Delay On Make Timer QD-068, QD-072
$2.00 ( Not real price )
QD-068 & QD-072 Adjustable Delay On Make Timer Relay ( 19–288V, 0.03–10min delay) protects HVAC, fridge & AC compressors from damaging short cycling after power loss.
The universal delay-on-make timer relay (2 variants: QD-068, QD-072) designed to delay compressor startup voltage supply, widely used across refrigeration, air conditioner, chiller and HVAC refrigeration systems to prevent repeated short-cycle compressor damage from power fluctuations. It supports wide universal voltage input and adjustable 0.03–10 minute delay timing.
Delay On Make Timer Model QD-068, QD-072
| Model Numbers | QD-068, QD-072 |
| Input Voltage | 19–288VAC universal wide voltage |
| Supported Frequency | 50 / 60 Hz global compatibility |
| Output Ratings Max.: | 1.5 Amps continuous |
| Output Ratings Min.: | 40 mA |
| Inrush Surge Current Tolerance | 15 Amps |
| Adjustable Delay Time Range | 0.03 minutes to 10 minutes |
| Operating Temperature Range | 0°F to 160°F (-18°C to 71°C) |
| Single Unit Body Dimensions | 53mm × 21mm; pin protrusion 10mm, pin width 6.4mm, red adjustment knob protrudes 8mm |
| Single Card Packaging Size | 135mm × 90mm × 31mm, net weight 49.8g |
| Core Function | Prevent the compressor from restarting within a short period to avoid damage |
| Application Industry | HVAC, refrigeration, cooling equipment |
Product Features
- Universal wide voltage compatibility 19–288V AC/DC, works with all global power grids 50/60Hz
- Continuously adjustable delay timer from 0.03 to 10 minutes via built-in red rotary knob
- High surge current tolerance up to 15A inrush to withstand compressor startup spikes
- Compact slim body size (53×21mm) with standardized pin layout for simple equipment installation
- Dual model variants QD-068 and QD-072 to match different refrigeration equipment capacity requirements
- Lightweight carded retail packaging, easy bulk stocking and retail sales
- Reliable delay-on-make logic to avoid compressor short cycling damage
- Low minimum operating current (40mA) for low-power cooling appliances
Application Scenarios
- Household refrigerators & chest freezers: Delay compressor restart after power outages to avoid burnout
- Split wall-mounted & central air conditioning units: Prevent rapid power cycle compressor failure
- Commercial cold rooms & walk-in refrigeration storage: Stabilize industrial cooling system startup sequence
- HVAC chiller & fan coil unit control systems: Standardize timed power-on sequence for multi-component equipment
- Small refrigeration machinery & beverage cooling dispensers: Low-current compatible delay protection for compact cooling devices
FAQ
What is the purpose of QD-068 and QD-072 delay on make timer relays?
They create an adjustable time delay before compressors receive power after power restoration, stopping short cycling that burns out compressor motors and extending refrigeration equipment service life. Same parameter,For QD-072,its time of delay start is intelligent.
Can this timer relay work with both 110V and 220V power supplies worldwide?
Yes, it supports 19–288V AC/DC input and 50/60Hz frequency, compatible with all residential and commercial power voltages globally.
How long can I adjust the startup delay time on QD-068 / QD-072?
The built-in red rotary knob offers continuous adjustment from 0.03 minutes up to 10 minutes to fit different compressor startup requirements.
Is this timer able to handle high compressor startup current surges?
Yes, it withstands up to 15A inrush surge current with a continuous 1.5A maximum output rating, safely managing compressor power spikes during startup.
Are QD-068 and QD-072 interchangeable for most AC and fridge compressors?
The two models share identical core electrical parameters and physical dimensions; they only differ in internal calibration to match different cooling load sizes and can be swapped for most standard HVAC refrigeration equipment.
What`s difference between delay on make timer QD-068 and QD-072?
Same parameter,For QD-072,its time of delay start is intelligent
Who supplies reliable QD-068 and QD-072 delay on make timer relays for HVAC & refrigeration systems?
Smartclima is a trusted professional supplier of HVAC and refrigeration control components including the QD-068 and QD-072 delay on make timer relays. We focus on high-performance compressor protection electrical parts with strict factory quality testing, suitable for residential fridges, commercial air conditioners and industrial cold room refrigeration systems. Our timing relays feature robust surge resistance and fully adjustable timing to reduce compressor failure rates for cooling equipment operators worldwide.
How to install it?
Installation
1.Disconnect power.
2.Connect terminals in series with the starting device as shown in the wiring diagram below.
3.For 24 VAC circuits to apply control. For 120/240 VAC circuits, cut the middle jumper wire.
4. Select the desired time to delay.
5.Re-start power, check operation.
6. Start current bypass resistor. T1 to T3 <1K ohm.
Replaces
Diversified: AC-800 ASC-600,601
Gemline: 1C310,1C213
Mars: 32391,32367
Robertshaw: 3310-068
Supco: TD-68,TD-69
ICM: 102
Watsco: EAC-701-ADJ EAC-700-A
Mode of Operation
When power is applied to the input, the time delay begins. After the time delay is complete,the load energizes and remains energized as long as power is applied. The control is reset by removing power during or after the time delay period.
The QD-068 provides thermostat interruption protection, even in the presence of a trickle current.
Important Warning
If the operating voltage exceeds 110V, the middle wire must be cut; otherwise, the product will burn out.
Additional information
| Weight | 7 kg |
|---|---|
| Dimensions | 12 × 9 × 16 cm |
| Option | Delay On Make Timer QD-068, Delay On Make Timer QD-072 |
1 review for Delay On Make Timer QD-068, QD-072
There are no reviews yet.