inside lever or knob is turned. Wired to an alarm system, it signals to disable or sound an alarm or start a timer. On the 45HW and 47HW, LS adds latch status and DS door status, switches that BEST's terminology says monitor whether the latch is engaged or retracted and whether the door is open or closed. Separate door contacts are in our door position switch guide.
C orders BEST Quick Connect pre-wired plug-in connectors. The last page of the catalog lists the rest of that system: wire harnesses, an EPT-12C power transfer or a CECB179-12C electrified hinge, and a WH-6E extension to the power source (see our Securitron power transfer guide).
Power and the temperature control module
The catalog lists:
- 40HW: 12 volts AC or DC at 0.60 amps, or 24 volts at 0.45 amps
- 8KW and 9KW: 12 volts AC or DC at 0.50 amps, or 24 volts at 0.18 amps, with the supplied TCM
BEST requires that temperature control module on every W series lock and supplies one with each order; it reduces the current one second after energizing to lower the temperature of the trim.
For wiring, follow BEST's documents. The 40H Series Service Manual includes the 45HW and 47HW installation instructions (T81612). The 8K Series Service Manual and the 9K manual include the 8KW and 9KW wiring sheet (T56090); our BEST 9K and 45H guide links the 40H and 9K manuals.
Not a W lock: 45HM, 9KM and 9KZ
An M in place of the W marks the IDH MAX: 45HM mortise and 9KM cylindrical locks with the card reader in the escutcheon. The same catalog lists them as 12V DC locks with no TCM. A 45HM can carry the same DEU or DEL letters. The 9KZ is a keypad lock from BEST's EZ Series, powered by AA batteries, four as standard.
BEST electrified locks at The Builders Supply
Browse BEST products and our electrified and networked locks. Finish 626 is explained in our finish codes chart, BEST cores in our SFIC and LFIC guide.
Not sure which function, voltage or options your existing lock has? Our customer support team is available Monday - Friday, 8 AM - 4 PM Central Time, at 1-888-800-7789 or [email protected].
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